Of Tom Duross
Sent: Wednesday, March 19, 2008 6:11 PM
To: sprinklerforum@firesprinkler.org
Subject: RE: Dry Pipe Valve going wet
If all this is because a DPV won't seat, try plain old oatmeal.
A handful around the clapper, prime it and it works every time.
An old timer taught me this and it's never
: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Duross
Sent: Wednesday, March 19, 2008 6:11 PM
To: sprinklerforum@firesprinkler.org
Subject: RE: Dry Pipe Valve going wet
If all this is because a DPV won't seat, try plain old oatmeal.
A handful around the clapper, prime
- Original Message -
From: Tom Duross [EMAIL PROTECTED]
To: sprinklerforum@firesprinkler.org
Sent: Wednesday, March 19, 2008 5:10 PM
Subject: RE: Dry Pipe Valve going wet
If all this is because a DPV won't seat, try plain old oatmeal.
A handful around the clapper, prime it and it works every time
Hi Pete,
If the system went wet then the pressure switch is activated and the
fire panel should be in full fire. You would not be able to reset the
alarm unless; I believe the system is drained. Also the low air alarm
would keep the panel in trouble. This means if there is a fire the
system would
Hello Peter,
See Below
Wednesday, March 19, 2008, 4:07:59 PM, you wrote:
Forum Members:
If a dry pipe valve trips and goes wet, is there any reason why you
couldn't leave the system piping filled with water assuming that the
weather is not cold enough to freeze it?
We do this around here
The clapper would have to be down to close water and pressure on the alarm
switch which normally has no pressure against it. Plus, the high low switch
(assuming it has one) would be in alarm due to 3-5 times the pressure (with
water as opposed to air) on it. I don't think the external reset
, Peter A
Subject: Re: Dry Pipe Valve going wet
Hello Peter,
See Below
Wednesday, March 19, 2008, 4:07:59 PM, you wrote:
Forum Members:
If a dry pipe valve trips and goes wet, is there any reason why you
couldn't leave the system piping filled with water assuming that the
weather is not cold
On differential dry valves, the surface area of the top of the seat is
several times the water seat dimension. If a column of water of sufficient
height is allowed to remain on top of this valve, the seat will never raise
and allow a forward flow.
I believe there is something in NFPA that
In the tripped mode the water would be flowing out the alarm line to the bell
or pressure switch. The clapper would be in the latched position. If the
clapper is not latched and is on the seat the water column probably would
prevent it from operating. This could be a dangerous situation. In
What about the alarm Pete? The valve to the WMG or pressure switch
must be turned off after the DPV trips. One could add a waterflow
indicator and pretend it is a shotgun riser.
Ed
On Wed, Mar 19, 2008 at 1:07 PM, Larrimer, Peter A
[EMAIL PROTECTED] wrote:
Forum Members:
If a dry pipe
If you're talking about paddle or vane type flow switches these are only
allowed in wet systems. In fact since NFPA actually defines accepted types
of systems and a wet/dry combination (I'm not talking about an auxiliary dry
off a wet but one that is both things) is not mentioned then I'd say
If all this is because a DPV won't seat, try plain old oatmeal.
A handful around the clapper, prime it and it works every time.
An old timer taught me this and it's never failed.
The oatmeal will dilute should the valve ever trip and with all that water,
be negligible.
As far as the water column,
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