Marine Installation; Recommendations; Orifice Plates; Composite End - BOWMAN EC Series Installation, Operation, Maintenance Manual

2.4 Marine installation, recommendations
No oil cooler manufacturer can guarantee that their products will have an
indefinite life and for this reason, we suggest that the cooling system is
designed to minimise any damage caused by a leaking oil cooler. This can be
achieved as follows:
1.
2.
3.
4.
5.

2.5 Orifice Plates

If the sea water supply is taken from a ship's main, it is important to ensure that
the recommended flow cannot be exceeded.
This will normally mean that an orifice plate must be fitted in the pipework at
least 1m before the oil cooler, with the orifice size calculated to ensure that the
maximum sea water flow rate cannot be exceeded.
The correct orifice diameter can be determined from the table below.
Three Pass Bowman
Oil Coolers
Oil Cooler Max. Sea water
Series flow I/min
EC 50
FC 80
FG 110
GL 200
GK 300
JK 400
PK 500
RK 900
2.6 Composite end cover water pipe installation
For marine versions supplied with composite end covers, it is recommended
that a bonded seal is used in conjunction with the fitting and tightened to the
appropriate torque figure given below to ensure sufficient sealing.
EC range (3/4" BSP)
FC range (1" BSP)
FG range (1 ¼" BSP)
GL range (1 ½" BSP)
2 6
The oil pressure should be higher than the sea water pressure, so that in
the event of a leak occurring, the oil will not be contaminated.
When the hydraulic system is not being used, the coolers should be
isolated from sea water pressure.
The sea water outlet pipe from the cooler should have a free run to waste.
Stainless steel sea water pipes and fittings should not be used adjacent to
the oil cooler.
Important note for marine applications: during commisioning, shutdown
and standby periods, if the oil cooler has not been used over 4-6 day
period, it should be drained, cleaned and kept dry. Where this procedure is
not possible, drain the stagnant water and refill the oil cooler with clean
sea or fresh water, which should be replaced with oxygenated sea water
every 2-3 days to avoid further decomposition.
Orifice diameter in mm for max. sea water flow
1 bar 2 bar 3 bar
11 9.5 8.5
14 12 11
17 14 13
23 19 17
28 23 21
32 27 24
41 34 31
48 40 36
Size
4 bar 5 bar 6 bar 7 bar
8 7.5 7.2
10 9.5 9
12 11 10
16 15 14
19 18 17
22 21 20
28 27 26
34 32 30
Torque (Nm)
8 bar 9 bar 10 bar
6.8 6.7 6.5 6.3
8.7 8.4 8.2
10 9.8 9.6 9.3
14 13 13 13
17 16 16 15
20 19 18 18
25 24 23 23
29 28 27 26
10
15
20
25
8