Page 167 - Well Control for Completions and Interventions

Well Control Surface Equipment 159

Figure 4.14 Hydril GK annular preventer.

working pressure when closed on open hole. The manufacturers list the
following features:
• Single packing unit that closes on any size pipe or open hole and han-
dles stripping.
• Only two moving parts: the piston and packing unit, for less wear and
maintenance
• Optional latched head for fast, easy access to the packing unit and
wear seals: the majority of GK annulars have a screwed head design.
• Bolted-in inner sleeve that is field-replaceable.
• Replaceable wear plate that eliminates metal-to-metal contact between
the packing unit inserts and the BOP head—extending time between
major overhaul and repair (Fig. 4.14).

4.7.3 Hydril GL preventer
The “GK” annular preventer is designed primarily for sub surface use but
can be used for platform and land operations. Three sizes are available;
3
1
13/8,18/4 and 21/4 in. The working pressure is 5000 psi.
5