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ASME B16.34 Document Information:
Title
Valves - Flanged, Threaded, and Welding End
ASME International
Publication Date:
Jan 1, 2004
Scope:
General
This Standard applies to new construction and covers
pressure-temperature ratings, dimensions,
tolerances, materials, nondestructive examination requirements,
testing, and marking for cast,
forged, and fabricated flanged, threaded, and welding end and wafer or
flangeless valves of steel,
nickel-base alloys, and other alloys shown in Table 1. Wafer or
flangeless valves, bolted or
through-bolt types, that are installed between flanges or against a
flange are treated as
flanged-end valves. Alternative rules for NPS 2½ and smaller
valves are given in Mandatory
Appendix V.
Applicability
Standards and Specifications.
Standards and specifications adopted by reference in this Standard and
the names and addresses of
the sponsoring organizations are shown in Mandatory Appendix VIII. It
is not considered practical
to refer to a specific edition of each of the standards and
specifications in the individual clause
references. Instead, the specific edition references are included in
Mandatory Appendix VIII. A
product made in conformance with a prior edition of reference
standards and in all other respects
conforming to this Standard shall be considered to be in conformance
even though the edition
reference may have been changed in a subsequent revision of this
Standard.
Time of Purchase, Manufacture, or Installation.
The pressure-temperature ratings included in this Standard are
applicable, upon publication, to all
valves covered within its scope that meet its requirements. For unused
valves, valves which have
been maintained in inventory, the manufacturer may certify conformance
to this edition provided
that it can be demonstrated that all requirements of this edition have
been met. However, where
such components were installed under the pressure-temperature ratings
of an earlier edition of ASME
B16.34, those ratings shall apply except as may be governed by an
applicable Code or regulation.
User Accountability.
This Standard cites duties and responsibilities that are to be assumed
by the valve user in the
areas of, for example, application, installation, system hydrostatic
testing, operation, and
material selection.
Quality Systems.
Requirements relating to a valve manufacturer 's Quality System
Program are described in
Nonmandatory Appendix C.
Relevant Units.
This Standard states valves in both metric and U.S. customary units.
These systems of units are to
be regarded separately. The U.S. customary units are shown in
parentheses or are listed in separate
tables. The values stated in each system are not exact equivalents;
therefore it is required that
each system of units be used independently of the other. Combining
values from the two systems
constitutes nonconformance with the Standard.
Service Conditions
Criteria for selection of valve types and materials suitable for
particular fluid service are not
within the scope of this Standard.
Convention
For the purpose of determining conformance with this Standard, the
convention for fixing
significant digits where limits, maximum and 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 tolerance do not imply a particular method of measurement.
Denotation
Pressure Rating Designation.
Class, followed by a dimensionless number, is the designation for
pressure-temperature ratings.
Standardized designations are as follows:
Class 400, an infrequently used flanged-end valve designation, is
regarded as an intermediate class
designation.
Size.
NPS, followed by a dimensionless number, is the designation for
nominal valve size. NPS is related
to the reference nominal diameter, DN, used in international
standards. The relationship is,
typically, as follows:
For NPS ≥ 4, the related DN is: DN = 25 multiplied by the NPS
number.
References
Codes, standards, and specifications, containing provisions to the
extent referenced herein,
constitute requirements of this Standard. These reference documents
are listed in Mandatory
Appendix VIII.
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