Patent ID: 8398825
Filing Date: 2013-03-19
Classification: C10B

Abstract:
1. A remotely operated mode shifting apparatus for selectively routing decoking fluid between a cutting nozzle and a drilling nozzle of a fluid jet decoking tool, said apparatus comprising: a body configured to be coupled to said decoking tool; a shifting mechanism disposed in said body and rotatably and translationally responsive to changes in pressure of a decoking fluid such that in a first operating condition, said apparatus is cooperative with said decoking tool to establish a drilling mode with said drilling nozzle, while in a second operating condition, said apparatus is cooperative with said decoking tool to establish a cutting mode with said cutting nozzle; and at least one set of tandem seals disposed along an interface formed by at least one of (a) adjacent components within said apparatus that are moveable relative to one another and (b) adjacent components between at least a portion of said shifting mechanism and said decoking tool that are movable relative to one another, said at least one set of tandem seals and said interface cooperative such that at least one seizure-sensitive component within said apparatus is redundantly isolated from a pressurized decoking fluid in said decoking tool.