GB 5135.1-2003 Automatic sprinkler fire extinguishing system Part 1: Sprinkler heads
Some standard content:
ICS 13.220. 30
National Standard of the People's Republic of China
GB5135.1—2003
Replaces GB5135—1993
Automatic sprinkler system--Part 1: Drinking water nozzle
Automatic sprinkler system--Part 1 :Sprinkler2003-10-08 Issued
People's Republic of China
General Administration of Quality Supervision, Inspection and Quarantine
2004-05-01 Implementation
Chapters 4, 5, 6 and 8 of this part are mandatory, and the rest are recommended. GB5135 "Automatic Sprinkler Fire-Extinguishing System" is divided into fifteen parts from the beginning: Part 1: Drinking Water Sprinkler;
Part 2: Wet Alarm Valve;
Part 3: Water Mist Sprinkler;
Part 4: Thousand Alarm Valve;
Part 5: Rain Sprinkler Shower alarm valve;
Part 6 General valves;
--Part 7: Water flow indicators;
Part 8: Accelerators;
Part 9: Early suppression fast response (ESFR) nozzles; Part 10: Pressure switches;
Part 11: Grooved pipe fittings and assemblies;-Part 12: Expanded coverage area wine nozzles, Part 13: Water curtain nozzles;
Part 14: Pre-action devices;
Part 15: Household nozzles;
This part is Part 1 of GB5135.
GB 5135.1-—2003
This revision mainly refers to ISO/DIS6182.1 "Requirements and test methods for sprinkler heads for automatic sprinkler fire-fighting systems" (1998 English version), UL199 "Sprinkler heads for fire protection" (1997 English version), FM2000 "Sprinkler heads for fire protection" (1998 English version) and other standards.
This part replaces GB5135-1993 "Technical requirements and test methods for sprinkler heads of automatic sprinkler fire extinguishing systems". Compared with GB5135--1993, the main changes are as follows: - The classification and naming methods of products have been revised; - Dynamic thermal performance requirements and corresponding test methods have been added (6.19 and 7.18); - Side spray requirements and corresponding test methods have been added (6.26 and 7.25); - The protection angle requirements and corresponding measurement methods of water shields have been added (6.27 and 7.26); - The requirements and corresponding test methods of flush, embedded and concealed sprinkler heads have been added (6.30 and 7.29); - The requirements for product instructions have been added (9.2). This part replaces GB5135-1993 from the date of implementation. Appendix A of this part is a normative appendix, and Appendix B, Appendix C, Appendix D and Appendix E are informative appendices. This part is proposed by the Ministry of Public Security of the People's Republic of China. This part is under the jurisdiction of the Second Sub-Technical Committee of the National Technical Committee for Fire Protection Standardization. This part was drafted by: Tianjin Fire Research Institute of the Ministry of Public Security, Guangzhou Panyu Shengjie Fire Equipment Co., Ltd. The main drafters of this part are: Zhang Shaoyu, Xi Fengying, Zhang Junna, Tang Xiaoliang, Wu Jianxu, Li Yi, Chi Lifa. The previous versions of the standards replaced by this part are: GB 5135--1985, GB 5135-—1993. V
1 Scope
Automatic sprinkler fire extinguishing system
Part 1: Drinking sprinkler
GB 5135.1—2003
This part of GB5135 specifies the requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. of sprinkler nozzles for automatic sprinkler fire extinguishing systems.
