Exhausters

[Charles Thurston]

Hello Sprinklerforum,

I am sure this topic has been exhausted in the past, but I did not find a definitive answer anywhere. Does anybody still make an exhauster for Dry Sprinkler systems. We are having issues whit a system installed many years ago. Water delivery is 4-5 minutes to the inspectors test.

System starts out in building A as a 6" runs across the building feeding sprinklers in it, Then drops 12 feet to go underground 25 feet to building B and comes back up. This pipe underground is holding water. Open Inspectors test and it is 2 minutes before you start to see the sir gauge at the riser start to drop. We have written it up on inspections for years as too long of a trip time and the AHJ never said anything to our customer so they would get it fixed. NOW the AHJ will not let a remolded store open because the trip time is too long. The AHJ also "insisted" they install a waterflow switch for this space, NOW it had a Vane type switch on the dry pipe.

[Mike Stossel]

I tried to get a hold of one about 2 years ago. I contacted all of the manufacturers and they all said they no longer make them and did not have any old stock remaining.

   Mike Stossel
   NICET Level IV
Automatic Sprinkler System Layout
1070 38th Street
   Brooklyn N.Y. 11219
   Office: 718-633-3036 ext 114
   Fax:      [phone]
   ***@safetyfiresprinkler.com 
  www.safetyfiresprinkler.com 

-----Original Message-----
From: Sprinklerforum [mailto:sprinklerforum-***@lists.firesprinkler.org] On Behalf Of Charles Thurston
Sent: Thursday, June 16, 2016 9:37 AM
To: ***@lists.firesprinkler.org
Subject: Exhausters

Hello Sprinklerforum,

I am sure this topic has been exhausted in the past, but I did not find a definitive answer anywhere. Does anybody still make an exhauster for Dry Sprinkler systems. We are having issues whit a system installed many years ago. Water delivery is 4-5 minutes to the inspectors test.

System starts out in building A as a 6" runs across the building feeding sprinklers in it, Then drops 12 feet to go underground 25 feet to building B and comes back up. This pipe underground is holding water. Open Inspectors test and it is 2 minutes before you start to see the sir gauge at the riser start to drop. We have written it up on inspections for years as too long of a trip time and the AHJ never said anything to our customer so they would get it fixed. NOW the AHJ will not let a remolded store open because the trip time is too long. The AHJ also "insisted" they install a waterflow switch for this space, NOW it had a Vane type switch on the dry pipe.

[Bill Cunningham]

The problem may be the auxiliary underground not be drained, I have seen dry systems not fully drained taking considerably longer to trip than when it was fully drained. The trapped water may be delaying the trip time of the dry valve.
Bill Cunningham



Sent from my iPhone

Post by Charles Thurston
Hello Sprinklerforum,
I am sure this topic has been exhausted in the past, but I did not find a definitive answer anywhere. Does anybody still make an exhauster for Dry Sprinkler systems. We are having issues whit a system installed many years ago. Water delivery is 4-5 minutes to the inspectors test.
System starts out in building A as a 6" runs across the building feeding sprinklers in it, Then drops 12 feet to go underground 25 feet to building B and comes back up. This pipe underground is holding water. Open Inspectors test and it is 2 minutes before you start to see the sir gauge at the riser start to drop. We have written it up on inspections for years as too long of a trip time and the AHJ never said anything to our customer so they would get it fixed. NOW the AHJ will not let a remolded store open because the trip time is too long. The AHJ also "insisted" they install a waterflow switch for this space, NOW it had a Vane type switch on the dry pipe.
--
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[Charles Thurston]

Hello Bill,

We know that is an issue, They will have to install a vault in the walkway space between the building to put a drain into to fix that.

