Medical Gas Piping Spec

The Security Forces Medical Center Project

MEDICAL GAS PIPING 15482 - Page 1 of 22 PS10964-CD-SPC-ME-01 REV 0

SECTION 15482 - MEDICAL GAS PIPING

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including Conditions of Contract and Division 1 Specification Sections, apply to this Section.

1.2 SUMMARY

A. This Section includes piping and related specialties for the following medical gas systems:

1. Oxygen piping, designated "oxygen." 2. Medical compressed-air piping, designated "medical air." 3. Nitrous-oxide piping, designated "nitrous oxide." 4. Nitrogen piping, designated "nitrogen." 5. Carbon-dioxide piping, designated "carbon dioxide." 6. Medical-surgical vacuum piping, designated "medical vacuum." 7. Waste anesthetic gas disposal piping, designated "evacuation." 8. Dental compressed-air piping, designated "dental air." 9. Dental vacuum (oral evacuation) piping, designated "dental vacuum."

B. Products Supplied but Not Installed: Number and type of complete, non interchangeable service outlets indicated to manufacturer of equipment specified in other Sections requiring service outlets that will be installed by equipment manufacturer. Service outlets shall be same as outlets specified in "Service Outlets" Paragraph in Part 2.

1. Oxygen: 24 quick-connect outlets. 2. Medical Air: 24 quick-connect outlets. 3. Medical Vacuum: 48 quick-connect inlets. 4. Vacuum Slide: 48 brackets with matching quick-connect vacuum outlet cover plates. 5. Oxygen: 12 CGA V-5, DISS No. 1240 outlets. 6. Medical Air: 12 CGA V-5, DISS No. 1160 outlets. 7. Medical Vacuum: 24 CGA V-5, DISS No. 1220 inlets. 8. Vacuum Slide: 24 brackets with matching DISS vacuum outlet cover plates.

C. Products Installed but Not Supplied: Employer will supply the following products:

1. Install ceiling-mounting service units furnished by Employer.

D. Employer will furnish medical gases for Phase II testing specified in this Section.

E. Related Sections include the following:

1. Division 11 Section "Laboratory Fume Hoods" for laboratory fume hood outlets requiring medical gas services.

2. Division 12 Section "Metal Laboratory Casework" for casework and outlets requiring medical gas services.

3. Division 15 Section "Meters and Gages" for thermometers, pressure gages, and fittings.



4. Division 15 Section "Medical Air Equipment" for medical and dental air equipment and accessories.

5. Division 15 Section "Medical Vacuum Equipment" for medical and dental vacuum equipment and accessories.

1.3 DEFINITIONS

A. PTFE: Polytetrafluoroethylene.

B. PVC: Polyvinyl chloride.

C. TFE: Tetrafluoroethylene.

1.4 SUBMITTALS

A. Product Data: For the following:

1. Special-purpose valves. 2. Medical gas specialties. 3. Medical gas alarm system components. 4. Cylinder wall racks and storage racks. 5. Medical gas storage tanks.

B. Wiring diagrams for medical gas alarm systems and tanks. Differentiate between manufacturer-installed and field-installed wiring.

C. Coordination Drawings: For medical gas systems, including relationship to other services that serve same work areas.

D. Product Certificates: Signed by manufacturer certifying that copper tubing complies with NFPA 99, Paragraph 4-3.1.2.2, "Gas Piping Systems (General)."

E. Certificates of Shop Inspection and Data Report: As required by ASME Boiler and Pressure Vessel Code.

F. Inspection and Test Reports: Specified in "Field Quality Control" Article in Part 3 of this Section.

G. Certificates of Inspections and Tests From an independent testing agency, specified in "Testing Agency Services" Article in Part 3 of this Section.

H. Maintenance Data: For specialties to include in the maintenance manuals specified in Division 1.

1.5 QUALITY ASSURANCE

A. Independent Medical Gas System Testing Organization: An independent testing agency acceptable to Engineer, with the experience and capability to conduct inspection and testing services indicated, without delaying the Work, as documented according to ASTM E 699.

1. Testing agency that is financially independent of medical gas equipment manufacturer, supplier, and installer.



2. Provide names of three projects where testing of medical gases and systems has been performed by the testing agency. Include name of the project, names of such persons at that project who supervised the work for the project owner, or who accepted the report for the project owner, and written statement that projects listed required work of similar scope to that set forth in his specification.

3. Submit the testing agency's detailed procedure which will be followed in the testing of this project. Include details of the testing sequence, procedures for cross connection tests, outlet function tests, ceiling column function tests, alarm tests, purity tests, as required.

B. Certification: Provide documentation upon completion of testing to include test results, names of individuals performing work for testing agency on this project, detailed procedures followed for tests, and a certification that all results of tests were within limits specified.

C. Source Limitations: Obtain medical gas and vacuum specialties through one source from a single manufacturer.

D. Source Limitations: Provide medical gas and vacuum specialties compatible with existing systems.

E. Source Limitations: Provide medical gas and vacuum specialties from manufacturer of existing specialties, compatible with existing systems.

F. Listing and Labeling: Provide electrically operated specialties specified in this Section that are listed and labeled.

1. Terms "Listed" and "Labeled": As defined in NFPA 70, Article 100.

G. Comply with NFPA 50, "Standard for Bulk Oxygen Systems at Consumer Sites."

H. Comply with NFPA 70, "National Electrical Code."

I. Comply with NFPA 99, "Health Care Facilities."

J. Comply with NFPA 99C, "Gas and Vacuum Systems."

K. Comply with UL 498, "Attachment Plugs and Receptacles."

L. Comply with UL 544, "Medical and Dental Equipment."

1.6 DELIVERY, STORAGE, AND HANDLING

A. Deliver and store large medical gas specialties on factory-installed shipping skids, small specialties in factory-fabricated fiberboard containers, and piping with sealing plugs in ends or with other end protection.

1. Store pre-cleaned and sealed medical gas pipe, fittings, valves, and specialties with sealing plugs and sealing packaging intact.

2. Label medical gas pipe, fittings, valves, and specialties that have not been pre-cleaned, or that have been pre-cleaned but have seal or packaging that is not intact, with temporary labels indicating that cleaning is required before installation.



1.7 EXTRA MATERIALS

A. Furnish extra materials described below that match products installed, are packaged with protective covering for storage, and are identified with labels describing contents. Deliver to Employer.

1. Service Outlets: Include box, valve block, valve body, O-ring, and cover plate. Furnish quantity not less than 10 percent of amount of each installed.