This part applies to sprinkler nozzles for automatic sprinkler fire extinguishing systems. This part does not apply to early suppression fast response (ESFR) sprinklers, multi-hole sprinklers, water mist sprinklers, water curtain sprinklers, on-off sprinklers, large-diameter sprinklers and extended coverage (EC) sprinklers. 2 Normative references
The clauses in the following documents become clauses of this part through reference in this part of GB5135. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this part, however, parties to agreements based on this part are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions apply to this part. GB/T7306 (all parts) 55° sealing pipe thread 3 Terms, definitions, symbols and units
The following terms and definitions apply to this part of GB5135. 3.1
Sprinkler
A water sprinkler that starts automatically under the action of heat within a predetermined temperature range, or is started by a control device according to a fire signal, and sprinkles water according to the designed sprinkler shape and flow rate. 3.2
Conductivity factor is a measure of the heat conduction capacity between the heat sensitive element of the sprinkler and its fixings, with the symbol C and the unit (m/s)°5. 3.3
response time index
response time index
is a measure of the sensitivity of the sprinkler action, expressed as RT-Tuo5, which is the time constant of the heat sensitive element, with the unit of S, and u is the gas flow rate, with the unit of m/s. The symbol of the response time coefficient is RTI, and the unit is (m·s)0.5.3.4
Standard deviation
When the thermal sensor is symmetrical, the standard orientation is the orientation that makes the airflow direction perpendicular to both the axis of the nozzle water flow and the plane where its yoke arm is located. When the thermal sensor is asymmetrical, the standard orientation is the orientation that makes the airflow direction perpendicular to both the axis of the nozzle water flow and the plane where its yoke arm is located, and produces the shortest response time. 3.5
Worst deviation The orientation that makes the airflow direction perpendicular to the axis of the nozzle inlet and produces the longest response time. 3.6
Assembly load
The force applied to the nozzle body when the water pressure at the nozzle inlet is 0. GB 5135.1--2003
Service load
The combined force of the force generated by the 1.2MPa water pressure applied at the nozzle inlet and the force applied to the nozzle body by the nozzle assembly load. 3.8
Design load designIoad
The force applied to the heat sensitive element when the nozzle is subjected to the service load. 3.9
Static operating temperatureThe temperature at which the heat sensitive element of the nozzle is operated in a liquid bath at a certain heating rate. 4 Classification
4.1 Classification by structural form
4.1.1 Closed nozzle
Sprinkler with a release mechanism.
4.1.2 Open nozzle
Sprinkler without a release mechanism.
4.2 Classification based on heat-sensitive elements
4.2.1 Fusible element nozzle
A nozzle that opens when the fusible element melts due to heat. 4.2.2 Glass ball nozzle
A nozzle that opens when the liquid filled in the glass ball expands due to heat, causing the glass ball to burst. 4.3 Classification based on installation position and water distribution 4.3.1 Universal nozzle
A nozzle that can be installed either upright or pendant, and within a certain protection area, sprays water in a spherical distribution downward and upward.
4.3.2 Upright nozzle
A nozzle that is installed upright, with the water flowing upward toward the splash plate. 4.3.3 Pendant nozzle
A nozzle that is installed pendantly, with the water flowing downward toward the splash plate. 4.3.4 Sidewall sprinkler
A sprinkler installed against a wall, which sprays water to one side (half a parabola) within a certain protection area. 4.4 Classification by sprinkler sensitivity
4.4.1 Quick response sprinkler
A sprinkler with a response time coefficient (RTI) less than or equal to 50 (m·s)°.5 and a conductance coefficient (C) less than or equal to 1.0 (m/s)0.5. 4.4.2 Special response sprinkler
A sprinkler with an average response time coefficient (RTI) between 50 (m·s)0.5 and 80 (m·s)0.5 and a conductance coefficient (C) less than or equal to 1.0 (m/s)0.5.
4.4.3 Standard response nozzles
Nose with a response time coefficient (RTI) between 80 (m·s)0.5 and 350 (m·s)0.5 and a conductivity coefficient (C) not exceeding 2.0 (m/s)0.5.
4.5 Special type nozzles
4.5.1 Dry vertical sprinkler
It consists of a special short pipe and a sprinkler installed at the outlet of the special short pipe, and there is a seal at the inlet of the short pipe. Before the sprinkler is actuated, 2
this seal can prevent water from entering the short pipe.
4.5.2 Flush sprinkler
GB 5135.1—2003
A sprinkler in which part of the body (including the root thread) of the sprinkler is installed above the lower plane of the ceiling, while part or all of the heat sensitive elements are below the lower plane of the ceiling.
