ASME B16.14 pdf download Ferrous Pipe Plugs, Bushings, and Locknuts With Pipe Threads
This Standard covers the following:
(a) pressure–temperature ratings
(e) dimensions and tolerances
(g) pattern taper
Standards and specifications adopted by reference are shown in Mandatory Appendix II. It is not considered practical to identify the edition of each referenced stan- dard and specification in the text. Instead, the editions of the referenced standards and specifications are listed in Mandatory Appendix II. 2.2 Quality Systems Requirements relating to the product manufacturer’s quality system programs are described in Nonmandatory Appendix A.
2.3 Relevant Units This Standard states values both in metric units and U.S. Customary units. These systems of units are to be regarded separately. The U.S. Customary units are shown in parentheses or in separate tables. The values in these separate tables are not exact equivalents; there- fore, 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.
2.4 Service Conditions Criteria for selection of materials suitable for particular fluid service are notwithin the scope ofthis Standard.
2.5 Convention For determining conformance with this Standard, the convention for fixing significant digits where limits and maximum and minimum values are specified shall be rounded as defined in ASTM E 29. This requires that an observed or calculated value shall be rounded 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.
2.6.1 Pressure Rating Designation. Class followed by a dimensionless number is the designation for pressure–temperature ratings.
2.6.2 Size. Nominal pipe size (NPS) followed by a dimensionless number is the designation for nominal flange or flange fitting size. NPS is related to the refer- ence nominal diameter, DN, used in international stan- dards. The relationship is, typically, as follows:
For NPS ≥ 4, the related DN p 25 ( )SPN؋
3 PRESSURE–TEMPERATURE RATINGS
(a) Pressure–temperature ratings for plugs and bush- ings shall be in accordance with ASME B16.4 if made of cast iron, or ASME B16.3 if made of malleable iron, ductile iron, or steel. Use of cored plugs or hexagon head bushings should be limited to Class 125 cast iron and Class 150 malleable iron threaded fittings. Solid plugs and face bushings are recommended for use with Class 250 cast iron fittings and Class 300 malleable iron fittings.
(b) Locknuts are not pressure–temperature rated.
4 NOMINAL PIPE SIZE
As applied in this Standard, the use of the phrase “nominal pipe size” or the designation NPS followed by a dimensionless number is for identifying the end connection of fittings. The number is not necessarily the same as the fitting inside diameter.