sprinkler system calculations

[Firemaster]

Hi, looking for info. on fire sprinkler calculations.

 

That is a very broad question. What specifically are you looking for? NFPA 13, Chapter 8 outlines procedures for sprinkler calculations as far as what is required on working drawings. Other books are available by Gagnon, Bryan, and Broman that go into greater detail.

-- Trashcan Man

 

[rewatson]

Firsly, you need to know how to use the K value. It is the same as mechanical engineers use as Cv of valves.

Cv=gpm/√psi K=gpm/√psi

gpm=Cv*√psi gpm=Cv*√psi

psi=(gpm/Cv) psi=(gpm/Cv)

Second, You have to use the Hanzen-Willians pipe friction losses.

4.52 * Q1.85
p=________________
C1.85 * d1.87

where: P= Loss in psi per ft.
Q=gpm
C=Friction loss coefficient (c=120)
d=Inside diameter.

Now, you can look at pages from 13-247 to 249 of NFPA 13.

Rdgs,

rewatson

 

[MeckMan]

NFPA has a handbook titled "Automatic Sprinkler Systems" 1996/seventh edition.

It is an EXCELLENT reference. Not only does it have code text, but also explanatory notes and examples.

Chapter 6 deals with Plans and Calculations (Pipe Schedule and Hydraulic Calcualtions Methodes).

I greatly suggest you get yourself a copy. It will pay for itself in not time.

Regards

 

[MeckMan]

"not" = no

;-)