Automatic Sprinkler System — Part 13: Performance requirements and test methods of drencher nozzle
1 Scope
This part of GB 5135 specifies the requirements, test methods, inspection rules, as well as marking, packaging, transport, storage of drencher nozzles of automatic sprinkler system.
This part is applicable to drencher nozzles of automatic sprinkler system.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB 5135. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this part. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads--Part 1: Parallel internal and taper external threads (GB/T 7306.1-2000, eqv ISO 7-1:1994)
GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads--Part 2: Taper internal and external threads (GB/T 7306.2-2000, eqv ISO 7-1:1994)
3 Terms and definitions
For the purposes of this part of GB 5135, the following terms and definitions apply.
3.1
drencher nozzle
a spray apparatus fixed onto a drencher pipe system, which can spray water continuously to form a curtain to protect the surface under a fire threat as a fire separation
3.2
spray angle
the vertex angle of the fan-shaped water curtain which takes the nozzle head as the vertex when a nozzle sprays
3.3
deflection angle
the angle between inlet axis and outlet axis of a nozzle when it sprays
3.4
maximal cover width
the maximum width of an extended water curtain under the working pressure
4 Classification
4.1 Classification by structure form
4.1.1 Slit drencher nozzle
4.1.1.1 Single-slit drencher nozzle
A drencher nozzle with a single slit on its body, through which water sprays in designed shape.
4.1.1.2 Double-slit drencher nozzle
A drencher nozzle with two slits on its body, through which water sprays in designed shape.
4.1.2 Impulse drencher nozzle
4.1.2.1 Deflector impulse drencher nozzle
A drencher nozzle through which water flows out to impulse the outer guide deflector and sprays in designed shape.
4.1.2.2 Surface impulse drencher nozzle
A drencher nozzle through which the water flows out to impulse the outer guide surface and sprays in designed shape.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
4.1 Classification by structure form
4.2 Classification according to usage
5 Model designation
6 Requirements
6.1 Appearance and marking
6.2 Flow coefficient
6.3 Spray angle and deflection angle
6.4 Spray shape
6.5 Water uniformity
6.6 Radiant heat blocking capacity
6.7 Ammonia stress corrosion
6.8 Moist sulfur-dioxide corrosion
6.9 Salt-spray corrosion
6.10 Resistance to low temperatures
6.11 Resistance to heat
7 Test methods
7.1 Appearance inspection
7.2 Flow coefficient measurement
7.3 Measurement of spray angle and deflection angle
7.4 Spray test
7.5 Water uniformity test
7.6 Radiant heat blocking test
7.7 Ammonia stress corrosion test
7.8 Sulfur-dioxide corrosion test
7.9 Salt-mist corrosion test
7.10 Low-temperature test
7.11 High-temperature test
8 Inspection rules
8.1 Inspection classification
8.2 Batch
8.3 Sampling
8.4 Judgment rules
9 Package, transportation and storage
Annex A (Informative) Downward spray diagram and lateral spray diagram
