General Maintenance; Cleaning; End Cover Bolt Tightening Sequence - BOWMAN EC Series Installation, Operation, Maintenance Manual

5.2 General maintenance

While the unit is in operation, weekly inspection of the heat exchanger and its connections should be
maintained for leaks and externally visible damage.
®
BOWMAN
should be renewed at this time.
Removal of the screws around the periphery of each end cover will allow the end covers and seals to be
removed. The tubestack can then be withdrawn from either end of the body.

5.3 Cleaning

Any cleaning solutions used must be compatible with the oil cooler materials. This should be confirmed
with the chemical's supplier before use.
The chemical solution can be circulated through the heat exchanger or the unit can be disassembled and
the tubestack submerged in a container filled with cleaning fluid.
If necessary the fluid should be neutralized after cleaning and the unit should be flushed with fresh water
and dried.
Small diameter rods and brushes for tube cleaning are available from companies such as Easy Products
www.easyproductsltd.com
Replacement O rings should be fitted and the end cover bolts should be initially be hand tightened then
tightened in the sequence and to the torque figures below:
Oil Cooler
Series
EC
FC
FG
GL

5.4 End cover bolt tightening sequence

M8
22
M10
37
End covers must be refitted in the correct orientation to ensure correct performance.
Rev D
recommend that the tubestack should be cleaned and inspected annually and the o rings
Bolt Size Torque (Nm)
M6
M8
M8
M10
Oil Cooler
Series
8 GK
22 JK
22 PK
37 RK
9
Bolt Size Torque (Nm)
M12 54
M16 95
M16 130
M16 130