How should large flow gear pump stop operation

Many use large flow pump customer personnel problems when the pump stops working or don't know what to do, in order to avoid giving unnecessary loss due to sudden stop pump running below I summarize treatment. Gear pump belongs to quality in all of the gear pump somewhat nice and have some special application scope. But when the stainless steel pump is working, there will be some unexpected failures, such as shutdown. It is necessary for us to analyze the main reasons for the shutdown, so as to avoid unnecessary damage to the machine in the future

 

The shutdown is mainly caused by the failure of the mechanical seal. Failure performance is mostly leakage, leakage reasons are as follows:

 

(1) compensation ring sealing washer leakage, the main reasons are: cover deformation, preload force is not uniform; Incorrect installation; The sealing ring quality does not meet the standard; Incorrect ring selection.

 

The leakage of the sealing surface of the stationary and static ring mainly has the following reasons: the flatness of the end face, the roughness does not meet the requirements, or the surface is scratched; There is granular material between the two end faces, resulting in the two end faces can not run the same; Installation is not in place, the way is not correct.

 

We should pay attention to a few aspects after the large flow gear pump stop operation

 

The shutdown of high temperature domestic water pump shall be carried out according to the provisions of the technical documents of the equipment. After the shutdown, the pump shall be rotated half a turn every 20 to 30 minutes until the temperature of the pump body drops to 50℃.

 

(2) transport easy to crystallize, easy to solidify, easy to precipitate and other media of the pump, after the pump should be stopped to prevent blockage, and timely use water or other media to wash the pump and pipeline.

 

After the centrifugal oil pump stops running, the valve of the pump shall be closed. After the stainless steel sewage pump is cooled, the valve of the subsidiary system shall be closed successively. Drain the accumulated liquid in the pump to prevent corrosion and frost cracking.

 

When the low temperature gear oil pump stops, when there is no special requirements, the pump should often be filled with liquid; Suction valve and discharge valve should be kept normally open; For cryogenic pump with double end mechanical seal, the grouting pressure of the pump shall be maintained by the level controller and the sealing fluid in the seal chamber of the pump.

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