ASME B16.32 pdf download

ASME B16.32 pdf download.Valves -Flanged,Threaded, and Welding End.
This Standard applies to new construction and covers pressure—temperature ratings, dimensions, tolerances, materials, nondestructive examination requirements. testing, and marking for cast, forged, and fabricated flanged, threaded, and welding end and wafer or flangeless valves of steel, nickel-base alloys, and other alloys shown in Table 1. Wafer or flangeless valves, bolted or through. bolt types, that are installed between flanges or against a flange are treated as flanged-end valves. Alternative rules for NPS 2’/2 and smaller valves are given In Mandatory Appendix V.
1.2 ApplicabiUty
1.2.1 Standards and Specifications. Standards and specifications adopted by reference in this Standard and the names and addresses of the sponsoring organizations are shown in Mandatory Appendix VII. It is not considered practical to refer to a specific edition of each of the standards and specifications in the individual clause references. Instead, the specific edition references are included in Mandatory Appendix VII. A product made In conformance with a prior edition of reference standards and in all other respects conforming to this Standard shall be considered to be in conformance even though the edition reference may have been changed in a subsequent revision of this Standard.
1.2.2 Time of Purchase, Manufacture, or InstaLlation. The pressure-temperature ratings included in this Standard are applicable, upon publication, to all valves covered within its scope that meet its requirements. For unused valves, valves that have been maintained in inventory, the manufacturer may certify conformance to this edition provided that it can be demonstrated that all requirements of this edition have been met. However, where such components were installed under the pressure— temperature ratings of an earlier edition of ASME B16.34, those ratings shall apply except as may be governed by an applicable Code or reguLation.
1.2.3 User AccountabiLity. This Standard cites duties and responsibiIites that are to be assumed by the valve user in the areas of, for example, application, Installation, system hydrostatic testing, operation, and material selection.
4.4.2 CompLiance. The B16.34° identification marking olpara. 4.4.1 designates that the valve was manufactured In conformance with ASME B16.34.
5 MATERIALS
5.1 GeneraL
The body, bonnet or cover, body joint bolting, and body- bonnet or cover bolting shall be constructed of materials as listed in the respective ASTM specifications referred to in Table 1. Identical materials in accordance with ASME BPVC, Section II may also be used for these parts.
5.1.1 AppLication. It Is not required that identical mate- hal or material form be used for body and bonnet or cover parts. The rating applied, however, shall be based on the valve body. The bonnet or cover shall be designed and material selected so as to comply with the body pressure-temperature rating. Selection of stems, disks, and other parts, such as bonnet gaskets and bolting, subject to pressure and other loading, must be consistent with the applicable valve pressure-temperature rating.
5.1.2 Carbon SteeL Bonnet or Cover BoLting, It Is permissible to use carbon steel, for example, ASTM A307. Grade B, for bonnet or cover bolting only for Class 300 and lower, provided the service temperature is limited to 200°C (400°F) and marking is in accordance with para. 4.3.3.
5.1.3 Investment Castings. When investment castings are used for bodies, bonnets, or cover plates of valves NI’S 4 and smaller where the ratings do not exceed Class 600, the requirements of the ASTM specifications referred to in Table 1 shall be met, except that it is permissible to determine mechanical and chemical properties from a master heat and to use a 25mm gage length 6.25mm diameter (1 in. x 0.25 in. diameter) tensile specimen in place of the standard 2 in. tensile specimen. A master heat is previously refined metal of a single furnace charge. Tensile specimens shall be cast in molds of the same refractory as the castings and shall be given the same heat treatment as the castings. When investment castings are used for sizes and pressure classes greater than those described in this paragraph, all the requirements of the applicable material specification listed in Table 1 shall be met.