ASME B16.3:2006 pdf download Malleable Iron Threaded Fittings Classes 150 and 300
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1.1 General
This Standard covers malleable iron threaded fittingsClasses 150 and 300.It also contains provisions for usingsteel for caps and couplings in Class 150 for NPS andsmaller. This Standard includes
(a) pressure-temperature ratings(b) size and method of designating openings of reduc-ing fittings(c) marking(d) material(e) dimensions and tolerances(/) threading(g) coatingsMandatory Appendix I provides table values in USCustomary units.
1.2 References
Standards and specifications adopted by reference inthis Standard are shown in Mandatory Appendix Il. Iis not considered practical to identify the specific editionof each referenced standard and specification in the text.Instead, the specific editions of the referenced standardsand specifications are listed in Mandatory Appendix Il
1.3 Quality Systems
Requirements relating to the product manufacturersQuality System Programs are described in Nonmanda-tory Appendix A.
1.4 Relevant Units
This Standard states alues in both metric and USCustomary units.These systems of units are to beregarded separately. Within the text, the U.S Customaryunits are shown in parentheses or in separate tablesThe values stated in each table are not exact equivalentstherefore, it is required that each system of units be usedindependently of the other. Combining values from thetwo systems constitutes nonconformance with thisStandard.
1.5 Service Conditions
Criteria for selection of materials suitable for particular fluid service are not within the scope of this Standard.
1.6 Convention
For the purpose of determining conformance withthis Standard, the convention for fixing significant digitswhere limits (maximum and minimum values) are speci-fied, shall be rounded as defined in ASTM E 29. Thisrequires that an observed or calculated value shall berounded off to the nearest unit in the last right handdigit used for expressing the limit. Decimal values andtolerance do not imply a particular method of mea-surement.
1.7 Denotation
1.7.1 Pressure Rating Designation. Class, followedby a dimensionless number, is the designation for pres-sure-temperature ratings as follows: Class 150; Class300.
1.7.2 Size.NPS, followed by a dimensionless num-ber, is the designation for nominal fitting size. NPS isrelated to the referenced nominal diameter, DN, usedin international standards. The relationship is, typicallyas follows:
GENERAL NOTE: For NPS 24, the related DN s: DN = 25 X(NPS).
2PRESSURE-TEMPERATURE RATINGS
(a) Pressure-temperature ratings for these fittings areshown in Tables 1 and I-1.
(b) All ratings are independent of the contained fluidand are the maximum allowable working gauge pres-sures at the tabulated temperatures. Intermediate rat-ings may be obtained by linear interpolation betweenthe temperatures shown.
(c) The temperatures shown for the correspondingpressure rating shall be the material temperature of thepressure-retaining structure. It may be assumed that the