This standard specifies the definition, specifications, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of fire-blocking rings. This standard applies to fire-blocking rings for industrial and civil building drainage rigid polyvinyl chloride and other plastic pipes and other fire-blocking seals that can expand and seal pipes when exposed to fire. GA 304-2001 Rigid polyvinyl chloride building drainage pipe fire-blocking ring GA304-2001 standard download decompression password: www.bzxz.net

GA304—2001
Chapter 5, 5.3 of this standard is mandatory, and the rest are recommended.
This standard is formulated based on the relevant provisions of CJJ/T29-1998 "Technical Code for Hard Polyvinyl Chloride Pipe Engineering for Building Drainage", combined with GB50045--1995 "Code for Fire Protection Design of High-rise Civil Buildings" and the actual situation of related products at home and abroad. This standard proposes a unified technical basis for the technical requirements, test methods and inspection rules of hard polyfluoroethylene building drainage pipe fire arresters.
This standard is proposed by the Fire Department of the Ministry of Public Security of the People's Republic of China. This standard is under the jurisdiction of the National Fire Standardization Technical Committee. This standard is drafted and interpreted by the Sichuan Fire Science Research Institute of the Ministry of Public Security. The main drafters of this standard are Yuan Fenglin, Wang Liangwei, Mao Chaojun and He Dayu. 377
1 Scope
People's Republic of China Public Security Industry Standard Fire stopping collar of PVC-U pipe for building drainage GA304—2001
This standard specifies the definition, specifications, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of fire stopping collars. This standard is applicable to fire stopping collars for industrial and civil building drainage plastic pipes such as rigid polyvinyl chloride and other fire-stopping seals that can expand and seal pipes when exposed to fire.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191-2000 Pictorial marking for packaging, storage and transportation
GB/T5836.1-1992 Rigid polyvinyl chloride pipes for building drainage GB/T6388—1986 Shipping and receiving marking for transport packaging GB/T6461—1986 Rating of electroplated specimens after corrosion test of metal covering layer on cathode substrate GB/T 9978-1999
GB/T10125---1997
Fire resistance test methods for building components
Artificial gas and nitrogen corrosion test Salt spray test
Technical code for engineering of rigid polyvinyl fluoride pipes for building drainage CJJ/T 29—1998 More
3 Definitions
This standard adopts the following definitions.
3.1 Fire stopping collar A collar made of a shell made of metal or other materials and a flame retardant expansion core material, which is placed on the outer wall of a plastic pipe such as rigid polyvinyl chloride. In case of fire, the flame retardant expansion core material expands rapidly due to heat, squeezes the pipe, blocks it, and prevents the fire from spreading along the pipe. 3.2 Seal off time
The minimum time from the start of the test to the complete blocking of the test pipe opening by the fire stopping collar under the standard building component fire resistance test conditions. 4 Specifications and markingsWww.bzxZ.net
4.1 Specifications
According to the nominal outer diameter d of the rigid polyvinyl chloride pipe for building drainage, the fire stopping collar is divided into ten specifications: 40, 50, 75, 90, 110, 125, 160, 200, 250, 315;
According to the fire resistance level, it is divided into three levels: A and BC. The fire resistance limit of Class A shall not be less than 3.0h; the fire resistance limit of Class B shall not be less than 2.0h; the fire resistance limit of Class C shall not be less than 1.5h.
4.2 Product marking
Fire arrester code: ZHQ;
The marking order is: fire arrester code, fire arrester specification, fire resistance level; Ministry of Public Security of the People's Republic of China approved 378 on July 23, 2001
2001-12-01 implementation
GA304—2001
Marking example: ZHQ110A means fire arrester for d. 110mm drainage pipe, with fire resistance level A. 5 Technical requirements
5.1 Shell
The shell of the fire arrester is generally made of metal material and covered with a coating for anti-corrosion treatment (except stainless steel). No visible rust and rust spots on the shell surface, cracking, peeling or peeling of the coating and other appearance defects are allowed. The shell's ability to resist salt spray corrosion shall meet the requirements of Table 1. The shell's inner diameter is recommended to be 1 to 3 mm larger than the outer diameter of the installed plastic pipe. In humid environments with corrosive media, it is recommended to use a stainless steel shell fire barrier.
