Currently we are facing issues with high vibrations on pipings induced by the waterstroke effect (counter-pressure in supply pipings that makes all pipings vibrate ). Setup: liquid is supplied to a header with a centrifugal pump, pressure around 1.5 bar. Header feeds a series of multiple fine dosing gear pumps (each gear pump delivering around 3 ml per dosing at a high ratio, around 200 dosings per minute.) When each dosing cycle has ended the gear pump has to deliver a suckback (gear pump runs the opposite direction to ensure that the cut off of the dosing is 100% correct otherwise serious quality issues occur. This so-called suckback induces a conflict with the pressure delivered by the centrifugal pump and results in high vibrations on pipings. These vibrations will lead to pump damage, coupling issues, pipings, weldings, etc. Currently, I am looking for a smart solution to counter this problem. I am thinking of a way to capture these pressure variations. This will result in a reduction off vibrations on the pipings and installation. Can you give feedback and analysis regarding this issue and advise which device and which manufacturer can solve this issue?
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Ross Mackay Forum Moderator 95 Posts
Re: How can we reduce vibration on pipes to avoid quality issues?5 December 2012 at 4:11pmI was intrigued by the use of a "suckback" event to cut off the dosing quickly and to eliminate possible quality issues.
Surely the best way to accomplish this would be to have a 3-way valve on the outlet of the dosing pumps close quickly and redirect the flow through the gear pump back to the source of the centrifugal pump feeding the header. A valve will close quicker than a gear pump can reverse direction and with much less turbulence and pressure variations in the system. This will result in a smoother operation with fewer failures.