4.5.3 Embedded sprinkler
Except for the root thread, the whole or part of the body of the sprinkler is installed in the shield embedded in the ceiling. 4.5.4 Concealed sprinkler
Embedded sprinkler with a decorative cover.
4.5.5 Coated nozzle
Nozzle with beeswax or asphalt or other fusible anticorrosive materials on the outside of the uncoated or coated nozzle. 4.5.6 Nozzle with waterproof cover
Nozzle with waterproof cover fixed above the heat sensitive element for use on shelves or open grids to prevent the nozzle installed at a high place from spraying water on the heat sensitive element.
5 Nominal diameter, interface thread, color mark and model specifications 5.1 Nominal diameter and interface thread of nozzle
Nominal diameter and interface thread of nozzle are shown in Table 1. Table 1 Nominal diameter and interface thread of nozzle
Nominal diameter/mm
5.2 Nominal operating temperature and color mark
Nominal operating temperature and color mark of closed wine nozzle are shown in Table 2. Interface thread/in
R1/2,R 3/8
The nominal operating temperature of the glass ball water sprinkler is divided into 13 levels, and the corresponding color markings should be made in the glass ball working fluid. The nominal operating temperature of the fusible element sprinkler is divided into 7 levels, and the color markings should be made on the sprinkler yoke arm or the corresponding position. Table 2 Nominal operating temperature and color marking
Glass ball sprinkler
Nominal operating temperature/℃
Liquid color code
Fusible element sprinkler
Nominal operating temperature/℃
121~149
163~191
204~246
260302
320~343
Yoke arm color code
GB 5135.1—2003
5.3 Model specifications of sprinkler
5.3.1 The model specifications of sprinkler sprinklers consist of type characteristic code (model), performance code, nominal diameter and nominal operating temperature. 5.3.2 The type characteristic code indicates the structural form and characteristics of the product. It consists of no more than 3 capital letters, Arabic numerals or their combination and can be named by the manufacturer. 5.3.3 The performance code indicates the sprinkler distribution type, thermal response type or installation position and other characteristics of the sprinkler, and is composed of the following symbols: General sprinkler: ZSTP
Upright sprinkler: ZSTZ
Drooping sprinkler: ZSTX
Upright sidewall sprinkler: ZSTBZ
Drooping sidewall sprinkler: ZSTBX
General sidewall sprinkler: ZSTBP
Horizontal sidewall sprinkler: ZSTBS
Flush sprinkler: ZSTDQ
Embedded sprinkler: ZSTDR
Concealed sprinkler: ZSTDY
Dry sprinkler: ZSTG
Quick response sprinkler and special response sprinkler are preceded by "K" and "T" respectively and marked with " _\ is separated from the performance code. No symbol is added before the performance code for standard response sprinklers; "C" and "S" are added before the performance code for coated sprinklers and sprinklers with waterproof covers respectively, and are separated from the performance code by \\.
5.3.4 Marking example
The marking of sprinkler sprinklers is as follows:
Nominal operating temperature/℃
-Nominal diameter/mm
Performance code
Type characteristic code
Example 1: M1ZSTX15-93℃ represents M1 type, standard push response, pendent installation, nominal diameter of 15mm, and nominal operating temperature of 93℃.
Example 2: GB2K-ZSTBX20--68℃ represents B2 type, fast response, sidewall type, pendent installation, nominal diameter of 2 0mm, the nominal operating temperature of the sprinkler is 68℃.
6 Technical requirements
6.1 Overall requirements
The manufacturing of sprinkler nozzles should ensure the consistency of their products, and the design and manufacturing should ensure that they cannot be easily adjusted, disassembled and reinstalled.
