Section 15810 FIBERGLASS DUCTING AND DAMPERS

Section 15810

FIBERGLASS DUCTING AND DAMPERS

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. The Contractor shall furnish and install fiberglass ducting and appurtenances for a complete installation as specified herein and in accordance with the requirements of the Contract Documents.

1.2 REFERENCE SPECIFICATIONS, CODES AND STANDARDS

A. The work of the following sections applies to the work of this Section. Other sections of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this work:

1. General Conditions

2. Section 01300, Submittals

3. Section 15090, Expansion Joints

B. All equipment, products, and their installation shall be in accordance with the following standards, as applicable, and as specified:

ASTM D 635 Standard Test Method for Rate of Burning and/or Extent and Time of Burning of Self-Supporting Plastics in a Horizontal Position

ASTM D 638 Test Method for Tensile Properties of Plastics

ASTM D 790 Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials

ASTM D 2996 Standard Specification for Filament-Wound “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Pipe

ASTM D 6041 Standard Specification for Contact-Molded “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Corrosion Resistant Pipe and Fittings

ASTM E 84 Standard Test Method for Surface Burning

Characteristics of Building Materials

SMACNA Duct Construction Manual

National Bureau of Standards Voluntary Product Standard PS 15-69, Standards "Custom Contact-Molded Reinforced-Plastic Chemical- Resistant Process Equipment"

1.3 CONTRACTOR SUBMITTALS

A. Submittals shall be made in accordance with the General Requirements and Section

01300, Submittals.

B. Resin corrosion charts and fire ratings.

C. Shop drawings: Shop drawings shall show layout, materials, supports, transition sections and all miscellaneous equipment required for a complete installation.

D. The Contractor shall submit for review and approval complete ducting lay-out drawings showing ducting, fittings, couplers, hangers, supports, wall castings, sleeves, and all required appurtenances. Layout drawings shall indicate any and all interfaces with other systems being installed.

E. It is the responsibility of the Contractor to coordinate all work being performed and review all shop drawings to insure that no unnecessary interference exist.

F. The Contractor shall submit as part of the shop drawings for FRP Ducting, a statement from the duct manufacturer certifying that all pipe is being fabricated per the requirements of these specifications.

G. Samples of fiberglass with available colors shall be submitted to the ENGINEER for final color selection. The duct shall be adequately reinforced or temporarily braced to limit the internal deflection and prevent cracking of the corrosion-resistant interior surface of the duct during the placement of concrete encasements or the casting of the duct in concrete at wall penetrations.

1.4 QUALITY ASSURANCE

A. Inspection and Testing Requirements: The ENGINEER reserves the right to reject any pieces of equipment found to have any of the following defects: blisters, chips, crazing, exposed glass, cracks, burned areas, dry spots, foreign matter, surface porosity, sharp discontinuity or entrapped air at the surface of the laminate. Any item that does not satisfy the tolerances below will be rejected.

FRP PRODUCT TOLERANCES
Defect	Inside Surface	Outside Surface
Blister	None	Max dimension: 1/4-in dia by 1/8-in high; max density: 1 per sq ft; min separation: 2 in apart
Chips	None	Max dimension of break: 1/4-in and thickness no greater than 10 percent of wall thickness; max density: 1 per sq ft
Crazing	None	Max length: 1/2-in; max density: 5 per sq ft; min separation: 2-in
Cracks	None	None
Exposed Glass	None	None
Scratches	None	Max length: 1-in; max depth: 0.010-in.
Burned Areas	None	None
Surface Porosity	None	None
Foreign Matter	None	None
Sharp Discontinuity	None	None
Pits	Max 1/8-in dia by 1/32-in deep Max: 10 per sq ft	Max 1/8-in dia by 1/16-in deep; Max: 10 per sq ft
Dry Spot	None	2 sq in per sq ft
Entrapped Air	None at the surface; 1/16-in and 10 per sq in max within laminate	1/8-in and 4 per sq in or1/16-in and 10 per sq in

B. The manufacturer of the fiberglass ducting shall have had at least 5 years previous experience in fabricating corrosion-resistant, fire retardant fiberglass-reinforced plastic structures.

