User Manual
Document no. / rev.: ROX000337352_AE
Hydraulic Retrieval Tool
17
23. Switch pump from “install” to “retrieve”.
24. Slowly open the head valve to release the pressure. The connecting rod will start moving up into the
tool (the line pressure will push it back), close the head valve and check for leaks (this is done to
shorten the period / distance to pump the plug back in case of leaks). Reopen the head valve. Use
the pump in retrieve mode and start pumping until the pressure gauge on the pump shows that
pressure is starting to build up inside the retriever. This indicates that the probe is fully retrieved.
Check for leaks around the locking pins. If leaks do occur, the probe must be reinstalled.
Figure 4: Step 24
25. To make sure that the probe is fully retrieved, pump some additional strokes on the pump, and
check that the pressure inside the retriever increases for each stroke, and stabilizes at the higher
level (If necessary, keep pumping until such stabilization is achieved).
26. Close the service valve. If the valve cannot be closed, the probe must be installed again, and the
valve inspected in order to determine the reason for this problem.
If the ball valve still cannot be closed, it is most likely due to one of the following causes:
26.1. There are large amounts of sand/debris inside the valve, hampering the rotation of the ball.
26.2. The device is not fully retrieved.
26.3. The device is fully retrieved, but the device length exceeds the capacity of the retriever.
27. If a double service valve is being used, close the lower service valve ball first. Make sure that both
bypass valves on the service valve are closed. To utilize the added safety of the double isolation
valve, it is important to verify the function of the lower ball before upper ball is closed.
When using the pump in "retrieve" position, the pressure should never exceed 100 bars
(see gauge on pump). This because if the probe for some reason should be prevented from
moving out of the fitting, attempting to retrieve it at a higher pressure might cause damages
to the plug or to the retriever. If the plug / probe cannot be retrieved at 100 bars, it should be
left inside the fitting until the next shut down.
