Page_169_Grating_to_A02_CF_PumpSta4.ADV_specs.pdf

06 73 01-4 with the resin and synthetic surface veils pulled with the part, on each surface. Guardrail systems shall be Class 1 fire retardant with an ASTM E 84 flame spread rating of 25 maximum. Color shall be safety yellow throughout.

2.2.2.1.2 Guardrail Fabrication. Rigid joints in railings shall be flush-finished. Joints shall be reinforced with tight-fitting interior solid packing and shall be assembled by joining rails and posts in accordance with guardrail manufacturer's recommendations. All cutting and drilling of holes shall be performed in the shop at the time of fabrication. Railings shall be free of burrs, sharp corners, and sharp edges. Installed railings shall be capable of withstanding a design working load of 200 pounds applied in any direction at any point on the top rail without permanent deformation.

2.2.2.2 Fiberglass Grating and Recess Frame. Grating shall be of the types and sizes specified and as shown on the drawings and shall accurately fit within the supporting recess frame. Grating panels shall be provided as shown on the drawings or as required. Hinged panels shall be provided with hinges of the type shown on the drawings or suitable for the application. The grating shall be fiberglass roving reinforced polyester, constructed to provide complete wetting of the glass by the resin. The grating shall be made in a mold and of single piece construction so the reinforcing glass of the bearing bars are interwoven with the glass of the crossbars. The tops of the bearing bars and cross members shall be in the same plane. The grating shall be translucent to enable inspection for defects, air bubbles and thorough glass wetting. The resin shall be a chemical grade polyester such as CP-84 or approved equal. Grating bars shall be tapered, to provide self cleaning.

Angular silica particles shall be integrally embedded in laminate as non-skid surface on walking areas. All cut or sanded surfaces shall be coated with resin with air inhibiting additives. Grating shall be UV resistant. Grating shall be fastened in place with stainless steel ("J" or saddle type) hold down clips. Fasteners shall be of the type recommended by the manufacturer and approved by the Contracting Officer. Spacing of hold down clips shall be as recommended by the grating manufacturer. Installation clearances, bearing, and bracing shall be in accordance with manufacturer's recommendations.

2.2.2.2.1 Grating . Bearing bars shall be 1-1/4 inches high by 1/4 wide on 1-1/4 inch centers; cross bars shall be 1-1/4 inch high by 1/4 inch wide on 1-1/4 inch centers. Grating shall be suitable for a uniform load of 140 pounds per square foot with maximum 1% deflection when supported at 30 inches and 175 psf at a 10 to 1 safety factor.

2.2.3 PVC Pipe and Fittings. Polyvinylchloride material shall conform to Type 1 ASTM D 1784. Polyvinylchloride pipe shall conform to ASTM D 1785, Schedule 40. Fittings shall conform to ASTM D 2466.

2.3 SEALANT. Sealant shall conform to ASTM C 920, Type S or M, Class 25 joint sealant. Color shall be clear. Bond breaker material shall be polyethylene tape, coated paper, metal foil or similar type materials. The back-up material shall be compressible, nonshrink, nonreactive with sealant, and nonabsorptive material type such as extruded butyl or polychloroprene foam rubber.