The BOP is thus safer and more efficient requiring less maintenance and less downtime. Hydril Annular Bop Operation Manual Hydril Annular Bop Operation Manual - hydril annular bop operation manual pdf€hydril gk 13 5 8 operation. 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.
Last Updated on Fri, The 'GK' is designed for surface installations and is also used on and.
