Specification Diverter

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Diverter Damper Specification


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Diverter Damper Specification

1.0 Scope1.1 The diverter specification detailed here serves as a benchmark for the engineering,

design, procurement, fabrication, and shipment to the jobsite of Fox Equipment,LLC. Diverters. Field installation of Diverters will be by outside sources.

1.2 The Damper manufacturer holds responsibility for the engineering, design andfabrication services necessary for completion of the specified diverter. Suggestedmanufacturer is Fox Equipment, LLC, Jacksonville, Florida.

1.3 All necessary components, such as actuators and limit switches, will be providedand mounted by the damper manufacturer, unless otherwise specified. The

supplier shall test all diverters to ensure appropriate operation prior to shipping.

Written verification of operational testing will be maintained at themanufacturers facility unless requested by the field in another section of thisspecification.

2.0 Data, Drawing Requirements and Spare Parts List2.1 Complete technical information sheets, manuals and drawings required to

evaluate and maintain the diverter equipment will be supplied by the Vendor.

This includes: outline drawings, assembly drawings, control and wiring schematicdrawings, spare parts lists (with part number, price, and delivery information),

lubrication requirements and maintenance requirements.

3.0 Construction3.1 The client will specify construction materials that are appropriate for the

temperature, pressure, corrosive environment and abrasive environment of the

system.


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3.2 Diverter Frame3.2.1 The diverter frame shall be engineered for system design pressure and

design temperature as well as construction and transportation loadings.

3.2.2 Frames shall be rigid, thus prohibiting distortion under normal oremergency operating conditions, which could affect the operating or

leakage characteristics.

3.2.3 Each frame shall be flanged for fit-up bolting and seal welded to theflanges of the ductwork or expansion joint and will be fabricated as acompletely welded assembly. Diverters that exceed size requirements for

one (1) piece shipment will be supplied in sections that will require on-sitefield assembly. Diverter frames shall include mounting brackets designedto allow for thermal expansion for actuators furnished under these

specifications.

3.2.4 Frame section and thickness of all Diverters shall be determined basedupon the following factors: 1) transit and handling abuse stress, 2)combinations of pressure, temperature, wind, and/or seismic load, 3)

effects of corrosion and erosion, and 4) the physical dimensions andweight of the diverter. Stress in any structural component shall not exceed

60 % of yield strength as detailed in the AISC Steel Construction Manual

at design conditions.

3.2.5 All Diverter frames shall be manufactured with legs that have adequatestrength to support the frame as well as any other loads unless otherwise

specified.

3.3 Flap Diverter Blade3.3.1 Diverter blades shall be flap style and single composite. The diverter

blade deflection shall be limited to accommodate all sealing requirements

at operating conditions.

3.3.2 The stresses on all structural components shall be limited to thatspecifiedin AISC Construction Manual; the stress at system design conditions shallnot exceed 60% yield strength.

3.3.3 The blade shall be engineered to allow for differential thermal expansionsranging from ambient to maximum design temperature while continuously

sustaining efficient sealing.


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3.3.4 The blade stub shaft will be manufactured of round bar and will beappropriately connected to the blade. The blade and shaft shall be ofcompatible material so that each expands and contracts at a compatible

rate under changing thermal conditions.

3.3.5 The blade axle where required must extend the complete length of theblade.

3.3.6 For all HRSG and high temperature applications, the blade shall beinsulated to avoid heat transfer to both bypass or to the HRSG.

3.4 Bearing and Packing Glands3.4.1 Diverter blade shaft bearings will be utilized and selected based upon ambient

conditions at the damper installation site and take into consideration heat

transfer from the hot gas to the bearing.Each bearing, mount and the weldsholding the mount to the frame shall be designed with the strength and duty

necessary to withstand 200% of the stress transmitted from the system load onthe blade in addition to the actuator output torque. Diverter blade shaft

bearings shall be mounted outside of the exhaust gas stream and shall be

positioned at least six inches (6) from the packing gland to prevent flue gascontamination in the event that the packing gland fails.

3.4.2 A packing gland shall be seal welded to the damper frame for each shaftpenetration. This gland is to be filled with packing adequate for the ambientand gas stream conditions. The design of the packing gland ensures thatpacking may be replaced without removal of bearings, linkage, or operator.

3.5 Drive System3.5.1 Actuator, shafts and linkage shall be sized by applying a minimum 200%

safety factor to the required calculated torque. Design shall also take into

consideration factors that may affect the diverters operability includingthe system pressure and velocity, bearing and package friction, as well as

inertia. The design torque (including safety factor) of the actuator shallfall within the recommended torque range set forth by the actuator

manufacturer.

3.5.2 Connection of diverter blade shafts to the drive system shall be exterior tothe diverter frame. Linkage shall be completed, tested and fixed in

position to ensure that it is tight and free of vibration.


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3.5.3 The divertermanufacturer shall ensure that each diverter is supplied withan actuator that is mounted to the diverter. This actuator shall be mountedin shop prior to final inspection so that the manufacturer may link theactuator and operate the diverter with all components in place.

3.6 Seals3.6.1 Seals shall be furnished that achieve the shut-off required by customer.

The design and manufacture of the seals shall allow for differential

expansion and contraction of the blade and seals and shall include only

materials that may withstand the temperature and velocity of the gasstream. Seals shall be placed to eliminate the possibility of damage from

turbulent gas flow. Supplied seals will be adjustable or replaceable onsite.