PART 2 - PRODUCTS

2.1 GENERAL

A. The general term "fiberglass" as used in these specifications or on the Contract Documents shall designate a fiberglass reinforced plastic laminate consisting of approximately 25-30 percent fiberglass reinforcement and 70-75 percent resin.

B. All fiberglass shall be fire retardant and UV resistant. The maximum flame spread rating shall not exceed 25 when tested in accordance with ASTM E 84.

2.2 DESIGN

A. Allowable stresses used for ducting design shall be not greater than 20 percent of the minimum physical properties set forth in Table 1 of PS 15-69. Minimum thickness for filament-wound or contact-molded ducting shall be as follows:

Duct Size (Inches)	Minimum Thickness (Inches)
18 or smaller	3/16
20 to 36	1/4
42 to 54	3/8
60 to 72	7/16

B. All duct shall be designed for not less than 2 psig pressure and 5-inch water column vacuum, unless otherwise specified.

2.3 RESIN

A. The resin used in the manufacture of the fiberglass, internal supports and any field connections shall be resistant to corrosion by water, hydrogen sulfide and other corrosive gases present in wastewater treatment plants, caustic, dilute sulfuric acid and hydrochloric acid solutions.

B. All exterior surfaces of fiberglass shall contain adequate ultraviolet absorber as recommended by the resin manufacturer for maximum ultraviolet protection.

C. The resin shall be reinforced with an interior Type "C" fiberglass veil and an exterior continuous, even-tensioned fiberglass filament wound or hand lay-up reinforcement. The exterior surface gelcoat resin shall be pigmented so that the color of the duct will be similar to the paint used for equipment on each individual job except that ducting which is concealed above suspended ceilings or buried need not be pigmented.

D. All fiberglass resin used in the manufacture of fiberglass duct shall be the following or equal:

1. Derakane 510A-40 (with antimony trioxide)

2. Dion Ver 9300FR (with antimony trioxide)

3. Hetron 992FR (with antimony trioxide)

2.4 FIBERGLASS DUCTING

A. Fiberglass ducting shall be either filament-wound or contact-molded fiberglass-reinforced plastic resin construction. All duct and fittings buried or cast into the walls of structures shall be filament-wound construction.

B. Filament-wound ducting shall consist of an inner liner or corrosion barrier and an outer structural wall. The inner liner shall be made up of a minimum of 10 mils of resin-rich smooth surface reinforced with Type "C" glass veil and an additional layer of 100 mils of material consisting of 75 percent resin and 25 percent non-continuous glass reinforcement. The outer structural wall shall consist of continuous glass roving applied at a uniform helix angle. No bulking agents or chopped glass fiber shall be used in the exterior structural wall. All structural reinforcement shall be exterior.

C. Contact-molded fiberglass ducting and fittings shall comply with the National Bureau of Standards Voluntary Product Standard PS 15-69, "Custom Contact-Molded Reinforced- Plastic Chemical-Resistant Process Equipment." Fiberglass resin shall be fire retardant. The manufacturer of the ducting shall have certified test facilities to demonstrate the ability to meet the minimum standards stated in these specifications or, if the manufacturer does not have in-plant test facilities, certifications shall be accomplished by a qualified independent laboratory at the manufacturer's expense.

D. Manufacturers or Equal

1. Paramount Fabricators

2. Belco Manufacturing

3. Perry Fiberglass

2.5 FIBERGLASS DUCTING SUPPORTS

A. Ducting supports, hangers, accessories and foundations shall be supplied and installed by the Contractor at locations shown on the Contract Documents. All ducting fasteners shall be Type 316 stainless steel unless otherwise indicated.

