Some form of PSSR Pre-Start Up Safety Review or HS4 Hazard Study 4 should be carried out at the point of handover from the construction team to the testing and commissioning team. This is to ensure that the plant has been constructed according to the design intent, and that it is safe to proceed to testing and commissioning.
Testing and commissioning is the process of checking that everything installed on site was installed correctly and operates as intended. This stage typically involves on site loop testing of actuated valves, calibration of instrumentation, testing of pumps, and other operational tests. It is common practice to carry out water trials on equipment at this stage. This is a relatively non-hazardous method of checking the system operates as expected.
Upon completion of water trials, a hazard study 5 (HS5) is generally completed. This ensures that the system is ready and safe to start up with chemicals. HS5 confirms that:
In many cases, there is a handover period between the commissioning and operations team. This period usually focuses on ensuring that any snagging works are completed. It is also possible that some fine tuning of equipment is required during the initial product trials. The commissioning team are normally responsible for this before full handover to operations. HS5 should be carried out before the commissioning team disperse, to ensure that their knowledge is captured and acted upon.
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