Phuel BOP System, Руководство пользователя

Страница: 12 / 39

User Manual
Modular BOP System (Dual)
OPS-3653-Rev A 7
turn until the hand wheel stops, indicating that the piston is now against the
back-up lock.
For safety reasons and to reduce the mechanical effort required,
Phuel
recommends that the hydraulic pressure be removed or reduced while
closing the mechanical back up
. This reduces the risk of injury caused by
the failure of a seal under hydraulic pressure and decreases the time required
to implement the back up feature.
It is important to remember that the manual lock must be fully withdrawn
before the rams can be opened. No damage to the mechanism will occur if
pressure is reversed with the lock in place – providing that the maximum
operating pressure is not exceeded.
4.2 Equalising across the rams
Each ram has a dedicated equalising valve block and these blocks are
connected together to allow single point chemical injection, pressure
measurement and dump facility.
There are four valves on each block, two are for equalising and two are for
isolation. By opening and closing the appropriate valves it is possible to either
equalize the pressure across closed rams, inject chemicals above or below
any of the rams or a combination of both. There are two isolated external
ports that allow the connection of a pressure gauge and drain hose if required.