ASME B31.8a:2000 pdf free download

ASME B31.8a:2000 pdf free download.SUMMARY OF CHANGES.
It is intended that all materials and equipment that will become a permanent part of any piping system constructed under this Code shall be suitable and safe for the conditions under which they arc used. All such materials and equipment shall be qualified for the conditions of their use by compliance with certain specifications, standards, and special requirements of this Code, or otherwise as provided herein.
811 QUALIFICATION OF MATERiALS AND EQUIPMENT
111.1
Materials and equipment fall into the following six categories pertaining to methods of qualification for usc under this Code:
(a) items that conform to standards or specilications referenced in this Code
(b) items that are important from a safety standpoint. of a type for which standards or specifications are referenced in this Code hut specifically do not conform to a referenced standard. e.g.. pipe manufactured to a specification not referenced in the Code
(C) items of a type for which standards or specifications are referenced in this Code, hut that do not conform to the standards and are relatively unimportant from a safely standpoint because of their small size or because of the conditions under which they are to be used
(d) items of a type for which no standard or specification is referenced in this Code, e.g., gas compressor
(e) proprietary items (see definition. para. K04.l4)
(I) unidentified or used pipe
Prescribed procedures for qualifying each of thcse six categories are given in the following paragraphs.
841.112 Limitations on Specified Minimum Yield Strength S in Para. 841.11
(a) If the pipe under consideration is not new pipe purchased under a specification approved and listed in this Code. the value of S may be determined in accordance with one of the following:
(1) S value for new pipe qualified under para. 811.221 or 811.222
(2) S value for reuse of steel pipe qualified under one of thc provisions of para. 817.1
(3) S value for pipe of unknown specification as determined by pam. 817.13(h)
(b) When pipe that has been cold worked for meeting the specified minimum yield strength is subsequently heated to a temperature higher than 900F for any period of time or over 6(X)’F for more than I hr. the maximum allowable pressure at which it can be used shall not exceed 75% of the value obtained by use of the steel pipe design formula given in para. 841.11.
(c) In no case where the Code refers to the specified minimum value of a mechanical property shall the higher actual value of a property be substituted in the steel pipe design formula given in pam. 841.11. If the actual value is less than the specified minimum value of a mechanical property. the actual value may be used where it is permitted by the Code, such as in para. 817.1 regarding the reuse of steel pipe.
841.113 Additional Requirements for Nominal ‘all Thickness I in Para. 841.11
(a) The minimum wall thickness s required for pressure containment as determined by para. 841.11 may not be adequate for other forces to which the pipeline may be subjcctcd. ISce pam. 84O.la).J Consideration shall also be given to loading due to transportation or handling of the pipe during construction, weight of water during testing, and soil loading and other secondarv loads during operdlion. Consideration should also be given to welding or mechanical joining requirements. Standard wall thickness, as prescribed in ASME H36.1OM, shall be the least nominal wall thickness used for threaded and grooved pipe.
(b) Transportation. installinion. or repair of pipe shall not reduce the wall thickness at any point o a thickness less than 90% of the nominal wall thickness as determined by para. 841.11 for the design pressure to which the pipe is to be subjected.
84 1.114 Design Factors F and Location (lasses. The design factor in Table 841.1 l4A shall be used for the designated Location Class. All exceptions to basic design factors to be used in the design formula arc given in Table 841.1 14B.