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MALE

CONTROL

POD

INTERME

DIATE
PACK
FEMALE
ER
LOWER
RECEPTA
FEMALE
CLE
SEA
POD
LS
RECEPTA

CLE

Figure 6.18 – Koomey system for redundant hydraulic control. (Courtesy

Vetco)

The Koomey double female system for BOP control is comprised of a male

control pod connected to the hydraulic control hose bundle that houses the

hydraulically controlled SPM. As in the single female system, the SPM directs the

main hydraulic power to the various functions on the stack. In the double female

system, the control pod seals and locks in an intermediate female receptacle bolted

to the lower riser package. When the lower riser package is installed on the BOP

stack, the male mated to the intermediate female receptacle lands and seals in the

female receptacle in the upper frame of the stack.

BOP stacks are always equipped with two control pods for complete backup

hydraulic control. Hydraulic pilot hoses and a hydraulic supply hose make a bulky

package run from the surface — moreso as water depth increases. For this reason,

a number of manufacturers are now providing elec- trohydraulic control systems.

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