Method and apparatus for launching a pig in a vertical riser pip

Details Method and apparatus for launching a pig in a vertical riser pip Method and apparatus for launching a pig in a vertical riser pip

1997-09-19

1999-10-19

Bagnell, David J.

Hydraulic and earth engineering

Marine structure or fabrication thereof

Structure protection

15104061, B08B 100

Patent

active

059676990

ABSTRACT:
A tension leg platform in deep water over an underwater wellhead system supports an upstanding pig riser. The riser ID is smaller than the shoreline ID delivering produced oil to shore. The shoreline is pigged by a tapered nose pig inserted into the bell nipple at the top, open end to enable pig passage down the riser compressing the pig body. The body is formed of N discs and N foam donut spacers to clean the shoreline ID.

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patent: 5795402 (1998-08-01), Hargett, Sr. et al.
patent: 5814160 (1998-09-01), Orlando

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