6.2 Appearance
6.2.1 The outer surface of the sprinkler nozzle should be uniform, without obvious bumps, scratches and deformations, and the surface coating and plating should be complete and beautiful. 6.2.2 The interface thread of the sprinkler nozzle shall comply with the provisions of GB/T7306. 6.2.3 The sprinkler nozzle shall at least be marked with model specifications, manufacturer's name (code) or trademark, production year, certification mark (if certified), etc. on its splash plate or body; for sidewall sprinkler nozzles, the water flow direction should also be indicated. All marks should be permanent marks The marks shall be correct and clear.
6.3 Water pressure sealing and water pressure resistance performance
6.3.1 When the test is carried out according to the method specified in 7.2.1, the nozzle shall not leak during the entire test process. 6.3.2 When the test is carried out according to the method specified in 7.2.2, the nozzle shall not be deformed or damaged. 6.4 Flow coefficient
6.4.1 The flow coefficient K of the nozzle is calculated by the following formula: Q
Where:
P——pressure at the nozzle inlet, in megapascals (MPa); Q—flow rate of the nozzle, in liters per minute (I./min)). GB5135.1—2003
6.4.2 When the test is carried out according to the method specified in 7.3, any measured value and average value of the nozzle flow coefficient K shall comply with the provisions of Table 3. Table 3 Flow coefficient
Nominal diameter/mm
6.5 Water distribution performance
Flow coefficient K
115±6
Dry sprinkler flow coefficient K
115±9
6.5.1 When non-sidewall type water sprinklers are tested according to the method specified in 7.4.1, they shall comply with the provisions of Table 4. 6.5.2 When sidewall type sprinkler nozzles are tested according to the method specified in 7.4.2, they shall wet the entire wall surface below the wall where the sprinkler is located and within 1.22m from the deflector plate and comply with the provisions of Table 5. Table 4 Water distribution requirements for non-sidewall sprinklers
Sprinkling density/
Nominal diameter/mm
Nominal diameter/
(mm/min)
Average sprinkler
Density not less than/
(tn/min)
6.6 Spray volume above and below the splash plate
Flow rate of each sprinkler/
Minimum water density of a single box/
(mm/nin）
Protected area/m2
Water distribution requirements for sidewall sprinklers
Each sprinkler
Flow rate/
(L/min)
Protected area/
Nozzle spacing/m
Nozzle spacing/
Test according to the method specified in 7.5. The amount of water sprayed downward by the general-purpose sprinkler should be 40%~60%. 6.6.1
Number of water collection boxes lower than 50% of the density of water/
The water collection volume of the water collection box at the bottom of the wall on the side where the sprinkler is located
is not less than the total water spraying volume of the sprinkler
. Test according to the method specified in 7.5. The amount of water sprayed downward by the upright and pendant sprinklers should be 80%~~100%. 5
GB5135.1—2003
6.7 Static operating temperature
6.7.1 The static operating temperature of fusible element sprinkler shall be tested in accordance with the method specified in 7.6 and shall not exceed the range specified in the following formula. X±(0.035X+0.62)
Where:
X——nominal operating temperature, in degrees Celsius (℃). 6.7.2 The static operating temperature of glass bulb sprinkler shall comply with the provisions of Table 6 when tested in accordance with the method specified in 7.6. Table 6 Static operating temperature of glass ball nozzle
Nozzle nominal
Operating temperature
Operating temperature
80% of the samples should be operated before
The unit is Celsius
Operating temperature
6.7.3 In addition to the above-mentioned tests, concealed nozzles should also be tested according to the method specified in 7.6.3. The decorative cover should fall off completely within 2 minutes.
6.8 Function
6.8.1 The nozzle should start flexibly when tested according to the method specified in 7.7. 6.8.2 Standard response sprinklers shall clear all deposits within 60 seconds after the release of the heat sensitive element; special response and quick response sprinklers shall clear all deposits within 10 seconds after the release of the heat sensitive element. 6.8.3 If one of the eight samples at a certain pressure has deposits, another 24 identical samples shall be taken to repeat the functional test of the pressure and the installation position. Among all the sprinklers tested at each pressure, the total number of samples with deposits shall not exceed 1. 6.9 Water shock resistance
The sprinklers shall be tested according to the method specified in 7.8. There shall be no leakage or damage. After this test, all samples shall also be subjected to functional tests at a pressure of 0.035MPa and shall comply with the provisions of 6.8.1. 6.10 Working load and frame strength
6.10.1 The working load of the sprinkler supported by the yoke arm shall be determined according to the methods specified in 7.9.1 to 7.9.4. 6.10.2 When a sprinkler supported by a yoke is tested in accordance with the method specified in 7.9.5, the permanent deformation of the frame shall not be greater than 0.2% of the distance between the load support points of the sprinkler.
