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ASTM A420 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service
1.SCOPE
1.1 This specification2 covers wrought carbon steel and alloy steel fittings of seamless and welded construction, covered by the latest revision of ASME B 16.9, ASME B 16.11, MSS-SP-79, MSS-SP-83, and MSS-SP-95. Fittings differing from these ASME and MSS standards shall be furnished in accordance with Supplementary Requirement S58 of Specification A 960/A 960M. These fittings are for use in pressure piping and pressure vessel service at low temperatures.
1.2 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. When desired, one or more of these supplementary requirements shall be specified in the order.
1.3 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.
1.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other.
2.Referenced Documents
2.1 In addition to those Referenced Documents listed in Specification A 960/A 960M, the following list of standards apply to this specification.
2.2 ASTM Standards: 3
A 370 Test Methods and Definitions for Mechanical Testing of Steel Products
A 960/A 960M Specification for Common Requirements for Wrought Steel Piping Fittings
2.3 ASME Standards:
B 16.9 Factory-Made Wrought Steel Butt-Welding Fittings4
B 16.11 Forged Steel Fittings, Socket-Welding Threaded4
Section VIII Division 1, Pressure Vessels4
Section IX Welding Qualifications
2.4 MSS Standards:
MSS-SP-25 Standard Marking System for Valves, Fittings, Flanges, and Unions5
MSS-SP-79 Socket Welding Reducer Inserts5
MSS-SP-83 Steel Pipe Unions, Socket-Welding and Threaded5
MSS-SP-95 Swage(d) Nipples and Bull Plugs5
2.5 ASNT Standards:
SNT-TC-1A Recommended Practice for Nondestructive Testing Personnel Qualification and Certification.
3. Ordering Information
3.1 See Specification A 960/A 960M.
4. General Requirements
4.1 Product furnished to this specification shall conform to the requirements of Specification A 960/A 960M, including any supplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements of Specification A 960/A 960M constitutes nonconformance with this specification. In case of conflict between the requirements of this specification and Specification
A 960/A 960M, this specification shall prevail.
5. Material
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