15060

PIPE & PIPE FITTINGS

15060APRIL, 1995 PAGE 1 OF 5

PIPE AND PIPE FITTINGS

General

In general, follow the guidelines below when designing and specifying pipe, pipe fittings, andaccessories. Unless specifically indicated otherwise, these guidelines are not intended to restrict orreplace professional judgment.

Related Sections

Refer to Tab “2 - Sitework” for additional Civil requirementsRefer to Section “15250 - Mechanical Insulation” for piping insulation requirements

General Pipe Material Requirements

Eccentric Fittings

Shall be used where piping sizes reduce on horizontal runs. Reducing fittings shall be couplings; nobushing will be allowed.

Tees in Welded Pipe

Saddle and nipple type tees are permitted in welded pipe if made with Weld-O-Lets or Thread-O-Lets and branch size does not exceed 1/2 the size of the main size. All branches in excess of 1/2 ofmain size shall be made using welding tees.

Solder in Copper Piping Joints

Solder for all piping shall be “lead-free”. 50/50 solder is not permitted.

Dielectric Protection

Where dissimilar piping materials (steel and copper) are connected, install a threaded brass nipplefor pipe sizes 2” and less. For sizes 2 1/2” and above, install isolating flanges. Do not use dielectricunions.

Flanges

Shall be standard weight forged steel, welding neck, 150 pound A.S.A. Flanges shall have raisedor flat face as required to match valve or equipment face.

Unions

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PIPE & PIPE FITTINGS

15060PAGE 2 OF 5 APRIL, 1995

Generally, unions shall be malleable iron, ground joint type, 300 pound test. Unions in galvanizedpiping systems shall be galvanized. Unions in copper piping systems shall be wrought copper orbrass sweat ends.

Watertight Sleeves

Where underground piping penetrates foundation walls, provide steel sleeve with water tight seal.A/E shall locate wall penetrations on construction documents.

Fire Protection Pipe Material Requirements

Refer to Section 15300 - Fire Protection

Drainage and Vent Pipe Material Requirements

Storm and Non-Laboratory Waste and Vent Piping(Including toilet rooms and custodial closets)

Above ground piping shall be service weight "No-Hub" cast iron pipe with drainage pattern castiron fittings, and with heavy duty stainless steel clamps. Vent piping shall be the same as wastepiping.

Underground piping shall be extra heavy weight bell and spigot or “no-hub” cast iron with drainagepattern cast iron fittings All clamps for “no-hub” piping shall be stainless steel.

Refer to Tab 2 - Sitework for underground drainage tile piping.

Laboratory Sanitary Waste and Vent Piping(Excluding toilet rooms and custodial closets)

Above ground piping shall be corrosion resistant polypropylene Schedule 40. Joints shall bemechanical type. Glass piping may be considered on a case-by-case basis, especially where hightemperature waste may be present. All sink P-traps shall be of the same material as the waste pipe.

Underground piping shall be corrosion resistant polypropylene Schedule 80. Joints shall bemechanical type. High silicon cast iron may be considered if the application warrants the addedexpense. Piping shall be considered on a case-by-case basis where high temperature waste may bepresent.

Equipment Drains

Shall be Type "L" hard drawn copper piping with wrought copper solder DWV type fittings.

Pressurized Plumbing Pipe Material Requirements

Compressed Air and Natural Gas Piping (0 - 125 psig)

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PIPE & PIPE FITTINGS

15060APRIL, 1995 PAGE 3 OF 5

Above ground piping shall be Schedule 40 ASTM A-120 black steel pipe with 150 pound screwedmalleable iron fittings and screwed 300 pound malleable iron unions up to 2 inch size. Above 2”,piping shall be schedule 40 black steel with welded fittings. Copper piping with soldered joints maybe used for branch compressed air piping 3/4” and smaller.

Distilled and Deionized Water Piping

Shall be PVC Schedule 80 and in accordance with ASTM D2467 (cement socket type connectionfittings) and ASTM D785 piping.

High purity - Shall be white-line polypropylene, Schedule 40, ASTM D2447 or thermoseal fusiondepending on application.

