Thanks Matt and Tom. There will be an expert (i.e., not me) checking it out on site tomorrow and I will see about sharing the diagnosis here soon.
Brad From: Sprinklerforum [mailto:[email protected]] On Behalf Of Tom Duross Sent: Tuesday, July 17, 2018 8:52 AM To: [email protected] Subject: RE: Excessive Vibration of Pressure Relief Valve Have a vibration analysis performed. That will indicate balance, soft foot, alignment, bearing, even natural frequency as the source. To bad we're so far away from each other. From: Sprinklerforum [mailto:[email protected]] On Behalf Of Matt Grise Sent: Tuesday, July 17, 2018 9:32 AM To: [email protected] <mailto:[email protected]> Subject: RE: Excessive Vibration of Pressure Relief Valve Is the drain piping well supported? It would be worth checking to see if the motor is vibrating the pipe. Matt From: Sprinklerforum <[email protected] <mailto:[email protected]> > On Behalf Of Brad Casterline Sent: Tuesday, July 17, 2018 8:09 AM To: [email protected] <mailto:[email protected]> Subject: RE: Excessive Vibration of Pressure Relief Valve A little more info: I am being told the horizontal and vertical displacement due to vibration is about 5/8" and that this is unacceptable. The valve and discharge pipe size is per the chart, not calculated as allowed. The arrangement is Valve, flanged 90 looking down, spool piece to flange-spigot, goes underground and ties to storm drain. So I'm thinking 'water-hammer' is the culprit (talk about a beautiful but rather hairy hydraulic formula!). It would be quick and easy to cut a grooved check valve listed for vertical down into the spool, but I don't if it would 'check' the returning pressure shock wave. Does anyone here know? Thanks, Brad From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Monday, July 16, 2018 11:34 AM To: [email protected] <mailto:[email protected]> Subject: Excessive Vibration of Pressure Relief Valve Does anyone have any experience with the relief valve (for diesel driven fire pump) failing the vibration test? If so, can you tell me how it was corrected? Any experience with the discharge pipe being to anything other than atmosphere? Thanks, Brad
_______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
