ASME B16.40 pdf free download

ASME B16.40-2019 pdf free download.Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems.
2 CONSTRUCTION
2.1 GeneraL
(a) The workmanship used in the manufacture and assembly of each valve shall provide gas tightness. safety and reliability of performance, and freedom from Injurious imperfections and defects.
(b) Design details not addressed in this Standard are the responsibility of the manufacturer.
2.2 MateriaLs
2.2.1 Valve SheLl. The pressure-containing valve shell shall be made from either PE or PA-il materials specified in and qualified to the requirements for pipe and fittings as listed in ASTM D2513 or ASTM F2945.
2.2.2 Parts Other Than the VaLve SheLL. Parts other than the valve shell that contribute to pressure containment or retaining differential pressure across the closure element shall be resistant to the gases in para. 1.1(c). Such parts shall be designed to withstand normal valve-operating loads and, in addition, shall provide long-term pressure-containment Integrity consistent with the valve shell. The sustained pressure tests of para. 6.3.3 shall qualify the design and material selected for these parts, which Include, but are not limited to, the closure member, stems or shafts (if they are designed to retain pressure), and fasteners retaining shell sections.
2.2.3 Lubricants and Seatants. 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 considerations, it is the user’s responsibility to specify this information 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 indicate the closed position of the valve port when the longitudinal axis of the stem head or Indicator is perpendicular to the axis of the connecting pipe. If a separate indicator is used, it shall be designed such that it cannot be assembled to incorrectly Indicate the position of the valve.
(b) Valves designed for more than one-quarter turn operation shall close by clockwise stem rotation, unless otherwise specified by the user. The direction for closing the valve shall be indicated.
3.2 VaLve End Design
Valve ends shall be designed to one or more of the following, unless otherwise specified by the user:
(a) PE valve stub-ends that conform to the applicable dimensions of ASTM D2513 or ASTM D3261
(b) PA-il valve stub-ends that conform to the applicable dimensions of ASTM F2945 or ASTM F 1733
(c) PE socket ends that conform to the applicable dimensions listed in ASTM D2683
(d) integral mechanical joints that meet the requirements of the applicable paragraphs under Joining of
Materials Other Than by Welding. 49 C.F.R., §
192.281-192.287 (2017)
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 140°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 Pipe DesIgn. 49 C.F.R., § 192.123 (2017).
5 MARKING
Each valve shall be clearly marked to show the following:
(a) the manufacturers name or trademark
(b) the designation B 16.40
(c) the NVS
(d) the pressure shell material designation code as specified in ASTM D2513 or ASTM F2945
(e) DRy
(I) 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 manufacture may be used as a substitute for date markings.
The markings specified in (a) and (f) shall be permanently amxed 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 integrity or the operation of the valve.ASME B16.40 pdf download.