API 6D:2002 free download

API 6D:2002 pdf download.Petroleum and Natural Gas Industries- Pipeline Transportation Systems-
Pipeline Valves.
6.2 Sizes
All valves, except for reduced-opening valves, shall be furnished in the nominal sizes (ON) listed in Tables 2 to 6 Reduced-opening valves shall be furnished in the nominal sizes in accordance with 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 (ON) or nominal pipe size
(N PS).
Reduced-opening valves with a circular opening through the obturator shall be specified by the nominal size of the end connections and the nominal size of the mwwmum bore of the obturator ii accordance with Table 1, except that for valve sizes DN 50 (NPS 2) or smaller the actual bore of the obturator shall be specified. For example, a DN 400 valve with a reduced 334-mm-diameter circular opening through the obturator shall be specified ac 400 x 350
Reduced-opening valves with a non-circular opening through the obturator and reduced-opening check valves shall be designated reduced-bore valves and specified by the nominal size corresponding to the end connections followed by the letter MR”. For example, a reduced-bore valve with ON 400 end connections and a 381 x 305 mm rectangular opening through the obturator shall be specified as 400R.
6.3 Face-to–face and end-to-end dimensions
Unless otherwise agreed, lace-to-face and end-to-end dimensions of valves shall be in accordance with Tables 2 to 6.
Face-to-face and end-to-end dimensions for valve sizes not specified in Tables 2 to 6 shall be in accordance with ASME B1610. Face-to-face and end-to-end dimensions not shown in Tables 2to 6 or in ASME B1610 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 and smaller. and ±3 mm for valve sizes ON 300 and larger
The nominal size and face-to-face or end-to-end dimensions shall be stated on the nameplate if not specified wi or not in accordance with Tables 2 to 6.