2. Service-Outlet Valve Bodies: Furnish quantity not less than 10 percent of amount of each installed.

3. Service-Outlet, Valve-Body O-Ring Seals: Furnish quantity not less than 50 percent of amount of each installed.

4. Vacuum Bottle Brackets: Furnish quantity not less than 10 percent of amount of each installed.

5. Nitrogen Control Panels: Furnish quantity not less than 10 percent of amount of each installed.

6. Service Hose Assemblies: Furnish quantity not less than 10 percent of amount of each installed.

7. Shutoff Valves: Furnish quantity not less than 10 percent of amount of each type and size zone valve installed.

8. Valve Seat, Packing, and Seals: Furnish quantity not less than 10 percent of amount of each type and size installed.

9. Pressure and Vacuum Switches: Furnish quantity not less than 10 percent of amount of each type installed.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

1. Medical Gas Piping Specialties:

a. Allied Healthcare Products, Inc.; Chemtron Div. b. Allied Healthcare Products, Inc.; Oxequip Health Industries. c. MEDAES, Inc. d. Puritan-Bennett Corp.

2. Medical Gas Alarm Systems:

a. Allied Healthcare Products, Inc.; Chemtron Div. b. Allied Healthcare Products, Inc.; Oxequip Health Industries. c. MEDAES, Inc. d. Puritan-Bennett Corp.

3. Medical Gas Storage Tanks:

a. Harsco Corp.; Taylor-Wharton Gas Equipment Div. b. Minnesota Valley Engineering, Inc.



c. Process Engineering, Inc.

2.2 PIPE AND TUBES

A. Pre-cleaned, Hard Copper Tube: ASTM B 819, Type K or Type L, seamless, drawn temper, factory cleaned, purged, and sealed for medical gas service. Include marking or labeling "CLEANED FOR MEDICAL GAS SERVICE," "CLEAN FOR OXYGEN SERVICE," "NITROGENIZED." Size designated reflecting nominal inside diameter. Nitrogen piping shall be ASTM B819 Type K.

B. Pre-cleaned Soft Copper Tube: ASTM B 88M, Type A (ASTM B 88, Type K) water tube, seamless, annealed temper, factory cleaned, purged, and sealed for medical gas service according to ASTM B 819. Include marking or labeling "CLEANED FOR MEDICAL GAS SERVICE," "CLEAN FOR OXYGEN SERVICE," "NITROGENIZED."

C. Plastic Pipe: ASTM D 1785, Schedules 40 and 80, PVC plastic.

2.3 PIPE AND TUBE FITTINGS

A. Wrought-Copper Fittings: ASME B16.22, solder-joint, pressure type, factory cleaned, purged, and sealed for medical gas service according to ASTM B 819. Include marking or labeling "CLEANED FOR MEDICAL GAS SERVICE," "CLEAN FOR OXYGEN SERVICE," "NITROGENIZED."

B. Bronze-Tube Flanges: ASME B16.24, Class 300.

C. Flexible Connectors: Bronze or stainless-steel flexible pipe connectors as specified in Division 15 Section "Mechanical Vibration Controls and Seismic Restraints."

D. Plastic Pipe Fittings: ASTM D 2466, Schedule 40, PVC plastic, socket type for solvent cement joints.

E. Plastic Pipe Fittings: ASTM D 2467, Schedule 80, PVC plastic, socket type for solvent cement joints.

F. Plastic Pipe Fittings: ASTM D 2464, Schedule 80, PVC plastic, threaded type for screwed joints.

2.4 JOINING MATERIALS

A. Refer to Division 15 Section "Basic Mechanical Materials and Methods" for joining materials not in this Section.

B. Brazing Filler Metals: AWS A5.8, BCuP (copper-phosphorus) series alloys. Flux is prohibited, except when used with bronze fittings.

C. Threaded-Joint Tape: PTFE plastic.

D. PVC Plastic Solvent Cement: ASTM D 2564.

E. Gasket Material: ASME B16.21, nonmetallic, flat, asbestos free, and suitable for oxygen use.



2.5 VALVES AND VALVE BOXES

A. Ball Valves, DN80 (3-Inch NPS) and Smaller: MSS SP-110, bronze-body, full-port valve rated for 2070-kPa (300-psig) working pressure, with chrome-plated brass ball, PTFE or TFE seals, blowout-proof stem, threaded or braze-joint ends, and locking-type handle designed for quarter turn between open and closed positions.

1. Include union-type body with bolted swing-away center section. 2. Include factory-cleaned, factory-sealed for oxygen use, and factory-installed,

ASTM B 88M, Type A or B (ASTM B 88, Type K or L), copper-tube extensions with pressure gage installed downstream from valve in pressure systems and upstream from valve in vacuum systems.

B. Ball Valves, DN100 (4-Inch NPS) and Larger: MSS SP-72, bronze-body, full-port valve rated for 2070-kPa (300-psig) working pressure, with chrome-plated brass ball valve, PTFE or TFE seals, blowout-proof stem, flanged ends, and locking-type handle designed for quarter turn between open and closed positions.

C. Check Valves, DN80 (3-Inch NPS) and Smaller: Bronze-body, straight-through pattern, spring-loaded ball check valve, designed for 2070-kPa (300-psig) minimum working pressure.

D. Check Valves, DN100 (4-Inch NPS) and Larger: MSS SP-71, Class 250, iron-body, bronze-trim, swing check valve, with flanged ends.

E. Zone Valve in Cabinet: Brass or bronze body, double seal union ball valve with replaceable Teflon seat seals, teflon stem seal; 2750 kPa (400 psi) WOG, cold non-shock gas working pressure, cleaned for oxygen service blowout proof stem, one quarter turn to completely open or close. Provide tubing extensions factory brazed, pressure tested, cleaned for oxygen service. Provide 1/8 inch NPT gauge port for a 40 mm (1 ½ inch) diameter monitoring gauge downstream of the shut-off valve. Zone valves shall be products of one manufacturer, and uniform throughout in pattern, overall size and appearance. Trim with color coded plastic inserts or color coded stick-on labels. Install valves in cabinets such that cover window cannot be in place when any valve is in the closed position. Color coding for identification plates and labels is as follows:

SERVICE LABEL IDENTIFICATION COLORS MFG. STD. CLR.

OXYGEN White letters on green background

GREEN

NITROUS OXIDE White letters on blue background

BLUE

NITROGEN White letters on black background

BLACK

MEDICAL AIR Black or white letters on yellow background

YELLOW

MEDICAL VACUUM Black letters on white background

WHITE

CARBON DIOXIDE Black or white letters on gray background

GRAY



SERVICE LABEL IDENTIFICATION COLORS MFG. STD. CLR. Evacuation(Waste Gas)

White letters on purple background

PURPLE

F. Plastic Valves: PVC plastic, ball or butterfly valves with 690-kPa (100-psig) minimum working-pressure rating, but suitable for vacuum service.

