Fire protection

British Standard 5839.

There are computer programs for fire sprinkler system layout.

You have to know available pressure and flow rate of the water main.

Normally you need to be licensed to do that. You certainly need to know the details of the hardware for such systems.

In short sprinkler systems are a highly specialized occupation.

Your best bet is to find a local fire sprinkler company and at least pay them to design a system on their computers.

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One code of practise you can follow is that of FOC, Fire Office Comission from the UK, which is usually adopted by Commonwealth countires. Not sure it is replaced by other code. For five storey, it is not tall, the water pressure from the fire engine pump should be able to pump the water to that height. Hence you do not required wet risers but since it is commerical building, dry risers are needed. Sprinklers system are also needed together with hose reel system. Sprinklers system have different rating depending on the degree of protection required which in turn depends on the hazard and the insurance level. The design need to be approved by the relevant authority. After completion of the building, a as-build drawing drawn by the main-contractor will have to be kept by the authority usually the one in charge of the building code and the fire safety, one by the fire station that is responsible for your area (the fireman will study the design while they are on the way to the burning building), one for the owner and one by the designer. You need to check with the architect on any special care for cleanroom and computer room. Sometimes it is best to use dry (non-water) protection system. In the past it is halon but due to CFC based, it is replaced by others. Note that fire protection system also applies on air-con and ventilation duct (which required fire-rated air shutter, those that closed the duct when fire melt the lead holding it open) and pressurised internal stairwell. As you can see that this is a rather professional job and with life at stake, the design is done by registered professional engineering firm.