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ASME B16.40-2013 pdf free

ASME B16.40-2013 pdf free.Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems.
ASME B16.40 covers manually operated thermoplastic valves in nominal valve sizes I,j through 12. These valves are intended for use below ground in thernioplastic fuel gas distribution mains and service lines. The maximum operating pressure (MOP) at which such distribution piping systems may be operated is in accordance with the Code of Federal Regulations (CFR) Title 49, Part 192, Transportation of Natural and Other Gas by Pipeline; Minimum Safety Standards, for temperature ranges of —20°F to 140°F (—29°C to 60°C).
‘b) This Standard sets qualification requirements for each basic valve design as a necessary condition for demonstrating conformance to this Standard.
(C) This Standard sets requirements for newly maimfactured valves for use in below-ground piping systems for fuel gas lincludes synthetic natural gas (SNG)I and liquefied petroleum (LP) gases (distributed as a vapor, with or without the admixture of air) or mixtures thereof.
1.2 References
Standards and specifications referenced under this Standard are shown in Mandatory Appendix II.
1.3 Conversion
For the purpose of determining conformance with this Standard, the convention for fixing significant digits, where limits maximum or minimum values are specified, shall be “rounded off” as defined in ASTM Practice E29. This requires that an observed or calculated value shall be rounded off to the nearest unit in the last right-hand digit used for expressing the limit. Decimal values and tolerances do not imply a particular method of measurement.
1.4 Relevant Units
The values stated in either inch or metric units are to be regarded separately as standard. Within the text, the values stated in each system are not exact equivalents; therefore, each system must be used independently of the other, Combining values from the two systems may result in nonconformance with the Standard.
1.5 Definitions
basic valve design: for a given valve design, each variation in material, size, or configuration of molded pressurecontaining parts shall constitute a different basic valve design, except where minor design variations are produced by differences in machining of the same molded piece(s) to produce different end sizes or dimensional ratios (DRs).
DR: the dimensional ratio defined as the pipe outside diameter (O.D.) divided by the pipe wall thickness, I. DR pO.D./t.
DRy: the valve DR equivalent is the designated valve
DR based on the lowest DR of the ASTM D2513 pipe
ends used in long-term hydrostatic testing under this
fasteners: nuts, bolts, washers, clip rings, and other devices used in the assembly of valves.
lubricated valves: valves that require pressure lubrication to effect a leak-tight seal (by the insertion through fittings of lubricant to the sealing surfaces of the valve).
NVS: nominal valve size.
pressure: unless otherwise stated, pressure is gage pressure.
production prescure tests: pressure tests that include seat and closure-member and shell tests.
scat and closurr-rni,nfrr test: an internal pressure test of closure-sealing elements (seats, seals, and closure members, such as gate. disc, ball, or plug).
shell test: an internal pressure test of the pressurecontaining envelope.
valve design pressure: the pressure calculated by the method described in Mandatory Appendix I using the valve shell material’s Hydrostatic Design Basis (HDL3) at 73°F (23°C).
1.6 Quality Systems
Nonmandatory requirements relating to the product manufacturer’s Quality System Program are described in Nonmandatory Appendix A.ASME B16.40 pdf download.

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