G. Safety Valves: Bronze body with settings to match system requirements.

1. Pressure Safety Valves: ASME construction. 2. Vacuum Relief Valves: Equipment manufacturer's option.

H. Pressure Regulators: Brass or bronze body and trim; spring-loaded, diaphragm-operated, relieving type; manual pressure-setting adjustment; rated for 1725-kPa (250-psig) minimum inlet pressure; and capable of controlling delivered air pressure within 5.0 kPa for each 100-kPa (0.5 psig for each 10-psig) inlet pressure.

I. Automatic Drain Valves: Corrosion-resistant metal body and internal parts, 1380-kPa (200-psig) minimum working-pressure rating, capable of automatic discharge of collected condensate.

J. Zone Valve Boxes: Minimum 1.2-mm thick steel, valve boxes for recessed mounting, with holes for medical gas piping and anchors. Include for single- or multiple-valve (with pressure gage) installation and in sizes to permit manual operation of valves.

1. Interior Finish: Factory-applied white enamel. 2. Cover Plate: minimum 1.3 mm (18 gage) sheet metal with satin chromed finish,

extruded anodized aluminum, or .85 mm (22 gage) stainless steel. Provide cover window of replaceable plastic, with clear view area and gage viewing window, a corrosion resistant device or lever secured to window for emergency window removal. Permanently paint or stencil on window: "FOR EMERGENCY ONLY, SHUT-OFF VALVES FOR PIPED GASES", or equivalent wording. Configuration such that it is not possible to install window with any valve in the closed position.

3. Valve-Box Windows: Clear or tinted transparent plastic with labeling, including space for rooms served, according to NFPA 99.

4. Mount engraved rigid plastic identification plate on wall above or adjacent to cabinet. Color code identification plate to match medical gas identification colors as indicated above. Identification plate must be clearly visible at all times. Provide inscriptions on plate to read in substance: "VALVE CONTROL SUPPLY TO ROOMS".

2.6 GAGES

A. Pressure Gages: Includes gages temporarily supplied for testing purposes.

1. For line pressure use adjacent to source equipment: ANSI B40.1, pressure gage, single, size 115 mm (4-1/2 inches), for compressed air, nitrogen and oxygen, accurate to within two percent, with metal case. Range shall be two times operating pressure. Dial graduations and figures shall be black on a white background, or white on a black background. Gage shall be cleaned for oxygen use, labeled for appropriate service, and marked "USE NO OIL". Install with gagecock.

2. For all services downstream of main shutoff valve: Manufactured expressly for oxygen use but labeled for appropriate service and marked "USE NO OIL", 40 mm



(1-1/2 inch) diameter gage with dial range 1-690 kPa (1-100 psi) for oxygen, nitrous oxide and air, and 1-2050 kPa (1-300 psi) for nitrogen service.

B. Vacuum Gages:

1. For vacuum line use adjacent to source equipment: ANSI B40.1, vacuum gage, size 115 mm (4-1/2 inch), gage for air, accurate to within two percent, with metal case. Range shall be 0-100 kPa (0-30 inches Hg). Dial graduations and figures shall be black on a white background, or white on a black background. Label for vacuum service. Install with gage-cock.

2. 2. For vacuum service upstream of main shutoff valve: Provide 40 mm (1-1/2 inch) diameter gage with steel case, Bourdon tube and brass movement, dial range 0-100 kPa (0-30 inches Hg).

2.7 EMERGENCY LOW PRESSURE OXYGEN INLET

A. Emergency Oxygen Connection: Provides an inlet for connecting a temporary auxiliary source of oxygen to the oxygen pipeline system for emergency or maintenance situations per NFPA 99, low-pressure gaseous-oxygen inlet assembly, consisting of weatherproof enclosure with hinged locking cover, suitable for recessed mounting, with factory-installed DN25 or DN32 (1- or 1-1/4-inch NPS) plugged inlet, pressure gage, and minimum DN25(1-inch NPS) ball valve, for connection to oxygen system. The Emergency Oxygen Inlet is connected at a point downstream of the main supply line shutoff valve. Include brass-body safety valve, set at 520 or 550 kPa (75 or 80 psig), which may be installed in enclosure or be separate for installation in oxygen piping system. Label enclosure cover "Emergency Low-Pressure Gaseous Oxygen Inlet."

B. Check valves are provided for installation in the emergency supply line and 'in the main supply line between the main line shutoff valve and the emergency supply line connection per by NFPA 99. Check valves have a cast bronze body and straight through design for minimum pressure drop.

C. The check valves for sizes under 3" (76 mm) are soft seated, bubble tight, self aligning, spring loaded, ball type check valves. Three inch (76 mm) check valves are hard seated, spring loaded, self aligning ball type checks with cone seats (3" valves may not be "bubble tight"). Check valves are fast acting.

D. A relief valve is provided for installation in the emergency supply line per NFPA 99. The relief valve has a brass body, single seat design, and is cleaned for oxygen use. It automatically reseats to provide a "bubble tight" seal after discharging excess gas. Pre-set at 75 psi.

2.8 BIO-HAZARD SAFETY STATEMENT

A. Provide at mechanical rooms where medical vacuum pumps are installed the following safety statement:

1. “BIOHAZARD CAUTION: Fluid and waste materials inside vacuum pipelines and vacuum equipment may be contaminated with blood and other potentially infectious material. Construction and service personnel should use PERSONAL PROTECTIVE EQUIPMENT and practice UNIVERSAL PRECAUTIONS when opening or servicing vacuum systems”.



2.9 MEDICAL GAS MANIFOLDS

A. Comply with NFPA 99, Chapter 4, "Cylinder Systems without Reserve Supply," with the following features:

1. Central Control Panel Unit: Weatherproof cabinet, supply and delivery pressure gages, electrical alarm system connections and transformer, indicator lights or devices, manifold connection, pressure changeover switch, line-pressure regulator, shutoff valves, and safety valve.

2. Manifold and Headers: Duplex, nonferrous metal header for number of cylinders indicated, divided into 2 equal banks. Units include design for 13.8-MPa (2000-psig)minimum inlet pressure, except nitrous-oxide manifolds may be designed for 5500 kPa (800 psig) and carbon-dioxide manifolds may be designed for 10.35 MPa (1500 psig). Include cylinder bank headers with inlet (pigtail) connections complying with CGA V-1, individual inlet check valves, shutoff valve, pressure regulator, check valve, and pressure gage.

3. Operation: Automatic, pressure-switch-activated changeover from one cylinder bank to other cylinder bank when first bank becomes exhausted, without line-pressure fluctuation or resetting of regulators, and without supply interruption by shutoff of either cylinder bank header.

4. Mounting: Wall mounting, complete with mounting brackets for manifold control cabinet and headers.

5. Mounting: Floor mounting, complete with support legs for manifold control cabinet. 6. Label manifold control unit with permanent label identifying medical gas type and

system operating pressure. 7. Nitrous-Oxide Manifolds: at 380-kPa (55-psig) line pressure with electric heater or

orifice design that will prevent freezing during high demand. 8. Nitrogen Manifolds: at 1240-kPa (180-psig) line pressure. 9. Oxygen Manifolds: at 380-kPa (55-psig) line pressure. 10. Medical Air Manifolds: at 380-kPa (55-psig) line pressure.

