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9
Take Care
5.2 General maintenance
While the unit is in operation, weekly inspection of the heat exchanger and its connections
should be made for leaks and externally visible damage. BOWMAN® recommend that the
tubestack should be cleaned and inspected annually and the o rings 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 The tubestack can then be withdrawn from either end of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
Whilst we strongly recommend that mechanical and chemical cleaning of the heat exchanger is
carried out only by specialised companies, below are some general guidelines that may be useful;
a) Removing the end covers allows access to the tube stack, which can be removed
from the body.
b) Wash the tube plates and tubes using a hand held hose or lance. An industrial steam
cleaner can also be used if available.
c) Tube brushes can be used to clean through each tube to aid removing stubborn deposits.
Small diameter rods and brushes for tube cleaning are available from companies such as
Rico Industrial Services www.ricoservices.co.uk
d) Detergents or chemicals suitable for use with the tube material* can be used if
fouling is severe. Allow time for the detergent or chemical cleaner to work, before hosing
down with plenty of water. *Please refer to the spare parts list for details of the tube materials.
e) The tube stack should be ushed through with clean water to remove all traces
of cleaning chemicals/detergents. If necessary, the cleaning uid should be neutralised.
f ) When retting the end covers after cleaning, new ‘O’ seals must be used
5.4 End cover screw tightening sequence
End covers must be retted in their original
orientation and tightened to the torque gures
below.
Cooler Series Screw Size Torque (Nm) Cooler Series Screw Size Torque (Nm)
EC M6 8 GK M12 54
FC M8 22 JK M16 95
FG M8 22 PK M16 130
GL M10 37 RK M16 130
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