1.1   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
Fire hose reels (with semi -rigid hose)  BOTSWANA  STANDARD  BOS 5:2019 
Edition  3.0 BOS 5:2019 
BOTSWANA BUREAU OF STANDARDS   
   
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Copyright Protection Notice  
 
© BOBS [2019] – All rights reserved  
This Botswana standard is copyright -protected by BOBS. Unless otherwise specified, no part of this pub lication 
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including 
photocopying, or posting on the Internet or an Intranet, without prior written permission. Requests for 
permission to reproduce should be addr essed to BOBS at the address below.  
Botswana Bureau of Standards  
Private Bag BO 48  
Gaborone, Botswana   
Telephone:  +267 3903200  
Fax: +267 3903120  
E-mail:  infoc@hq.bobstandards.bw  
Website:  www.bobstandards.bw  
 
ICS 13.220.10  
Published in Botswan a
BOS 5:2019 
Third Edition  
i 
 Contents  
 
Foreword  ................................ ................................ ................................ ................................ .................. ii 
1 Scope  ................................ ................................ ................................ ................................ ........... 1 
2 Normative references  ................................ ................................ ................................ ................. 1 
3 Definitions  ................................ ................................ ................................ ................................ ...1 
4 Requirements  ................................ ................................ ................................ .............................. 2 
5 Marking and instructions  ................................ ................................ ................................ ........... 6 
6 Inspec tion and methods of test  ................................ ................................ ................................ 7 
 
 
  BOS 5:2019 
Third Edition  
ii 
 Foreword  
This Botswana standard was approved by the Technical Advisory Committee of the Standards Council on 
2019 -12-17. 
The Botswana Bureau of Standards (BOBS) was established under the Standa rds Act No. 16 of 1995 with a 
primary responsibility of preparing Botswana standards.  
During the preparation of this standard assistance was derived from a South  African standard, 
SANS  543:2015 , Fire hose reels (with semi -rigid hose) , published by the Sout h African Bureau of Standards.  
This Botswana Standard is a revision of, cancels and replaces BOS 5:2009.  
During the review of this standard, the following organizations were directly represented in the Technical 
Committee, MED 6 – Fire Safety:  
Fire Departm ent    Mr D Sebeso   (Chairperson)  
Botswana Bureau of Standards    Mr KJ Lekaunyane  (Technical Secretary)  
Botswana Bureau of Standards    Mr O Kealotswe  
Fire Boys      Mr B Mogale  
Fire Boys      Mr K Bapene  
Fire Suppression     Mr T Taziveyi  
Multitech Consultant s    Mr D Mutasa  
SELF       Mr E Muzenda  
SELF       Mr Z Moseki  
 
 
 
 
 
 
 
 
 
 
 
 
© BOBS [201 9] – All rights reservedBOS 5:2019 
Edition  3.0 
1 Fire hose reels (with semi -rigid hose)  
1 Scope  
This standard specifies requirements for the construction and performance of fire hose reel systems with semi -
rigid hoses for installation in buildings and other construction works, permanently connected to a water supply.  
2 Normative references  
The following referenced documents are indispensable for the application of this document. For dated 
references,  only the edition cited applies. For undated references, the latest edition of the referenced document 
(including any amendments) applies. Botswana Bureau of Standards (BOBS) maintains registers of currently 
valid documents.  
BOS 6 -1, Symbolic safety signs – Part 1: Standard signs and general requirements  
BOS 65 -2, The production of reconditioned fire -fighting equipment – Part 2: Fire hose reels, hydrants and 
booster connections  
EN 694, Fire-fighting hoses – Semi -rigid hoses for fixed systems  
ISO 4892 -2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon -arc sources  
ISO 9227 Corrosion tests in artificial atmospheres  – Salt spray tests  
3 Definitions  
For the purpose of this standard, the following definitions apply:  
3.1 automatic fire hose  reel:  fire-fighting appliance consisting of a reel with water supplied through the 
centre, automatic inlet stop valve, semi -rigid hose, shut -off nozzle and connectors or couplings  
3.2 manual fire hose reel: fire-fighting appliance consisting of a reel wit h water supplied through the 
centre, manual inlet stop valve adjacent to the reel, semi -rigid hose, shut -off nozzle and, where required, a 
hose guide  
3.3 fixed fire hose reel: hose reel capable only of rotating in one plane with a hose guide adjacent to th e 
reel 
3.4 reel and valve subassembly: that part of a fire hose reel assembly consisting of a reel, automatic 
inlet stop valve (if fitted) and the connection to the reel, but excluding semi -rigid hose, shut -off nozzle and 
connectors or couplings  
3.5 shut -off nozzle: component, at the end of the hose, used to direct and control the discharge of water  
3.6 swinging fire hose reel: hose reel capable of rotating and swinging in more than one plane and 
mounted on one of the following:  
a) swinging arm; or  
b) swinging pi pe; or  
c) swinging door  
 BOS 5:2019 
Edition  3.0 
2 4 Requirements  
4.1 Components  
4.1.1  Reel  
4.1.1.1  The reel shall rotate around a spindle /water way . 
4.1.1.2  The reel shall consist of two wheels with a maximum diameter of not more than 800 mm, and 
inside segments or drum with a minimum diameter of not less than 200 mm for 19 mm and 25 mm hoses and 
a minimum diameter of not less than 280 mm for a 33 mm hose.  
4.1.1.3  When tested in accordance with 6.2, the hose reel shall show no visible signs of leakage.  
4.1.1.4  When tested in accordance with 6.3, the swinging hose reels shall be able to swing to a minimum 
of 170° and show no visible signs of leakage and damage . 
4.1.1.5  When tested in accordance with 6.4, the forces to unwind the hose in any horizontal direction shall 
not exceed the approp riate values given in Table 1.  
Table  1 — Forces to unwind the hose  
Hose diameter  
mm Maximum initial force 
without hose guide  
N Maximum initial force 
at any point with hose 
guide  
N Maxi mum force at any 
point to pull out the 
entire hose  
N 
19 70 150 250 
25 70 200 300 
33 100 300 350 
 
