Abstract： ASME B16.44:2012 pdf download.Manually Operated Metallic Gas Valves for Use in Aboveground Piping Systems Up to 5 psi. 3.3.2.2 Tensile tests shall be conducted on six dumbbells in accordance with ASTM 1)412. Three of the tensile tests shall...

ASME B16.44:2012 pdf download.Manually Operated Metallic Gas Valves for Use in Aboveground Piping Systems Up to 5 psi.

3.3.2.2 Tensile tests shall be conducted on six dumbbells in accordance with ASTM 1)412. Three of the tensile tests shall be

conducted on dumbbells exposed in n-hexane at 73°F (23°C) for 70 hr in accordance with ASTM D471. The dumbbells shall have a

thickness of 0.08 in. ± 0.008 in. (2.0 mm ± 0.2 mm). The average of the three individual n-hexane tests shall exceed 60%

retention of ultimate elongation and 60% retention of tensile strength at break. The average of the three tests for the non-aged

specimens shall be the basis for the percent volume change calculation.

3.3.3 Elastomer Components — Compression Set. Elastomer parts that may be exposed to fuel gas shall be made from materials having a compression set of no more than 25% after 22 hr at 212°F (100°C), in specimens in accordance with ASTM D395, para. 5.2.

3.3.4 PolytetrafluoroethyLene (PTFE) Materials.

PTFE materials shall comply with ASTM D4894 or 1)4895.

3.4 Temperature Resistance

The materials used for valve bodies, plugs, bonnets, unions, and other external parts, excluding handles, shall have a solidus

temperature in excess of 800°F (427°C). Seals and lubricants are exempt from this requirement.

3.5 Corrosion Resistance

3.5.1 Indoor Atmosphere. Those parts that are provided with automatic compensation for wear shall be corrosion resistant with

respect to indoor atmosphere (i.e., humidity and airborne contaminants such as chie— ride and ammonia).

3.5.2 Salt Spray. Valves designated by the manufacturer for outdoor use shall meet the requirements of this paragraph. Valve ends

shall be sealed with appropriate fittings. The valve shall then be exposed for 96 hr to a salt spray (fog) test as specified in

ASTM B117. Salt spray (fog) testing temperature shall he maintained between 92°F and 97°F (33°C and 36°C). The saline solution shall consist of 5% sodium chloride and 95% distilled water by weight. Following the salt spray (fog) test, the valve shall be

removed from the chamber and examined with the unaided eye.

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