2.6 FLEXIBLE DUCT CONNECTIONS

A. Flexible duct connections shall be in accordance with Section 15090 Part 2.1-b.

2.7 GASKETS

A. Flange gaskets shall be 1/8-inch neoprene over full-flange face. Ducting with diameters greater than 36 inches shall be fitted with 1/2-inch neoprene gaskets. Plexiglas blind flanges shall be 3/8-inch minimum thickness with 1/2-inch neoprene gaskets over the full- flange face.

2.8 VOLUME DAMPERS

A. Provide manual balancing volume dampers in each branch duct and in each main duct to provide for complete balancing.

B. Furnish Round FRP Single Blade Fiberglass Dampers

1. Damper frame shall be one piece construction with resin rich interior corrosion barrier of minimum thickness of 100 mils. The glass to resin ratio shall be a minimum of 35% glass to 65% resin. Wall thickness, flange thickness, drilling pattern and width shall conform to PS15-69.

2. The damper blade shall be constructed of the same material as the damper frame and shall have a resin rich surfacing veil on both sides. Blade stiffeners shall be FRP or FRP encapsulated as required for stiffness.

3. The axle shall be pultruded fiberglass or 316 stainless steel, as required to meet corrosion resistance requirements. Leakage shall not exceed 3 cfm per square foot at 12” wc or 5.25 cfm per square foot at 30” wc.

4. All interior metal shall be 316 stainless steel. Gaskets shall be EPDM.

C. Fit each manual volume damper with bearing and an adjusting device having a locking mechanism. Provide access panels if concealed or inaccessible.

D. Cut slot in damper rod (quadrant end) to indicate blade position. E. Acceptable Manufacturers

1. Belco Manufacturing

2. Paramount Fabricators

2.9 DUCT ACCESS DOORS

A. Hinged, airtight, access doors shall be provided where required for access to control elements or for inspection.

B. Access doors shall be fabricated in accordance with SMACNA HVAC Duct Construction

Standards - Metal and Flexible.

C. Access doors shall be rigid and close-fitting, with sealing gaskets and quick fastening locking devices as follows:

1. Less than 12-inches Square: Sash locks.

2. Up to 18-inches Square: Two hinges and two sash locks.

3. Up to 24-inches by 48-inches: Three hinges and two compression latches with outside and inside handles.

4. Larger Sizes: An additional hinge shall be provided.

PART 3 - EXECUTION

3.1 INSTALLATION

A. All ducting shall be reinforced as required to prevent sagging and to resist pressures and vacuums, which might be encountered in each particular application.

B. Joints within the duct system may be flanged, butt and strap or slip-on, however, flanges shall be used where indicated on the Contract Documents. All fittings and joints shall be equal or superior to the adjacent pipe section in strength and corrosion resistance. Right- angle elbows shall be of the five-gore type.

C. Supports shall be spaced not greater than 5-foot centers for contact-molded duct and not greater than 10-foot centers for filament-wound duct unless otherwise indicated. The Contractor shall be responsible for the correct size and location of openings in structures required for the installation of the ductwork. All fasteners and fittings for ducting shall be Type 316 stainless steel.

D. The Contractor shall furnish, at no additional cost to the District, any additional transition sections required to connect ventilation fans to the ductwork system or foul air scrubbers.

E. To ensure airtight ducts, flanged joints shall be sealed with closed-cell neoprene gaskets compressed between mating flanges. Other joints and seams shall be sealed with liquid- or mastic-type sealants. Taped joints will not be permitted. All joints shall be in accordance with SMACNA Seal Class A.

F. Accessories shall be installed in accordance with manufacturer's written instructions, NFPA 90A, and SMACNA HVAC Duct Construction Standards - Metal and Flexible.

G. Duct access doors shall be provided for inspection and cleaning before and after fans, automatic dampers, at fire dampers, combination fire and smoke dampers, and elsewhere as indicated. Access doors shall be a minimum 8-inches by 8-inches size for hand access, 18-inches by 18-inches size for shoulder access, and as indicated. Four-inch by 4-inch access door shall be provided for balancing dampers only. Location of all access doors shall be reviewed prior to fabrication.

END OF SECTION