6.11 Strength of heat-sensitive components
6.11.1 When a glass ball is tested in accordance with the method specified in 7.10.2, it shall meet the following requirements: a) The average breaking load of the glass ball shall not be less than 6 times the average design load of the glass ball; GB 5135.1---2003
For 99% of the samples (p) when the confidence coefficient () is 0.99, the lower limit error of the calculated glass ball breaking load shall be at least b)
2 times the upper limit error of the glass ball design load. Unless other distributions are proven to be more suitable in production or design, normal or Gaussian distributions should be used for calculations.
6.11.2 The fusible element shall be tested according to the method specified in 7.10.3 and shall be able to withstand 15 times the maximum design load for 100h; or meet the following requirements: Ld ≤ 1. 02 Lm2/L.
Where:
L.—maximum design load of the fusible element, in Newton (N); Lm—load when the fusible element is damaged after 1000h, in Newton (N); L. ——load when the fusible element is damaged after 1h, in Newton (N). 6.12 Splash plate strength
The sprinkler shall be tested according to the method specified in 7.11, and its splash plate shall not be loose, fall off, permanently deformed or damaged. 6.13 Fatigue strength
The glass bulb sprinkler shall be tested according to the method specified in 7.12, and the glass bulb shall not be damaged. After this test, all samples shall also be subjected to a functional test under a pressure of 0.035MPa and shall comply with the requirements of 6.8.1. 6.14 Thermal stability
When the glass bulb sprinkler is tested according to the method specified in 7.13, the glass bulb should not be damaged. After this test, all samples should also be subjected to a functional test at a pressure of 0.035MPa and should comply with the provisions of 6.8.1. 6.15 Vibration resistance
When the test is carried out according to the method specified in 7.14, the components of the sprinkler should not be loose or damaged. After this test, all samples should also be subjected to a sealing test and a functional test at a pressure of 0.035MPa and should comply with the provisions of 6.3.1 and 6.8.1. 6.16 Mechanical impact resistance
When the test is carried out according to the method specified in 7.15, the sprinkler should not be damaged. After this test, all samples should also be subjected to a sealing test and should comply with the provisions of 6.3.1.
6.17 Low temperature resistance
The nozzle coating and plating shall not be broken or peeled after the test in accordance with the method specified in 7.16, and the nozzle shall not be damaged. After this test, all nozzles shall also be subjected to sealing test and functional test under 0.035MPa pressure, and shall comply with the provisions of 6.3.1 and 6.8.1.
