Hydril GK® Annular BOP

Redefining “Field Proven” for 50+ Years

The GK annular defines the phrase, “field proven,” having demonstrated its world-class dependability and quality for over 50 years. It is designed specifically to make maintenance easy and to lengthen the intervals between packing unit changes and shop repairs. In addition:

  • The Hydril packing unit for the GK can hold full rated working pressure and will close on an open hole.
  • The GK produces extra uptime when compared to competing units.
  • A replaceable wear plate eliminates metal-to-metal contact between the packing unit inserts and the BOP head.
  • A long piston design provides complete balance, more reliable operation and ease of assembly.
  • The GK is offered with a screwed head or latched head design.
  • A bolted-in inner sleeve eliminates the need to stress-relieve if the sleeve is damaged in the field.
  • The compact design of the GK fits rigs with small substructures.
  • The GK is available with minimal lead times.

Selected Engineering Data*

GK Annular BOP
Designation 7-3 7-5 7-10 7-15 7-20
Bore Size (inches) 7-1/16 7-1/16 7-1/16 7-1/16 7-1/16
Head Type Screwed Screwed Screwed Screwed Screwed
Working pressure (psi) 3000 5000 10000 15000 20000
Shell Test Pressure (psi) (Factory Test Only) 6000 10000 15000 22500 30000
Designation 9-3 9-5 11-3 11-5 11-10
Bore Size (inches) 9 9 11 11 11
Head Type Screwed Screwed Screwed Screwed Screwed
Working pressure (psi) 3000 5000 3000 5000 10000
Shell Test Pressure (psi) (Factory Test Only) 6000 10000 6000 10000 15000
Designation 11-10 13-3 13-3 13-5 13-5
Bore Size (inches) 11 13-5/8 13-5/8 13-5/8 13-5/8
Head Type Latched Screwed Latched Screwed Latched
Working pressure (psi) 10000 3000 3000 5000 5000
Shell Test Pressure (psi) (Factory Test Only) 15000 6000 6000 10000 10000
Designation 13-10 13-10 16-5 16-5
Bore Size (inches) 13-5/8 13-5/8 16-3/4 16-3/4
Head Type Screwed Latched Screwed Latched
Working pressure (psi) 10000 10000 5000 10000
Shell Test Pressure (psi) (Factory Test Only) 15000 15000 10000 15000
  • Carbon steel, stainless steel, and Inconel® 625, are options for the ring grooves.
  • SermaGuard™ coating on all internal surfaces.
  • Packing units available with nitrile or natural compounds.

* See brochure for additional data

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