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ASME B16.9 Document Information:
Title
Factory-Made Wrought Buttwelding Fittings
ASME International
Publication Date:
Dec 7, 2007
Scope:
General
This Standard covers overall dimensions, tolerances, ratings,
testing, and markings for factory-made wrought buttwelding fittings
in sizes NPS 1/2 through NPS 48 (DN 15 through DN 1200).
Special Fittings
Fittings may be made to special dimensions, sizes, shapes, and
tolerances by agreement between the manufacturer and the
purchaser.
Fabricated Fittings
Fabricated laterals and other fittings employing circumferential
or intersection welds are considered pipe fabrication and are not
within the scope of this Standard. Fabricated lap joint stub ends
are exempt from the above restrictions, provided they meet all the
requirements of the applicable ASTM material specification listed
in section 5.
Standard Units
The values stated in either metric or U.S. Customary units are
to be regarded separately as standard. Within the text, the U.S.
Customary units are shown in parentheses. 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 this Standard. The
designation for size is NPS for both metric- and
customary-dimensioned fittings. Fitting pressure rating is
associated with the connecting wall thickness of pipe of equivalent
size and material.
References
Referenced Standards.
Standards and specifications adopted by reference in this
Standard are shown in Mandatory Appendix II. It is not considered
practical to identify the specific edition of each standard and
specification in the individual references. Instead, the specific
edition reference is identified in Mandatory Appendix II. A product
made in conformance with a prior edition of referenced standards
and in all other respects conforming to this Standard will be
considered to be in conformance.
Codes and Regulations. A fitting used under the
jurisdiction of the ASME Boiler and Pressure Vessel Code, the ASME
Code for Pressure Piping, or a governmental regulation is subject
to any limitation of that code or regulation. This includes any
maximum temperature limitation, or rule governing the use of a
material at low temperature.
Service Conditions
Criteria for selection of fitting types and materials suitable
for particular fluid service are not within the scope of this
Standard.
Welding
Installation welding requirements are outside the scope of this
Standard.
Quality Systems
Nonmandatory requirements relating to the fitting 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) are specified shall be rounded off 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 righthand digit used
in expressing the limit. Decimal values and tolerances do not imply
a particular method of measurement.
Pressure Rating Designation
Class, followed by a dimensionless number, is the designation
for pressure–temperature ratings. Standardized designations for
flanges per ASME B16.5 referenced in this Standard are Classes 150,
300, 600, 900, 1500, and 250
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