Longest packing unit life is obtained by adjusting the closing chamber pressure just low enough to maintain a seal without any leakage as the tool joint passes through the packing unit. Three choices of packing unit rubber compoundsįigure 27 - Type 'GK' Annular Blowout Preventerĭuring well control operations, drill pipe can be rotated and tool joints stripped through a closed packing unit, while maintaining a full seal on the pipe.Piston stroke measurement provides indication of packing unit life without disassembly.Field replaceable wear plate in the BOP head serves as an upper non-sealing wear surface for the movement of the packing unit, making field repair fast and economical.This ensures a more positive seal off under kick conditions for a higher margin of safety. Piston is designed to be well pressure assisted.The BOP is thus safer and more efficient requiring less maintenance and less downtime. Only two moving parts (piston and packing unit) mean few areas are subjected to wear.Seal off is affected by hydraulic pressure applied to the closing chamber, which raises the piston, forcing the packing unit into a sealing engagement.
Standard operation requires both opening and closing pressure. The 'GK' annular preventer is designed for surface installations and is also used on offshore platforms and subsea.
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