4.1.1.6  When tested in accordance with 6.5, the rotation of the reel shall stop within one turn.  
4.1.1.7  When tested in accordance with 6.6, no deformation  which may harm the function of the reel, or 
of the hose fittings at the reel inlet and outlet shall occur.  
4.1.2  Hose  
4.1.2.1  General  
The hose shall be semi -rigid complying with the provisions of EN 694.  
4.1.2.2  Hose bore  
The nominal bore of the hose shal l be 19 mm, 25 mm, or 33 mm.  
4.1.2.3  Maximum length  
The length of the hose shall be in one piece and shall be not less than 28 m and not exceed 30 m.  
4.1.3  Shut -off nozzle  
4.1.3.1  General  
The hose shall terminate in a shut -off nozzle, which shall give the following control settings:  BOS 5:2019 
Edition  3.0 
3 a) shut;  
b) spray; and/or  
c) jet. 
NOTE  When both spray and jet are provided, it is recommended that the sequence should be as above with spray 
setting between the shut setting and the jet setting.  
Any spray discharge shall be in the form  of either a sheet spray or a conical spray.  
4.1.3.2  Resistance to impact  
When tested in accordance with 6.7, the nozzle shall not break or show any visible leakage.  
4.1.3.3  Operating torque  
When tested in accordance with 6.8, the torque necessary to opera te the nozzle to each control setting at 
maximum working pressure shall not exceed the appropriate values given in Table 2.  
Table  2 — Maximum operating torque of nozzle  
Control setting  Maximum operating torque  
Nm 
19 mm and 25 mm hoses  33 mm hose  
Operating  4 7 
Spray  4 7 
Jet 4 7 
Flow rate control  4 7 
 
