Pipe joints or couplings – With indicator – alarm or inspection means
Patent
1995-11-16
1998-08-04
Arola, Dave W.
Pipe joints or couplings
With indicator, alarm or inspection means
285 98, 285106, 2851213, 285281, 285420, F16L 3500
Patent
active
057882886
ABSTRACT:
A dynamic sealing arrangement for connectors carrying high pressure fluids such as are used in the oil and gas industry for transferring production fluids from drilling installations to transport vessels. The sealing arrangement comprises a primary and a secondary U-shaped hydraulically operated sealing ring with open sides facing away from the junction of the connectors in the direction of the fluid leakage path. Barrier fluid under a pressure higher than that of the production fluid is supplied to the chamber between the sealing rings and independently to the open side of the secondary seal. The primary seal thus experiences a pressure differential and is activated. The secondary seal experiences a pressure differential and is activated only if the primary seal fails. Thus the secondary seal does not wear under normal usage of the connectors and is brought into operation automatically, efficiently and without delay when the primary seal is damaged. Substantial cost savings are achieved.
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Arola Dave W.
Framo Engineering AS
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