High - pressure reciprocating pump performance adjustment methods

Issuing time:2020-12-18 22:35

High - pressure reciprocating pump performance adjustment methods

Reciprocating pump and a certain pipeline system formed a unified device, its working point is generally determined.Sometimes for some needs, hope to artificially adjust the flow of the pump, in order to change the working condition, usually, using reciprocating pump flow regulation and reciprocating pump parallel operation to adjust the flow, so that it is in line with its operating conditions.

1. Flow regulation

Because the pump flow and pump cylinder number I, piston area F, stroke n and stroke s is proportional to, change any one of the parameters, can change the flow of the pump.In drilling pump commonly used to regulate the flow of the following methods.

Change the cylinder liner of different diameter.

When designing a drilling pump, the cylinder liner is usually divided into several stages. The flow rate of each level of cylinder liner is roughly distributed according to geometric series, that is, the ratio between the flow rate of the larger diameter cylinder liner of the previous stage (I) and the flow rate of the smaller diameter cylinder liner of the adjacent next stage (I +1) is approximately constant.According to the need, choose different diameter cylinder liner can get different flow rate.

(2) adjust the stroke of the pump.

Between the power machine and drilling pump usually do not add the speed change mechanism, under the condition of mechanical transmission, the appropriate change of the speed of the power machine can adjust the pump stroke.If the pump is driven by diesel engine, the diesel engine speed can be adjusted between the rated speed n and the minimum speed Nmin to make the pump change between the rated stroke and the minimum stroke to achieve the purpose of regulating the flow. It should be noted that in the process of adjusting the speed, the pump pressure must not exceed the limit pressure of the cylinder liner of the stage.

Reduce the pump in the workroom.

In the deep section drilling, often smaller diameter, in order to minimize circulation loss, generally hope that the pump flow is small.In other adjustment methods can not meet the requirements, the site sometimes used to reduce the pump studio method: such as open the valve box, take out a few discharge valves or suction valve, so that some studios do not participate in the work, thus reducing the flow.The disadvantage of this method is that it aggravates the pulsation of flow and pressure.Practice shows that under this abnormal working condition, the fluctuation caused by taking down the discharge valve is less than that caused by taking down the suction valve, and the pressure fluctuation caused by taking down the discharge valve near the power end is smaller for the double-cylinder double-action pump.

(4) By-pass regulation.

The pump discharge line in parallel with a bypass pipeline, open and adjust the bypass valve, you can adjust the flow of the pump.Bypass regulation is also a common emergency relief means in drilling pumps.

2. Parallel operation of reciprocating pump

In order to meet the needs of a certain flow, reciprocating pumps are often connected in parallel in oil mines.When reciprocating pump works in parallel, the liquid is transported out of the uniform discharge pipe. It can be seen from the equal power curve of the pump that the parallel work has the following characteristics:

(1) when the pump suction pipe is roughly the same, discharge pipeline junction point to the pump discharge outlet distance is very small, for high pressure to work under the reciprocating pump, can approximately think that all pumps are working under the same pressure P.

(2) the total flow in the discharge pipeline is the sum of the flow of each pump working at the same time, when each pump is completely the same, the total flow of m pumps is Q=mQ.

(3) the total hydraulic power output of the pump group is the sum of the hydraulic power output of each pump at the same time.

(4) in the pipeline characteristics under certain conditions, for mechanical transmission of reciprocating pumps, the total flow after parallel is still equal to the sum of the flow of each pump working alone, and the pump pressure after parallel is greater than the pump pressure of each pump working alone in the pipeline.

Pump parallel operation is to increase the flow.It should be noted that the total pressure P for parallel operation must be less than the ultimate pressure of the cylinder liner used by each pump, each pump stroke should not exceed the rated value.

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