Wellheads | 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" |