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Sprinkler system calculation
4

Sprinkler system calculation

Sprinkler system calculation

(OP)
Hello Friends,
I need to calculate sprinkler LPMM (LPM per 1 meter) spraying capacity.

I know that that we have 12rows*13 units/row =156 units for 1200 M2 of storage.
I also know that the pressure in the sprinkler piping system is 11-12 bar. Water is provided from 1000M3 tank by a 6'' pipe.

Any advise how to do this?

Best Regards
Roman Katz

RE: Sprinkler system calculation

Sounds like a fire sprinkler design?

Normally you find out how much each one needs - try looking and searching in the NFPA forum under engineering codes.

You really want a fire protection specialist.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Sprinkler system calculation

Not sure what you're trying to do, but if this is existing then you need to find the model no of the sprinkler and look it flowrate from the vendor for the pressure you have.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Sprinkler system calculation

If it is that old you should also check with UL to see if it has been recalled as defective.
There are a lot of those out there.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: Sprinkler system calculation

(OP)
Another question friends,

Water that is supplied is at 210 PSI pressure. There is additional 2'' pump 7.5KW, 15A that provides additional pressure. How can I calculate what addition(PSI) does that pump produce?

Best Regards
Roman Katz

RE: Sprinkler system calculation

By looking at the pump curve of the pump and knowing what flow you have.

You could guess by assuming a certain efficiency and a flow rate, but the pump curve is best. You can normally find it on the vendors website. Without flow you can't work anything out.

210psi is pretty high for a water supply line so not sure what your pump is doing there.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Sprinkler system calculation

(OP)
It is a pressure booster pump for a sprinkler system. I assume it is as old as the sprinklers, I only have a motor label.

But thanks anyway.

Best Regards
Roman Katz

RE: Sprinkler system calculation

Even to begin to guess / estimate pressure you need to have an idea what the flow is.

7.5kW, 15A sounds like 500V supply?? Doesn't sound right. What does the motor label actually say? No pump type , serial no or manufacturer??

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Sprinkler system calculation

Hi,
I believe the required pressure is about 12 bars , my experience . Why don't you perform a test or request a third party (contractor) to do it for you ?
They should have a way to test the system if the design is correct .
Good luck
Pierre

RE: Sprinkler system calculation

(OP)
It's about 12 bars indeed, As a sprinkler.
About 15m3/hr.

Thank you all, friends for the insights.

Best Regards
Roman Katz

RE: Sprinkler system calculation

Some of this testing is required maintenance. See NFPA 25 Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems
or your jurisdictions fire code.

These examples may provide some guidance.
2018 International Fire Code Appendix 1 Non Compliant Conditions
Existing Building Code
Building Maintenance Code

As mentioned above the NFPA (fire) Code Issues is a better place to explore fire code issues. If this system is in a chemical process, that will constrain the design occupancy which should be the basis of design for the system. It can get complex working through all of this, the process engineer and the fire protection engineer need to collaborate to get a good result. Your underwriter may have an engineering department that can help.

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