Cosasco RBS, Руководство по обслуживанию

Страница: 43 / 46

Cosasco
®
RBS/RBSA Retriever Maintenance Work Instruction P/N: 741031revH
Scheduled Review Date: July 2018 Page: 43 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.
6.2 Pressure Testing Procedure
1. Fit the Service Valve to the access fitting on the pressure test rig by placing the
hammer nut end of the valve onto the sealing face of access fitting.
2. Turn the hammer nut clockwise down the external acme thread until the Service
Valve is securely seated to the access fitting body.
3. Tighten the hammer nut using a brass or equivalent non sparking hammer.
4. Check that the bypass valve on the Service Valve is closed and the atmospheric
bleed valve(s) is open.
5. The Back Pressure pump should be filled with hydraulic oil and a connecting hose
(of a suitable pressure rating) used to connect the pump outlet to the quick coupler
inlet fitted to the test rig.
6. With the 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 into the
pressure test rig, ensuring the isolating valve is opened.
7. Continue pumping until all air is displaced from the atmospheric bleed valve.
8. Continue pumping and during a pump action, close the atmospheric bleed valve.
9. Stop pumping once the oil level has passed the main (bottom valve if testing a
double isolation valve) ball valve and close it.
10. Re-commence 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.
1. Pressure test the equipment to the following pressures:
 5% of pressure rating of equipment.
 10% of pressure rating of equipment.

20% of pressure rating of equipment.

50% of pressure rating of equipment.

100% of pressure rating of equipment.

150% of pressure rating of equipment.
IMPORTANT!
If at any point either Retrieval Technician deems it necessary, for any
reason, then the equipment must be stripped, cleaned, and serviced in
accordance with the relevant
Cosasco ‘Maintenance Work Instruction’.
A successful pressure test will then be required prior to further use!