Fire Hydrants 1

[Adnan86]

I have a question related to Fire Hydrants. I always design a Sprinkler system for a building without bothering about a Fire Hydrant. I just Calculate the Demand Flow and Demand Pressure, Check the availability of the required pressure on City water and then decide to have a Fire pump. I want to know what considerations should I make for Fire Hydrants (if any). Any Previous thread on this topic will be a great help. Thanks in advance

 

[cdafd]

Are the fire hydrants in your scope of work??

If not the only thing I know is if the ahj has a distance requirent of hydrant to FDc.
Then sometimes the sprinkler designer gets involved with FDc or fire hydrant placement

 

[Adnan86]

Acutally its not in my scope of work. I do give Fire Department Connections in the building. If for example I consider no Fire Hydrant around the building, then Do I need to make such considerations in my Sprinkler Calculations.
My Post on Other Thread is quite similar to this. Please co-operate.

 

[cdafd]

As an ahj
We have a required distance from fire hydrant to an FDc

Hopefully this is taken care of during project conception

But if we get sprinkler plans and the fire hydrant is shown out if range.

A comment is given back to correct

This could be done by adjusting the location of the FDc,or fire hydrant

 

[fel3]

An FDC without a nearby FH isn't worth much because fire trucks don't carry that much water. It's the FH -> pumper truck -> FDC connection that makes the FDC useful. cdafd is correct about there being a required distance from FH to FDC. For example, the 2007 California Fire Code (which is at hand, while the 2010 code is not) covers the proximity of FHs and FDCs in §912. It's also in one of the NFPA standards, but I don't remember which one. As a civil, I have always coordinated FH and FDC locations with the project mechanical engineer.

==========
"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill

 

[Adnan86]

Thanks fel3 for your explanation. Now its clear that the while deciding the location of FDC, the location of FH is taken into account. Now speaking about the Fire Hydrant Pressure, How should I know the Fire Hydrant pressure and how that will effect my Hydraulic Calculations for Sprinkler system. Usually I consider the City water pressure available at the inlet of the building. How to perform Calculations for Fire Hydrant. Please help.

 

[cdafd]

"""""""""""Thanks fel3 for your explanation. Now its clear that the while deciding the location of FDC, the location of FH is taken into account. Now speaking about the Fire Hydrant Pressure, How should I know the Fire Hydrant pressure and how that will effect my Hydraulic Calculations for Sprinkler system. Usually I consider the City water pressure available at the inlet of the building. How to perform Calculations for Fire Hydrant. Please help. """"""""""""

do you mind stating what you do for a living???


buy a copy of this and follow it:::

http://www.nfpa.org/catalog/product.asp?pid=29102&cookie_test=1

 

[Adnan86]

"""do you mind stating what you do for a living???"""" What was that cdafd??

 

[cdafd]

Sometimes it is easier to answer a question posed, if you know where the author is coming from

 

[Adnan86]

Well cdafd, I work in Middle East in an Engineering Consultancy.

 

[DavidCR]

Hydrants for fire corps should consider enough pressure for the pumper to work depending on them or local law.
Hydrants for private use, like in an industrial site, could fall in the scope of NFPA 14, i.e. to provide hose stations or connections, so you have to guarantee certain hydraulic onditions or fire scenario, which may or may not involve other fixed systems like sprinklers, like in a combined system.