B. Service Hose Assemblies: Color coded, conductive, neoprene, 6.4- or 7.9-mm (1/4- or 5/16-inch) ID, of lengths indicated, and with indexed or DISS-type end-connection fittings suitable for medical gas service indicated.

1. Hose Color: Black, when medical gas service is indicated. 2. Oxygen Hose Assemblies: 2400 mm long, with quick-connect oxygen fittings, valve

on one end and stem on other end. 3. Nitrogen Hose Assemblies: 3.6 m long, with nitrogen CGA V-5, DISS No. 1120

fittings, nut on one end and male plug on other end.

C. Pressure Control Panels: Steel box and steel support brackets for recessed roughing-in. Include stainless-steel cover plate with printed operating instructions. Include control panels with manifold assembly consisting of inlet supply valve, inlet supply pressure gage, line-pressure control regulator, outlet supply pressure gage, DISS service outlet, and piping outlet for remote service outlet.

1. Minimum Working Pressure: 1240 kPa (180 psig).2. Line-Pressure Control Regulator: Self-relieving, diaphragm type, and with precision

manual adjustment. 3. Pressure Gages: 0- to 2070-kPa (0- to 300-psig) range. 4. Provide temporary dust shield and U-tube for testing for use before final assembly. 5. Air Control Panels: Label cover plate "Air Pressure Control." Include CGA V-5,

DISS No. 1160 air service outlet.



2.10 NITROGEN CONTROL PANEL (NCP)

A. General: For nitrogen service, consisting of a line pressure control regulator, outlet line pressure gage, DISS service outlet, and supply valve, assembled and rigidly mounted in a roughing-in assembly, and provided with a metal cover plate. Panel shall be designed to deliver 10 L/s (20 SCFM) at 1535 kpa (223 psi). Unit may be recessed wall mounted or integral with the articulating arm or column with individual regulators for each outlet

B. Manifold Assembly: Mounted to a steel support bracket, factory assembled and tested, ready for installation in the roughing-in assembly.

1. Supply valve, bronze bodied, double seal, full flow, ball type, designed for working pressure in excess of 1700 kPa (300) psi, with chrome plated brass ball which seals in both directions, requiring only a quarter turn of the knob from open to closed position.

2. Line pressure control regulator, self-relieving, diaphragm type, with high-flow precision adjustment and working pressure in excess of 1700 kPa (250 psi).

3. Line pressure gage, to monitor the gas outlet line pressure, calibrated from 0 to 2000 kPa (300 psi) in increments of 100 kPa (10 psi).

4. Nitrogen service outlet, DISS type as specified under Article, STATION OUTLETS AND INLETS, with a self-sealing dust plug, having a working pressure of 1700 kPa (250 psi) maximum.

5. Two 146 mm (5-3/4 inch) lengths of 10 mm (3/8-inch) outside diameter type "K" copper tubing for connection to gas service supply line and to remote outlet line.

C. Roughing-In Assembly: Designed for recessed installation, consisting of a prime painted steel fabricated backbox with mounting flanges on all four sides, with provisions to securely anchor the backbox to wall construction. Equip with a crossover "U" tube to facilitate testing of the nitrogen system prior to the manifold installation, and a plaster shield to prevent dust or other foreign matter from contaminating internal parts prior to final assembly.

D. Coverplate Assembly: Chromed cast metal or NAAMM Number 4 satin finished stainless steel panel with provisions for line pressure gage(s), nitrogen outlet, regulator and supply valve knobs, attaching directly to the roughing-in assembly by means of four Number 6 - 32 by 40 mm (1-1/2 inch) long mounting screws, with plaster adjustments up to 20 mm (3/4 inch).

2.11 PRESSURE AND VACUUM SWITCHES

A. General purpose, contact or mercury type, allowing both high and low pressure set points, with contact type provided with a protective dust cover; adjustable range set by inside or outside adjustment; switches activate when indicated by alarm requirements. Use one orifice nipple (or DISS demand check valve) for each sensor of pressure switch.

2.12 MEDICAL GAS ALARM SYSTEMS

A. Description: Compatible alarm panels, remote sensing devices, and other related components where indicated and where required by NFPA 99. Power wiring is specified in Division 16 Sections.



B. Components: Designed for continuous service and to operate on power supplied from 220-V, ac power source to alarm panels and with connections for 24- or 12-V, ac low-voltage wiring to remote sensing devices. Include step-down transformers if required.

C. Dew-Point Monitors: Continuous line monitoring, having panel with gage or digital display, pipeline sensing element, electrical connections for alarm system, factory- or field-installed valved bypass, and visual and cancelable audio signal for dryer site and master alarm panels. Operate alarm when pressure dew point rises above 3.9 deg C (39 deg F) at 380 kPa (55 psig).

1. Operation: Chilled-mirror method. 2. Operation: Hygrometer moisture analyzer with sensor probe.

D. Pressure and Vacuum Switches or Pressure Transducer Sensors: Continuous line monitoring with electrical connections for alarm system.

1. Low-Pressure Switches: 0- to 690-kPa (0- to 100-psig) operating range. 2. High-Pressure Switches: Up to 1725-kPa (250-psig) operating range. 3. Vacuum Switches: 0- to 101-kPa vacuum (0- to 30-in. Hg) range.

E. Carbon-Monoxide Monitors: Panel with gage or digital display, pipeline sensing element, electrical connections for alarm system, and factory- or field-installed valved bypass. Operate alarm when carbon-monoxide level rises above 10 ppm.

F. Alarm Panels: Factory wired with audible and color-coded visible signals to indicate specified functions.

1. Mounting: Exposed, surface-mounting installation. 2. Mounting: Recessed installation. 3. Enclosures: Fabricated from minimum 1.2-mm thick steel or minimum 1.5-mm thick

aluminum, and with knockouts for electrical and piping connections.

G. Special Features: :

H. Master Alarm Panels: In addition to manufacturer's standard features, include the following features. Separate trouble alarm signals, pressure (vacuum) gages, and indicators for oxygen, medical air, medical vacuum, nitrous oxide, nitrogen, evacuation, carbon dioxide, and high-pressure air. Include signal alarms at master alarm panels when the following conditions exist:

1. Oxygen Alarms

a. Liquid oxygen low level alarm: Functions when stored liquid oxygen reaches a predetermined minimum level.

b. Reserve switchover alarm: Functions when reserve oxygen supply goes in operation.

c. Reserve low supply alarm: Functions when contents of cylinder reserve oxygen supply are reduced to one day's average supply; switch and contacts at the bulk tank control panel.

d. Reserve low pressure alarm: Functions when the gas pressure available in the liquid reserve oxygen supply is reduced below the pressure required to function properly.

e. Low pressure alarm: Functions when system pressure downstream of the main shutoff valve drops below 275 kPa (40 psi), plus/minus 14 kPa (two psi); operated by pressure switch or transmitters.



f. High pressure alarm: functions when system pressure downstream of main shutoff valve increases above 415 kPa (60 psi), plus/minus 14 kPa (two psi) set points; operated by pressure switches or transmitters.

