Pipeline pump requirements and the use of accessories features

In order to improve the suction performance of the pump, the suction pipe of the pipe pump should be shortened as far as possible, with less turning (the elbow is better to use the large curvature radius) to reduce the pipeline resistance loss. In order to prevent the pump from producing cavitation, the pump suction pipe should avoid accumulating the saccular part of the gas as much as possible. When it can not be avoided, an exhaust valve of DN15 or DN20 should be arranged in the bag-shaped part. When the pump suction pipe for the vertical direction, the suction pipe if the configuration of the different diameter pipe, you should configure the eccentric reducer, so as to avoid the formation of air bags.

In order to avoid the pipe, the weight of the valve and the thermal stress of the pipe, the force and moment produced by the pump exceed the maximum allowable external load of the pump inlet and outlet. Pipe racks shall be provided on the suction and discharge pipes of the pump. Pump nozzle allowable maximum load should be provided by the pump manufacturer.

Vertical or vertical pump outlet, in order to reduce the force on the pump nozzle, the nozzle above the pipeline to be provided with pipe racks, the plane position to be as close to the nozzle, pipe can be used to support pipe longitudinal beam, so often the pump Arranged under the pipe gallery.

Conveying liquid with density less than 650Kg / m3, water pump such as liquefied petroleum gas, liquid ammonia, etc. The suction pipe of the pump should have a slope gradient pump 1/10 ~ 1/100 to return the gas generated by gasification to the suction tank Avoid pump cavitation.

Single suction pump at the entrance, it is best to configure a period of about 3 times the diameter of the straight pipe imports.

For double suction pump, in order to avoid cavitation of bi-directional suction horizontal centrifugal pump, the pump double suction pipe should be arranged symmetrically to ensure uniform flow distribution on both sides. The vertical pipe is connected directly by the elbow, but the axis of the pump must be perpendicular to the plane where the elbow is located. At this point, the import piping requirements as short as possible elbow then reducer, and then import the flange. Under other conditions, the pump inlet should be not less than 3 times the diameter of the straight pipe.

Discharge valve between drain valve and check valve at pump outlet. Diameter greater than DN50, but also in the check valve bonnet hole to open the net valve installed. The same size pump import and export valves try to use the same elevation.

Import and export of non-metallic pump valve on the weight of the pipeline must not be pressure on the pump body, should be set to rack to prevent crushing the pump body and switch the valve before and after the twist of the pipeline.

Steam reciprocating pump exhaust pipe should be less turning, the pump may accumulate condensate drain pipe located in the area, a large amount of venting but also install silencers. Inlet pipe should be set in front of the condensate drain valve to prevent water hammer cylinder.

Steam reciprocating pump in operation generally have greater vibration, and the pump connected to the pipeline should be well fixed.

When the pump outlet center line and the center line of the pipe pillars distance greater than 0.6m, the export pipeline swing check valve should be placed in a horizontal position, this time does not allow the valve cover installed on the net valve.

When the pipe rack above the pump and motor, in order not to affect lifting equipment lifting, pump pipe to have sufficient height. Pipeline transporting corrosive liquids should not be arranged above the prime mover.

Pipeline bottom of the pipe bottom to the floor of the net distance of not less than 4m, in order to meet the inspection requirements.

When the pipe rack above the pump body, the bottom of the pipe from the ground clearance height should not be less than 2.2m.

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