Cleaning Of Air Oil Cooler Type B10/M10-30 - Kongsberg SR Series Maintenance Manual

Maintenance manual

7.18 Cleaning of air oil cooler type B10/M10-30

WARNING
Wear suitable protective gear such as glasses and gloves when handling acid
and other cleaning solutions.
Some contaminants may be easily removed by back flushing with water or acid, as detailed in the following steps,
while heavy fouling requires disassembly and manual cleaning in accordance with step 7. In this case, cooler
replacement may be the practical corrective action
Gaskets deformed due to the tightening must dry for 24 hours to revert to their original form before reassembly.
This will reduce the risk of leakage. Otherwise, replacement gaskets may be installed (See Table 5-4 Spares).
1. Set the motor controller selector switch to position 2 - STOP.
2. Loosen the cooler holding clamp by unscrewing the nuts. Inspect the vibration dampers and clamp
rubber, replace if damaged.
3. Make sure the system is depressurized, and disconnect the hydraulic pipes from the cooler matrix.
4. With minor contamination, deposits may be removed by back flushing the cooler with water. This
can be performed by temporarily connecting the water supply hose to the cooler outlet
connection and using the other hose to route the water from the inlet connection to a bucket,
then opening the supply water valve until the water runs clear. See also step 5.
5. With heavy contamination, fouling may be removed by flushing a solution of water with 5%
phosphoric acid or, if cleaned frequently, a solution of water with 5% oxalic acid from an external
source. If performed, continue with step 6. Otherwise, skip to step 7.
6. Rinse the cooler with a large quantity of water. Ensure all acid is removed before restarting the
system.
7. For heavy fouling not removed with acid flushing, M10 type seawater cooler may be disassembled
and manually cleaned. In which case, continue with step 8. For B10 type cooler the cooler must be
replaced if the contamination does not flush out. Otherwise, skip to step 15.Connect the flexible
hydraulic houses to the cooler matrix.
8. Close the expansion tank ball valve for the pump unit and disconnect the cooler oil circulation
hoses from the cooler. Install protective covers to prevent contamination.
9. Move the cooler to a container for cleaning and disassembly. Start by releasing the center bolt and
nut and unscrew the bolt from the cooler. To keep the plates parallel during disassembly, loosen
the bolts and nuts at each end 2-3 mm at a time at alternating ends until fully released. Place the
cooler on the back side and remove one plate at a time. Number each plate to note the order of
assembly and reserve gaskets, gasket rings, screws, nuts and washers for reassembly.
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