ASME B16.40-2019 pdf download

ASME B16.40-2019 pdf download.Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems.
Lubricants and Sealants. Lubricants and sealants shall be resistant to the action of gases referred to in para. 1.1(c). Lubricated valves, as defined in para. 1.5, are not within the scope of this Standard. 2.2.4 Responsibility. When service conditions, such as gases having high hydrogen content or compounds likely to form condensate, dictate special materials considera- tions, it is the user’s responsibility to specify this informa- tion to the manufacturer. 3 CONFIGURATION 3.1 Operating Indication (a) Valves designed for one-quarter turn operation shall be designed to visually show the open and closed position of the valve. A rectangular stem head with an arrow thereon or a separate position indicator shall indi- cate the closed position of the valve port when the lon- gitudinal axis of the stem head or indicator is perpendicular to the axis of the connecting pipe. If a sepa- rate indicator is used, it shall be designed such that it cannot be assembled to incorrectly indicate the position of the valve.Design Pressure The design pressure of the valve shall be limited to the maximum service pressure permitted for plastic pipe as specified in Pipe Design, 49 C.F.R., § 192.123 (2017). 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 D2513 or ASTM F2945 (e) DRv (f) the date each molded pressure shell part was molded. Valve shells that are not molded shall be stamped with the date of manufacture using low-stress stamping. An identifier traceable to the date of manufac- ture may be used as a substitute for date markings. The markings specified in (a) and (f) shall be perma- nently affixed to or 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 integ- rity or the operation of the valve.
Temperature Resistance. It shall be demon- strated that each nominal size of each basic valve design is capable of being operated at temperatures of −20°F ± 5°F (−29°C ± 3°C) and 140°F ± 5°F (60°C ± 3°C) without visible leakage to atmosphere and without affecting the internal seat-sealing performance of the valve. The test method is as follows: a closed valve shall be cooled to a temperature of −20°F ± 5°F (−29°C ± 3°C) and held at that temperature for a minimum of 18 hr. The valve shall then be pressurized with air or gas to a differential pressure across the seat equal to the valve design pressure. The valve shall then be opened against the applied-differential pressure, using a torque less than or equal to that of Table 6.3.1-1 at the −20°F (−29°C) values and then closed (no differential pressure across the seat required). The valve shall then be tested to meet the requirements of para. 6.2 while at −20°F (−29°C), except nonfreezing leak-detection agents shall be used. The valve shall be heated to a temperature of 140°F ± 5°F (60°C ± 3°C) and held at that temperature for a minimum of 18 hr. The closed valve shall then be pressurized with air or other gas to a differential pressure across the seat equal to the valve’s design pressure at 140°F (60°C). The valve shall then be opened against the applied-differ- ential pressure using a torque less than or equal to that of Table 6.3.1-1 values [140°F (60°C)] and then closed (no differential pressure across the seat required). The valve shall then be tested to and meet the requirements of para. 6.2 while at 140°F (60°C). 6.3.3 Sustained-Pressure Test. Each basic valve ð1 9Þ design shall be subjected to the sustained-pressure tests described herein to evaluate the long-term pressure integrity of the valve shell and closure elements. All valves shall be in the open position for the pressure-boundary test [see (a)] and in the closed position for the valve closure test .