Cosasco
®
RBS/RBSA Retriever Maintenance Work Instruction
P/N: 741031revH
Scheduled Review Date: July 2018
Page:
44 of 46
Date: 26/06/2017
Note: Please ensure you have the latest revision of this document by downloading it from our website or by contacting Cosasco Customer Service.
2. After completing all six tests in step 11, release pressure in the hydraulic pump by
turning the pressure hold screw on the left hand side of the pump towards
"Pressure Release".
Note:
this process must be repeated for the top ball valve
when testing a double isolation model.
3. Ensure the main (or both) ball valves are opened and place the Retriever tool onto
the Service Valve. Turn the hammer nut union in a clockwise direction.
4. Tighten the hammer nut using a brass or equivalent non sparking hammer.
5. Ensure the bleed to atmosphere valve(s) on the Service Valve is closed and the
Retriever bleed to atmosphere valve is opened.
6. With the hydraulic pump on "Pressure Hold” and at its low-pressure setting (the
button on the right hand side of the pump body pulled out) hand pump the oil
through the Service Valve and into the retrieval tool, ensuring the isolating valve is
opened.
7. Continue pumping until all air is displaced from the Retriever atmospheric bleed
valve.
8. Continue pumping and during a pump action, close the Retriever atmospheric
bleed valve.
9. Continue pumping and pressurize the assembly to the pressures stated in step 11.
Leave pressurized for 15 minutes during each stage and observe that there is no
pressure drop on the pressure test rig gauge.
Note:
There may be some drop in
pressure during the 15 minute test period due to the compression of air still in the
system and also due to water being drawn back into the hand pump. If any
pressure loss is due to leakage, this will be visible and immediately apparent.
10. During each stage the Retriever requires to be stroked to check the integrity of the
seals over the full travel of the outer barrel.
11. Repeat step 12.
12. Check both the pressure gauges on the test rig and retrieval tool are at zero and
drain off any residual fluid trapped in the retrieval tool and Service Valve.
13. Remove both the retrieval tool and Service Valve from the test rig.
14. Complete a pressure test certificate for both the Retriever and the Service Valve
and file these in the dedicated maintenance folder for each tool.
15. A scanned copy of the original should also be filed accordingly.
Note -
There may be some drop in pressure during the 15 minute test period due to
the compression of air still in the system and also due to water being drawn back into
the hand pump. If any pressure loss is due to leakage, this will be visible and
immediately apparent.
Summary of Contents for RBS
Page 45: ...NOTES ...