4.1.3.4  Marking of control conditions  
4.1.3.4.1  Rotary operated nozzles shall be marked to show the direction of closing and opening . 
4.1.3.4.2  Lever operated nozzles shall be marked to show the settings for  
a) shut,  
b) spray, and/or  
c) jet. 
4.1.4  Inlet stop valve  
4.1.4.1  General  
All hose reels shall be fitted with an inlet stop valve.  
4.1.4.2  Manual inlet stop valve  
4.1.4.2.1  The valve shall b e closed by turning the handle or handwheel in a clockwise direction.  
4.1.4.2.2  The direction of opening (see 4.1.4.2.1) shall be marked.  BOS 5:2019 
Edition  3.0 
4 4.1.4.2.3  Screwdown  valves shall be fully open after maximum 3.5 turns of the handwheel.  
NOTE 1  It is recommended that  an interlocking device be fitted so that the nozzle cannot be withdrawn unless the water 
supply is first turned on by opening of the manual stop valve.  
NOTE 2  The valve can be of a screw down type or quick -opening type. In selecting the type of stop valve  to be used, 
the effect of water hammer should be considered.  
4.1.4.3  Automatic inlet stop valve  
An automatic inlet stop valve shall be fully opened by not more than 3 complete revolutions of the reel. When 
tested in accordance with 6.2, no visible leakage  shall occur.  
NOTE  To assist ease of maintenance for hose reels fitted with automatic valves, consideration should be given to 
water supply isolation valves.  
4.1.5  Cabinets  
4.1.5.1  General  
4.1.5.1.1  Cabinets shall be fitted with a door and may be fitted wi th a lock.  
4.1.5.1.2  Cabinet doors shall open to a minimum of 170° to allow the hose to be run out freely in any 
direction.  
4.1.5.1.3  Lockable cabinets shall be provided with an emergency opening device, which should be provided 
only with transparent frang ible material. To provide access to inspection and maintenance, the cabinet shall 
be unlockable with a key.  
4.1.5.1.4  If the emergency opening device is protected by a frangible glass front, it shall be of a type that 
when broken, does not leave jagged or sharp edges, which might cause injury when the emergency opening 
is operated.  
4.1.5.1.5  Cabinets shall be free of sharp edges, which might damage the equipment or cause injury.  
4.1.5.1.6  Cabinets may also be used to contain other firefighting equipment, pr ovided that the cabinet is of 
sufficient size and equipment does not interfere with the prompt use of the hose reel.  
NOTE  For service in some climatic conditions, it could be necessary to provide the cabinet with suitable ventilating 
openings.  
4.2 Material s 
4.2.1  Resistance to external corrosion  
4.2.1.1  When coated metal parts are tested in accordance with 6.9, not more than 2 mm of each side of 
the groove formed by the cross shall be detached.  
4.2.1.2  When uncoated metal parts are tested in accordance with  6.10, the mechanical properties of all 
working parts shall remain unimpaired and there shall be no significant corrosion defects inside or outside.  
NOTE  Significant corrosion defects are pits, cracks and blisters.  
4.2.2  Plastics materials  
4.2.2.1  Componen ts subjected to pressure  
4.2.2.1.1  When tested in accordance with 6.11, the components shall show no signs of cracking or crazing.  
4.2.2.1.2  After being subjected to the ageing test in accordance with 6.11  BOS 5:2019 
Edition  3.0 
5 a) the components shall, when tested in accordance wi th 6.12, show no leakage at maximum working 
pressure,  
b) the centre parts shall, when tested in accordance with 6.6, meet the requirements of 4.1.1.7, and  
c) the nozzles shall, when tested in accordance with 6.7, meet the requirements of 4.1.3.2.  
4.2.2.2  Compone nts not subjected to pressure  
After being subjected to the aging test in accordance with 6.11, all components, excluding any marking plates, 
shall meet the requirements of 4.1.1.7, when tested in accordance with 6.6.  
4.2.3  Resistance to corrosion of waterw ays 
When tested in accordance with 6.13, there shall be no significant corrosion (pits, cracks and blisters) defects 
and the mechanical operation of all working parts shall be unimpaired.  
4.3 Hydraulic properties  
4.3.1  Resistance to internal pressure  
When tested in accordance with 6.12 at the appropriate test pressure given in Table 3, hose reels shall show 
no leakage.  
4.3.2  Strength  
When tested in accordance with 6.14, hose reels shall not burst at less than the appropriate burst pressure 
given in Table 3.  
Table  3 — Working, test and minimum burst pressure for hose reels  
Nominal inside 
diameter  of hose   
mm Working pressure   
MPa Test pressure   
MPa Minimum burst 
pressure   
MPa 
19 1.2 1.8 3.0 
25 1.2 1.8 3.0 
33 0.7 1.05 1.75 
 
4.3.3  Minimum flow rate  
When determined in accordance with 6.15, the flow rates in jet and spray settings shall be not less than the 
appropriate values given in Table 4.  
 
 
 
 
 
 BOS 5:2019 
Edition  3.0 
6  
Table  4 — Minimum flow rates and minimum k -coefficient according to pressure  
Nozzle inside 
diameter or 
equivalent 
diameter  
mm Minimum flow rate (Q)  
L/min   
k-coefficient  
P = 0.2 MPa  P = 0.4 MPa  P = 0.6 MPa  
4 12 18 22 9 
5 18 26 31 13 
6 24 34 41 17 
7 31 44 53 22 
8 39 56 68 28 
9 46 66 80 33 
10 59 84 102 42 
12 90 128 156 64 
NOTE  Flow rate ( Q) at a pressure ( P) is related to the equation Q = K 10 P, where Q is in L/min and P is 
in megapascals.  
 
