New equipment or systems that have been out of use for a long time because of welding slag, rust, oil sludge and other impurities need to be thoroughly cleaned to remove welding slag, oil and other impurities.
Use special cleaning agent or low viscosity heat transfer oil to flush the pipeline to ensure that there is no residue.

New equipment or systems that have been out of service for a long period of time need to make sure that there are no leaks in the piping, valves, flanges, and other connections to ensure safe operation.
Pressure test (usually 1.5 times the working pressure) should be carried out after the first oil filling.

Check whether the expansion tank, circulating pump, filter, oil storage tank and other equipment is normal.
Make sure the system valves, thermometers, pressure gauges, flow meters and other instruments are intact.

Newly injected or long-term storage of heat conduction oil, due to system residual water, heat conduction oil stored improperly into the water and so on need to dewatering and degassing operation. The first time to slowly warm up to 100 ~ 120 ° C, 180 ~ 230 ° C, each held for 8 ~ 12 hours, the discharge of water and low-boiling material to ensure that the water, low-boiling material in all the discharge in the rise to the use of temperature.
During the warming process, it is necessary to observe the exhaust situation several times to prevent the gas resistance from causing pressure fluctuations or oil spraying.

Start the circulating pump, make sure the oil circuit is smooth, pressure and flow rate are stable before igniting and heating.
Initial warming rate ≤ 20 ℃ / hour, to avoid local overheating.