Our HVAC Engineer was sent to Singapore to join the second leg of the voyage on board the FPSO Dalia. Our role was to commission the DX refrigerated cooling systems for the Electrical Substations and advise the Siemens PLC technician on the correct operating strategy for this type of system. We worked rigorously to build trends on the HMI and ensure the systems were working as efficiently as possible. The units were skid mounted McQuay Screw compressors with a common dual compressor arrangement for duty and standby operation. These then connected to a common evaporator coil with the air-handling units. A lot of time was spent working on the loading cycle to ensure the compressors were run as efficiently as possible.