6. 18 High temperature resistance
The nozzle body shall not be seriously deformed or damaged after the test in accordance with the method specified in 7.17. 6.19 Dynamic thermal performance
6.19.1 When the standard response nozzle, special response nozzle and fast response nozzle are tested in the standard orientation according to the method specified in 7.18.1, their RTI and C shall comply with the provisions of Figure 1. For standard response nozzles and quick response nozzles, any RTI value calculated using C shall be within the range shown in Figure 1. For special response nozzles, the average RTI value calculated using C shall be between 50 (m·s) 0.5 and 80 (m·s) 0\, and any RTI value shall not be less than 40 (m·s) 0.5 or greater than 100 (m·s)°.″. 6.19.2 When testing at an angle deviating from the most unfavorable orientation as specified in 7.18.1.2, each RTI value calculated using C shall not exceed 600 (m·s) 0.5 or 250% of the average RTI value measured in the standard orientation, whichever is smaller. 6.19.3 After the environmental test is carried out according to the method specified in 7.23, the sample shall be subjected to the standard orientation insertion test (or thermal response test) in accordance with the provisions of 7.18.1 (or 7.29) to determine the RTI value (or response time) after the environmental test. The result shall not exceed the corresponding boundary shown in Figure 1 (or the provisions of 6.30). In addition, the average RTI value (or response time) shall not exceed 130% of the average RTI value (or response time) before the environmental test. All RTI values after environmental testing shall be calculated according to the method specified in 7.18.3 using the conductivity coefficient C before environmental testing. 7
GB5135.1-2003
6.20 Ammonia stress corrosion resistance
Special response nozzle
Quick response nozzle
Standard response nozzle
C(m/s)0.5
Figure 1 Standard orientation RTI and C value range
Test according to the method specified in 7.19. The nozzle shall not break, delaminate or Damage. After this test, all samples shall be subjected to sealing test and functional test under 0.035MPa pressure, and shall comply with the provisions of 6.3.1 and 6.8.1 respectively. 6.21 Resistance to sulfur dioxide corrosion performance
Test according to the method specified in 7.20, and the nozzle shall not be damaged by corrosion. After this test, all samples shall be subjected to sealing test and functional test under 0.035MPa pressure, and shall comply with the provisions of 6.3.1 and 6.8.1 respectively. 8
6.22 Resistance to salt spray corrosion performance
GB 5135.1—2003
The nozzle shall not be damaged by corrosion when tested according to the method specified in 7.21. All samples after this test shall be subjected to a sealing test and a functional test at a pressure of 0.035 MPa, which shall comply with the provisions of 6.3.1 and 6.8.1 respectively. 6.23 Resistance to humid gas corrosion
: The nozzle shall not be damaged by corrosion when tested according to the method specified in 7.22. All samples after this test shall be subjected to a sealing test and a functional test at a pressure of 0.035 MPa, which shall comply with the provisions of 6.3.1 and 6.8.1 respectively. .1 and 6.8.1. 6.24 Ambient temperature resistance performance
6.24.1 Uncoated nozzle
When tested according to the method specified in 7.23.1, the uncoated nozzle should not be damaged. After the test, the nozzle samples are subjected to sealing test, static action temperature test, function test and insertion test (or thermal response test) according to the methods specified in 7.2.1, 7.6, 7.7 and 7.18.1 (or 7.29), respectively, and should comply with the provisions of 6.3.1, 6.7, 6.8.1 and 6.19.1 (or 6.30) respectively. 6.24.2 Coated nozzle
When tested according to the method specified in 7.23.2, the coated nozzle and its coating should not be damaged. After the test, the nozzle samples are subjected to sealing test, functional test and static action temperature test according to the methods described in 7.2.1, 7.7 and 7.6 respectively, and shall comply with the provisions of 6.3.1, 6.8.1 and 6.7 respectively.
6.24.3 Decorative cover of concealed nozzle
The decorative cover of concealed nozzle shall not fall off or be damaged when tested according to the method specified in 7.23.3. After this test, the decorative cover shall be installed on the nozzle and subjected to vibration test for 4 hours continuously together with the nozzle according to the method specified in 7.14. There shall be no damage. 6.25 Anti-collision performance
6.25.1 The nozzle shall not be cracked or deformed when tested according to the method specified in 7.24.2. After this test, all samples shall also be subjected to sealing test and functional test under 0.035MPa pressure, and shall comply with the provisions of 6.3.1 and 6.8.1. 6.25.2 The sprinkler with water shield shall also be tested according to the method specified in 7.24.3. The water shield and the connection part with the sprinkler shall not be deformed or damaged.
6.26 The side spraying wine
Test according to the method specified in 7.25. The vertical and drooping sprinkler shall be operated before the n-heptane is burned out, and the adjacent sprinkler shall not hinder its start.
