BS EN 15767-2:2009 pdf download – Portable equipment for projecting extinguishing agents supplied by fire fighting pumps — Portable monitors Part 2: Water nozzles
4.1.3 Flow adjustment positions
The settings of the water nozzle equipped with selectable flowrate shall be easily identifiable by visual means.
4.1.4 Jet adjustment positions
The different jet positions of a nozzle equipped with adjustable jet positions shall be clearly marked.
The materials used shall be selected in such a way that all the requirements in Clause 4 are met, subject to the tests defined in Clause 5.
The water nozzle shall pass the heat and frost tests defined in 5.3.
4.3.1 The combination nozzle with Q max less than 2 000 l/min, when tested in accordance with 5.4, shall be able to clear or flush a steel ball of 6,35 mm diameter without shutting off the nozzle.
NOTE This should be accomplished either through the full open nozzle position or through a flush feature of the nozzle. In nozzles with flowrate over 2 000 l, blockage due to debris is not likely because of the larger opening of the nozzle.
4.3.2 Water nozzles equipped with a flush feature shall have a mechanical and/or visual device to indicate to the user when the flush feature is being engaged.
4.4 Hydraulic characteristics
4.4.1 Pressures The following pressures, measured at the nozzle inlet, shall be used for the determination of the hydraulic characteristics:
reference pressure: p R = 6 bar ± 0,1 bar;
median pressure for automatic water nozzle: p m ;
nominal pressure: p N = 1 6 bar;
test pressure: p t = 25,5 bar.
All flowrates indicated on the nozzle shall be measured at straight jet and at the maximum spray angle position at the reference pressure p R .
The flowrates measured at the reference pressure p R shall not deviate by more than – 0/+ 1 0 % of the flowrate setting of the nozzle.
NOTE The deviation should also apply when the shape of the stream is altered.
4.4.3 Effective throw
The water nozzle shall achieve, for each flowrate position above 500 l/min, a minimum effective throw d eff as shown in Figure 1 , when set to a straight jet at the reference pressure.
For water nozzles above 4 000 l/min, the minimum effective throw shall be at least 60 metres.
4.4.4 Spray jet
The spray jet shall have a spray angle of at least 1 00°.
4.4.5 Automatic water nozzles
For automatic water nozzles, the regulation range (pressure at the beginning of the range and pressure at the end of the range) shall be stated in the documentation accompanying the product, from which the median pressure is calculated.
The flow should be set at both the minimum and maximum flow and the pressure for each shall be read.
This pressure shall not deviate from the median pressure by more than 30 %.
The nozzle shall show no leakage during 1 min at the reference pressure p R = 6 bar.
NOTE No leakage means no visible weeping or drop formation from the body of the nozzle.
5 Testing and verification
All tests shall be done with water only.
Unless otherwise specified, tests shall be carried out at the reference pressure p R , in the following order.
NOTE Guidance for acceptance tests on delivery is given in Annex A.
5.2 Jet spray angle measurement
Arrange the water nozzle on a fixed support in a horizontal position 1 ,5 m above the ground, in a zone where the wind speed is lower than 2 m/s.
Arrange a rule perpendicular to the flow at a distance of 1 m. This rule shall be marked in order to determine the spray angle.
5.3 Heat and frost test
5.3.1 Sensitivity to heat
It shall be possible to use the water nozzle without restricting its function after it has been stored for 24 h at (55 ± 2) °C.
NOTE Hand protection should be used when carrying out this test.
5.3.2 Sensitivity to frost
The water nozzle shall be disconnected following operation for 1 min at the reference pressure p R . It shall then be drained for 1 min and stored at a temperature of (- 1 5 ± 2) °C for 30 min. Following this, it shall still be possible to move the operating elements manually.
NOTE Hand protection is recommended.
The combination nozzle shall be held in the vertical position, discharge end down.
The steel ball shall pass through the nozzle.
5.5 Flow and throw test
The effective throw shall be measured under the following conditions, in accordance with Figure 2:
effective throw (in metre): furthest droplets – 1 0 % = d eff = 0,9 d max ;
pressure at the inlet of the nozzle: p R = 6 bar;
inclination: (30 ± 0,5)°;
height: the outlet of the nozzle shall be no more than 1 m from the ground;
maximum wind speed: 2 m/s (Beaufort scale 3).