Class 4 ROV torque tools

[murr52]

I can't seem to find how accurately the Class 4 torques tools for manual valves can be controlled. Most of the companies who manufacture them don't show how precisely the actual output torque can be regulated.

Any one know if its typical for a ROV operator to accidentally or unknowingly spike the torque tool over 100 ft-lbf or 50 ft-lbf?
if his target was 200 ft-lbf or 1200 ft-lbf

 

[Sircrashalot]

My very limited experience with a tool, the torque can be controlled very accurately and the operator would have to try and spike the torque over the set point. On the system I saw, the operator would set a torque limit, and then control the fluid flow and pressure to the tool to control it. As soon as the torque hit the limit, the system would cut it out. We were controlling the torque in about 10 Nm increments, up to 300 Nm. Spikes were limited to about 2-3 Nm over the set point as far as I can remember. However we were being VERY careful with the operation we were doing.

Andy