Acceptable Vibration limit of Fire pumps

Installation contractors though they may have credible references for vibration limits, contractually the limits are what is in the contract. If your client did not specify them or he authorized you, an important source for the appropriate limits is the standards used in the pump selection which may vary from industry to another. API, HI, BS and ISO give plenty of details.

Another source of the limits is the pump system packager-though some packagers provide a bit loose limits and usually these limits are for stable operations not for commissioning.
quote:
Originally posted by Shurafa:
Installation contractors though they may have credible references for vibration limits, contractually the limits are what is in the contract. If your client did not specify them or he authorized you, an important source for the appropriate limits is the standards used in the pump selection which may vary from industry to another. API, HI, BS and ISO give plenty of details.

Another source of the limits is the pump system packager-though some packagers provide a bit loose limits and usually these limits are for stable operations not for commissioning.



Hi Shurafa,

In the contracts the limits was as per the standard (not mentioned which standard). Now they are telling it is the HIS standard. But after installation & various adjustments, we are getting the results as per the data sheet attached. Now the client is not accepting the result. Actually the vibration differs in no load & full load condition. Can you suggest which should be considered as actual? Can anybody suggest after going through the attachment what rectification should be done to bring each to acceptable limit?

Thanking you,

Ratan

Attachments

quote:
Originally posted by Ratan:
quote:
Originally posted by Shurafa:
Installation contractors though they may have credible references for vibration limits, contractually the limits are what is in the contract. If your client did not specify them or he authorized you, an important source for the appropriate limits is the standards used in the pump selection which may vary from industry to another. API, HI, BS and ISO give plenty of details.

Another source of the limits is the pump system packager-though some packagers provide a bit loose limits and usually these limits are for stable operations not for commissioning.



Hi Shurafa,

In the contracts the limits was as per the standard (not mentioned which standard), Now ther are saying the standard is HIS. but after installation & various adjustments, we are getting the results as per the data sheet attached. Now the client is not accepting the result. Actually the vibration differs in no load & full load condition. Can you suggest which should be considered as actual? Can anybody suggest after going through the attachment what rectification should be done to bring each to acceptable limit?

Thanking you,

Ratan
The vibrations at the normal/designed loads are those that are considered for acceptance evaluation.

In general, a commissioning limit of 5 mm/sec is reasonable. Engines should have a higher limit; maybe around 10 mm/sec. At the time of project completion and handing over to the owner, the vibrations have to be within the limits or a compromise has to be agreed on like buying some additional spare parts to close the contract.

Reducing the vibration levels require case by case exploration with more details. You may consider hiring a vibration specialist to help but you can also ask questions here.
quote:
Originally posted by Shurafa:
The vibrations at the normal/designed loads are those that are considered for acceptance evaluation.

In general, a commissioning limit of 5 mm/sec is reasonable. Engines should have a higher limit; maybe around 10 mm/sec. At the time of project completion and handing over to the owner, the vibrations have to be within the limits or a compromise has to be agreed on like buying some additional spare parts to close the contract.

Reducing the vibration levels require case by case exploration with more details. You may consider hiring a vibration specialist to help but you can also ask questions here.


Hi Shurafa,

Thank you for the replay. Actually the client is now telling the reference standard of HIS. I am not having the standard. Can anybody help me to send the HIS standard what it is telling about the vibration limit permissable in our case?

Thanking you,

Ratan
Hi Shurafa,

By mistake i have written the vibration limit in PO was 5 mm/sec. But it is not. Actually in the contract it was mentioned the vibration limit should be as per the standard (Not mentioned which standard) now the end user is telling the standard is HIS & the limit is 5 mm/sec. But i am not having the HIS standard. Can you tell me what is the exact limit permissable in our case for different pumps as per HIS standard.

Thanking you,

Ratan
To avoid confusion, the 5 mm/sec I mentioned is referring to your post (before you edited it.)

Sorry I do not have the HIS. I remember it shows different setups (horizontal, vertical, between bearing, overhang etc.) so one has to refer to the correct (applicable) standard and pump setup.
quote:
Originally posted by John from PA:
Are you the pump manufacturer?


Hi John,

No we are not the pump manufacturer. We are the installation contractor. Can in any way you help us to find out what the actual HIS standard tells so that we can compare with the reasult output.

Have you any suggestion in our case after reading the observed datas?

Thanking you,

Ratan

Thanking you,

Ratan
quote:
Originally posted by Shurafa:
The vibrations at the normal/designed loads are those that are considered for acceptance evaluation.

In general, a commissioning limit of 5 mm/sec is reasonable. Engines should have a higher limit; maybe around 10 mm/sec. At the time of project completion and handing over to the owner, the vibrations have to be within the limits or a compromise has to be agreed on like buying some additional spare parts to close the contract.

Reducing the vibration levels require case by case exploration with more details. You may consider hiring a vibration specialist to help but you can also ask questions here.


Hi Shurafa,

Sorry for my mis communication regarding the PO. Do you know any Vibration specialist contact detail so that we can seek help from him?

Thanking you,

Ratan

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