3.7 Zero-Leak Diverter Seal Air System3.7.1 The seal air system is supplied by the diverter manufacturer and consists

of a seal air blower, connecting ductwork and blower isolation valve alldesigned to provide zero leakage flue gas downstream of the closed

diverter blade during operation of the seal air blower.

3.7.2 The seal air system includes a blower capable of providing safety factorsfor both seal air volume and pressure. Pressure will be at least 3.0 w.g.above operating pressure, and volume capacity will be at least 200% of

calculated volume at 3.0 w.g. above operating pressure.

4.0 Project Requirements4.1 Work and Components by Vendor

4.1.1 Work and components listed below will be provided by the appropriateVendor unless otherwise specified. Vendor is required to detail in a

proposal all items necessary for a complete system that are not listed hereand must quote them as optional.

4.1.1.1Diverter4.1.1.2Diverter Drive Mechanism (Operator)4.1.1.3Limit Switches


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4.1.1.4Seal Air System (if required)4.1.1.5All instrumentation and hardware necessary to make a complete

diverter package

4.2 Work and Components not included by Vendor4.2.1 Duct mounting hardware4.2.2 Duct mounting gasket4.2.3 Reversing starters and controls unless specifically requested

5.0 MaterialsAll materials utilized shall be new, high quality, and free of defects, and shall meet

manufacturers standards for the intended service and operating conditions.

6.0 Workmanship and Welding6.1 All products will be manufactured with high quality workmanship that complies

with currently established industrial practices. All surfaces shall be free of scaleand weld spatter and edges shall be free of burrs.

6.2 All welding shall be in accordance with the American Welding SocietysStructural Welding Code ASW D1.1 or ASME Section IX.

7.0 Inspection and Tests7.1 To allow for shop inspection of all parts and materials being supplied, Vendor

shall provide updates regarding the status of all work.

7.2 All welds are required to be visually examined, accepted, or rejected. Repairswill meet AWS or ASME guidelines.

7.3 All manufacturers standard factory tests shall be performed on equipment andmaterial.


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7.4 All diverter accessories, such as operators, fans and other electrical componentsshall be shop tested prior to shipment to assure proper operation.

7.5 All test results will be documented by the Vendor and supplied to the customerfor record and evaluation if required.

8.0 PaintAll equipment shall be finished per manufacturers paint specification as follows:

8.1 All purchased components such as valves, pneumatic actuators, etc., shall bepainted per manufacturers standards.

8.2 All machined surfaces shall be coated with rust preventative compound.8.3 All non-insulated exposed carbon steel surfaces shall meet job site finish

requirements.

9.0 Vendor Drawings9.1 Vendor shall supply drawings detailing general arrangement, operating

mechanisms, flange connections and mounting details.

9.2 All drawings shall conform to listed standards, and include a bill of materials.

10.0 Delivery, Shipping and Handling10.1 Units shall be shipped fully assembled whenever possible. Diverters requiring

shipment in multiple pieces shall be detailed in the proposal.

10.2 Materials for shipment should be appropriately crated, anchored, and blocked.10.3 Prior to shipment, diverters are to be sealed and protected sufficiently for outdoor

storage as indicated in the Vendors Installation Operating and Maintenance

Manual.

10.4 All bearings are to be protected with grease or lubricating oil.


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10.5 To prevent damage during shipment, all components must be packed or cratedand boxed. Small parts should be bagged, boxed or otherwise protected fromdamage or loss and shall be attached to the intended component.

11.0 Spare Parts11.1 The recommended spare parts list for one year of operation shall be provided in

the Vendors proposal.

12.0 Performance Guarantee12.1 The vendor shall guarantee that the equipment will meet performance

requirements allowing for safe, dependable operating conditions of this diverter.

13.0 Operation and Maintenance Manuals13.1 Vendor shall furnish a total of three (3) copies of an operation and maintenance

manual detailing installation, operation and maintenance, and storage.

14.0 Warranty14.1 Vendor shall submit the proposal with pricing based on a warranty period not less

than twelve (12) months of operation or eighteen (18) months after shipment.

15.0 Quality Program15.1 All engineering design, material procurement, fabrication and final shipment of

the diverter damper shall conform to a written Quality Control Program that will

be available to the client upon request.

15.2 The client shall have access to the facility where the fabrication of the diverterdamper is to be performed. The client will be given at least ten (10) days noticeprior to final equipment inspection and testing.

16.0 System Design Parameters for Flow Diverters1. Normal Operating Temperature


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2. Maximum temperature as well as an excursion along with frequency and duration3. System normal operating pressure (delta across closed damper)4. Maximum design pressure5. Flow volume6. Flow direction: horizontal or vertical for inlet, outlet and bypass7. Materials of construction8. Leakage requirements9. Diverter function (modulating or on/off)10.Type of actuation (pneumatic, electric, hydraulic) and power supply (80 psi air

supply, 480 volt / 3 Phase / 60 Hertz)

11.Bypass stack loading and moment12.Insulation Internal / External liner; Thickness required; Type required13.Accessories required

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Specification Diverter