GB 5135.3-2003 English PDF (GB5135.3-2003)

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GB 5135.3-2003: Automatic sprinkler system -- Part 3: Water mist nozzles
GB 5135.3-2003
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.220.30
C 83
Automatic sprinkler system -
Part 3. Water mist nozzles
自动喷水灭火系统
ISSUED ON. OCTOBER 08, 2003
IMPLEMENTED ON. MAY 01, 2004
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China
Table of Contents
Foreword ... 4 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 6 
4 Classification and specification-models ... 7 
4.1 Classification ... 7 
4.2 Specification-models ... 8 
5 Requirements ... 8 
5.1 Appearance, marking and nozzle screw thread ... 8 
5.2 Flow coefficient ... 8 
5.3 Spray angle ... 9 
5.4 Water distribution ... 9 
5.5 Mist-drop diameter ... 9 
5.6 Spraying ... 9 
5.7 Nozzle strength ... 9 
5.8 Ammonia stress corrosion resistance ... 9 
5.9 Sulfur dioxide corrosion resistance ... 10 
5.10 Salt-spray corrosion resistance ... 10 
5.11 Low temperature resistance ... 10 
5.12 High temperature resistance ... 10 
5.13 Vibration resistance ... 10 
5.14 Mechanical impact resistance ... 10 
5.15 Close-type water mist nozzle ... 10 
6 Test methods ... 11 
6.1 Appearance inspection ... 11 
6.2 Flow coefficient measurement ... 11 
6.3 Spray angle measurement ... 12 
6.4 Water distribution test ... 13 
6.5 Mist-drop diameter measurement ... 15 
6.6 Spray test ... 15 
6.7 Nozzle strength test ... 16 
6.8 Ammonia stress corrosion test ... 16 
6.9 Sulfur dioxide corrosion test ... 16 
6.10 Salt-spray corrosion test ... 17 
6.11 Low temperature test ... 17 
6.12 High temperature test ... 17 
6.13 Vibration test ... 17 
6.14 Mechanical impact test ... 18 
6.15 Close-type water mist nozzle test ... 18 
7 Inspection rules ... 18 
7.1 Inspection classification ... 18 
7.2 Batch grouping ... 20 
7.3 Sampling ... 20 
7.4 Judgment criteria ... 20 
8 Packaging, transportation and storage ... 22 
Annex A ... 23 
Figure 1 Test Device for Flow Characteristics ... 12 
Figure 2 Spray angle measurement device ... 13 
Figure 3 Arrangement of Water Spray Test Pipe Network ... 14 
Figure 4 Arrangement of Water Distribution Test ... 15 
Figure 5 Test procedure of open-type water mist nozzle and the
quantity of samples ... 21 
Figure 6 Test procedure of closed-type water mist nozzle and the
quantity of samples ... 22 
Figure A.1 Vertical Spray Diagram and Horizontal Spray Diagram ... 23 
Foreword 
The contents in chapter 5 and chapter 7 are mandatory; and other contents are
recommended.
GB 5135 Automatic sprinkler systems is divided into 15 parts.
— Part 1. Sprinkler;
— Part 2. Wet system alarm valves, retard chamber, water motor alarm;
— Part 3. Water mist nozzles;
— Part 4. Dry pipe valves;
— Part 5. Deluge alarm valves;
— Part 6. Convention valves;
— Part 7. Water flow indicator;
— Part 8. Accelerator;
— Part 9. Early suppression fast response (ESFR) automatic sprinklers;
— Part 10. Pressure switch;
— Part 11. Grooved couplings and fittings;
— Part 12. Extended coverage sprinkler;
— Part 13. Performance requirements and test methods of drencher nozzle;
— Part 14. Preaction devices;
— Part 15. Domestic sprinklers;
...
This is part 3 of GB 5135.
This part is formulated on the basis of GA 33-1992 “Automatic Sprinkler System –
Performance Requirements and Test Methods of Water Mist Nozzle”. The differences in
the contents, compared with GA 33-1992, are as follows.
— Adjust the contents on water mist nozzle models (3.5 of 1992 edition; 4.2 of this
edition);
Automatic Sprinkler System –
Part 3. Water Mist Nozzle
1    Scope 
This part of GB 5135 specifies the requirements, test methods, inspection rules, marking,
packaging, transportation and storage of the water mist nozzles of automatic sprinkler
system.
This part of GB 5135 shall be applicable to the water mist nozzles of automatic sprinkler
system.
2    Normative references 
The articles contained in the following documents have become part of this document
when they are quoted herein. For the dated documents so quoted, all subsequent
modifications (including all corrections) or revisions made thereafter do not apply to this
standard. However, the parties who reach an agreement according to this standard are
encouraged to study whether the latest versions of these documents may be used. For the
undated documents so quoted, the latest versions (including all modification sheets) apply
to this document.
GB /T 7306 (All parts) Pipe threads with 55 degree thread angle where pressure
GB 5135.1-2003 Automatic sprinkler system - Part 1. Sprinkler
3    Terms and definitions 
For the purpose of this standard, the following terms and definitions apply to this part of
GB 5135.
3.1
water mist nozzle
It refers to the nozzle where the water flow is broke up into water drop at the diameter less
than 1mm under pressure in the setup area and sprayed out in the designed form.
3.2
spray angle
It refers to the vertex angle of the cone which makes the water mist sprayed out of water
mist nozzle extended by surrounding the axis of nozzle.
3.3
centrifugal spray
It refers to the mist sprayed out under the effect of centrifugal force from the rotatory water
flow that moves along the internal wall and that is broke down after the pressured water
flows through the nozzle.
3.4
impact spray
It refers to the mist formed from that the pressured water flow is broken up by impacting
with splash box.
3.5
effective range
It refers to the horizontal distance BETWEEN the highest point where water mist reaches
when the nozzle sprays horizontally AND the plane where the nozzle is located vertical to
the axis of nozzle.
3.6
spray height
It refers to the vertical distance BETWEEN the highest point where water mist reaches
when the nozzle sprays horizontally AND the axis of nozzle.
3.7
drop diameter Dv0.90
The drops of which such diameter or below accounting for the total volume of sprayed
water is 90%.
4    Classification and specification‐models 
4.1 Classification
4.1.1 A-type water mist nozzle
The centrifugal spray nozzle whose water inlet and water outlet are formed into a certain
angle.
5.9 Sulfur dioxide corrosion resistance
5.9.1 Each part of water mist nozzle which has undergone the test in accordance with 6.9
shall be free of obvious corrosion marks.
5.9.2 The flow of the water mist nozzle, which has undergone the test above, measured
under the rated working pressure shall not be ±5% differing from the flow value measured
before corrosion test.
5.10 Salt-spray corrosion resistance
5.10.1 Each part of water mist nozzle which has undergone the test in accordance with
6.1 shall be free of obvious corrosion marks.
5.10.2 The flow of water mist nozzle, which has undergone the test above, measured
under the rated working pressure shall not be ±5% differing from the flow value measured
before corrosion test.
5.11 Low temperature resistance
The open-type water mist nozzle which has undergone the test in accordance with 6.11
shall not have cracked or detached coating or plating. The close-type water mist nozzle
shall comply with 6.17 of GB 5135.1-2003.
5.12 High temperature resistance
The water mist nozzle which has undergone the test in accordance with 6.12 shall be fre...