4.3.4  Effective throw  range  
When determined in accordance with 6.16, the effective throw range of the discharge at a pressure of 0.2 MPa 
shall not be less than  
a) 10 m for jet discharge,  
b) 6 m for sheet spray discharge, and  
c) 3 m for conical spray discharge.  
4.3.5  Spray discharge ang le 
When determined in accordance with 6.17, nozzles with a spray setting shall give a spray angle of  
a) 90° ± 5° for sheet spray, and  
b) not less than 45° for conical spray.  
5 Marking and instructions  
5.1 Colour  
The colour of the reel wheels shall be red.  
5.2 Identification symbol  
The hose reel and the hose reel cabinet shall be marked in accordance with BOS 6 -1. BOS 5:2019 
Edition  3.0 
7 NOTE  The symbol can have a luminescent surface.  
5.3 Marking  
The reel shall be marked with the following information:  
a) supplier’s name or trade mark, or bot h; 
b) year of manufacture;  
c) maximum working pressure;  
d) length and bore of the hose; and  
e) nozzle equivalent diameter (marked on the nozzle).  
5.4 Instructions for use  
Fire hose reel assemblies shall be provided with full operational instructions for display on or adjacent to the 
hose reel.  
5.5 Installation and maintenance instructions  
The supplier shall make available an installation manual specific for the hose reel. Maintenance procedures 
shall be as specified in BOS 65 -2. 
6 Inspection and methods of test  
6.1 Inspe ction  
Visually examine the hose reel for compliance with the appropriate requirements of this standard, for which 
tests to assess compliance are not given in 6.2 to 6.17.  
6.2 Test for rotation  
6.2.1  Apparatus  
6.2.1.1  Support, fixed at 1.5 m above the concr ete floor.  
6.2.1.2  Pressure gauge, calibrated.  
6.2.1.3  Water supply.  
6.2.2  Procedure  
6.2.2.1  Mount the hose reel fitted with the maximum length of hose (coiled on the reel) on the support in 
the room with an ambient temperature of 20 °C ± 5 °C.  
6.2.2.2  Fill the reel completely with water and pressurize it to the maximum working pressure given in 
Table 3.  
6.2.2.3  Rotate the reel at a rate of 30 r/min for 3 000 rotations.  
6.2.2.4  For hose reels fitted with automatic valves, change the direction of rotation (c lockwise/ 
anticlockwise) every 25 rotations.  
6.2.2.5  Check for compliance with 4.1.1.3 and 4.1.4.3.  
6.3 Test for swinging hose reels  BOS 5:2019 
Edition  3.0 
8 6.3.1  Apparatus, as given in 6.2.1.  
6.3.2  Procedure  
6.3.2.1  Mount the hose reel fitted with the maximum length of hose (coi led on the reel) on the support in 
the room with an ambient temperature of 20 °C ± 5 °C.  
6.3.2.2  Fill the reel completely with water and pressurize it to the maximum working pressure given in 
Table 3.  
6.3.2.4  Swing the hose reel 1 000 times from 0° (the st ored position) to the hose reel’s maximum swing 
at a nominal rate of 1 swing per 4 s.  
6.3.2.5  Check for compliance with 4.1.1.4.  
6.4 Test for unwinding load  
6.4.1  Apparatus as given in 6.2.1 and a dynamometer.  
6.4.2  Procedure  
6.4.2.1  Mount the hose reel fi tted with the maximum length of hose (coiled on the reel) on the support in 
the room with an ambient temperature of 20 °C ± 5 °C.  
6.4.2.2  Fill the reel completely with water and pressurize it to the maximum working pressure given in 
Table 3.  
6.4.2.3  For ho se reels capable of rotating only in one plane, fit the hose guide according to the 
manufacturer’s instructions.  
6.4.2.4  With the use of a dynamometer, measure  
f) the force to start rotation on the reel,  
g) the maximum force to start rotation of the reel when pu lling the hose horizontally through a hose guide, 
and 
h) the maximum force to pull out the entire hose on a concrete floor.  
6.4.2.5  Check for compliance with 4.1.1.5.  
6.5 Test for dynamic braking  
6.5.1  Apparatus as given in 6.2.1.  
6.5.2  Procedure  
6.5.2.1  Unwi nd approximately 5 m of the hose at a rate of approximately 1 m/s.  
6.5.2.2  Stop the unwinding and check for compliance with 4.1.1.6.  
6.6 Test for resistance to impact and load  
6.6.1  Apparatus  
6.6.1.1  Steel bridge, of 100 mm × 25 mm.  
6.6.1.2  Cylindrical ham mer, with flat faces approximately 125 mm diameter and with a mass of   
25 kg ±0.1 kg.  BOS 5:2019 
Edition  3.0 
9 6.6.2  Procedure  
6.6.2.1  Rest the steel bridge centrally across the two-reel wheels and vertically above the centreline  of 
the spindle.  
6.6.2.2  Mount a steel cylindrical h ammer in guides above the steel bridge so that it falls freely from a 
height of 300 mm ± 5 mm to strike the steel bridge mid -span between the two plates.  
NOTE  See Figure 1 for test arrangement.  
  
