23
6.2.2 Air supply
For a trouble free and satisfactory operation of the pneumatic components in the Oilcon
®
Oil
Discharge Monitoring and Control System a supply of clean, dry air at a constant pressure is
essential.
Air supply conditions EPU
Valve control 4,0 bar nom., 7 bar max. (0,4 MPa nom., 0,7 MPa max.)
Window wash pump 4,0 bar nom., 7 bar max. (0,4 MPa nom., 0,7 MPa max.)
Average consumption 6 l/min
Maximum consumption 50 l/min
6.2.3 Electrical supply
Electrical supply conditions
Main Control Unit 24 VDC – 0,1 A
Emergency supply 24 VDC – 0,1 A
Electro Pneumatic Unit 115/230 VAC 50/60 Hz, 0,5 A
Sample pump motor 3 phase 380–420 VAC, 50 Hz, 1.1 kW, 2.5 A
or 3 phase 440–480 VAC, 60 Hz, 1.3 kW, 2.5 A
NOTE:
AS REQUIRED BY REGULATIONS THE EMERGENY POWER SUPPLY HAS TO
ORIGINATE FROM A SOURCE INDEPENDENT FROM THE SOURCE OF THE MAIN
POWER SUPPLY.
6.3 PIPEWORK GENERAL
All pipework for water services should be of a suitable material and capable of withstanding working
pressures of up to 16 bar. The pipework has been standardised at 15 mm O.D. with a minimum wall
thickness of 1 mm. For example: ASTM B111-69 alloy 706 - or BS 378/2871 type CN 102-0.
Air signal pipework should be copper, and generally be 6 mm O.D. x 4 mm I.D.
The exception in this sizing is the air supply for the window wash pump mounted on the skid, and
shown as V12. These lines are 8 mm O.D. x 6 mm I.D. (ASTM B75-68 alloy 122 - or BS 2871/1971
type C106-0).
Pipework must be clean and oil free prior to fitting and care must be taken to ensure all joints are
leak tight. Failure to ensure this will adversely affect system function, particularly if air leakage is
evident on pump suction lines. Ideally all joints should be made using brazed couplings. If piping is
being installed during a sea passage then compression fittings may be used. These couplings
should be of a salt water resistant material, and the use of stainless steel compression rings may be
necessary if a non-flared tube end technique is used to make the joints. Mild steel couplings must
not be used. Pipework must be adequately clipped and supported, and shall not impose any strain
or force on equipment, e.g. pump or skid assembly. Pipework must also be protected in exposed
situations. In those cases where the water discharge from the ballast skid is taken to a slop tank, if
the ship has an inert gas system, a loop-seal arrangement must be fitted in the discharge line to
prevent contamination being forced back down the line. Also measures must be taken to prevent the
discharge from free-falling into the tank. This is usually achieved by diverting the flow against the
bulkhead of the tank.
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