Things to note before starting refrigeration equipment in summer
In the hot summer, the working environment of the refrigeration equipment is different from the usual temperature environment and the degree of saturation of the work. These problems begin to affect the working cycle of the refrigeration equipment and even extend to work safety. Therefore, Shanghai Bingma Refrigeration Technology Co., Ltd. has sorted out eight precautions before starting the refrigeration equipment:
1. Check the machine room records to understand the reasons for the shutdown.
For normal shutdowns of more than three days and nights, experienced operators must be asked to start the machine. For accident shutdowns that require maintenance (including medium or major repairs), the person in charge or technicians must guide the startup.
2. Compressor inspection:
① For open compressors, check whether there are obstacles in the transmission running parts and whether the protection device status is intact.
② For compressors equipped with oil sight glasses, check whether the berth has reached the normal area.
③ For Freon refrigeration compressors equipped with oil heaters, they must be powered on and heated before starting to volatilize the Freon dissolved in the oil and allow the oil pump to operate normally. The equipment heating time shall be subject to the provisions in the product manual.
④ The pressure gauge valve must be opened and the pressure must be observed to be normal.
⑤ If the oil system is equipped with an oil three-way valve, it is necessary to confirm that the handle of the oil three-way valve is in the working position.
⑥ Compressors with energy regulating devices or unloading devices should be set at a smaller load or no-load position.
⑦ The shaft seal should be checked for the open type. If there is a valve in the return oil pipe of the mechanical shaft seal, it must be opened, and the gland of the packing shaft seal should be slightly loosened.
3. Check the refrigeration system
Check whether the opening and closing of each manual valve on the refrigeration system pipeline is in normal state.
4. Check each equipment
Check whether the stop valve and each pressure equalizing valve in front of the safety valve, pressure gauge, liquid level indicator, etc. on each equipment are open. However, the charging valve and oil collector, the air vent valve, the air vent valve, etc. on the air vent should be closed.
5. Check the liquid accumulator
Check whether the refrigerant liquid level in the liquid accumulator and other equipment is within the required range.
6. Check the water pump and fan
Check whether there are obstacles in the operating parts of the water pump and fan, and whether the motor and each equipment are normal.
7. For water-cooled condensers, open the condenser inlet and outlet valves.
For horizontal shell and tube condensers, close the drain valve and open the breather valve.
Start the water pump to supply water to the condenser, compressor water jacket and crankcase oil cooler, and close the breather valve when water comes out.
8. Turn on the power and prepare to start.
The above content is the precautions sorted out during the equipment installation and commissioning process, which can effectively avoid safety problems and equipment damage caused by improper operation.
