Section 11 Factory Acceptance Test and Shipboard Trials of Engines

11.1.1 Before any test is carried out, all relevant equipment for the safety of attending personnel is to be made available by the manufacturer/shipyard and is to be operational. This is to include crankcase explosive conditions protection, overspeed protection and any other shutdown function.

11.1.2 The overspeed protective device is to be set to a value which is not higher than the overspeed value that was demonstrated during the type test for that engine. This set point is to be verified by the Surveyor.

11.2.1 Engines which are to be subjected to trials on the test bed at the manufacturer's works and under attendance by the Surveyor(s) are to be tested in accordance with the scope of works trials specified in Pt 10, Ch 1, 11.3 Works trials (factory acceptance test). The scope of the trials is to be agreed between LR and the manufacturer prior to testing.

11.2.2 Where multiple engines of the same design are manufactured, a quality assurance approach to approval may be applied if the manufacturer meets the requirements of and is registered on the Quality Assurance Scheme for Machinery (QAM). (See Rules and Regulations for the Classification of Ships, July 2022 Pt 5, Ch 1, 6 Quality Assurance Scheme for Machinery).

11.2.3 Before any official testing the engines are to be run in as prescribed by the engine manufacturer.

11.2.4 Adequate test bed facilities for loads as required in Table 1.11.1 Scope of works trials for engines are to be provided. All fluids used for testing purposes such as fuel, lubrication oil and cooling water are to be suitable for the purpose intended, e.g. they are to be clean, and if necessary pre-heated to achieve the recommended operating temperature. This applies to all fluids used temporarily or repeatedly for testing purposes only.

These surveys are normally to be made during the works trials, but at the discretion of LR parts of these surveys may be postponed to the shipboard testing.

11.2.6 Where the type test was not carried out on the complete engine, as described in the scope of this chapter, integration tests are to be conducted as part of the works or shipboard trials to confirm satisfactory operation of the complete engine. This includes satisfactory functioning on all fuel types on which the engine is to operate. See also Pt 10, Ch 1, 11.4 Shipboard trials 11.4.6.

11.2.7 For the duration of the acceptance test, no interventions or adjustments will be made to the machinery under test.

11.3.1 The purpose of the works trials is to verify design parameters such as power, fire protection and prevention arrangements, adherence to approved limits (e.g. maximum pressure) and functionality, and to establish reference values or base lines for later reference in the operational phase.

11.3.2 During testing the environmental conditions are to be recorded, including ambient air temperature, ambient air pressure and atmospheric humidity.

11.3.3 For each trial condition the parameters to be recorded include: power and speed; fuel index (or equivalent reading); maximum combustion pressures; exhaust gas temperature before turbine and from each cylinder (or from manifold, see Note 5 in Table 1.7.1 Engines for propulsion purposes: alarms and safeguards slow-downs ); charge air temperature and pressure, and turbocharger speed (only for category B and C turbochargers).

11.3.4 For all stages of the works trials the pertaining operation values are to be measured and recorded by the engine manufacturer. All results are to be compiled in an acceptance protocol to be issued by the engine manufacturer. Where the engine designer requires through life monitoring of crankshaft deflections, such measurements are also to be taken before and after works acceptance trials in accordance with the engine designer’s requirements.

11.3.5 In each case given in Table 1.11.1 Scope of works trials for engines, all measurements conducted at the various trial conditions are to be carried out at steady operating conditions. The readings for MCR, i.e. 100 per cent power (rated maximum continuous power at corresponding rpm) are to be taken twice at an interval of at least 30 minutes. For all trial conditions provision should be made for time needed by the Surveyor to carry out visual inspections.

11.3.7 Calibration records for the instrumentation are, upon request, to be presented to the attending Surveyor.

11.3.8 Alternatives to the detailed tests may be agreed between the manufacturer and LR when the overall scope of tests is found to be equivalent. The scope of the trials may be expanded depending on the engine application, service experience, or other relevant reasons.

11.3.9 Turbocharger surge margin for propulsion engines is to be demonstrated as required by Pt 10, Ch 1, 12.4 Matching with engine 12.4.2

11.3.10 For electronically controlled engines:

1. Factory acceptance tests in accordance with Pt 10, Ch 1, 1.4 Submission requirements 1.4.2;

2. integration tests are to be made to verify that the response of the complete mechanical, hydraulic and electronic system is as predicted for all intended operational modes and the tests considered as a system are to be carried out at the works. If such tests are technically unfeasible at the works, then these tests may be conducted during sea trial; and

3. verification of engine configuration, see Pt 10, Ch 1, 4.3 Control engineering systems 4.3.2, and that the approved software quality plans, including the software configuration management process, are being applied.

11.3.11 Checks of components to be presented for inspection after the works trials are left to the discretion of the Surveyor.

11.4.1 The purpose of the shipboard testing is to verify compatibility with power transmission and driven machinery in the system, safety, control and auxiliary systems necessary for the engine and integration of engine/shipboard control systems, as well as other items that had not been dealt with in the FAT (Factory Acceptance Testing).

11.4.2 After installation on board, engines are to undergo shipboard trials as specified in Table 1.11.2 Scope of shipboard trials for engines. The scope of the trials may be expanded depending on the engine application, service experience or other relevant reasons, and is to be agreed between the LR Surveyor and the Shipyard prior to testing.

11.4.4 Trials are to include demonstration of engine control, monitoring, alarm and safety system operation to confirm that they have been provided, installed and configured as intended and in accordance with the relevant requirements for main, auxiliary or emergency engines.

11.4.5 For electronically controlled engines:

1. On board tests in accordance with the approved schedule, see also Pt 10, Ch 1, 1.4 Submission requirements 1.4.2; and

2. verification of engine configuration, see Pt 10, Ch 1, 4.3 Control engineering systems 4.3.2 and Pt 10, Ch 1, 1.4 Submission requirements 1.4.3, and that the approved software quality plans, including the software configuration management process, are being applied.

11.4.6 The suitability of an engine to burn residual or other special fuels is to be demonstrated, where the machinery installation is arranged to burn such fuels in service. Dual- or multi-fuel engines are to be tested on all fuels that the engine is specified to use. Where engines operate on a mix of different fuels then this is to be demonstrated. See also Pt 16, Ch 1, 7.2 Unattended machinery space operation - UMS notation 7.2.1.

11.4.7 For both manual and automatic engine control systems acceleration and deceleration through any barred speed range, is to be demonstrated. The transit times are to be equal or less than the times stated in the approved documentation and are to be recorded. This also applies when passing through the barred speed range in reverse rotational direction, especially during the stopping test. The ship’s draft and speed during all these demonstrations are to be recorded. Where a controllable pitch propeller is fitted, the pitch is also to be recorded.

11.4.8 The engine is to be checked for stable running (steady fuel index) at both upper and lower borders of the barred speed range. Steady fuel index means an oscillation range less than five per cent of the effective stroke (idle to full index).

11.4.9 In addition to the tests listed in Table 1.11.2 Scope of shipboard trials for engines, other tests may also be required by statutory regulations (e.g. the testing of exhaust gas emissions is to comply with MARPOL - International Convention for the Prevention of Pollution from Ships as applicable).

11.5.1 At the discretion of the attending Surveyor, the scope of the trials may be expanded in consideration of special operating conditions, such as towing, trawling, etc.