Stainless steel centrifugal pump cavitation resistance on how to improve -

we must attach great importance to the stainless steel centrifugal pump cavitation phenomenon. Below will be detailed instructions on how to improve the cavitation resistance of stainless steel centrifugal pump:

a, liquid into the device effective measures of NPSH:

( 1) Change the upper suction device to reflux device.

( 2) Reduce the installation height of pump suction device.

( 3) Before increasing centrifugal pump storage tank liquid level pressure, increase effective cavitation allowance.

( 4) Reducing the loss of before the pump pipeline flow. For example, within the scope of the requirements as far as possible to shorten the pipeline, reduce the flow velocity in the pipe, reducing elbow and valves, as far as possible to increase the valve opening.

2, to improve the performance of centrifugal pump cavitation resistance measures

( 1) Improvement from the pump suction to the structure near the impeller design. Increase the circulation area; Impeller cover plate inlet part of the radius of curvature increases, in order to reduce the liquid flow accelerated sharply and the reduced pressure. Reduced the thickness of the blade inlet and make the blade inlet round to make it close to streamline, can also reduce the acceleration and pressure drop around the head of blade. For enhancing the inlet parts of impeller and blade surface finish, in order to reduce resistance losses; Blade inlet edge to the impeller inlet and liquid flow reception work in advance, and the pressure increases.

( 2) If the double suction impeller from impeller are allowed on either side of the flow at the same time, import cross section will double the import flow rate will be doubled.

( 3) The feeling should be round the fluid flow in the feeling should be round work ahead of time, to increase the flow of pressure.

( 4) Use of cavitation resistance materials. Practice shows that the strength of the material, the higher the hardness and toughness, better chemical stability, the stronger the cavitation resistant capacity.

( 5) Design a larger positive impact Angle is used to increase the blade inlet Angle, reduce the bending blade inlet, reduce congestion, increase the import area; To improve the working conditions under the 'big' flow, reduce the flow loss. Positive impact Angle, however, cannot too big, otherwise it will affect the efficiency.