The pump has stopped, and the cooling water for the mechanical seal has been cut off
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If the pump stops running and the cooling water for the mechanical seal is cut off, the pump will freeze up – will it then be unable to rotate?
If the water is not drained and the weather is cold, it will definitely freeze over, so the vehicle may not be able to turn.
Sure! If it is a backup pump, take measures to prevent freezing ； If not used for a long time, take precautions against freezing or remove the lower plug to drain the water.
For outdoor pumps, if there is no insulation, the cooling water needs to be kept running at all times.
If it’s not hot standby, the liquid must be completely drained; if it is hot standby, heat retention must be ensured
Reply 5# *aofeibuct agrees with the view
It’s very dangerous; by then it won’t just be a problem of being unable to rotate the vehicle. In cold regions, the mechanical seal will definitely get damaged due to freezing. The equipment can also be cracked by freezing. It is recommended not to shut down the system to seal off the water; running it at a lower capacity is sufficient.
For pumps that are water pumps or those handling non-special media, a small hole can be made in the outlet check valve. Allowing a small recirculation loop of the medium, without affecting flow rate, can prevent freezing. If it is no longer in use, there is usually a small plug at the lowest point of the pump body. Just turn on the discharge and it’s okay. The flow rate of the mechanical seal cooling water is usually very low; if it’s in hot standby mode, keep it on, but turn it off when it’s not in use. Remember to drain the water from the pipes!
Why stop the machine and shut off the cooling water?
Go back upstairs. The purpose of shutting down the system and sealing it is to reduce losses
Reply to 1# xb123: It might not freeze in the south, but in the north, water in the pipes will definitely freeze if it doesn’t flow. If the pump is not used for a long time, the water must be drained in cold areas. .