4.4 Water Flow and distribution
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Statutory Documents - IMO Publications and Documents - Resolutions - Assembly - IMO Resolution A.800(19) – Revised Guidelines for Approval of Sprinkler Systems Equivalent to that Referred to in SOLAS Regulation II-2/12 – (Adopted on 23 November 1995) - Appendix 1 - Component Manufacturing Standards for Water Mist Nozzles - 4 Water Mist Nozzle Requirements - 4.4 Water Flow and distribution

4.4 Water Flow and distribution

Parent topic: 4 Water Mist Nozzle Requirements

4.4.1 Flow constant (see 5.10 ) [6.4.1]

  4.4.1.1 The flow constant K for nozzles is given by the formula:

where:
P = is the pressure in bars;
Q = is the flow rate in litres per minute.

  4.4.1.2 The value of the flow constant K published in the Manufacturer's Design and Installation Instructions should be verified using the test method of 5.10. The average flow constant K should be within ±5% of the manufacturer's value.

4.4.2 Water distribution (see 5.11 )

 Nozzles which have complied with the requirements of the fire test should be used to determine the effective nozzle discharge characteristics when tested in accordance with 5.11.1. These characteristics should be published in the Manufacturer's Design and Installation Instructions.

4.4.3 Water droplet size and velocity (see 5.11.2 )

 The water droplet size distribution and droplet velocity distribution should be determined in accordance with 4.11.2 for each design nozzle at the minimum and maximum operating pressures, and minimum and maximum air flow rates, when used, as part of the identification of the discharge characteristics of the nozzles which have demonstrated compliance with the fire test. The measurements should be made at two representative locations:

  • .1 perpendicular to the central axis of the nozzle, exactly 1 m below the discharge orifice or discharge deflector; and

  • .2 radially outward from the first location at either 0.5 m or 1 m distance, depending on the distribution pattern.

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