 
Figure 1—Test Arrangement  
 
 
 
6.6.2.3 Check for compliance with 4.1.1.7.  
6.6.2.4  Unwind the hose completely.  
6.6.2.5  Apply a mass of 75 kg ± 0.1 kg at 500 mm from the hose outlet (see Figure 2) for 5 min.  
6.6.2.6  Check for compliance with 4.2.2.1.2(b).  
 
 
 
 
BOS 5:2019 
Edition  3.0 
10  
 
Dimensions in millimetres  
 
Figure 2 — Test arrangement for load test  
 
6.7 Test for resistance of the nozzle to impact  
6.7.1  Apparatus  
Hose reel, fully assembled.  
6.7.2  Procedure  
6.7.2.1  Fill the hose with water and pressurize to the maximum wo rking pressure (see Table 3).  
6.7.2.2  Unwind the hose so that it touches the concrete floor as shown in Figure 3.  
6.7.2.3  Hold the nozzle in the closed position at 1.5 m ± 0.05 m and allow it to drop freely 5 times without 
any initial force.  
6.7.2.4  Check for compliance with 4.1.3.2 and 4.2.2.1.2(c).  
 
 
 
 
 BOS 5:2019 
Edition  3.0 
11  
 
 
Dimensions in millimetres  
 
 
Figure 3 — Arrangement for impact test  
6.8 Test for the operating torque  
6.8.1  Apparatus  
As in 6.7.  
6.8.2  Procedure  
6.8.2.1  Secure the nozzle (same  nozzle used in 6.7) to a fixed support without interfering with its 
operation.  
6.8.2.2  Measure the operating torque at the maximum working pressure.  
6.8.2.3  Check for compliance with 4.1.3.3.  
6.9 Test for resistance of coated metal parts to external corro sion 
6.9.1  Apparatus  
6.9.1.1  Test piece, of nominal size 150 mm × 100 mm with the same thickness as the material of which 
the product is made and with the protective coating of thickness not less than 0.8 times and not more than the 
thickness used in the p roduct.  
6.9.1.2  Steel scriber.  
BOS 5:2019 
Edition  3.0 
12 6.9.1.3  Salt spray chamber.  
6.9.2  Procedure  
6.9.2.1  Mark a cross on the test piece (see Figure 4) through the protective coating until the underlying 
material appears.  
6.9.2.2  Place the test piece in a 5 % salt spray chamber for 240 h ± 8 h as specified in ISO 9227.  
6.9.2.3  Check for compliance with 4.2.1.1.  
 
