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A method and a device for replacing a seal element in an undersea blowout preventer is provided. A complete system includes a control center on the surface, an umbilical from the control center to a remotely operated vehicle (ROV), and a seal element carrier manipulated by the ROV. The carrier inclu

A method and a device for replacing a seal element in an undersea blowout preventer is provided. A complete system includes a control center on the surface, an umbilical from the control center to a remotely operated vehicle (ROV), and a seal element carrier manipulated by the ROV. The carrier includes either retrieving tool or a running tool, which retains a cartridge which is to be inserted into or has been retrieved from a BOP. The cartridge is split along a vertical plane, with each half of the cartridge becoming a temporarily integral part of a pipe ram on either side of the BOP. Alignment ramps on the cartridge mate with complementary surfaces on the respective faces of the pipe rams.

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[ I claim:] [1.] A blowout preventer comprising:a. a housing with a bore extending through the housing defining a bore axis;b. a chamber extending laterally of the bore and communicating with the bore;c. a ram in the housing;d. a cartridge means releasably mountable to the ram;e. a ram cylinder exte

[ I claim:] [1.] A blowout preventer comprising:a. a housing with a bore extending through the housing defining a bore axis;b. a chamber extending laterally of the bore and communicating with the bore;c. a ram in the housing;d. a cartridge means releasably mountable to the ram;e. a ram cylinder extending from and communicating with the chamber;f. a hydraulically actuated ram piston within the ram cylinder;g. a ram piston rod coupling the ram to the ram piston;h. an energizer cylinder coupled to the ram piston rod;i. a hydraulically actuated energizer piston within the energizer cylinder;j. an energizer piston rod coupled to the energizer piston; andk. an energizer compressor coupled to the energizer piston rod; andl. an energizer in abutting contact with the energizer compressor, the energizer providing compression to the cartridge upon actuation of the energizer piston.