MSS SP-44-2016 Historical

SCOPE

1.1 General This Standard Practice covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for steel pipeline flanges. The welding neck type flanges shall be forged steel, and the blind flanges may be made from either forged steel or from steel plate.

1.1.1 Dimensional and tolerance requirements for NPS 10 and smaller are provided by reference to ASME B16.5. When such flanges are produced from materials meeting Table 2 requirements, and meet all other stipulations of this Standard Practice, then they shall be considered as complying therewith.

1.2 References

1.2.1 Referenced Standards Standards and specifications adopted by reference in this Standard Practice are shown in Annex E, for convenience of identifying edition number, date, and source of supply.

A flange made in conformance with a prior edition of referenced standards and in all other respects conforming to this Standard Practice, will be considered to be in conformance even though the editino reference may have been changed in a subsequent revision of this Standard Practice.

1.2.2 Codes and Regulations A flange used under the jurisdiction of the ASME Boiler and Pressure Vessel Code, the ANSI-approved Code for Pressure Piping, or Governmental Regulations, is subject to any limitation of that code or regulation. This includes any maximum temperature limitation for a material, or rule governing the use of a material at a low temperature.

1.3 Relevant Units This Standard Practice states values in both SI (metric) and U.S. Customary units. As an exception, diameter of bolts and flange bolt holes are expressed in inch units (U.S. Customary) only. These systems of units are to be regarded separately as the standard and cannot be combined.

Within the text, the U.S. Customary units are shown in parentheses, combined tables, or in separate tables. The values and tolerances stated in each system are not exact equivalents; therefore it is required that each system of units be used independently of the other. Except for diameter of bolts and flange bolt holes, combining values from the two systems constitutes nonconformance with the Standard Practice.