Watermist nozzles

We offer certification of Watermist Nozzles against an LPCB Schedule of requirements, SD0231 Appendix 4.

As detailed in DPC Draft BS8489-1, 2015-04-24 clause 11.4 and SD0231 Appendix 3 (In service testing protocol) all LPCB approved watermist nozzles should be inspected and samples removed and tested at regular 3 yearly intervals.

Each entry details: 

  • Nominal orifice size in millimetres
  • Temperature ratings in degrees centigrade for automatic nozzles. For open nozzles the temperature rating is listed as N/A.
  • The heat sensing element is listed as follows:      
    †  indicates a glass bulb sensing element. No addition mark is used for other types of sensing element or open heads.
  • Nozzle type and orientation:
  1. U indicates that the nozzle should be installed in an upright orientation.
  2. P indicates that the nozzle should be installed in a pendent orientation.
  3. CC indicates that the nozzle is concealed and should be installed in the orientation designated by the manufacturer’s approval (U or P).
  4. W indicates that the nozzle should be installed on a sidewall
  • K-factor, the discharge coefficient in LPM/bar1/2, where LPM is litres per minute. 
  • Minimum and maximum design (operating) pressure, i.e. nozzle operating pressure, for a developed spray of water mist, in bar.
  • Minimum standby pressure, in bar.  The lowest pressure to which a closed automatic nozzle may be exposed prior to activation (either in a closed or flowing system). 
  • Maximum standby pressure, in bar.  The highest pressure to which a closed automatic nozzle may be exposed in a closed system (for the life of the system), e.g. maximum pressure maintained by jockey pump prior to activation.

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