Abstract： ASME B16.40:2013 pdf download.Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems. 4 PRESSURE RATING 4.1 Maximum Pressure Rating The maximum pressure rating of each valve is the valve design pressure as defin...

ASME B16.40:2013 pdf download.Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems.

4 PRESSURE RATING

4.1 Maximum Pressure Rating

The maximum pressure rating of each valve is the valve design pressure as defined in para. 1.5 for service from —20°F to 14k)°F (—29°C to 60°C).

4.2 Design Pressure

The design pressure of the valve shall be limited to the maximum service pressure permitted for plastic pipe as specified in 49

CFR, Part 192.123.

5 MARKING

Each valve shall be clearly marked to show the following:

(a) the manufacturer’s name or trademark.

(b) the designation B16.40.

(C) the NVS.

(d) the pressure shell material designation code as specified in ASTM D 2513.

(e) DRy.

(f) each molded pressure shell part shall be marked with the date it was molded. Valve shells that are not molded shall be stamped with the date of manufacture using low-stress stamping.

The markings specified in paras. 5(a) and (f) shall be permanently affixed to or be incorporated as part of the permanent valve

identification.

Other markings may be affixed to the valve by any means, provided they do not impair the structural integrity or the operation of

the valve.

6 PRODUCTION AND QUALIFICATION TESTING

6.1 General

(a) Gas tightness of production valves shall be demonstra ted by subjecting each valve to shell and seat tests in accordance with

para. 6.2.

(b) Each basic valve design shall be qualified by testing randomly selected production valves in accordance with para. 6.3.

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