Domestic Hot and Cold Water Piping

Above ground piping shall be type "L" hard temper seamless copper, ASTM-88 for pipe sizes 4”and smaller. Piping over 4” shall be flanged galvanized steel with flanged galvanized steel fittings.

Underground piping shall be type “K” copper for pipe sizes 2 1/2” and smaller, and ductile iron forpipe sizes 3” and above.

Nitrogen Piping

Shall be seamless copper, cleaned, ASTM B88 with silver solder joints. Use brazed joints using (BCup) filler metal, where required by NFPA 99.

Vacuum Piping

Shall be Type "L" hard drawn copper with wrought copper solder type fittings. Provide a pluggedcross at all turns greater than 45 degrees, slope in the direction of flow and provide hose end drainvalves at all low points for cleaning the system.

Hydronic and Steam Pipe Material Requirements

Chilled Water and Hot Water Heating Piping

Above ground piping shall be type “L” copper with wrought copper fittings for pipe sizes 4" andsmaller. Piping larger than 4" shall be Schedule 40 black steel with butt welded fittings. Flangedconnections may be used, standard weight with bolts and gaskets (similar to flanges on steampiping).

Underground piping shall be installed using a preinsulated piping system. Carrier pipe shall beSchedule 40 black steel with butt welded fittings. Jacket pipe shall be minimum 10 gauge steel, withbutt welded fittings, and a fiberglass reinforced urethane elastomer coating. Refer to section 15250for insulation requirements.

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PIPE & PIPE FITTINGS

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Condensate Piping

Above ground condensate piping shall be Schedule 80 black steel piping with extra heavy cast ironor malleable iron fittings.

Underground condensate piping shall be schedule 80 black steel with extra heavy fittings in apreinsulated system as described for underground chilled water and hot water heating piping.Condensate piping shall not be run in common jacket pipe with other carrier pipes.

Condenser Water Piping

Above ground condenser water piping shall be Schedule 40 black steel, ASTM A-53. Fittings shallbe butt welded black steel ASTM A-284.

Underground condenser water shall be ductile iron.

Refrigeration Piping

Shall be type "L" hard temper seamless copper, ASTM B88, ACR cleaned.

Steam Piping

Above ground steam piping up to 125 psig shall be Schedule 40 black steel pipe with 125 poundscrewed cast iron fittings up to 2 inch size and 125 pound black steel welded fittings for 2-1/2 inchsize and larger. Welding flanges shall be 150 pound forged steel. Flanged fittings shall be 125pound cast iron. Screwed unions shall be 300 pound forged steel, ground joint brass to steel.

Underground steam piping up to 125 psig shall be Schedule 40 black steel with butt welded fittings,in a preinsulated system as described for underground chilled water and hot water heating piping.

Civil Pipe Material Requirements

Generally, underground piping 5 feet or more from building exterior walls is considered to be “CivilPiping”. The following piping materials apply to Civil piping only, and may indicate that a change inpipe material takes place at this point. Refer to Tab 2 - Sitework for additional requirements.

Storm Sewer

Shall be reinforced concrete pipe (RCP), ASTM C-76, Class IV, with rubber gasketed joints,ASTM C-443, or High Density Polyethylene with rubber gasketed joints. For small projects withpiping limited to 6” and 8”, Schedule 80 PVC pipe may be used.

Sanitary Sewer

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PIPE & PIPE FITTINGS

15060APRIL, 1995 PAGE 5 OF 5

Shall be extra strength vitrified clay pipe (VCP) with O-ring joints. Sewers 15” and larger shall bereinforced concrete pipe (RCP), ASTM C-76, Class IV, with rubber gasketed joints, ASTM C-443

City Water Mains (for domestic water and fire protection)

Shall be Ductile Iron Class 52 with Polyethylene wrap.

Under Drainage Tubing

Shall be corrugated polyethylene tubing (AASHTO M 252) or corrugated polyvinylchloride tubing(ASTM F 800, with holes conforming to (AASHTO M 252)

Lawn Sprinkler Piping

Coordinate irrigation system design (including sizing water main, backflow preventer, and watermeter) and installation with the University Landscape Architects Office and the UM Plumbing shop,via the University Project Coordinator.

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