The number of solenoid valves. I am trying to find the link online that has a 
good example...

Duane Johnson, PE
Program Manager
Division of the Fire Marshal (Contractor)
Office of Research Services 
National Institutes of Health 
301-496-0487

"Protecting Science - One Sprinkler at a Time"


-----Original Message-----
From: [email protected] [mailto:[email protected]] 
Sent: Monday, June 30, 2014 9:13 AM
To: [email protected]
Subject: RE: Identification of preaction system types

Ok, So what would be the tell-tale difference?

Craig L. Prahl 
Fire Protection Group Lead
CH2MHILL
Lockwood Greene
1500 International Drive
Spartanburg, SC  29303
Direct - 864.599.4102
Fax - 864.599.8439
CH2MHILL Extension  74102
[email protected]



-----Original Message-----
From: Sprinklerforum [mailto:[email protected]] On 
Behalf Of Johnson, Duane (NIH/OD/ORS) [C]
Sent: Monday, June 30, 2014 9:12 AM
To: '[email protected]'
Subject: RE: Identification of preaction system types

Nope. You have to look at the trim on the preaction valve.

Duane Johnson, PE
Program Manager
Division of the Fire Marshal (Contractor) Office of Research Services National 
Institutes of Health
301-496-0487

"Protecting Science - One Sprinkler at a Time"

-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Monday, June 30, 2014 9:09 AM
To: [email protected]
Subject: Identification of preaction system types

Can you identify the type of preaction system installed just by looking at the 
system riser?

I have a warehouse, unheated, Preaction system of unknown type.  There are heat 
detectors at the roof deck and there is a small air compressor.

That's all I've got to go on.  I can make assumptions all day long, but no 
assumption is better than an incorrect assumption at this point.

Craig L. Prahl
Fire Protection Group Lead
CH2MHILL
Lockwood Greene
1500 International Drive
Spartanburg, SC  29303
Direct - 864.599.4102
Fax - 864.599.8439
CH2MHILL Extension  74102
[email protected]


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