Diverter Damper Specification

Diverter Damper Specification

1.0 Scope

1.1 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 and

fabrication services necessary for completion of the specified diverter. Suggested manufacturer is Fox Equipment, LLC, Jacksonville, Florida.

1.3 All necessary components, such as actuators and limit switches, will be provided

and 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 the manufacturer’s facility unless requested by the field in another section of this specification.

2.0 Data, Drawing Requirements and Spare Parts List

2.1 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 schematic drawings, spare parts lists (with part number, price, and delivery information), lubrication requirements and maintenance requirements.

3.0 Construction

3.1 The client will specify construction materials that are appropriate for the temperature, pressure, corrosive environment and abrasive environment of the system.

3.2 Diverter Frame

3.2.1 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 or emergency 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 the

flanges of the ductwork or expansion joint and will be fabricated as a completely welded assembly. Diverters that exceed size requirements for one (1) piece shipment will be supplied in sections that will require on-site field assembly. Diverter frames shall include mounting brackets designed to allow for thermal expansion for actuators furnished under these specifications.

3.2.4 Frame section and thickness of all Diverters shall be determined based

upon 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 and weight 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 adequate

strength to support the frame as well as any other loads unless otherwise specified.

3.3 Flap Diverter Blade

3.3.1 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 that specified

in AISC Construction Manual; the stress at system design conditions shall not exceed 60% yield strength.

3.3.3 The blade shall be engineered to allow for differential thermal expansions

ranging from ambient to maximum design temperature while continuously sustaining efficient sealing.

3.3.4 The blade stub shaft will be manufactured of round bar and will be

appropriately connected to the blade. The blade and shaft shall be of compatible 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 the

blade. 3.3.6 For all HRSG and high temperature applications, the blade shall be

insulated to avoid heat transfer to both bypass or to the HRSG.

3.4 Bearing and Packing Glands

3.4.1 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 welds holding 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 on the 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 gas contamination in the event that the packing gland fails.

3.4.2 A packing gland shall be seal welded to the damper frame for each shaft

penetration. This gland is to be filled with packing adequate for the ambient and gas stream conditions. The design of the packing gland ensures that packing may be replaced without removal of bearings, linkage, or operator.

3.5 Drive System

3.5.1 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 diverter’s operability including the system pressure and velocity, bearing and package friction, as well as inertia. The design torque (including safety factor) of the actuator shall fall 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 to

the diverter frame. Linkage shall be completed, tested and fixed in position to ensure that it is tight and free of vibration.

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

3.6 Seals

3.6.1 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 gas stream. Seals shall be placed to eliminate the possibility of damage from turbulent gas flow. Supplied seals will be adjustable or replaceable on site.

3.7 Zero-Leak Diverter – Seal Air System

3.7.1 The seal air system is supplied by the diverter manufacturer and consists of a seal air blower, connecting ductwork and blower isolation valve all designed 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 factors

for 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 Requirements

4.1 Work and Components by Vendor

4.1.1 Work and components listed below will be provided by the appropriate Vendor unless otherwise specified. Vendor is required to detail in a proposal all items necessary for a complete system that are not listed here and must quote them as optional.

4.1.1.1 Diverter 4.1.1.2 Diverter Drive Mechanism (Operator)

4.1.1.3 Limit Switches

4.1.1.4 Seal Air System (if required)

4.1.1.5 All instrumentation and hardware necessary to make a complete

diverter package

4.2 Work and Components not included by Vendor

4.2.1 Duct mounting hardware 4.2.2 Duct mounting gasket 4.2.3 Reversing starters and controls unless specifically requested

5.0 Materials

All materials utilized shall be new, high quality, and free of defects, and shall meet manufacturer’s standards for the intended service and operating conditions.

6.0 Workmanship and Welding

6.1 All products will be manufactured with high quality workmanship that complies with currently established industrial practices. All surfaces shall be free of scale and weld spatter and edges shall be free of burrs.

6.2 All welding shall be in accordance with the American Welding Society’s

Structural Welding Code ASW D1.1 or ASME Section IX.

7.0 Inspection and Tests

7.1 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. Repairs

will meet AWS or ASME guidelines.

7.3 All manufacturers’ standard factory tests shall be performed on equipment and material.

7.4 All diverter accessories, such as operators, fans and other electrical components shall 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 customer

for record and evaluation if required.

8.0 Paint All equipment shall be finished per manufacturer’s paint specification as follows: 8.1 All purchased components such as valves, pneumatic actuators, etc., shall be

painted per manufacturer’s 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 Drawings

9.1 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 Handling

10.1 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 Vendor’s Installation Operating and Maintenance Manual.

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

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

11.0 Spare Parts

11.1 The recommended spare parts list for one year of operation shall be provided in the Vendor’s proposal.

12.0 Performance Guarantee

12.1 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 Manuals

13.1 Vendor shall furnish a total of three (3) copies of an operation and maintenance manual detailing installation, operation and maintenance, and storage.

14.0 Warranty

14.1 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 Program

15.1 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 diverter

damper is to be performed. The client will be given at least ten (10) days notice prior to final equipment inspection and testing.

16.0 System Design Parameters for Flow Diverters

1. Normal Operating Temperature

2. Maximum temperature as well as an excursion along with frequency and duration 3. System normal operating pressure (delta across closed damper) 4. Maximum design pressure 5. Flow volume 6. Flow direction: horizontal or vertical for inlet, outlet and bypass 7. Materials of construction 8. Leakage requirements 9. 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 moment 12. Insulation – Internal / External liner; Thickness required; Type required 13. Accessories required