Patent ID: 6860525

Claim:
A pipe assembly for oil and gas production from a subsea well, comprising: a first pipe segment having an axial bore and a plurality of external threads and a rim; a second pipe segment having an axial bore and a plurality of external breech threads extending in an opposite direction to the external threads of the first pipe segment, the second pipe segment having a rim that engages the rim of the first pipe segment; a coupling nut having a first portion with a plurality of internal threads that matingly engage the external threads of the first pipe segment and a second portion with a plurality of internal breech threads that matingly engages the external breech threads of the second pipe to secure the pipe segments to each other; a seal sub that sealingly engages an interior surface of the first pipe segment and an interior surface of the second pipe segment when the rims of the first and second pipe segments engage each other; and a retainer that engages an outer surface of the seal sub and one of the first and second pipe segments to hold the seal sub relative to said one the first and second pipe segments when the rims of the first and second pipe segments are not engaging each other.