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ASME B16.38 Document Information:
Title
Large Metallic Valves for Gas Distribution Manually Operated, NPS 21/2 (DN 65) to NPS 12 (DN 300), 125 psig (8.6 bar) Maximum
ASME International
Publication Date:
Jan 1, 2007
Scope:
Valve Types
This Standard covers requirements for manually operated metallic
valves in nominal sizes 2½ (DN 65) through 12 (DN 300) having the
inlet and outlet on a common centerline. These valves are intended
for controlling the flow of gas from open to fully closed
positions, for use in distribution and service lines where the
maximum gage pressure does not exceed 125 psig (8.6 bar). Valve
seats, seals, and stem packing may be nonmetallic.
Application
This Standard sets forth the minimum capabilities,
characteristics, and properties that a newly manufactured metallic
valve must possess in order to be considered suitable for use in
piping systems indicated above, carrying natural gas, manufactured
gas [includes synthetic natural gas (SNG)], and liquefied petroleum
gases (distributed as a vapor, with or without the admixture of
air) or mixtures thereof.
Referenced Standards
Standards and specifications adopted by reference in this
Standard and the names and addresses of the sponsoring
organizations are shown in Mandatory Appendix I. It is not
considered practical to refer to a specific edition of each of the
standards and specifications in the individual references. Instead,
the specific edition references are included in Mandatory Appendix
I. A product made in conformance with a prior edition of reference
standards will be considered to be in conformance, even though the
edition reference may be changed in a subsequent revision of the
standard.
Quality Systems
Nonmandatory requirements relating to the product manufacturer's
Quality System Program are described in Nonmandatory Appendix
A.
Convention
For the purpose of determining conformance with this Standard,
the convention for fixing significant digits where limits, maximum
or minimum values, shall be "rounded off" as defined in ASTM
Practice E 29. 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.
Codes and Regulations
A valve used under the jurisdiction of a Federal Regulation,
such as CFR Title 49, Part 192; the ASME Code for Pressure Piping,
such as ASME B31.8; or the National Fuel Gas Code, Z223.1, is
subject to any limitation of that code or regulation.
Definitions
NPS: nominal pipe size
NVS: nominal valve size
one bar: 100 kPa
PTFE: materials that comply with ASTM D 4894,
Specification for Polytetrafluoroethylene (PTFE) Granular Molding
and Extrusion Materials
All pressures, unless otherwise stated, are gage pressures.
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