Wellheads | Pack-off Flanges

Pack-off Flanges
Destination:

Pack-off flanges are usually used as a cross-over connection to adapt flanges of different pressure ratings or sizes and provide an extra safety seal of the casing.
There are pack-off flanges provided with one seal, recommended for pressures up to 5,000 PSI (350 bar) and pack-off flanges with two seals, recommended for pressures up to 15,000 PSI (1050 bar).
About Material class and Temperature classification, see Appendix A.
The type of Pack-off flange depends on the seal used in it.

Pack-off flanges with one seal

Bottom flange,
(in x psi)
Top flange,
(in x psi)
Casing pack-off size,
( in )
Height,
( in )
9" x 2,000 9" x 3,000 4 1/2" 4 1/2"
9" x 2,000 9" x 3,000 5 1/2" 4 1/2"
11" x 2,000 11" x 3,000 5 1/2" 4 1/2"
11" x 2,000 11" x 3,000 7" 4 1/2"
11" x 3,000 7 1/16" x 5,000 7" 5"
11" x 3,000 11" x 3,000 5 1/2" 3 3/8"
11" x 3,000 11" x 5,000 7 5/8" 5 11/16"
11" x 5,000 11" x 5,000 5 1/2" 4 13/16"
11" x 5,000 11" x 5,000 7" 4 13/16"
13 5/8 x 3,000 11" x 5,000 8 5/8" 5 11/16"
13 5/8 x 3,000 13 5/8" x 5,000 9 5/8" 5 1/2"
13 5/8" x 5,000 11" x 5,000 7" 6 13/32"
13 5/8" x 5,000 13 5/8" x 5,000 9 5/8" 4 9/16"
16 3/4" x 3,000 11" x 5,000 10 3/4" 5 5/8"

Pack-off with two seals

Bottom flange,
(in x psi)
Top flange,
(in x psi)
Casing pack-off size,
( in )
Height,
( in )
11" x 5,000 9" x 10,000 7 5/8" 4 7/8"
11" x 5,000 7 1/16" x 10,000 5 1/2" 4 7/8"
11" x 5,000 9" x 10,000 7 3/4" 4 7/8"
11" x 5,000 7 1/16" x 10,000 7" 4 7/8"
11" x 5,000 11" x 10,000 7" 5 11/16"
11" x 5,000 9" x 10,000 7" 6"
11" x 10,000 7 1/16" x 10,000 7" 6"
11" x 10,000 9" x 10,000 7 5/8" 6"
11" x 10,000 9" x 10,000 7" 6"
13 5/8" x 3,000 11" x 10,000 9 5/8" 6"
13 5/8 x 5,000 13 5/8" x 10,000 9 5/8" 7 1/2"
13 5/8" x 5,000 11" x 5,000 7 5/8" 6 13/32"
13 5/8" x 5,000 11" x 5,000 7" 6 13/32"
13 5/8" x 5,000 11" x 5,000 8 5/8" 6 13/32"
13 5/8" x 5,000 11" x 10,000 7" 7"
16 3/4" x 5,000 16 3/4" x 5,000 11 3/4" 5 1/4"
16 3/4" x 5,000 13 5/8" x 10,000 11 3/4" 5 1/4"
16 3/4" x 5,000 13 5/8" x 10,000 10 3/4" 5 1/4"
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