HALE AP, Technical Manual

Page: 34 / 177

22
3.3. Pressure Test
This test is to be carried out ONLY if the pump will not hold a vacuum with blanking cap(s) in po-
sition, and is intended to trace the leak(s) responsible for the loss of vacuum. This test is con-
ducted without the pump running. Refer to Table 2 for a list of tools and/or consumables re-
quired for this procedure.
Table 2. Pressure Test Tools And Consumables List
Standard Tools Special Tools Consumables
PPE (Eye and Hand Protection) None Shop Rag(s) (As Required)
Pressurized Water Source
(50 to 100 psi)
Perform the following steps to pressure test a pump.
A. Place blanking cap(s) on pump inlet(s) and outlet(s).
B. Attach pressurized water source. (Can be attached via a blanking plate or
pump plug.)
C. Apply a water pressure of 50 – 100 psi (3.5 – 7.0 bar or 350 – 700 kPa) to
pump.
D. Check for leaks.
Visually inspect all drain/relief valves for water leakage. 1.
Visually inspect all external fittings/hoses on pump for water leakage. 2.
Visually inspect all external areas/surfaces of pump for water leakage. 3.
Visually inspect all external areas/surfaces of primer assembly for water 4.
leakage.
a)
If leakage is found, replace the primer seals and O-rings. Refer to para-
graph C.3.3.3, ESP Primer Maintenance, in APPENDIX C.
b) If leakage persists, replace primer assembly.
If the pump will not achieve 22 (± 2) inHg (–0.745 bar or –74.5 kPa) of vacuum, and will not
hold what it does achieve, there is a leak. It may possibly be a fault in the primer (if apparatus is
so equipped) or the pump shaft seals.
If the apparatus priming pump was used for the Vacuum Test (or was attached to the pump dur-
ing pressure testing) and no external leaks are apparent, first check the primer (ONLY if the ap-
paratus is so equipped and the primer was attached during testing). Primer points to check are:
• Low charge on or batteries not of sufficient size.
•
Electrical connectors on cable dirty or bad ground.
•
Primer vanes worn.
•
Priming valve not fully opening (operator error).
If a fault in the primer is NOT indicated check the pump shaft seals and the gearbox cooling tube.
Pump shaft seal and cooling tube points to check are:
• Water in the gear oil.
•
Gear oil in the discharge or drain ports.
Complete all associated maintenance log entries.