Table 1 Shell's ability to resist salt spray corrosion
Appearance grade
Protection grade
5.2 Flame retardant expansion core material expansion performance
The flame retardant expansion core material should have good expansion performance when not soaked in water or cement slurry and when soaked in water or cement slurry. The expansion volume of the flame retardant expansion core material shall meet the requirements of Table 2. Table 2 Expansion volume of flame retardant expansion core material
Expansion volume
5.3 Sealing time and fire resistance limit
Not soaked
After 48 hours of flooding in water
After 48 hours of immersion in cement slurry
The sealing time and fire resistance limit of the fire barrier ring shall meet the requirements of Table 3. Table 3 Sealing time and fire resistance limit of fire-blocking ring Item
Sealing time/min
Fire resistance limit/h
5.4 The installation of fire-blocking ring and the design and construction of pipelines shall comply with the provisions of CJJ/T29. 6 Test method
6.1 Shell
Technical index
Take a fire-blocking ring shell and cut it into two specimens symmetrically. Take a specimen and conduct the neutral salt spray corrosion resistance test according to GB/T10125. The test time is 48h. The appearance grade and protection grade are evaluated by the method specified in GB/T6461. 6.2 Expansion performance of flame-retardant expansion core material
Take out the flame-retardant expansion core material from a fire-blocking ring, and measure and record its thickness and height with a vernier caliper accurate to 0.05mm or a steel ruler accurate to 0.5mm. Three samples of flame retardant expansion core material were sawed vertically, each with a length of about 50mm and a height of 35-50mm. They were placed in an electric oven and dried at (105±2)℃ for 4h. The samples were taken out from the oven and placed in a desiccator to cool to room temperature. Then two samples were placed in distilled water and (10±1)% (mass ratio) silicate cement slurry with a strength grade of 42.5, respectively, and fully immersed for 48h at room temperature (23±2)℃. They were taken out and placed in an electric oven at a temperature of (105±2)℃ for 4h. They were taken out and placed in a desiccator to cool to room temperature. Weigh about 2g of the sample from the fully immersed sample and the unimmersed sample, respectively, to an accuracy of 10mg, and place them in a crucible with a volume of 150ml, and place them in a resistance furnace at a temperature of (950±10)℃. After keeping the temperature constant for 10min, take them out, and break them up after cooling so that they can pass through a 10-mesh standard sieve (the sieve residue is 0). Then use a 100mL measuring cylinder with a minimum graduation value of 1mL to measure the volume of the sample after expansion. When measuring, shake the material in the measuring cylinder by hand. Calculate the expansion volume according to the following formula:
Where: n—
expansion volume, mL/g;
V-volume of the sample after expansion, mL;
-mass of the sample, g.
6.3 Fire resistance performance
Except as specified in this standard, the fire resistance performance of the fire-blocking ring shall be measured in accordance with the provisions of GB/T9978. 6.3.1 Installation of test specimens
The fire-blocking ring is installed on the floor or wall for fire resistance test. Holes for the test pipes shall be reserved in the floor and wall. When making the test specimens, the holes shall be set to ensure that the minimum distance between the fire-blocking rings and between the fire ring and the heating furnace wall is 500mm, and the center of the wall hole is 1600mm above the test furnace floor. The installation method of the fire-blocking ring shall be sufficient to reflect its actual use. The installation modifications made to enable the test to be carried out shall have no significant impact on the fire resistance performance. The rigid polyvinyl chloride pipe used for the test shall comply with GB/T5836.1 Requirements. During the test, the fire-blocking ring is fixed with metal expansion bolts and other metal parts under the cast-in-place integral C40 concrete floor with a structural thickness of 120mm (the thickness of the protective layer on the fire-bearing surface of the floor is 10mm) or on the fire-bearing side of the clay brick or concrete wall with a thickness of 180mm. The total length of the hard polyvinyl chloride pipe used for the test is 2000mm, and the length of the hard polyvinyl nitride pipe on the back-fire side exposed to the floor or wall is 1000mm. The fire-bearing side pipe mouth is blocked with a plug of the same material or mineral wool. The length of the mineral wool blocking is (50±10)mm. The back-fire side test pipe is fixed with a support at 50mm from the pipe mouth. A thermocouple is installed at the center and symmetrical sides of the outer surface of the test pipe at 25mm from the back-fire side of the floor or wall. The center temperature of the test pipe is measured with a nickel-chromium-nickel-silicon armored thermocouple (K type) with an outer diameter of 3mm. The outer surface temperature of the test pipe should comply with the provisions of GB/T9978-1999 on the back-fire surface temperature measurement of test pieces. The fire resistance test installation is shown in Figure 1: the open installation shall be tested according to Figure a) or Figure c), and the concealed installation shall be tested according to Figure b) or Figure d); the test piece with both open and concealed installation methods shall be tested according to the concealed installation method; the test results shall indicate the installation status of the test piece. 000
