4 Test specification
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
obtainedoil/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 has 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 50ºC. .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:
- from 2 Hz - 13.2 Hz with an amplitude of ± mm; and
- from 13.2 Hz - 80 Hz with an acceleration amplitude of ± 0.7 g.
Additionally the equipment should be capable of reliable operation at angles up to
22.5º in any plane from the normal operational position.
4.9 The following information should be included with the test
report:
- the manufacturer's specification and operating instructions;
- a diagrammatic description of the test rig;
- types of oils used;
- densities of water used;
- details of all tests performed.