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ASME B16.33 Document Information:
Title
Manually Operated Metallic Gas Valves for Use in Gas Piping Systems up to 125 PSI (Sizes NPS 1/2 Through NPS 2)
ASME International
Publication Date:
Jul 30, 2002
Scope:
General
This Standard covers requirements for manually operated metallic
valves sizes NPS ½ through
NPS 2, for outdoor installation as gas shut-off valves at the end of
the gas service line and
before the gas regulator and meter where the designated gauge pressure
of the gas piping system
does not exceed 125 psi (8.6 bar). The Standard applies to valves
operated in a temperature
environment between −20°F and 150°F (−29°C and
66°C).
Design
This Standard sets forth the minimum capabilities, characteristics,
and properties, which a valve
at the time of manufacture must possess, in order to be considered
suitable for use in gas piping
systems. Details of design and manufacture (other than those stated in
this Standard, including
such design and production tests that will produce a valve that will
have the required capabilities
to meet this Standard) remain the responsibility of the manufacturer.
Standards and Specifications
Standards and specifications adopted by reference in this Standard and
the names and addresses of
the sponsoring organizations are shown in Nonmandatory Annex A. 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
Nonmandatory Annex A. A product
made in conformance with a prior edition of reference standards and in
all other aspects conforming
to this Standard will be considered to be in conformance even though
the edition reference may be
changed in a subsequent revision of this Standard.
Quality Systems
Nonmandatory requirements relating to the manufacturer's Quality
System Program are described in
Non-mandatory Annex B.
Convention
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 "rounding 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 the Code of Federal Regulation
(CFR) such as 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.
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