Caution with silver bullet use. On multistory may not work of air is trapped
out on intermediate floors.
Match bullet spec to type of vampire.
> On Jul 21, 2016, at 11:11, Charles Thurston wrote:
>
> Hello rongreenman,
>
> I have seen this before on a large grid with a 20 year old alarm valve
The cycling of the flowswitch is caused by air trapped in the system.
This is the reason that the current edition of NFPA 13 requires some sort of
vent or a remote ITV.
Potter has a technical memo on this subject, please see below.
Vane type waterflow switches should be tested using the inspecto
Tom,
Another good idea. The changing pitch at the back flow/riser location would
suggest that this could be the, or a cause. One of the weird pattern
Febco's but I can't recall which at the moment.
On Thu, Jul 21, 2016 at 11:08 AM, Tom Duross wrote:
> This happened once to me and it was the ba
Hello rongreenman,
I have seen this before on a large grid with a 20 year old alarm valve in it,
Air trapped in the grid was the problem, Found a large section where the mains
and branch lines had been raised over the drain, Had to run an Auxiliary Drain
off the high part to vent air and then a
This happened once to me and it was the backflow opening and closing checks,
does the pressure change on the gauge?
We took out the checks and it worked beautifully, then got both 3# checks and
it worked. Silver bullet.
If not, then I would agree on trapped air expanding and contracting.
I'm seeing a consensus here that the problem has to do with the cushioning
effect of air and that eliminating air inside the piping is a good idea.
On Thu, Jul 21, 2016 at 10:45 AM, Mark Phillips
wrote:
> Air Vent up High
>
>
>
> *From:* Sprinklerforum [mailto:
> sprinklerforum-boun...@lists.fir
Bruce,
This is a single story, though high bay, building. But large and expansive.
According to the tech he did the test last year and it worked properly.
This guy is pretty thorough though without a lot of experience. The
previous tech is very suspect (and fortunately no longer in the industry)
a
Air Vent up High
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On
Behalf Of rongreenman .
Sent: Thursday, July 21, 2016 1:15 PM
To: sprinklerforum@lists.firesprinkler.org
Subject: Resi Riser - Character set not allowed
Anyone experienced this before?
The original
Ed,
The main drain and ITV are combined like a test and drain. And I agree with
the air, but it's within the city system as this ITV is about three feet
from the DCVA. But lots of bends. UG there is a 4" 90, followed by another
five feet later running directly into the DCVA, then three more nineti
Ed types faster than I.
I've seen a four story office building that would do this indefinitely. Others
on the same cluster of buildings would by chance alarm during pressure
fluctuations up to five minutes after flow started. (Fitter showed me he could
trigger alarm by skilled use of main drai
I should have added that it is unusual to see the flow switch ahead of the main
drain.ain.
Sent from my Verizon Wireless 4G LTE smartphone
Original message
From: "rongreenman ."
Date: 07/21/2016 10:15 AM (GMT-08:00)
To: sprinklerforum@lists.firesprinkler.org
Subjec
Ron i bet you have a very large system or a multi storage building. You're
looking at the effect of a lot of hair in the piping. It is a pretty common
experience. One way to avoid it is to fill the system with the ITV open.
Usually this will eliminate a lot of the trapped air
Sent from m
Anyone experienced this before?
The original CSC version of the Tyco rest riser in four inch.
http://tyco-fire.com/index_link.php?link=TFP962&_ga=1.123267982.464632162.1469119864
Flow throw the IT port and you can watch the lever in the flow switch move
and then, before alarming, move back to th
To my understanding: Yes and yes.
On Thu, Jul 21, 2016 at 9:31 AM, Todd Williams wrote:
> Section 11.1.2 permits a higher hazard area within a larger space to be
> protected with sprinklers over the hazard and 15 ft beyond. Since nothing
> is stated, I assume this can be done with a dry system.
The total remote area should be increased by 30% but no increase needed for the
15 ft.
Richard Carr, SET
Branch Manager
Cox Fire Protection, Inc
6555 Grace Lane.
Jacksonville, Fl. 32205
rc...@coxfire.com
904-781-8227
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On
Section 11.1.2 permits a higher hazard area within a larger space to be
protected with sprinklers over the hazard and 15 ft beyond. Since nothing
is stated, I assume this can be done with a dry system. Is a 30% increase
in area for the calculation required?
Todd G Williams, PE Fire Protection
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