Differences between Tree, Gridded and Looped systeme 1

[yassinemzili]

hy every body and thank's for all your answers that you give me befor.

My question for now is what are the differences between Tree, Gridded and Looped systemme, not how to distinghuish them ,because I know that, but how to choose between this three systemes in a given area?
is there any advantages or disadvantages to choose one or the other?

 

[cdafd]

Sounds like you need to take some design classes and not online

Before you cost someone money or a building burns down

 

[b1ueshift]

Well, when I was working in the US, almost every large rectangular area had a gridded system because it's the most cost effective design. Other countries I've worked in are not so efficient perhaps because designers just don't have the knowledge. It also required a bit of skill on the part of the installers to get all the pipe to meet up.

Not many contractors are using loops (in my experience). The advantage is not much and it takes a bit of skill and labour to get the two ends of the loop to meet up properly.

I live and work in Dubai now and this place is full of people designing sprinkler systems who don't have the appropriate skills and knowledge and simply wouldn't be employable in the US. Maybe Morocco is the same.

Anyway you should check out Amazon.com and get yourself a book on sprinkler design.

 

[yassinemzili]

thank's for the explanation.

what I understand is that the big difference is at the installation of the system.
As you expected, it's the same thing here in Morroco, there are no professionals in sprinkler systeme. For me I am in training and I face a lot of broblems in understanding NFPA13 because my boss that wokr for some years in the field of automatic sprinkler systeme don't know big things, so I start from zero with no help, and no one in the company knows something about sprinklers.
I have the NFPA 13 and another book called "Desing and layout Fire Sprinkler System" it's pretty good for beginners but don't get to details and similarity that we face in the NFPA13.

 

[SprinklerDesigner2]

yassinemzili,

Do you have a web page or something where I can get an email?

Emails themselves are frowned on.

 

[stookeyfpe]

http://ce.ceat.okstate.edu/courses/bpafsp.asp

 

[yassinemzili]

SprinklerDesigner2

This is mine yassine.mzili@gmail.com

 

[SuperiorFire]

Different situations call for different system types.
Gridded systems allow the water multiple pathways through the system to the operating sprinklers. This means the water travels slower, and we know friction loss increases as the velocity increases, so if a grid reduces the velocity of the water, there is less psi lost due to friction. This lets you reduce the pipe size of the lines. This system is used in retail/commercial spaces, warehouses mand sometimes residential. It works really well hydraulically, and makes tenant improvement projects much easier and faster (cost effective).

Gridded systems shall not be used for dry pipe systems. Now the slow moving air will not leave the system fast enough to trip the dry valve. So dry systems will be Tree, or Looped systems. While looping a system almost always improves the hydraulics, sometimes it is not possible, or just not necessary (small systems, or systems with good water pressure).

With experience you will know which to use when, and why.

Superior Fire Protection Systems
Protectiong Lives and Property since 1986.

Vancouver, British Columbia

http://www.superiorfireprotection.ca

 

[MGXFP]

NFPA 13's appendix has illustrations of all three types of systems.

If you use a grid, don't forget the pressure relief valve!

The book written by Robert Gagnon is a great starter to learn from.

http://www.amazon.com/Design-Water-Based-Fire-Protection-Systems/dp/0827378831

a colleague has it and I've read it cover to cover and the text is very easy to understand and it includes many examples to work problems from.

 

[chicopee]

I can think of cost of installation and material, water availability (pressure and flow rate from municipal or private watere source)and size of area to be sprinklered being factors.

 

[pipesnpumps]

>>If you use a grid, don't forget the pressure relief valve!<<

Yep, and the 2010 version of 13 requires a relief valve for all wet systems of any type.



Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in small increments during moments of panic or curiosity.