1. A proposed test programme should be submitted prior to the testing.
2. During testing of continuous bollard pull (BP) the main engine(s) should be run at the manufacturer's recommended maximum torque according to maximum continuous rating. Verification of the actual output should be requested during the test.
3. During testing of overload pull, the main engine(s) should be run at the manufacturer's recommended maximum rating that can be maintained for minimum 30 minutes.
The overload test may be omitted.
4. The propeller(s) fitted when performing the test should be the propeller(s) used when the vessel is in normal operation.
5. All auxiliary equipment such as pumps, generators and other equipment which are driven from the main engine(s) or propeller shaft(s) in normal operation of the vessel should be connected during the test.
6. The length of the towline should not be less than 300 metres, measured between the stern of the vessel and the test bollard. A minimum length of twice the vessel length might be accepted.
7. The water depth at the test location should not be less than 20 metres within a radius of 100 metres of the vessel. If the water depth of 20 metres cannot be obtained at the test location, then a minimum water depth which is equal to twice the maximum draft of the vessel may be accepted. It should be noted that reduced water depth may adversely affect the test results.
8. The test should be carried out with the vessel's displacement corresponding to full ballast and half fuel capacity.
9. The vessel should be trimmed at even keel or at a trim by stern not exceeding 2% of the vessel's length.
10. The vessel should be able to maintain a fixed course for not less than 10 minutes while pulling as specified in items 2. or 3. above. Certified continuous bollard pull is the average reading of the 10 minutes period.
11. The test should be performed with a wind speed not exceeding 5 m/sec.
12. The current at the test location should not exceed 0.5 m/sec. in any direction.
13. The load cell used for the test should be approved by a competent body and be accurate within +/- 2% within the range of loads to be measured and for the environmental conditions experienced during the test.
14. An instrument giving a continuous read-out and also a recording instrument recording the bollard pull graphically as a function of time should both be connected to the load cell. The instruments should if possible be placed and monitored ashore.
15. The load cell should be fitted between the eye of the towline and the bollard.
16. The figure certified as the vessel's continuous bollard pull shall be the towing force recorded as being maintained without any tendency to decline for a duration of not less than 10 minutes.
17. Certification of bollard pull figures recorded when running the engine(s) at overload, reduced RPM or with a reduced number of main engines or propellers operating can be given and noted on the certificate.
18. A communication system shall be established between the vessel and the person(s) monitoring the load cell and the recording instrument ashore, by means of VHF or telephone connection, for the duration of the test.
15 июн 2022