Dimensions in millimetres  
 
Figure 4 — Corrosion test piece  
6.10 Test for resistance of uncoated metal parts to external corrosion  
6.10.1  Apparatus  
6.10.1.1 Hose reel.  
6.10.1.2  Salt spray chamber.  
6.10.2  Procedure  
6.10.2.1  Place the hose reel (without the hose), in a 5 % salt spray chamber for 240 h ± 8 h as specified in 
ISO 9227.  
6.10.2.2  Check for compliance with 4.2.1.2.  
6.11 Ageing test for plastics m aterials  
6.11.1  Apparatus  
As given in ISO 4892 -2. 
6.11.2  Procedure  BOS 5:2019 
Edition  3.0 
13 6.11.2.1  Expose the plastics materials to ultraviolet light and water spray according to ISO 4892 -2, under 
the following conditions:  
i) 65 °C ± 3 °C black panel temperature;  
j) 50 % ± 5 % relativ e humidity;  
k) spray cycle of 102 min dry interval and 18 min water spraying; and  
l) total dose of exposure 2 GJ/m2 (1 000 h at 550 W/m2).  
6.11.2.2  Visually examine the materials for compliance with 4.2.2.1.1.  
6.12 Test for resistance to internal pressure  
6.12.1  Apparatus  
Hose reel.  
6.12.2  Procedure  
6.12.2.1  Set up the hose reel as shown in Figure 1.  
6.12.2.2  Release the internal pressure.  
6.12.2.3  Raise the pressure, over a period of ± 60 s, to the test pressure given in Table 3.  
6.12.2.4  Hold the pressure for 3 05 s ± 5 s.  
6.12.2.5  Release the pressure, over a period of ±10 s.  
6.12.2.6  Carry out the cycle 2 more times.  
6.12.2.7  Check for compliance with 4.2.2.1.2(a) and 4.3.1.   
6.13 Test for resistance to corrosion of waterways  
6.13.1  Apparatus  
Complete or partia lly assembled hose reel, comprising the complete waterways.  
6.13.2  Procedure  
6.13.2.1  Fully fill the waterways from the inlet stop valve to the nozzle with a solution of sodium chloride 
(mass fraction of 1 %) in demineralized water.  
6.13.2.2  Store for 3 mo nths ± 5 d at a temperature of 20 °C ± 5 °C.  
6.13.2.3  Check for compliance with 4.2.3.  
6.14 Test for strength of reel  
6.14.1  Apparatus  
Hose reel.  
6.14.2  Procedure  
6.14.2.1  Remove the hose and the nozzle from the reel and blank off the reel outlet.  BOS 5:2019 
Edition  3.0 
14 6.14.2.2  Pressurize the reel hydraulically to the appropriate minimum burst pressure given in Table 3 and 
hold the pressure for 65 s ± 5 s.  
6.14.2.3  Check for compliance with 4.3.2.  
6.15 Measurement of flow rate  
6.15.1  Apparatus  
6.15.1.1  Hose reel, fitted with the  hose.  
6.15.1.2  Water supply.  
6.15.2  Procedure  
6.15.2.1  Install the hose in accordance with the supplier’s instructions.  
6.15.2.2  Coil the filled hose on the reel ensuring that the stop valve, or where applicable automatic valve, 
is fully open leaving 1 m ± 0.1 m of hose unwound.  
6.15.2.3  Measure and record the flow rate, Q, in spray and/or jet settings, as appropriate, at  
 0.6 MPa ± 0.025 MPa.  
6.15.2.4  Check for compliance with 4.3.3.  
6.16 Measurement of throw range  
6.16.1  Apparatus  
As in 6.15.  
6.16.2  Proc edure    
6.16.2.1  Mount the nozzle to a support tilted at 30° to the ground with the discharge outlet at 0.6 m ± 0.01 
m above the ground.  
6.16.2.2  Adjust the inlet pressure to 0.2 MPa ± 0.025 MPa at the inlet valve.  
6.16.2.3  With the nozzle in the appropria te (jet or spray) position, measure the effective throw of water.  
6.16.2.4  Test nozzles with conical spray angle at the minimum spray angle. Measure the effective range 
as 0.9 times the maximum range.  
6.16.2.5  Check for compliance with 4.3.4.  
6.17 Measurem ent of spray angle  
6.17.1  Apparatus  
As in 6.15.  
6.17.2  Procedure  
6.17.2.1  Mount the nozzle horizontally to a fixed support at 1.5 m ± 0.05 m above the ground in a draught -
free zone (wind speed less than 2 m/s) and 0.5 m ± 0.005 m from a vertical plate suit ably marked as shown in 
Figure 5.  
6.17.2.2  Connect the water supply and adjust the incoming pressure to 0.6 MPa ± 0.025 MPa.  BOS 5:2019 
Edition  3.0 
15 6.17.2.3  Adjust the nozzle to spray position and start the water discharge. Check that the discharge is as 
follows:  
m) for nozzles wit h a conical spray pattern, symmetrical about the A -A axis covering not less than the D -D 
zone all around the A -A axis; or  
n) for nozzles with sheet spray pattern covering not more than the B -B zone and not less than the C -C zone 
on each side of the A -A axis.  
6.17.2.4  Check for compliance with 4.3.5.  
 
Dimensions in millimetres  
 
 
Figure 5 —Test arrangement for measurement of spray