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ASME B16.15 Document Information:
Title
Cast Copper Alloy Threaded Fittings Classes 125 and 250
ASME International
Publication Date:
Jan 1, 2006
Scope:
This Standard covers cast Classes 125 and 250 copper alloy
threaded pipe fittings with provisions for substituting wrought
copper alloys for plugs, bushings, caps, and couplings in small
sizes. This Standard includes
(a) pressure–temperature ratings
(b) size and method of designating openings of reducing
pipe fittings
(c) marking requirements
(d) minimum requirements for casting quality and
materials
(e) dimensions and tolerances in SI (metric) and U.S.
Customary units
(f) threading requirements
(g) pressure test requirements
Mandatory Appendix I provides table values in U.S. Customary
units.
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 rounded as defined in
ASTM 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.
Relevant Units
This Standard states values in both SI (metric) and U.S.
Customary units. These systems of units are to be regarded
separately as the standard. Within the text the Customary units are
shown in parentheses or in separate tables in Mandatory Appendix I.
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.
Quality Systems
Requirements relating to the product manufacturer's Quality
System Programs are described in Nonmandatory Appendix A.
Denotation
Pressure Rating Designation.
Class, followed by a dimensionless number, is the designation
for pressure–temperature ratings (e.g., Class 125 and Class
250).
Size.
NPS, followed by a dimensionless number, is the designation for
nominal fittings size (e.g., NPS 2).
Time of Purchase, Manufacture, or
Intallation
The pressure–temperature ratings in this Standard are applicable
upon its publication to all fittings within its scope that
otherwise meet its requirements. For unused fittings maintained in
inventory, the manufacturer of the fittings may certify conformance
to this edition provided that it can be demonstrated that all
requirements of this edition have been met. Where such components
were installed in accordance with the pressure–temperature ratings
of an earlier edition of this Standard, those ratings are
applicable except as may be governed by the applicable code or
regulation.
User Accountability
This Standard cites responsibilities that are to be assumed by
the fitting user in the areas of the temperature at which the
pressure rating is taken.
Service Conditions
Criteria for selection of materials suitable for particular
fluid service are not within the scope of this Standard.
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