4.1 The interface detector should be set up and
used according to the manufacturer's operating instructions.
4.2 The test facility should consist of a container
whereby the obtained oil/water interface can be made clearly visible.
The depths of the oil and water layers should each be at least sufficient
to completely immerse the detector probe.
4.3 The accuracy of the detector should be determined
by comparing its indication against the position of the known interface
between the oil and water.
4.4 The following oils, or their equivalents,
should each be used in combination with fresh water (density 1.000),
brackish water (density 1.012) and salt water (density 1.025) at ambient
temperature:
- Leaded automotive gasoline- (regular grade)
- Light diesel oil- (No. 2 fuel)
- Arabian light crude oil- (medium density and viscosity)
- Residual fuel- (bunker C or No. 6 fuel)
4.5 Each test whereby the properties of either
the oil or water have been changed should begin by establishing the
position of the interface after sufficient time has been allowed for
the oil to settle. Following each test, the detector should be cleaned.
4.6 If oil contamination has an effect on the
accuracy or the responding time of the detector, it should be stated
in the test report.
4.7 The effect of temperature on the detector
response should be tested with Arabian light crude oil, or equivalent,
in combination with salt water (density 1.025) both at ambient temperature
and at 50°C. Any effect of temperature on the responding time
should be stated in the test report.
4.8 The satisfactory functioning of the permanently
installed detector should not be affected by the movements and vibrations
experienced on board ship. In particular, electrical or electronic
detectors should be tested to show that they are at least capable
of continued operation under vibration conditions as follows:
Additionally the equipment should be capable of reliable operation
at angles up to 22.5° in any plane from the normal operational
position.
4.9 The following information should be included
with the test report:
-
.1 the manufacturer's specification and operating
instructions;
-
.2 a diagrammatic description of the test rig;
-
.3 types of oils used;
-
.4 densities of water used;
-
.5 details of all tests performed.