Type D multi-stage centrifugal pump leak leakage reason analysis

Water leakage is one of the common fault type D multi-stage centrifugal pump, water pump in working status, if not set between the pump housing and shaft sealing device, the media is allowed to flow out from there, if is poisonous and harmful transmission medium will cause more bigger. Working condition requirements under the condition of high, will need to select points on type D multi-stage centrifugal pump mechanical seal, in order to realize the coordinated rinse solution to achieve good sealing performance, at the same time a good long life is packing can not be achieved. So solve the d-type multi-stage centrifugal pump leaking situation is to ensure that the pump long-term stability an important factor of work. Type D leak leakage reasons of multistage centrifugal pump is mainly composed of the following respects.

1, installing a static test

such as small leakage, leakage of dynamic or static ring seal problems: large leakage, suggests that there is a problem between dynamic and static ring friction pair. In the preliminary observation, judgment, leak leakage, on the basis of manually turning observation, if leakage, no obvious changes in the static and dynamic seal has a problem: dynamic and static ring friction pair problems; Ring sealing ring, quiet ring seal failure. In addition, the leakage channels can also exist, but generally speaking, there are difference between primary and secondary, as long as observe carefully, be familiar with the structure, will be able to correct judgment.

2, test run, leakage occurs when the

multistage centrifugal pump with after static test, the operation, high speed rotating centrifugal force, inhibits the leakage of medium. So, eliminate between shaft and the end cover seal failure, basic it is due to the dynamic and static ring friction pair destroyed.

cause friction pair of seal failure factors mainly include:

(1) operation, because of time, cavitation, pressure-out anomalies, such as large axial force, caused by the dynamic and static ring contact surface; For installing a mechanical seal, large amount of compression of the result in friction pair face serious wear and scratches;

(2) ring sealing ring too loose or too tight, spring can't adjust the amount of the axial float ring;

(3) static ring ring too loose, when axial float ring and static ring from static ring;

(4) has a granular material in the working medium, in friction pair during operation, testing dynamic and static ring sealing face;

5. Design selection, seal face pressure is low or sealing material cold sex is bigger. The above phenomenon often appears in the test run, and sometimes can be eliminated by appropriate adjustments such as the static ring for, but most need to tear open outfit, replace the seal.

3, a sudden leakage in the normal operation of

D multi-stage centrifugal pump leakage, mostly due to the condition of sudden changes in running larger or operation, caused by improper maintenance.

(1) time, cavitation, or longer pressure-out, leading to seal damage;

(2) the actual pump output slants small, a large number of medium inside the pump circulation, heat accumulation, cause gasification medium, lead to seal failure;

3. Back to the big traffic, damage to the seal;

(4) for a long time to shut down, the friction pair pulled bad sealing surface due to adhesion;

5) medium corrosive, polymerized, and colloidal substances increased;

6. Rapid changes in environmental temperature;

7 working condition of frequent change or adjust;

today all of a sudden power failure or downtime, etc. Hydraulic water pump in the sudden leakage during normal operation, such as is not found in time, tend to have larger accident or loss, must attach importance to it and take effective measures.

all this leak, should choose corresponding solutions according to the problems, change can change, can fix it. Small refinements can't literally, reluctantly let centrifugal pump used for a period of time, such as a big problem to overhaul.

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