Will any one can help me out to find the procedure to calculate the water demand for the mixed hazards of ordinary and light hazards with 6 risers in a 3 towers. How many stand pipes I have to consider and as per nfpa calculation if you can give me answer I will be thankful to you
Regards
Pvs

Get in touch with Assured Fire & Security, they specialize in Fire suppression systems (http://www.assured-ltd.co.uk/supression.html), including sprinklers.

:)

I hope they help

This is very tall order. There is not enough space in here to explain all the things involved. You need to read many NFPA codes.

In simple terms the distance between stand pipe should be maximum 30 meters.

As For water requirement use a software to calculate flow required then check with local authorities or NFPA code for the duration