BS ISO 22547:2021 pdf download – Ships and marine technology — Performance test procedures for high-pressure pumps in LNG fuel gas supply systems (FGSS) for ships
The actual pump input power (P), in kilowatts (kW), can be measured using the torque and revolution speed of the motor. The motor output can be taken as the actual pump input, regardless of the arrangement of the power transmission system between the motor and the pump.
5 Test procedure
5.1 Precooling and starting
The pump and the test arrangement shall be maintained at cryogenic temperatures during the test.
A preliminary inspection shall be conducted before testing, as follows:
a) Visual inspection of the pump and related devices.
b) Visual inspection of the LOS of the pump and related devices (if applicable).
c) Visual inspection of the electricity supply to the pump.
d) Visual inspection of the communications and data collection system.
e) Visual inspection of the open/close positions of the valves for the initial operation of the pump test arrangement.
After precooling the test pump, start the pump if the operation conditions meet the set parameters,including temperature and suction pressure, and conduct the test according to the designated test procedures. The surge chamber (accumulator) shall be included in the test scope, if provided with the pump by the client.
Precooling is used to prepare both the pump and the test arrangement at cryogenic conditions. A cryogenic test fluid at a certain flow rate is supplied from the tank to the test arrangement to lower the temperature of the test arrangement and the pump. The target temperature of precooling shall be designated by the client.
The precooling procedure of the high-pressure pump to the relevant minimum operating temperature shall be documented in the test report (see example of a test report in Annex A).
The test pump shall be started after temperature stabilization and the speed of the pump, which shall be adjusted to the test pressure. The flow rate shall be increased up to the test flow rate; then the control valve shall be slowly throttled until it reaches the test pressure to start the performance test.
5.2 Performance test
The performance test shall be conducted according to the load steps shown in Figure 3. A test report shall be produced based on the data recorded every 5 min during the test, see example in Annex A. Different load steps may be applied taking into account the characteristics of gas consumer.
NOTE 1 If agreed with the client, the testing time at each step can be longer than specified below. NOTE 2 Additional load step test (e.g. zero to 100 %) can be conducted if required by the client. The performance test shall be carried out as follows.
a) Adjust the discharge pressure of the pump to the test pressure.
b) Upon reaching step 25 % or minimum of the test flow rate, whichever is lower, maintain the state for 10 min. Record the measurement.
c) Raise the flow rate up to 50 %. Upon reaching step 50 % of the test flow rate, maintain the state for 10 min. Record the measurement.
d) Raise the flow rate up to 75 %. Upon reaching step 75 % of the test flow rate, maintain the state for 10 min. Record the measurement.
e) Raise the flow rate up to 100 %. Upon reaching step 100 % of the test flow rate, maintain the state for 10 min. Record the measurement.
6 Additional tests
6.1 Unit production test The individual pump shall be subject to the unit production test at the manufacturer’s premises or at the site designated by the client. For type-tested pumps, the unit production test shall be carried out for the following items:
a) requirements from the IGC and IGF Codes;
b) requirements from classification societies;
c) requirements specified by the client, which may include measurement of vibration, noise and others, d) flag state requirements. Pressure testing shall be done at 1,5 times the design pressure. Performance of safety devices should also be conducted. The test personnel should consider the risks of pneumatic testing versus hydrostatic testing when choosing the test methods.