2. Medical Air:

a. Back-up air compressor is in operation b. Carbon Monoxide Alarm: Functions when carbon-monoxide level rises above

10 ppm, c. Dew point alarm: Functions when dew point rises above 4 degrees C (39

degrees F) at 380 kPa (55 psi). Receives signal from dew point monitor. d. Main Bank Filter Sets Alarm: Functions when pressure drop across the filter

set increases more than 14 kPa (two psi) over that when filters are clean and new; operates by differential pressure switch.

e. Desiccant Prefilter Alarm: Functions when pressure across the filter increases more than 21 kPa (three psi) over that when filters are clean and new; operates by pressure differential switch.

f. Desiccant Post Filter Alarm: Functions when pressure drop across filter increases more than 21 kPa (three psi) over that when filters are clean and new; operates by pressure differential switch.

g. Desiccant Dryer Malfunction Alarm: Functions on any combination of failure of tower cycling and/or pressure dew point rise above 60 degrees C at 690 kPa (140 degrees F at 100 psi).

h. Refrigerated Air Dryer Filter Alarm: Functions when pressure drop across filter increases more than 21 kPa (three psi)

i. Aftercooler High temperature Alarm: Functions when aftercooler discharge air temperature exceeds 38 degrees C (100 degrees F).

j. Pressure Alarms: Functions when system pressure downstream of main shutoff valve drops below 275 kPa (40 psi), plus/minus 14 kPa (two psi) or increases above 450 kPa (60 psi), plus/minus 14 kPa (two psi) set points; operated by pressure switches or transmitters.

k. Compressor Malfunction Alarm: Functions when compressor system control panel signals compressor high temperature malfunction; lead compressor fails to start or lag compressor in use; high water in receiver and high water level in separator (if so required). Receives signal from compressor system control panel.

3. Vacuum alarms:

a. Low vacuum alarm: Functions when system vacuum upstream of main shutoff valve drops below 40 kPa (12-inches Hg); operated by vacuum switch.

b. Filter differential pressure/backpressure alarm: Functions when discharge oil filter differential rises to set level, or when backpressure is sensed; receives signal from pump control panel.

c. Medical vacuum pump malfunction.

4. Nitrous Oxide alarms:

a. Liquid level is low b. Pressure downstream from main shutoff valve drops below 275 kPa (40 psig)

or rises above 415 kPa (60 psig)c. Changeover is made to reserve d. Reserve is in use e. Reserve level is low.



5. Nitrogen alarms:

a. Pressure drops below 1100 kPa (160 psig) or rises above 1380 kPa (200 psig)b. Changeover is made to alternate bank. c. Evacuation: Vacuum drops below 40 kPa (12 in. Hg).d. Carbon Dioxide: Pressure drops below 275 kPa (40 psig) or rises above

415 kPa (60 psig), and changeover is made to alternate bank. e. High-Pressure Air: Pressure drops below 1100 kPa (160 psig) or rises above

1380 kPa (200 psig).

6. Area Alarm Panels: Separate trouble alarm signals; pressure and vacuum gages; and indicators for oxygen, medical air, and medical vacuum.

a. Oxygen, nitrous oxide, carbon dioxide and compressed air alarms: Pressure alarms: Functions when pressure in branch drops below 275 kPa (40 psi), plus/minus 14 kPa (two psi) or increases above 235 kPa (60 psi), plus/minus 14 kPa (two psi) set points; operated by pressure switches or transmitters.

b. Nitrogen alarms: Pressure alarms: Functions when pressure in branch drops below 1310 kPa (190 psi), plus/minus 14 kPa (two psi) or increases above 1500 kPa (220 psi), plus/minus two psi) set points; operated by pressure switches or transmitters.

c. Vacuum alarms: Low vacuum alarm: Functions when vacuum in branch drops below 40 kPa (12-inches) Hg; operated by vacuum switch.

7. Anesthetizing-Area Alarm Panels: Separate trouble alarm signals; pressure and vacuum gages; and indicators for oxygen, medical air, medical vacuum, nitrous oxide, nitrogen, evacuation, carbon dioxide, and high-pressure air.

8. Signal alarms at area alarm panels and at anesthetizing-area alarm panels when the following conditions exist:

a. Oxygen: Pressure drops below 275 kPa (40 psig) or rises above 415 kPa (60psig).

b. Medical Air: Pressure drops below 275 kPa (40 psig) or rises above 415 kPa (60 psig).

c. Medical Vacuum: Vacuum drops below 40 kPa (12 in. Hg).d. Nitrous Oxide: Pressure drops below 275 kPa (40 psig) or rises above 415 kPa

(60 psig).e. Nitrogen: Pressure drops below 1100 kPa (160 psig) or rises above 1380 kPa

(200 psig).f. Evacuation: Vacuum drops below 40 kPa (12 in. Hg).g. Carbon Dioxide: Pressure drops below 275 kPa (40 psig) or rises above

415 kPa (60 psig).h. High-Pressure Air: Pressure drops below 1100 kPa (160 psig) or rises above

1380 kPa (200 psig).

9. Local Alarm Functions: Provide individual local air compressor and vacuum pump malfunction alarms at associated main control panels.

a. Compressor Malfunction Alarm: Compressor system receives the following individual signals and sends a single consolidated "compressor malfunction alarm" signal to master alarm panel.

1) High Temperature Shutdown Alarm: Functions when discharge air temperature exceeds 177 degrees C (350 degrees F), shutting down affected compressor.



2) Lead Compressor Fails to Start Alarm: Functions when lead compressor fails to start when actuated causing lag compressor to start.

3) Lag Compressor in Use Alarm: Functions when lag compressor starts. 4) High Water Level in Receiver. (Liquid ring unit) 5) High Water Level in Separator (if so required). (Liquid ring unit)

b. Desiccant Air Dryer Malfunction Alarm: Dryer receives the following individual signals and sends a single consolidated dryer malfunction alarm signal to master alarm panel.

1) Dew Point Alarm: Functions when pressure dew point rises above 4 degrees C (39 degrees F) at 380 kPa (55 psi).

c. Vacuum Pump Malfunction Alarm: Pump system receives the following individual signals and sends a single consolidated pump malfunction alarm signal to master alarm.

1) High Temperature Shut down Alarm: Functions when exhaust air temperature exceeds 104 degrees C (220 degrees F)., shutting down affected pump.

