API API STD 602 pdf download Gate, Globe, and Check Valves for Sizes DN 100 (NPS 4) and Smaller for the Petroleum and Natural Gas Industries
ASME Boiler and Pressure Vessel Code (BPVC), Section lX: Welding and Brazing Qualifications
ASTM A217,2Standard Specification for Steel Castings，Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service
ASTMA307,Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60,000 PSI TensileStrength
ISO 5752,3 Metal valves for use in flanged pipe systems—Face-to-face and centre-to-face dimensionsISO 15649,Petroleum and natural gas industries—Piping
MsS SP-117,4Bellows Seals for Globe and Gate Valves
NACE MR 0103,5Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum RefiningEnvironments
Terms and Definitions
For the purposes of this document, the following definitions apply.3.1
An alphanumeric designation that is used for reference purposes relating to valve pressure/temperaturecapability, taking into account valve material mechanical properties and valve dimensional characteristics.lt comprises the word “Class” followed by a dimensionless whole number. The number following “Class”do not represent a measurable value and are not used for calculation purposes, except where specified inthis standard. The allowable pressure for a valve having a class number depends on the valve materialand its application temperature, and is to be found in tables of pressure/temperature ratings.
An alphanumeric designation of size that is common for components used in a piping system, used forreference purposes, comprising the letters “DN” followed by a dimensionless number indirectly related tothe physical size of the bore or outside diameter of the end connection as appropriate.The dimensionlessnumber following “DN” does not represent a measurable value and is not used for calculation purposes,except where specified in this standard.
nominal pipe sizeNPS
An alphanumeric designation of size that is common for components used in a piping system, used forreference 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 dimensionlessnumber may be used as a valve size identifier without the prefix“NPs.” ‘The dimensionless sizeidentification number does not represent a measurable value and is not used for calculation purposes.
The pressure/temperature ratings applicable to valves specified in this standard shall be in accordancewith those specified in the tables of ASME B16.34 for standard class for the applicable materialspecification and class designation.
4.1.2Applicable Valve Materials
Not all materials contained in ASME B16.34 are applicable to this standard.The acceptable forging andcasting construction materials for ASME B16.34 Material Group 1,Material Group 2, and Material Group3 are listed in Table 1a,Table 1b, and Table 1c, respectively.The Table 1a, Table 1b, and Table 1c notesapply to the applicable valve material where noted.
The pressure/temperature ratings for Intermediate class 800 valves shall be as shown in Table 2a,Table2b, Table 2c, Table 2d, Table 2e, and Table 2f.The pressure/temperature ratings in Table 2a, Table 2b,Table 2c, Table 2d,Table 2e, and Table 2f are a linear interpolation of Standard class 600 and Standardclass 900 pressure/temperature ratings listed in ASME B16.34 for the appropriate valve material.