API SPEC 6D:2009 pdf download

API SPEC 6D:2009 pdf download.Specification for Pipeline Valves.
The allowable stress values shall be consistent with the selected design code or standard.
If the selected design code or standard specifies a test pressure less than 1,5 times the design pressure, then the design pressure for the body calculation shall be increased such that the hydrostatic test pressure in 11.3 can be applied.
NOTE 2 Some design codes or standards require a consistent and specific application of requirements for fabrication and testing, including NDE.
7.2 Pressure and temperature rating
The nominal pressure (PN) class or the ASME rating class shall be used for the specification of the required pressure class.
Valves covered by this International Standard shall be furnished in one of the following classes:
— PN 20 (class 150):
— PN 50 (class 300); PN 64 (class 400):
PN 100 (class 600):
— PN 150 (class 900); PN 250 (class 1500):
PN 420 (class 2500).
Pressure-temperature ratings for class-rated valves shall be in accordance with the applicable rating table for the appropriate material group in ASME B16.34.
Pressure-temperature ratings for PN-rated valves shall be in accordance with the applicable rating table for the appropriate material group in EN 1092-1.
If intermediate design pressures and temperatures are specified by the purchaser, the pressure-temperature rating shall be determined by linear interpolation.
Pressure-temperature ratings for valves made from materials not covered by ASME B16.34 and EN 1092-1 shall be determined from the material properties in accordance with the applicable design standard. NOTE Non-metallic parts can limit maximum pressures and minimum and maximum operating temperatures.
The maximum operating pressure at the minimum and maximum operating temperatures shall be marked on the nameplate.
7.3 Sizes
Valves constructed to this International Standard shall be furnished in nominal sizes as listed in Table 1.
NOTE In this International Standard, DN sizes are stated first followed by the equivalent NPS size between brackets.
Except for reduced-opening valves, valve sizes shall be specified by the nominal sizes (DN) or nominal pipe size (NPS).
Reduced-opening valves with a circular opening shall be specified by the nominal size of the end connections and the nominal size of the reduced opening in accordance with Table 1.
EXAMPLE I A DN 400 — PN 20 valve with a reduced 303 mm diameter circular opening shall be specified as DN 400 (NPS 16) x DN 300 (NPS 12).
Reduced-opening valves with a non-circular opening and reduced-opening check valves shall be designated as reduced-bore valves and specified by the nominal size corresponding to the end connections followed by the letter ‘R”.
EXAMPLE 2 Reduced-bore valve with DN 400 (NPS 16) end connections and a 381 mm x 305 mm rectangular opening shall be specified as 400R.
7.4 Face-to-face and end-to-end dimensions
Unless otherwise agreed, face-to-face (A) and end-to-end (B and C) dimensions of valves shall be in accordance with Tables 2 to 6; see Figures Ito 13 for diagrams of dimensions A, B and C.
Face-to-face and end-to-end dimensions for valve sizes not specified in Tables 2 to 6 shall be in accordance with ASME B16.I0. Face-to-face and end-to-end dimensions not shown in Table 2 to Table 6 or in ASME B16.I0 shall be established by agreement.
The length of valves having one welding end and one flanged end shall be determined by adding half the length of a flanged-end valve to half the length of a welding-end valve.
Tolerances on the face-to-face and end-to-end dimensions shall be ± 2 mm for valve sizes DN 250 (NPS 10) and smaller, and ± 3 mm for valve sizes DN 300 (NPS 12) and larger.
The nominal size and face-to-face or end-to-end dimensions shall be stated on the nameplate if not specified in, or not in accordance with, Tables 2 to 6.