Patent ID: RE42358

Claim:
A method of cleaning and , dewatering, or hydrostatic testing a pipeline between two subsea manifolds, one of said manifolds having a subsea pig launcher/receiver with a pig and the other having a subsea pig receiver comprising: providing a fill and test package comprising one or more pumps mounted on the test and fill package wherein the test and fill package mounted pump or pumps are dimensioned for cleaning, dewatering, and pressurizing to a sufficiently high pressure for hydrostatic pipeline testing; using a submersible vehicle (SV) to deploy the fill and test package to one of the subsea manifolds; using a submersible vehicle (SV) the SV to operate one or more pumps on a the fill and test package to force seawater behind said pig and move the pig from the pig launcher/receiver to the pig receiver; and using said SV to pump more water into said pipeline to a test pressure and maintaining said pressure that there are no leaks in said pipeline supply power to at least one of the one or more pumps for cleaning, dewatering, or hydrostatic testing of the pipeline .