6.27 The protection angle of the water shield
According to 7.26. The protection angle provided by the water shield for the heat-sensitive element of the nozzle should not be greater than 45°. 6.28 Rotation of the water shield
The test is carried out according to the method specified in 7.27. The water shield should not rotate under a torque of 4.0N·m. If the water shield rotates under a torque of 4.0N·m, the change in the average working load of the nozzle should not exceed ±10%. 6.29 Vacuum resistance
The test is carried out according to the method specified in 7.28. The nozzle should not be twisted or damaged. After this test, all samples are tested for sealing according to the method specified in 7.2.1. The results should comply with the provisions of 6.3.1. 6.30 Thermal response performance of flush, embedded and concealed sprinklers When flush, embedded and concealed sprinklers are tested according to the method specified in 7.29, the data error limit calculated from the average response time and the unbiased standard deviation shall not exceed the following values: a) 3.85 minutes for water sprinklers with a nominal operating temperature not exceeding 77°C; b) 3.15 minutes for sprinkler sprinklers with a nominal operating temperature of 78°C to 107°C. The unbiased standard deviation used to calculate the data error limit has a confidence factor of 95% for 99% of the tested sprinklers. 6.31 Woodpile fire extinguishing performance
6.31.1 Sprinklers with a nominal diameter of 10 mm, sidewall type and general type sprinklers are not tested for woodpile fire extinguishing. 6.31.2 Sprinklers with nominal diameters of 15 mm and 20 mm shall be able to control woodpile fires when tested according to the method specified in 7.30. The temperature at the thermocouple 9wwW.bzxz.Net
GB5135.1—2003
should be reduced to below the ambient temperature plus 275℃ within the first 5 minutes after watering. In subsequent tests, the average temperature measured at the thermocouple within any continuous 3 minutes should not exceed the ambient temperature plus 275℃. From the time the temperature under the ceiling drops below the ambient temperature plus 275℃ to the end of the test, the sum of the areas under the ceiling temperature recording curve should be less than the area under the ambient temperature plus 275℃ line.
6.31.3 The mass loss of the woodpile should not exceed 20%. 7 Test method
7.1 Appearance inspection
Compare with the design drawings and other technical documents, check and measure by visual inspection or using general measuring instruments. The results should comply with the provisions of 6.1 and 6.2 of this standard.
7.2 Water pressure sealing and strength test
7.2.1 Install the nozzle sample on the test device, fill the pipeline with clean water, and remove the air in the pipeline. Increase the pressure to 3.0MPa at a rate of (0.1±0.025)MPa/s, maintain the pressure for 3min, and then reduce the pressure to 0. Then increase the pressure from 0 to 0.05MPa within 5s, maintain the pressure for 15s, increase the pressure to 1.0MPa at a rate of (0.1±0.025)MPa/s, maintain the pressure for 15s, and then reduce the pressure to 0. During the test, each sample shall comply with the provisions of 6.3.1.
7.2.2 Install the sample after the water pressure sealing test on the test device used in 7.2.1, increase the pressure to 4.8MPa at a rate not exceeding 2.0MPa/min, maintain the pressure for 1min, and each sample shall comply with the provisions of 6.3.2. 7.3 Flow coefficient measurement
The flow test device is shown in Figure 2. After removing the frame and splash plate from the sample, install it on the test device. The test pressure ranges from 0.05MPa to 0.65MPa, and the flow rate of the nozzle is measured at intervals of 0.10MPa. The pressure measurement accuracy should not be lower than Class 0.5, and the flow measurement accuracy should not be lower than Class 1.0. For each sample, the pressure is first increased from low to high to each measuring point, and then decreased from high to low to each measuring point. Substitute the measured data into the formula in 6.4.1 to calculate the K value and the average value of K at each pressure point. The result should comply with the provisions of 6.4.2.
The static pressure difference between the pressure gauge and the nozzle outlet should be corrected during the test. For type nozzles, the shortest and longest specifications of the product should be taken for testing respectively. Unit: mm
Pressure gauge (accuracy 0.5 level)
A-Steel pipe
Figure 2 Flow test device
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