2) Lead Pump Fails to Start Alarm: Functions when lead pump fails to start when actuated causing lag pump to start.

3) Lag Pump in Use Alarm: Functions when lag pump starts.

I. Computer Interface Cabinet: Wall-mounting, welded-steel, control cabinet with gasketed door, mounting brackets, grounding device, and white-enamel finish. Include factory-installed signal circuit boards, power transformer, circuit breaker, wiring terminal board, and internal wiring capable of interfacing 20 alarm signals.

2.13 DENTAL GAS ALARM SYSTEMS

A. Description: Compatible alarm panel, remote sensing devices, and other related components where indicated and where required by NFPA 99. Power wiring is specified in Division 16 Sections.

B. Components: Designed for continuous service and to operate on power supplied from 220-V, ac power source to alarm panels and with connections for 24-V, ac low-voltage wiring to remote sensing devices. Include step-down transformers if required.

C. Dew-Point Monitors: Continuous line monitoring, having panel with gage or digital display, pipeline sensing element, electrical connections for alarm system, factory- or field-installed valved bypass, and visual and cancelable audio signal for dryer site and alarm panels. Operate alarm when pressure dew point rises above 10 deg C (50 deg F) at 860 kPa (125 psig).

1. Operation: Chilled-mirror method. 2. Operation: Hygrometer moisture analyzer with sensor probe.

D. Pressure and Vacuum Switches or Pressure Transducer Sensors: Continuous line monitoring with electrical connections for alarm system.

1. Low-Pressure Switches: 0- to 690-kPa (0- to 100-psig) operating range. 2. High-Pressure Switches: Up to 1725-kPa (250-psig) operating range. 3. Vacuum Switches: 0- to 101-kPa vacuum (0- to 30-in. Hg) range.



E. Carbon-Monoxide Monitor: Panel with gage or digital display, pipeline sensing element, electrical connections for alarm system, and factory- or field-installed valve bypass. Operate alarm when carbon-monoxide level rises above 10 ppm.

F. Alarm Panels: Factory wired with audible and color-coded visible signals to indicate specified functions.

1. Mounting: Recessed installation. 2. Mounting: Exposed, surface-mounting installation. 3. Enclosures: Fabricated from minimum 1.2-mm thick steel or minimum 1.5-mm thick

aluminum, and with knockouts for electrical and piping connections. 4. Features: In addition to manufacturer's standard features, include trouble alarm

signals, pressure and vacuum gages, and indicators for dental compressed air and dental vacuum. Include signal alarms at alarm panels when the following conditions exist:

a. Dental Air: Pressure drops below 760 kPa (110 psig) or rises above 965 kPa (140 psig), back-up air compressor is in operation, pressure drop across filter assembly increases more than 13.8 kPa (2 psig), dew point rises above 10deg C (50 deg F) at 860 kPa (125 psig), and carbon-monoxide level rises above 10 ppm.

b. Dental Vacuum: Vacuum drops below 20 kPa (6 in. Hg) and back-up vacuum pump is in operation.

G. Computer Interface Cabinet: Wall-mounting, welded-steel, control cabinet with gasketed door, mounting brackets, grounding device, and white-enamel finish. Include factory-installed signal circuit boards, power transformer, circuit breaker, wiring terminal board, and internal wiring capable of interfacing 20 alarm signals.

2.14 CYLINDER WALL AND STORAGE RACKS

A. Medical Gas Cylinder Wall Racks: Fabricate as indicated or provide equivalent manufactured wall racks.

B. Medical Gas Cylinder Storage Racks: Fabricate as indicated or provide equivalent manufactured storage racks.

2.15 MEDICAL GAS STORAGE TANKS

A. Bulk Gas Systems: Bulk storage tank with connections for alarm system, continuous supply, and reserve supply that will operate only during emergencies, complying with NFPA 99, "Health Care Facilities."

B. Controls: Include actuating switch for alarm system connection and means for automatic actuating of reserve supply.

C. Bulk Gas Storage Tanks: Vertical mounting, double-wall construction with inner vessel fabricated according to ASME Boiler and Pressure Vessel Code, Section VIII, "Pressure Vessels," for unfired pressure vessels, and suitable for medical gas service. Include insulation and vacuum seal between walls. Fabricate outer shell from carbon steel with factory-applied manufacturer's standard protective paint finish suitable for exterior installation. Include the following features, specialties, and components:



1. Safety Valves: ASME construction with pressure setting to correspond to tank working pressure.

2. Relief Valves: ASME construction with pressure setting as required for component or system being protected.

3. Pressure Gages: For tank pressure and facility service line pressure. 4. Contents Gage: High- and low-level indicator with electric signal circuit connection. 5. Drain Valves: For piping, inner vessel, and outer shell. 6. Fill Assembly: Fill connection, piping, valves, relief devices, and controls. 7. Facility Service Assembly: Piping, valves, relief devices, vaporizer, shutoff valve,

pressure regulator, line shutoff valve or check valve, and reserve supply connection for connection to building service piping.

8. Include permanent label showing medical gas type, storage tank capacity, tank pressure rating, vaporizer capacity, and operating instructions.

9. Capacity of Storage Tanks and Vaporizers: As indicated. 10. Liquid Oxygen Storage Tank: Nickel-steel or stainless-steel inner vessel with 1725-

kPa (250-psig) minimum working pressure. Include electric, steam, or ambient vaporizer as indicated.

11. Liquid Nitrous-Oxide Storage Tank: Steel-alloy inner vessel with 2070-kPa (300-psig) minimum working pressure. Include electric or steam vaporizer as indicated.

D. Oxygen Reserve Supply: Manifolded header for high-pressure cylinders, fabricated of copper-tube or brass pipe and fittings, and suitable for pressures up to 27.6 MPa (4000psig). Header shall have inlet connections complying with CGA V-1, with individual inlet check valves, header shutoff valve, header pressure regulator, line shutoff valve or check valve, pressure gage, and inlet connections for number of cylinders indicated.

E. Nitrous-Oxide Reserve Supply: Manifolded header for high-pressure cylinders, fabricated of copper-tube or brass pipe and fittings, and suitable for pressures up to 27.6 MPa (4000 psig). Header shall have inlet connections complying with CGA V-1, with individual inlet check valves, header shutoff valve, header pressure regulator, line shutoff valve or check valve, pressure gage, and inlet connections for number of cylinders indicated. Include electric heater.

2.16 IDENTIFICATION

A. Refer to Division 15 Section "Mechanical Identification" for piping, valves, gages, alarms, accessories, and labels for bulk storage tanks.

PART 3 - EXECUTION

3.1 PREPARATION

A. General: When the Engineer does not accept pre-cleaned pipes because of exposure, all pipes must be replaced by new pipes. If accepted by the Engineer perform the following procedures to re-clean the pipes:

1. Clean medical gas pipe and pipe fittings, valves, gages, and other components of oil, grease, and other readily oxidizable materials as required for oxygen service, according to CGA G-4.1, "Cleaning Equipment for Oxygen Service."

