What are the reasons why pump preheating doesn’t work?
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What are the reasons why preheating with a hot oil pump doesn’t work?
Check if the preheating pipeline is unobstructed?
Check whether the pre-heating line is unobstructed and not blocked
Blow steam through the preheater and the inlet pipeline of the pump, and check whether there are impurities in the process fluid
Reply to 1# jiangpengchengs: 1. The pre-heating line is blocked. 2. The hot oil inside the pump has solidified; common solutions are as follows: 1. Fully open the pre-heating line and wait for it to heat up gradually. 2. Supply steam or use a belt heater connected to the pre-heating line or the pump to speed up the heating process. 3. The last method is not recommended: if it’s possible to rotate the pump shaft, run the pump for a short period of time in an attempt to unblock the pre-heating line.
Reply to 1# jiangpengchengs: The reasons for the failure of pump preheating include: 1. The preheating valve is opened too little or it is damaged. 2 The preheating pipeline is blocked. 3 Check whether there is a preheating medium.
The analysis above is quite comprehensive; I’ll add a few more points. The pumps that are preheated are all standby pumps, and for preheating to be possible, the outlet pressure must be higher than the inlet pressure; if the operating pump is under vacuum or the outlet pressure is low (compared to the inlet pressure), it is also difficult to carry out preheating. If it is a heavy oil pump (such as asphalt, residue), it is likely to be a sludge line or sludge pump.
I’ve encountered this problem with my device: the preheating valve became clogged. The solution is to use steam to blow on the bottom of the valve, thereby melting the solidified substance; blowing for about ten minutes usually resolves the issue