Pig drive, pig drive system and method of using same
AssigneeGrant Prideco, L.P.
InventorsRune Hostmark, Christian Holberg, Morten Martinsen
Life of this patent
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Abstract
A pig drive, a pig drive system for feeding a pig into a pig kicker section of a pipe, and a method for feeding the pig into the pig kicker section of the pipe are disclosed. The pig drive includes: a piston with a radial direction and an axial direction; a rod connected to the piston and extending in the axial direction of the piston, wherein the rod has a distal end adapted to interface the pig; a retainer slidably connected to the rod and adapted to interface a retainer abutment; and a biasing device arranged to bias the retainer towards the distal end of the rod.
Claims13
A pig drive for feeding a pig into a pig kicker section of a pipe, the pig drive being configured to be introduced into a cylinder, the cylinder being adapted to house the pig drive and the pig, and the pig drive comprising:
- a piston with a radial direction and an axial direction;
- a rod connected to the piston and extending in the axial direction of the piston, wherein the rod has a distal end adapted to interface the pig;
- a retainer slidably connected to the rod, configured to move in the cylinder and adapted to interface a retainer abutment, wherein the retainer comprises at least one through hole for pressure equalization;
- and
- a biasing device arranged to bias the retainer towards the distal end of the rod.
Dependencies are inferred from the claim text.