API 600-2009 pdf download.Steel Gate Valves—Flanged and Butt-welding Ends, Bolted Bonnets.
ASME B1 .20.1, Pipe Threads, General Purpose (Inch) ASME B16.5, Pipe Flanges and Flanged Fittings NPS 1/2 through NPS 24 Metric/Inch ASME B16.1 0, Face-to Face and End-to-End Dimensions of Valves ASME B1 6.11, Forged Steel Fittings, Socket-Welding and Threaded ASME B1 6.25, Buttwelding Ends ASME B16.34, Valves—Flanged, Threaded and Welding End ASME B18.2.2, Square and Hex Nuts (Inch Series) ASME B1 220.127.116.11M, Metric Heavy Hex Nuts ASME B36.1 0M, Welded and Seamless Wrought Steel Pipe ASME Boiler and Pressure Vessel Code (BPVC), Section IX: Welding and Brazing Qualifications ASTM A1 93 2 , Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High Temperature of High Pressure Service and Other Special Purpose Applications ASTM A194, Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both ASTM A307, Standard Specification for Carbon Steel Bolts and Studs, 60 000 PSI Tensile Strength EN 1092-1 3 , Flanges and their joints—Circular flanges for pipes, valves, fittings and accessories, PN designated— Part 1: Steel flanges ISO 7-1 4 , Pipe threads where pressure-tight joints are made on the threads—Part 1: Dimensions, tolerances and designation ISO 5210, Industrial valves—Multi-turn valve actuator attachments ISO 5752, Metal valves for use in flanged pipe systems—Face-to-face and centre-to-face dimensions ISO 6708, Pipework components—Definition and selection of DN (nominal size) ISO 9606-1 , Approval testing of welders—Fusion welding—Part 1: Steels ISO 15607, Specification and qualification of welding procedures for metallic materials—General rules ISO 15649, Petroleum and natural gas industries—Piping MSS SP-55 5 , Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components — Visual Method for Evaluation of Surface Irregularities
3 Definitions 3.1 Class An alphanumeric designation that is used for reference purposes relating to valve pressure/temperature capability, taking into account valve material mechanical properties and valve dimensional characteristics. It comprises “Class” followed by a dimensionless whole number. The number following “Class” does not represent a measurable value and is not used for calculation purposes except where specified in this International standard. The allowable pressure for a valve having a class number depends on the valve material and its application temperature and is to be found in tables of pressure/temperature ratings. 3.2 DN An alpha numeric designation of size that is common for components used in a piping system, used for reference purposes, comprising the letters “DN” followed by a dimensionless number indirectly related to the physical size of the bore or outside diameter of the end connection as appropriate. The dimensionless number following “DN” does not represent a measurable value and is not used for calculation purposes except where specified. 3.3 NPS An alpha numeric designation of size that is common for components used in a piping system, used for reference purposes, comprising the letters “NPS” followed by a dimensionless number indirectly related to the physical size of the bore or outside diameter of the end connection as appropriate. The dimensionless number may be used as a valve size identifier without the prefix “NPS.” The dimensionless size identification number does not represent a measurable value and is not used for calculation purposes. 4 Pressure/Temperature Ratings 4.1 Pressure/temperature ratings shall be in accordance with those specified in the tables of ASME B1 6.34 for standard class for the applicable material specification and the applicable class.
4.2 Restrictions of temperature and concurrent pressure, or pressure and concurrent temperature, (e.g. those imposed by special soft seals or special trim materials), shall be marked on the valve identification plate (see Section 8). 4.3 The temperature for a corresponding pressure rating is the maximum temperature of the pressure-containing shell of the valve. In general, this temperature is the same as that of the contained fluid. The use of a pressure rating corresponding to a temperature other than that of the contained fluid is the responsibility of the user. 4.4 For temperatures below the lowest temperature listed in the pressure/temperature tables the service pressure shall be no greater than the pressure for the lowest listed temperature. The use of valves at lower temperatures is the responsibility of the user. Consideration should be given to the loss of ductility and impact strength of many materials at low temperature. 4.5 Double seated valves, in some design configurations, may be capable of trapping liquid in the center cavity of the valve when in the closed position. If subjected to an increase in temperature, an excessive build-up of pressure can occur, which may result in a pressure boundary failure. Where such a condition is possible, it is the responsibility of the user to provide or require to be provided, means in design, installation, or operating procedure, to assure that the pressure in the valve does not exceed that allowed by this International standard for the resultant temperature.