Phuel BOP System, User Manual

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User Manual
Modular BOP System (Dual)
OPS-3653-Rev A 6
4 Operation
4.1 Operating the Rams
Note – Always ensure that the pressure across the rams has been equalised
before opening.
4.1.1 Hydraulic Operation
The BOP has been provided with flexible armoured piping to offer the required
fire protection level. Two connections are required for each ram set for open
and close. It is important that both connections are connected, as the fluid
displaced by the movement of the piston must be allowed to pass through the
valve system back to the reservoir
A Well Control Unit (WCU) is normally used to operate the BOP in an offshore
environment. Refer to the relevant manual for that equipment for details of
operation and connection. An alternative pump pack may be used for onshore
maintenance work but the operation of this equipment is out with the scope of
this manual.
IT IS IMPERATIVE THAT BOTH THE RAMS ARE CLOSED
SIMULTANEOUSLY WHEN CLOSING AROUND THE WIRE. Failure to
follow this procedure may result in cutting or damage to the wire.
4.1.2 Manual Operation
The rams can be closed manually (but not opened again) by turning the hand
wheel in a clockwise direction some 30-40 turns providing that the hydraulic
fluid from the other side (open port) is allowed to escape. The hydraulic
connections must still, therefore, be made up to the WCU even when
intending to operate the rams manually. When closing around the wire
IT IS
IMPERATIVE THAT THE UPPER GUIDED RAM AND THEN THE LOWER
GUIDED RAM IS FULLY CLOSED BEFORE CLOSING THE UPPER NON
GUIDED RAM AND THEN THE LOWER NON GUIDED RAM.
Failure to
follow this procedure may result in cutting or damage to the wire. The non-
guided rams can be identified by the restrictor valve block attached to the
return hose for the actuator – This side must be closed last.
Once the rams have been closed using the manual method it is not possible
to open them again without hydraulic pressure. The Hand wheel, however,
must still be turned in an anti-clockwise direction until it stops to allow the
piston to move fully back.
4.1.3 Locking the Rams
After closing with hydraulic pressure the piston can be mechanically locked by
winding in the manual mechanism. Turning the hand wheel in a clockwise
direction will advance the locking mechanism by 3mm per turn. It is therefore
necessary to turn the hand wheel 30-40 turns to lock in the piston. Continue to