Subsea Valves Not Moving
Subsea Valves Not Moving
(OP)
Gents,
We have subsea valves that have not been functioned for a while.
As Left: Filled with MEG at ambient
Flowing pressure: 120 barg
Max DP: 120 barg
Content found initially: Hydrate
Valve condition: clear evidence of the valve passing.
The line now is clean and clear of hydrates, however we still can't function the valves even going up to damage torque. Anyone got suggestions that could help?
Thanks
We have subsea valves that have not been functioned for a while.
As Left: Filled with MEG at ambient
Flowing pressure: 120 barg
Max DP: 120 barg
Content found initially: Hydrate
Valve condition: clear evidence of the valve passing.
The line now is clean and clear of hydrates, however we still can't function the valves even going up to damage torque. Anyone got suggestions that could help?
Thanks
Mechanical Operations Engineer
Oil, Gas & Power





RE: Subsea Valves Not Moving
RE: Subsea Valves Not Moving
Morning, they are ball valves, operated over 5 years ago, equalized pressures, had differential pressures across them, cycled the pressure, pumped in methanol, MEG, venting, heating wraps etc and they still said no
Mechanical Operations Engineer
Oil, Gas & Power
RE: Subsea Valves Not Moving
You may what to try removing the mechanical stops on the valve and then try again just to crack them in the opposite direction
what size valves are they?
RE: Subsea Valves Not Moving
Also are you able to slightly slaken off the bolts holding the body of the valve together ...just some ideas,be safe