# RE: spray bar versus deluge heads for opening protection

```Dude, you need serious help.   HAHA

Now how many average sprinkler designers could have figured that out?```
```
But it has to equal the discharge of spray nozzles which are required to
provide a minimum of 36 gpm at 40 psi around the perimeter.

Craig L. Prahl
CH2M
200 Verdae Blvd.
Greenville, SC  29607
Direct - 864.920.7540
Fax - 864.920.7129
CH2MHILL Extension  77540
craig.pr...@ch2m.com

-----Original Message-----
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On
Sent: Monday, September 19, 2016 10:37 AM
To: sprinklerforum@lists.firesprinkler.org
Subject: RE: spray bar versus deluge heads for opening protection [EXTERNAL]

(.25/24)^2 * PI = .000314 ft^2
assume coefficient of discharge of .9
.000314 *.9 = .000283

'imply' 7 PSI
7 / .433 = 16.167 (h)
v = (2gh)^.5 = 32.266 ft/sec

32.266 ft/sec * .000283 ft^3 = .00913 ft^3/sec, * 7.48 * 60 = 4.1 GPM

Q = 4.1
P = 7.0
K = 1.55

-----Original Message-----
From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org]
On Behalf Of craig.pr...@ch2m.com
Sent: Monday, September 19, 2016 9:11 AM
To: sprinklerforum@lists.firesprinkler.org
Subject: spray bar versus deluge heads for opening protection

Today's teaser.

An owner gives you this criteria for protecting a truck dock door opening.
A semi-trailer is parked at the opening up against the dock seal, the trailer
contains wooded pallets.

The rollup door and the trailer doors remain open at all times for in and out
access.

Their recommended method of protecting the opening is to use 1.5" pipe with
1/4" holes drilled every 6".  Provide this around the opening which is 12"
wide by 9' high.  This is approved by their international corporate safety
department.

This will be a deluge system for two dock doors.

How are you going to calculate this?

Craig L. Prahl
CH2M
200 Verdae Blvd.
Greenville, SC  29607
Direct - 864.920.7540
Fax - 864.920.7129
CH2MHILL Extension  77540
craig.pr...@ch2m.com

_______________________________________________
Sprinklerforum mailing list
Sprinklerforum@lists.firesprinkler.org
http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org

_______________________________________________
Sprinklerforum mailing list
Sprinklerforum@lists.firesprinkler.org
http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
_______________________________________________
Sprinklerforum mailing list
Sprinklerforum@lists.firesprinkler.org
http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
```