2. Wash medical gas piping and components in hot, alkaline cleaner-water solution of sodium carbonate or trisodium phosphate in proportion of 0.45 kg (1 lb) of chemical to 11.3 L (3 gal.) of water.



a. Scrub to ensure complete cleaning. b. Rinse with clean, hot water after washing to remove cleaning solution.

3.2 CONCRETE BASES

A. Construct concrete bases of dimensions indicated, or otherwise required, but not less than 100 mm larger in both directions than supported unit and not less than 100 mm high.

B. Refer to Division 3 Section "Cast-in-Place Concrete."

3.3 PIPING APPLICATIONS

A. General: Refer to Part 2 of this Section for the following materials:

1. Interior, Medical Gas Piping: Use pre-cleaned, hard copper tube with wrought-copper fittings and brazed joints.

2. Exterior, Buried Medical Gas Piping: Use soft copper tube with wrought-copper fittings and brazed joints.

3. Dental Vacuum (Oral Evacuation) Piping: Use Schedule 40 PVC plastic pipe, Schedule 40 PVC plastic socket-type pipe fittings, and solvent cement joints.

4. Dental Vacuum (Oral Evacuation) Piping: Use Schedule 80 PVC plastic pipe, Schedule 80 PVC plastic socket-type pipe fittings, and solvent cement joints.

5. Dental Vacuum (Oral Evacuation) Piping: Use Schedule 80 PVC plastic pipe, Schedule 80 PVC plastic threaded pipe fittings, and threaded joints.

6. Underground, Protective Conduit: Use Schedule 80 PVC plastic pipe, Schedule 80 PVC plastic threaded pipe fittings, and threaded joints; or Schedule 80 PVC plastic socket-type pipe fittings, and solvent cement joints.

3.4 SERVICE ENTRANCES

A. Extend piping and connect to bulk storage tanks and exterior manifolds, of sizes and in locations indicated for service entrances to building.

B. Install sleeve and mechanical sleeve seal at penetrations through foundation wall for watertight installation.

3.5 PIPING INSTALLATION, GENERAL

A. Refer to Division 15 Section "Basic Mechanical Materials and Methods" for basic piping installation.

B. Install supports and anchors according to Division 15 Section "Hangers and Supports."

1. Spacing between Hangers: As described in NFPA 99 and NFPA 99C.

C. Install emergency oxygen connection assembly with pressure relief valve and full-size discharge piping to outside, with check valve downstream from pressure relief valve, and with ball valve and check valve in supply main from bulk oxygen storage tank.

D. Valve Applications: Use ball valves specified in this Section for main shutoff and zone valve duties.



E. Install zone valves in valve box anchored to structure. Install valves at angle that prevents closure of cover when valve is in closed position. Single boxes may be used for multiple valves that serve same area or function.

F. Install thermometers and pressure gages according to Division 15 Section "Meters and Gages."

G. Install exterior, buried medical gas piping in protective conduit fabricated with PVC pipe and fittings. Do not extend conduit through foundation wall.

H. Purging: Purge medical gas piping using oil-free, dry nitrogen after installing piping but before connecting to service-outlet valves, alarms, and gages.

3.6 JOINT CONSTRUCTION

A. Refer to Division 15 Section "Basic Mechanical Materials and Methods" for basic piping joint construction.

3.7 SPECIALTIES INSTALLATION

A. Install specialties according to NFPA 99 and manufacturer's written instructions.

B. Install manifolds firmly anchored to substrate and with seismic controls as indicated.

C. Install ceiling-mounting service units firmly anchored to substrate according to manufacturer's written instructions. Provide structural steel, hanger rods, anchors, and fasteners, in addition to components furnished with specialties necessary to fabricate supports.

3.8 MEDICAL GAS ALARM SYSTEM INSTALLATION

A. General: Install alarm system components according to NFPA 99 and manufacturer's written instructions.

B. Install alarm panels in locations indicated.

3.9 BULK GAS STORAGE TANK INSTALLATION

A. Install gas storage tanks and reserve supply tanks on concrete bases. Set tanks and connect medical gas piping to tanks according to NFPA 50, NFPA 99, and manufacturers' written instructions.

B. Install gas storage tanks plumb and level, firmly anchored, in locations indicated, and maintain NFPA 50 and tank manufacturer's recommended clearances. Orient so controls and devices that need servicing are accessible.

C. Install gas storage tanks firmly anchored and with seismic controls as indicated.

3.10 CONNECTIONS

A. Install piping next to equipment to allow service and maintenance.



B. Connect medical gas piping to bulk storage tanks with unions. Install with ball valves and strainers where required.

C. Connect medical gas piping to equipment, gas manifolds, and accessories with unions. Install with ball valves and strainers.

1. Install flexible pipe connectors on air piping connections to air compressors, vacuum piping connections to vacuum units, and where indicated.

2. Install thermometers on air-compressor discharge piping, air receiver tanks, vacuum receiver tanks, and where indicated.

3. Install pressure gages on air-compressor discharge piping, air receiver tanks, vacuum receiver tanks, and where indicated.

4. Install pressure regulators downstream from air compressors, dryers, purification units, and filter assemblies.

D. Connect water piping to water-cooled units with union and reduced-pressure-zone-type backflow-preventer assembly having strainer, gate valves, and air-gap fitting for indirect waste. Connect cooler unit drains with union and ball valves, and discharge over closest floor drain.

1. Where water piping connections are of dissimilar metals, make connections with dielectric fittings or dielectric unions.

E. Install safety valves on bulk gas storage tanks.

F. Install medical gas piping and electrical connections to medical gas alarm system components.

G. Arrange for electric-power connections to specialties and devices that require power. Electric power, wiring, and disconnect switches are specified in Division 16 Sections.

3.11 LABELING AND IDENTIFICATION

A. Install labeling on valves, valve-box covers, and alarm panels according to requirements of NFPA 99.

B. Refer to Division 15 Section "Mechanical Identification" for labeling and identification materials.

C. Captions and Color Coding: Use the following or similar medical gas captions and color coding for specialties, when specified and where required by NFPA 99:

1. Oxygen: White letters on green background. 2. Medical Air: Black or white letters on yellow background. 3. Medical Vacuum: Black letters on white background. 4. Nitrous Oxide: White letters on blue background. 5. Nitrogen: White letters on black background. 6. Evacuation: Black letters on white background or white letters on purple

background. 7. Carbon Dioxide: White letters on gray background.

D. Label medical gas systems operating at other than standard pressure with system operating pressure.



E. Install continuous underground warning tape during backfilling of trench for underground medical gas piping.

F. Refer to Division 2 Section "Earthwork" for warning tapes.

3.12 FIELD QUALITY CONTROL

A. Medical Gas and Vacuum Piping Tests: Perform the following:

1. System Clearing: Purge medical gas and vacuum piping using oil-free, dry nitrogen after installing piping but before installing service outlets, alarms, and gages.

