RCM-2009 Reliability Centered Maintenance Managers' Forum - March 23-26 - Daytona Hilton Ocean Walk Village - Daytona Beach Florida Join or Manage Your Profile Posting Boards Machinery Condition Monitoring and Predictive Maintenance Posts About vibration/alignment/balance Questions on reciprocating piston pumps
Join or Manage Your Profile Posting Boards Machinery Condition Monitoring and Predictive Maintenance Posts About vibration/alignment/balance Questions on reciprocating piston pumps|
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I have been monitoring pistons pumps for quite some time and i noticed that the dominant peak on the pump spectrum tends to be the (Number of Pistons X 2). Anybody agree with me on this? And does anybody have the reasoning behind this?
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is it highest on the axial? 2 x could be from swash plate angle?
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The highest vibration does not necessarily come from the axial direction. These pumps are not using swash plates. They are driven by crankshafts.
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It seems very quiet on this topic...Any other feedback perhaps?
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Normally the No. of Pistons X RPM will be the dominent peak..
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2x is a pretty normal frequency to see in any reciprocating machine. What is the pump configuration, what kind is it?
e-mail me at steven dot schultheis at gmail dot com |
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Oops sorry, reread the post, are you talking about 2X rpm, or 2X number of pistons (Ie 6x in a triplex pump)?
That could well be an acoustic excitation if it is 2X the number of pistons... e-mail me at steven dot schultheis at gmail dot com |
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Steve,
I am talking about 2X number of pistons (6X in a triplex pump). Jenish, At first that was what i am expecting but instead it is 2X the number of pistons. Any reasoning behind this? |
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That is very likely an acoustic excitation in either the discharge or suction header.
Does the machine utilze a bladder style pulsation damper? If so when was the last time the charge was checked? Those things require maintenance, and very rarely get it... e-mail me at steven dot schultheis at gmail dot com |
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Is it possible you have two equally-spaced valve switching operations per piston cycle and you're seeing the vibration from those valve operations? In that case I'd think you'd also see harmonics of 6x.
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Steve,
Yeah, they do have a bladder style pulsation dampener on the discharge end. Electricpete, I will have to check on the valve switching operations on that reciprocating pump though. From trend wise, not much changes can be seen from the past 3 readings, so i guess this must a normal operations of the pump. I just wanted to see whether anybody else gets similar spectrum as i do and whether they have a reasonable explanation behind.  As far as I can see I guess I am the only one with the 2 X RPM X number of piston dominant peak? |
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RCM-2009 Reliability Centered Maintenance Managers' Forum - March 23-26 - Daytona Hilton Ocean Walk Village - Daytona Beach Florida Join or Manage Your Profile Posting Boards Machinery Condition Monitoring and Predictive Maintenance Posts About vibration/alignment/balance Questions on reciprocating piston pumps
Join or Manage Your Profile Posting Boards Machinery Condition Monitoring and Predictive Maintenance Posts About vibration/alignment/balance Questions on reciprocating piston pumps
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