Apparatus for hydrostatic testing using power from and ROV

Apparatus for sealing a flanged opening of a flanged item located under a body of water, which apparatus is comprised of:

• I) a remotely operated vehicle located below the surface of a body of water, which remotely operated vehicle comprises at least one power system, one of which is a hydraulic system, which remotely operated vehicle is at the vicinity of a subsea structure having a flanged opening to which a blind flange is to be positioned, or hydrotesting performed, wherein said flanged opening is associated with a subsea structure used in the oil and gas industry;
• II) a hydrotesting apparatus containing a blind flange comprising:
• a) a circular rear plate section having an elongated U-shaped slot forming an opening and giving said rear circular plate a C-shape, which elongated slot is capable of receiving a flange of a flanged opening to be sealed;
• b) a front circular plate section having a front face and a rear face and having a through-hole at its center for receiving an elongated hollow shaft capable of longitudinal movement;
• c) an elongated hollow shaft extending through said through-hole of said front circular plate section, said elongated hollow shaft having a first end and a second end which first end extends through said through-hole of said front circular plate section,
• d) a blind flange having a first face and a second face which second face is secured at its center to said first end of said elongated hollow shaft extending through said through-hole of said front plate section;
• e) a C-shaped middle section having a slot for receiving the flange of said flanged opening to be sealed, which middle section is located between and connected to said circular rear plate section and said front circular plate section which provides a space between said rear plate section and said front circular plate section and capable of receiving a flange of the flanged opening to be sealed and for receiving said blind flange and having sufficient room for horizontal movement of said blind flange in and out of contact with the flange of the flanged opening to be sealed;
• and
• f) an actuator secured to said front face of said front circular plate section, which actuator is capable, when activated, of horizontally moving said elongated shaft and blind flange so that said blind flange can be moved in and out of contact with the flange of the flanged opening to be sealed.