Fire surface
a) Installed on the floor (open installation)
Fire surface
b) Installed on the floor (concealed installation)
Figure 1 Schematic diagram of fire resistance test installation of fire barrier ring
Fire surface
c) Installed on the wall (open installation)
GA 304—2001
Man fire surface
d) Installed on the wall (concealed installation)
1—Thermocouple; 2—Concrete floor; 3—Fireproof ring; 4—PVC-U pipe: 5—Wall 6.3.2 Method for determining the blocking time
Figure 1 (end)
From the start of the test to the complete blocking of the pipe by the fireproof ring, the blocking time shall be determined by the following method: a) If the temperature rise at the center of the test pipe is less than 180℃, and the blocking of the fireproof ring can be directly observed with the eyes, the direct observation by the eyes shall be used first. The minimum time when the flame in the heating furnace cannot be seen from the test pipe mouth on the back fire side is the blocking time; b) If the temperature rise at the center of the test pipe is greater than 180℃ and it is inconvenient to directly observe the blocking of the fireproof ring with the eyes, the time when the temperature rise at the center of the test pipe to 180℃ for the last time shall be determined as the blocking time. 6.3.3 Fire resistance limit determination conditions
During the test, when any of the following provisions occurs, it indicates that the fire barrier ring has reached the fire resistance limit. a) The back-fire test tube collapses;
b) After the fire barrier ring seals the pipeline, the average surface temperature of the back-fire test tube exceeds the initial temperature by 140C or the center temperature exceeds the initial temperature by 180C;
c) Flames appear in the back-fire test tube, and the cotton pad is ignited according to the regulations. 7 Inspection rules
The inspection of fire barrier rings is divided into factory inspection and type inspection. 7.1 Factory inspection
The inspection items are the inspection of the appearance defects of the shell specified in 5.1. The appearance inspection of the shell should be carried out one by one. 7.2 Type inspection
If any of the following conditions occurs, the product shall be subjected to type inspection. The type inspection items include all the items specified in 5.1 to 5.3. a) New products are put into production for finalization and appraisal;
b) After formal production, when the product structure, flame retardant expansion core material formula and production process have major changes and may affect product quality; c) Normal production for two years;
d) When production is resumed after more than one year of suspension;
e) When the national or local quality supervision agency proposes an inspection request. 7.3 Sampling
An inspection batch is composed of a production batch under the same material, process and equipment conditions. The number of type inspection samples for each production batch shall not be less than 50, and 5 samples of each specification shall be inspected. 381
7.4 Judgment rules
GA304--2001
The appearance defects of the shell specified in 5.1 in the factory inspection items are considered unqualified. If all items of the product are qualified during the type inspection, the product is judged to be qualified. If the fire resistance limit is unqualified, the product is judged to be unqualified. If one of the remaining items other than the fire resistance limit is unqualified, the unqualified item can be double-inspected with the same batch of products. If the re-inspected items are qualified, the product is judged to be qualified. If the re-inspection is still unqualified, the product is judged to be unqualified. 8 Marking, packaging, transportation, and storage
8.1 The content of the product marking is as follows:
a) product name, specification mark, standard number, trademark, b) manufacturer name and address.
8.2 The packaging mark should include: the shipping and receiving mark on the outer surface of the product packaging material, and the packaging storage and transportation graphic mark. The packaging mark should comply with the provisions of GB191 and GB/T6388.
8.3 The fire barrier ring is packaged in cartons. The product should be accompanied by product certificates, product installation instructions, and random accessories list. 8.4 The product should be protected from rain during transportation. The product should be handled with care during loading and unloading, and throwing is strictly prohibited. 8.5 The product should be stored in a dry and ventilated warehouse.
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