Prevent pipeline to shake
As a result of,eduction carries a fluid inertial obstruction, move in pump begin the instant, the meeting is pulsatile to pipeline generation bump force. This is the peculiar phenomenon of reciprocating type pump, because be quickened suddenly and the liquid inside conduit is caused,be.
Appear to prevent to produce this kind of phenomenon, we ask eduction carries inertial obstruction (Pid) ＜ 1.0kgf/cm2, when Pid achieves 1.0kgf/cm2, pipeline shakes with respect to meeting generation, can cause bad influence to pump and its peripheral.
Solve method: 1. Install pulsatile damper;
2. increases to exit carries pipeline diameter and shorten the length that exports pipeline.
◆ prevents excessive supply
Because flow of the liquid in pipeline is inertial,excessive supply is, affect the regular job of check valve, make check valve invalidation, the flow that brings about pump thereby is not too big, steady. Every time inspiratory end negative pressure is not worth or pipeline grows too, produce this kind of phenomenon likely. Accordingly, we ask: The Pi of inertial obstruction of the ＞ that press difference of pump (in the entrance is carried or exporting end bigger person) .
Solve method: 1. Install pulsatile damper;
2. installs back pressure a powerful person;
3. shortens as far as possible the length of pipeline of imports and exports;
◆ prevents cavitation erosion happening
Be like surplus of device cavitation erosion (NPSHa) is insufficient, pump may flow because of breaking or cavitation erosion is damaged. So, surplus of cavitation erosion of our requirement device, surplus of NPSHa ＞ indispensible cavitation erosion (NPSHr) , NPSHa=Pa-Pv±Phs-Pis ＊ (choose in ＊ or Pfs bigger person) .
Pa: The absolutely pressure Kg/cm2Pv of fluid face: The Kg/cm2Phs of vapour pressure force of fluid face: Spend into Shui Duangao (with fluid face height) opposite pressure (Kg/cm2, swarm into type to suck ” of collection “ ＋ , type sucks to suck collection “ on - ”Pis: Carry inertial obstruction Kg/cm2Pfs into water: Carry conduit obstruction Kg/cm2 into water
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