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When a double asterisk appears after the
"Matching pipe size", it indicates that WOODCO USA
recommends a heavier pipe schedule than that specified by
API. |
All API Specified
6B Weld Neck
Flanges have restricted bores to match standard pipe sizes and
schedules. API Spec 6A does not provide specifications for 6B Weld
Neck Flanges in sizes above 11” nominal, WOODCO USA shows 6B “type”
Weld Neck Flanges in sizes above 11” because operators request these flanges.
All Weld Necks shown have a minimum wall thickness of .200 inches,
which in some cases exceeds API requirements. See
Weld Neck Flanges section of this Web Site for more
information.
Click here to find Carbon Steel Pipe Dimensions to match Flange
Weld Necks other than those shown.
Note: API Spec 6A does not specify
Over All Length of 6BX Weld Neck Flanges, but instead provides
dimensions of specific portions of the flange, with tolerance, that
manufacturers must add together, along with an undefined weld bevel,
to achieve a length. Consider any length for API 6BX Weld Neck
Flanges shown on this website as an approximate length. When API
Spec 6A provides no weld neck data for a specific 6BX flange, WOODCO
USA has concluded that operators will not choose to make a field
weld attachment of that flange and suggests no weld neck dimensions.
API Spec 6A
Specified, 6 BX Weld Neck Flanges, have material and dimensions that
conform to the requirements for full bore
Integral flanges.
For information about full
bore API 6B weld neck flanges, made to integral flange
specifications, Click Here.
To view cautions about Series 2900 Weld Neck Flanges,
Click Here.
To view cautions about 6BX Weld Neck Flanges,
Click Here.
To learn more about Weld Neck Flanges,
Click Here.
To View Carbon Steel Pipe Dimensions and Weights,
Click Here.
To
Calculate Working Pressure for API 5L Line Pipe,
Click Here.
FULL BORE WELD NECK FLANGES
Manufacturers may also make
API 6B Weld Neck Flanges to Integral flange specifications for the
purpose of attaching the flanges to bodies of equipment by welding,
thus making them integral to that equipment. These flanges, made to
integral flange specifications, may also be sold as “Full Bore Weld
Neck Flanges” intended for attachment to equipment or tubular
members by the purchaser. These “Loose” integral flanges require
that the purchaser use the same
Qualified Welding
Procedures and Post Weld Heat
Treatment as that used to manufacture any new equipment having
integral flanges attached by welding. The “full bores” of these
flanges may not match any commonly available pipe size, as the neck
O.D.’s and weld preparations must satisfy API Spec 6A stress allowables. API Spec 6A requires that all integral flanges attached
by welding shall have
Full Penetration
Welds.
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