Specification Wafer

7/29/2019 Specification Wafer

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Wafer Damper Specification



Wafer Damper Specification

1.0 Scope

1.1 The wafer specification detailed here serves as a benchmark for the engineering,design and fabrication of utility grade wafer dampers.

1.2 The Damper manufacturer holds responsibility for the engineering, design andfabrication services necessary for completion of the specified wafer damper.Suggested manufacturer 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. The supplier shall test all wafer dampersto ensure appropriate operation prior to shipping.

1.3.1 Every wafer damper will be cycled through its full operating stroke, opento closed position, five (5) times.

1.3.2 Written verification of operational testing will be maintained at themanufacturer’s facility unless requested by the field in another section of this specification.

2.0 Submittal Drawings

2.1 Comprehensive submittal drawings will be completed by the wafer dampermanufacturer and provided to the customer for review and approval. Fabricationshall start only when submittal drawings have customer’s final approval. Submittal

drawings shall include all system design parameters, accessories and performancedata, as well as a bill of material that details major components and interfacedimensions.

3.0 Construction



3.1 The client will specify construction materials that are appropriate for the

temperature, pressure, corrosive environment and abrasive environment of thesystem.

3.2 Frames

3.2.1 Damper frames shall be rolled structural shapes with integrated flangesthat are engineered for the system environment as well as construction andtransportation loadings.

3.2.2 The wafer damper unit shall require no external supports or bracing.Stress shall not exceed 60% of yield strength as specified in the AISC

Steel Construction Manual.

3.3 Blades

3.3.1 All wafer damper blades will be manufactured as single thickness solid plateand are engineered to limit their deflection to one three hundred and sixtieth(1/360th) of the span at operating conditions.

3.3.2 The stress at system design conditions shall not exceed 60% of yield strengthas specified in AISC steel construction manual.

3.3.3

Allowances shall be made for differential expansion and contraction of thedamper blade.

3.4 Seals

3.4.1 To ensure tight shutoff, seal bars or gaskets may be attached to the damperframe in clean gas streams. This option is not appropriate under dustyconditions because particulate may accumulate around the seal, thuspreventing the blade from seating properly on the seal.

3.5 Packing Glands and Bearings

3.5.1 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.



3.5.2 Ball or sleeve type bearings will be utilized and selected based upon ambient

conditions at the wafer damper installation site and the temperaturetransmission from the damper shaft to the bearings.

3.5.3 Bearings shall be positioned at an adequate distance from the packing gland toprevent flue gas contamination in the event that the packing gland fails.

3.6 Drive System

3.6.1 Actuators, shafts and linkage shall be sized with minimum three to one (3:1)safety factor. The design torque (including safety factor) of the actuator shallfall within the recommended torque range set forth by the actuator

manufacturer.3.6.2 The damper manufacturer shall ensure that each damper is supplied with anactuator that is mounted out of the gas stream. This actuator shall be mountedin shop prior to final inspection so that the manufacturer may link the actuatorand operate the damper with all components in place.

3.6.3 The strength of the actuator mount in any mode of stress must be adequate towithstand up to 30% of the yield strength based on the necessary actuatortorque.

4.0

Welding

4.1 All welding shall be performed in accordance with the American Welding SocietyProcedure D1.1 or ASME Section IX.

5.0 Quality Program

5.1 All engineering, design, material procurement, fabrication and final shipment of thewafer damper shall conform to a written Quality Control Program that will beavailable to the client upon request.

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

6.0 System Design Parameters Required for Wafer Dampers



1. Normal gas stream temperature

2. Maximum temperature as well as an excursion along with frequency and duration3. System normal operating pressure (delta across closed damper)4. Maximum pressure5. Corrosive or abrasive properties of the gas stream6. Flow volume7. Flow direction, horizontal or vertical8. Type of actuation9. Materials of construction

Specification Wafer

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