Problems with the preheating line of hot oil pumps
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The pre-heating line of the hot oil pump runs from behind the outlet valve to in front of the check valve at the pump outlet, but it was found that a large section of piping and flanges before and after the check valve were cold. Has anyone encountered this issue? If it’s heavy oil, then it’s useless
This is a serious issue; first of all, a heat tracing pipeline needs to be added in this section； The second method is to use two cross-wires, one across the valve and one across the check valve ； Third, use a cross-check valve with the outlet valve slightly open (this does not meet safety requirements, but many companies do this).
We have a problem here: the pre-heating wire of the pump is broken, and the check valve has holes in it: L
If the pump is turned at high speed, it reverses direction; turning it at low speed has no effect.
Yeah, I wonder if this was taken into consideration in the design
It is necessary to ensure that a certain amount passes through; otherwise the pump will not reverse direction, and it must also serve to preheat.
This post was last edited by longziyun on 2018-9-26 at 22:52. Since it is a pre-heating line for hot oil pumps, insulation is necessary both for thermal protection and to prevent burns. The pump should be located in the pump room; therefore, the pre-heating line should also be in that area. Wouldn’t it be sufficient to use steam to warm the pipes and melt the ice? A typical pre-heating line consists of a three-valve assembly – gate valves at both ends along with drain valves. Installing check valves doesn’t serve any practical purpose and can even be counterproductive. If the medium is an oil slurry, it is not recommended to keep the valve in the open position; severe wear will occur, and the valve will not close properly. Repairing the pump in such a situation could have disastrous consequences. It is recommended to use reprocessed oil as the preheating medium for the slurry pump. Reprocessed oil with almost no solid content makes a good preheating medium; although there are still some fluctuations, the advantages are significant.