Post by Bill Cunningham
The problem may be the auxiliary underground not be drained, I have seen dry systems not fully drained taking considerably longer to trip than when it was fully drained. The trapped water may be delaying the trip time of the dry valve.
Bill Cunningham
Sent from my iPhone

Post by Charles Thurston
Hello Sprinklerforum,
I am sure this topic has been exhausted in the past, but I did not find a definitive answer anywhere. Does anybody still make an exhauster for Dry Sprinkler systems. We are having issues whit a system installed many years ago. Water delivery is 4-5 minutes to the inspectors test.
System starts out in building A as a 6" runs across the building feeding sprinklers in it, Then drops 12 feet to go underground 25 feet to building B and comes back up. This pipe underground is holding water. Open Inspectors test and it is 2 minutes before you start to see the sir gauge at the riser start to drop. We have written it up on inspections for years as too long of a trip time and the AHJ never said anything to our customer so they would get it fixed. NOW the AHJ will not let a remolded store open because the trip time is too long. The AHJ also "insisted" they install a waterflow switch for this space, NOW it had a Vane type switch on the dry pipe.
--
Best regards,
_______________________________________________
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http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org

[Ed Vining]

I had a similar sprinkler system layout, but the underground was about
twice as long long. The water delivery time was well within the
requirements. The water in the underground reduces the amount of air in
the system, My bet is that the water in the underground would reduce the
water delivery time, rather than increase it.

When water does get to the inspectors test does the stream appear to be
obstructed? I wonder what a pressure gage at the ITV would read when water
is flowing.

Post by Charles Thurston
Hello Sprinklerforum,
I am sure this topic has been exhausted in the past, but I did not find
a definitive answer anywhere. Does anybody still make an exhauster for Dry
Sprinkler systems. We are having issues whit a system installed many years
ago. Water delivery is 4-5 minutes to the inspectors test.
System starts out in building A as a 6" runs across the building feeding
sprinklers in it, Then drops 12 feet to go underground 25 feet to building
B and comes back up. This pipe underground is holding water. Open
Inspectors test and it is 2 minutes before you start to see the sir gauge
at the riser start to drop. We have written it up on inspections for years
as too long of a trip time and the AHJ never said anything to our customer
so they would get it fixed. NOW the AHJ will not let a remolded store open
because the trip time is too long. The AHJ also "insisted" they install a
waterflow switch for this space, NOW it had a Vane type switch on the dry
pipe.
--
Best regards,
_______________________________________________
Sprinklerforum mailing list
http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org

[Charles Thurston]

Hello Ed,

Get solid flow after about 2 min and for about 45 seconds to 1.5 min then it goes to sputtering and then you get solid waterflow.

I had a similar sprinkler system layout, but the underground was about twice as long long. The water delivery time was well within the requirements. The water in the underground reduces the amount of air in the system, My bet is that the water in the underground would reduce the water delivery time, rather than increase it.
When water does get to the inspectors test does the stream appear to be obstructed? I wonder what a pressure gage at the ITV would read when water is flowing.
Hello Sprinklerforum,
I am sure this topic has been exhausted in the past, but I did not find a definitive answer anywhere. Does anybody still make an exhauster for Dry Sprinkler systems. We are having issues whit a system installed many years ago. Water delivery is 4-5 minutes to the inspectors test.
System starts out in building A as a 6" runs across the building feeding sprinklers in it, Then drops 12 feet to go underground 25 feet to building B and comes back up. This pipe underground is holding water. Open Inspectors test and it is 2 minutes before you start to see the sir gauge at the riser start to drop. We have written it up on inspections for years as too long of a trip time and the AHJ never said anything to our customer so they would get it fixed. NOW the AHJ will not let a remolded store open because the trip time is too long. The AHJ also "insisted" they install a waterflow switch for this space, NOW it had a Vane type switch on the dry pipe.
--
Best regards,
_______________________________________________
Sprinklerforum mailing list
http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org

[Ed Vining]

"Get solid flow after about 2 min and for about 45 seconds to 1.5 min then
it goes to sputtering and then you get solid waterflow."
Does this conflict with your initial statement? " Water delivery is 4-5
minutes to the inspectors test."

Possibly there is some water trapped in the piping in the building in which
the ITV is located.

I wonder too if the vane in the WFI might have blown off and is resting
somewhere downstream.


Ed

Post by Charles Thurston
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[Charles Thurston]

Hello Ed,

That is after about the 2 min it takes the riser to trip.

"Get solid flow after about 2 min and for about 45 seconds to 1.5 min then it goes to sputtering and then you get solid waterflow."
Does this conflict with your initial statement? " Water delivery is 4-5 minutes to the inspectors test."
Possibly there is some water trapped in the piping in the building in which the ITV is located.
I wonder too if the vane in the WFI might have blown off and is resting somewhere downstream.
Ed
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