2. Pressure Test: Subject each piping section of each system, except high-pressure air and nitrogen, to test pressure of from 1035 to 1380 kPa (150 to 200 psig) and high-pressure air and nitrogen systems to test pressure of 1725 kPa (250 psig) with oil-free, dry nitrogen before attaching system components, after installing station outlets with test caps (when supplied) in place, and before concealing piping system. Maintain test until joints are examined for leaks by means of soapy water.

3. Standing-Pressure Test: Install assembled system components after testing individual systems as specified above. Subject systems to 24-hour standing-pressure test at 20 percent above normal line pressure, but not less than 455 kPa (66 psig).

a. Option: Subject vacuum and evacuation systems to 40- to 61-kPa (12- to 18-in. Hg) minimum vacuum instead of pressure test.

4. Repair leaks and replace defective or damaged components with new materials, and retest system until satisfactory results are obtained.

5. Report test results in writing to Engineer.

3.13 TESTING AGENCY SERVICES

A. Description: Engage the services of an independent testing agency complying with requirements of Division 1 Section "Quality Control" to inspect, test, and certify medical gas systems as specified below. Inspect, test, and certify complete medical gas systems according to requirements of NFPA 99, "Health Care Facilities." Inspect, test, and certify each medical gas system, including each piping system, outlets and inlets, accessories, alarm panels and devices, safety devices, medical gas sources, and equipment.

1. Bulk Oxygen Systems: Comply with NFPA 50, "Standard for Bulk Oxygen Systems at Consumer Sites."

B. Provide oil-free, dry nitrogen; materials; equipment; and labor required for testing.

C. Provide medical gases required for testing systems.

D. Prepare written reports of tests results, including corrective action.

E. Certify that medical gas systems comply with requirements specified, that tests were properly performed, and that test results were satisfactory.

F. Inspect outlets and inlets, gages, alarms, and zone valves for proper labeling for gas service and function.

G. Inspect manifold supply systems for installation and operation as required by NFPA 99, Chapter 4, "Gas and Vacuum Systems."



H. Inspect bulk oxygen supply systems for installation and operation as required by NFPA 50.

I. Inspect bulk nitrous-oxide supply systems for installation and operation as required by CGA G-8.1.

J. Phase I Tests: Perform the following tests using oil-free, dry nitrogen after installing gas systems but before connecting new systems to existing gas sources:

1. Outlet and Inlet Cross-Connection Test: Pressurize one medical gas system to 345 kPa (50 psig), with other systems at atmospheric pressure, and access each outlet with appropriate adapter and test gage. Repeat procedure for each system.

2. Outlet and Inlet Cross-Connection Test: Pressurize each system in 69-kPa (10-psig)increments and access each outlet with appropriate adapter and test gage.

3. Alarm System Test: Test for operation of functions specified in "Medical Gas Alarm Systems" Article within limits required.

4. Pressure Test: Test systems at operational pressure with system components installed. No leaks are allowed. Conduct tests by zone.

5. Particulate Sampling: Test positive-pressure terminal outlets, using 0.45-micron filter, for evidence of solid particulate contamination. Allowable limit is 2 mg/cu. m.

6. Moisture: Test positive-pressure terminal outlets for dew point to verify absence of moisture in piping. Dew point of gas dispensed from terminal outlets shall not exceed dew point of source test gas by more than 2.2 deg C (4 deg F).

7. System Purity: Test terminal outlets and gas source for contaminant levels as defined below. Excessive contaminant levels will require additional purging to outlets within specific zone until levels are within the following limits:

a. Total Hydrocarbons as Methane: One ppm. b. Halogenated Hydrocarbons: 2 ppm. c. Carbon Monoxide: 2 ppm.

8. Air-Compressor Purity: Collect medical air-compressor air samples taken from downstream side of filters and air dryers. Test samples for contaminants and moisture within the following limits:

a. Total Hydrocarbons as Methane: 25 ppm. b. Halogenated Hydrocarbons: 5 ppm. c. Carbon Monoxide: 10 ppm. d. Moisture, Dew Point: Plus 4.4 deg C (40 deg F) at dryer discharge.

K. Phase II Tests: After Phase I testing has been completed, test completed medical gas systems using applicable medical gas for each system. Completed systems have outlets and inlets, alarms, and gages installed; and gas supply systems are installed and ready for operation.

1. Final Purging: Introduce applicable medical gas for each system into respective piping systems. Purge installed outlet valves to remove nitrogen test gas present from Phase I testing. Test vacuum inlets for ability to flow.

2. Outflow Analysis: Analyze medical gas at positive-pressure outlets to confirm delivery of proper medical gas at proper concentration level. Minimum allowable concentration levels are defined by U.S. Pharmacopeia's USP-NF and the following CGA Commodity Specifications:

a. CGA G-4.3, "Commodity Specification for Oxygen." b. CGA G-6.2, "Commodity Specification for Carbon Dioxide." c. CGA G-7.1, "Commodity Specification for Air."



d. CGA G-8.2, "Commodity Specification for Nitrous Oxide." e. CGA G-10.1, "Commodity Specification for Nitrogen."

3. System Delivery Pressures: Test pressure piping systems to confirm supply sources are set to deliver gas at the following nominal pressure levels:

a. All Systems, except Nitrogen and High-Pressure Air: 345 to 380 kPa (50 to 55 psig) at maximum flow.

b. Nitrogen and High-Pressure Air: 1240 kPa (180 psig) minimum at maximum flow.

4. System Suction Levels: Test vacuum and evacuation piping systems to confirm that vacuum producers are set to maintain suction of not less than 40 kPa (12 in. Hg) at most distant inlets.

L. Certification: Certify that specified inspection, tests, and procedures have been performed and report results. Include the following:

1. Inspections performed. 2. Procedures, materials, and gases used. 3. Test methods used. 4. Results of tests.

3.14 COMMISSIONING

A. Startup Services: Engage a factory-authorized service representative to inspect alarm system installation and to provide startup service.

1. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment discovered by service representative.

B. Perform the following final checks before startup:

1. Verify that specified tests of piping are complete. 2. Check safety valves for correct settings. Ensure settings are greater than air-

compressor discharge pressure, but not greater than rating of system components.

3.15 DEMONSTRATION

A.

B. Engage a factory-authorized service representative to train Employer's maintenance personnel in procedures for alarm system startup and shutdown, and to adjust, operate, and maintain medical gas piping systems. Refer to Division 1 Section "Demonstration and Training and Closeout Procedures."

C. Schedule at least four (4) hours of training.

END OF SECTION 15482

Documents

Medical Gas Piping Spec