Tom,
This is diesel engine driven but I was thinking about your vibration
analysis comment, 'soft foot', 'natural frequency'..., and I flashed
back on an acceptance test of an electric motor driven I had designed
and got to witness. Owner, Insurance, AHJ, Pump Rep- everyone is
there. Churn hits steady state quickly, fitter looks at me, gets a
nickel out of his pocket, says watch this, and has the audacity to
stand the nickel up on top of the motor, centered both ways!
It was a Friday so afterwards a very long lunch for everyone with lots
of cold drinks was on me- and I just kept picturing that nickle
standing there.
Anyway, back in the present Friday I thought to myself, "I bet Tom has
done that"!
:) Brad
Quoting [email protected]:
Well, nothing to share.
For some reason the valve was not acting up yesterday like it did in
the report.
Another reason why I think it has something to do with the discharge
pipe going underground and tieing in to storm drain. Who knows what
size that is, how many 90s, how far it is to the treatment plant or
wherever the outlet is, and the conditions there. Maybe there was
some gum in the works that day.
Brad
Quoting Brad Casterline <[email protected]>:
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
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