Transport Publication - TP 12301 E (2008)
- 10.0 General Provisions
- 11.0 Test specifications
- 12.0 Calibration of Meter
- 13.0 Calibration Test, Contaminant and colour test, Sample pressure or flow test, Shut off tests, Utilities supply variation test, Calibration and zero drift test, and Response time test
- 14.0 Issuance of Certificate of Type Approval
10.1 Calibration and testing shall be carried out using a light distillate fuel oil having a relative density of 0.83 at 15° C .
10.2 These Test and Performance Specifications relate to Bilge Alarms. In addition, the electrical and electronic section of these systems shall be in accordance with the Specifications for Environmental Testing contained in Part 3 of IMO Resolution MEPC .107(49).
10.3 The Bilge Alarm being tested shall comply with all the relevant requirements of the technical specifications contained in section 7.0 of this Standard.
11.1 The sampling arrangement for the test rig should be such that a representative homogeneous sample is obtained under all conditions of operation and under all operational proportions of oil content. The sample should be obtained from the full flow through the Bilge Alarm, but when this is impracticable the sampling arrangements shown in Figure 3 in Schedule 1 shall be used. Special care should be given to this stage of the process and the validity of the resultant findings.
11.2 During the various tests, the response time of the Bilge Alarm shall be checked and it shall be noted whether alarms operate adequately when a pre-stated threshold is exceeded.
11.3 A diagrammatic arrangement of a test facility for evaluating the performance of the Bilge Alarm is given in Figure 2. The accuracy of the Bilge Alarm shall be determined by comparing its readings against a known flow of Test Fluid injected into a known flow of water. The grab samples taken shall be analysed in a laboratory by the methods specified section 15 of this Standard. The results of the laboratory analysis shall be used for correction and to indicate sampling and test equipment variability. The water flow rate shall be adjusted so that the entire Test Fluid-water flow passes through the Bilge Alarm, except the intermittent grab sample stream. Special care should be given to keep, continuously, a constant Test Fluid content in the water that flows into the Bilge Alarm. The metering pumps should be adjusted to deliver a nearly continuous quantity of Test Fluid. If Test Fluid injection becomes intermittent at low concentrations, the Test Fluid may be pre-mixed with water to provide continuous flow. The Test Fluid injection point should be immediately up-stream of the Bilge Alarm inlet to minimize time lags.
12.1 The oil content meter shall be calibrated at 0, 2, 4, 6, and 9 ppm . A complete calibration curve shall be provided in the format shown in Figure 4 in Schedule 3. The calibration procedure shall be conducted as follows.
12.2 Four tanks for pre-mixed oily mixtures, one tank of fresh water and one settling tank for drainage, with associated piping and testing equipment, shall be provided in a testing arrangement as shown in Figure 1 in Schedule 1.
12.3 With all valves closed the tank shall be filled with liquid, as appropriate.
12.4 Valve A shall be opened and fresh water shall be allowed to flow through the meter for 5 minutes, at which time the reading on the meter shall be noted and the point shall be marked on the calibration diagram. This point should be the zero point on the meter scale. If this is not so, corrective action shall be taken. Valve A shall be shut.
12.5 Valve B shall be opened and the 2 ppm oily mixture shall be allowed to flow through the meter for 5 minutes, at which time the meter reading point shall be marked on the calibration diagram. Valve B shall be closed.
12.6 Valve A shall again be opened and fresh water shall be allowed to flow through the meter. The flow of the cleansing water shall be continued until the meter reading has been zeroed for 5 minutes. Valve A shall then be closed.
12.7 Valve C shall be opened and the calibration operation shall be continued using an identical calibration and cleansing sequences to those described in paragraphs 12.5 and 12.6.
12.8 The calibration point for the 6 ppm and 9 ppm oily mixtures shall be plotted, using an identical calibration and cleansing sequence to those described in paragraphs 12.5 and 12.6.
12.9 The five calibration points shall be joined in order to establish the calibration curve.
13.0 Calibration Test, Contaminant and colour test, Sample pressure or flow test, Shut off tests, Utilities supply variation test, Calibration and zero drift test, and Response time test
13.1 The Calibration Test, Contaminant and colour test, Sample pressure or flow test, Shut off tests, Calibration and zero drift test, and the Utilities supply variation test, as described in IMO Resolution MEPC .107(49) are accepted for the purposes of the Standard and need not be repeated.
13.2 In addition to The Response time test described in MEPC .107(49) the following shall be carried out:
The response time is to be taken for the Bilge Alarm to give an alarm at 5 ppm oil concentration after the supply to the Bilge Alarm is changed from clean water to oily water having a concentration of more than 5 ppm . The response time of the Bilge Alarm should be as short as possible and in all cases shall be such that the closing of an associated automatic stopping device would occur no longer than 20 seconds from the time of changing from clean water to oily water having a concentration of more than 5 ppm .
14.0 Issuance of Certificate of Type Approval
14.1 Following successful calibration and the procedures required by section 13.0 as applicable, the equipment shall be considered to have passed the test.
14.2 A copy of the test data and the results of the test shall be forwarded to: The Manager, Environmental Protection, Marine Safety, Transport Canada Ottawa, Ontario K1A 0N8.
14.3 The test results shall include the test laboratory’s analyses of the five calibration test samples and the one alarm test sample, in the general format shown in the Table in Schedule 2.
14.4 If satisfied with the test data and test results, the Manager, Environmental Protection, Marine Safety may cause a Certificate of Type Approval to be issued.