What Are The Selection Requirements For Water Pump Pipelines

Nov 08, 2024

The selection of water pump pipelines is extremely important for the performance of the water pump. In order to improve the suction performance of the water pump, the suction pipeline of the water pump should be shortened as much as possible and the number of bends should be minimized (large curvature radius should be used for bends) to reduce pipeline resistance losses. To prevent cavitation of the pump, the suction pipeline of the pump should avoid the accumulation of gas in the cystic part as much as possible. If it cannot be avoided, a DN15 or DN20 exhaust valve should be installed in the cystic part. When the suction pipe of the pump is in a vertical direction, if a reducer is installed on the suction pipe, an eccentric reducer should be installed to avoid the formation of air pockets.

In order to avoid the weight of pipelines and valves, as well as the forces and moments generated by pipeline thermal stress, exceeding the maximum allowable external load of the pump inlet and outlet, pipe racks must be installed on the suction and discharge pipelines of the pump. The maximum allowable load for the pump tube port should be provided by the pump manufacturer.

For pumps with vertical inlet or outlet, in order to reduce the force on the pump pipe mouth, a pipe rack must be installed above the pipe mouth, and its plane position should be as close to the pipe mouth as possible. The pipeline can be supported and suspended by the longitudinal beam of the pipe gallery, so the pump is often arranged under the pipe gallery.

When transporting liquids with a density less than 650Kg/m ³, such as liquefied petroleum gas, liquid ammonia, etc., the suction pipeline of the pump should have a slope of 1/10~1/100 towards the pump, so that the gas generated by gasification can return to the suction tank to avoid cavitation of the pump.

Install a straight pipe with a diameter approximately three times the inlet diameter at the inlet of various centrifugal pumps.

For double suction pumps, in order to avoid cavitation of horizontal centrifugal pumps with bi-directional suction, the double suction pipes should be symmetrically arranged to ensure even flow distribution on both sides. The vertical pipeline is directly connected through an elbow, but the axis of the pump must be perpendicular to the plane where the elbow is located. At this point, the imported piping should be as short as possible, with the elbow connected to the reducer and then connected to the inlet flange. Under other conditions, there should be a straight pipe section of no less than 3 times the diameter of the pipe before the pump inlet.

Use a drain valve to drain the gap between the shut-off valve and check valve at the pump outlet. When the pipe diameter is greater than DN50, a drain valve can also be installed by opening a hole on the valve cover of the check valve. Try to use the same elevation for the inlet and outlet valves of pumps of the same specifications.

The weight of the valves on the inlet and outlet pipelines of non-metallic pumps must not be pressed on the pump body. A pipe rack should be installed to prevent damage to the pump body and the pipelines before and after the valves are twisted when opening and closing.

The exhaust pipeline of the electric reciprocating pump should have fewer bends, and a discharge pipe should be installed at the location where condensation water may accumulate. If the discharge volume is large, a muffler should also be installed. The steam inlet pipeline should be equipped with a condensate discharge pipe before the steam inlet valve to prevent water from hitting the cylinder.

Steam reciprocating pumps generally experience significant vibrations during operation, and the pipelines connected to the pump should be well secured.

When the distance between the centerline of the water pump outlet and the centerline of the pipe gallery column is greater than 0.6m, the swing check valve on the outlet pipeline should be placed in a horizontal position, and it is not allowed to install a clean valve on the valve cover at this time.

When the pipeline is placed above the motor, in order not to affect the lifting of the lifting equipment, the pipeline should have sufficient height. Pipelines transporting corrosive liquids should not be arranged above the original moving equipment.

The net distance from the bottom of the pipeline in the lower part of the pipe gallery to the floor should not be less than 4m to meet maintenance requirements.

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

5. Pipe size: The size of the pipe should be chosen based on the flow rate requirements of the water supply system. A larger diameter pipe allows for a higher flow rate, while a smaller diameter pipe can restrict water flow and cause pressure drops.

6. Installation requirements: The installation of the pipeline requires specialized expertise and equipment. The contractor must have the required skills and experience to install the system correctly and ensure that it can function as expected. The installation process should adhere to best practices and regulatory requirements.

In summary, the selection of water pump pipelines is critical for the efficient and reliable functioning of a water supply system. The requirements include material selection, corrosion resistance, pressure rating, durability, pipe size, and installation requirements. By carefully considering these factors, water supply systems can function optimally and sustainably, providing clean and safe water to communities.