National Administration for Market Regulation China National Standardization Management Committee released the National Standards of the People's Republic of China, indoor fire hydrant GB3445-2018 replaces GB3445-2005, and 2019-04-01 implemented on 2018-09-17.
Chapters 5, 7 and 9.1.1 of this standard are mandatory, while the rest are recommended.
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
, in addition to editing modifications, compared with GB 3445-2005, the main technical changes of are as follows:
1, the definition of a tee-way indoor fire hydrant has been added (see 3.6);
2, the requirements for the mechanical properties of valve stem , the requirements for the mechanical properties of valve stem , the requirements for the pressure-reducing , the pressure-reducing , and the pressure-regulating performance of (see 5.2.3, 5.13.2, 2005 edition 5.2.3, 5.14.2);
3, the requirements for the rotating parts and handwheel materials of rotating indoor fire hydrant have been added (see 5.2.6, 5.2.7).
1 scope
This standard specifies the terms and definitions, classification, models and basic parameters, technical requirements, test methods, inspection rules, instruction manuals, markings, packaging, transportation and storage of indoor fire hydrants.
This standard is suitable for indoor fire hydrants.
2 Normative reference file
The following files are essential for the application of this file. For reference documents that are dated, only the versions of dated versions are applicable to this document. Any referenced file that does not have dated, its latest version (including all modifications) applies to this file.
GB/T 191 package storage and transportation diagram
GB/T 228.1 Tensile test of metal materials Part 1: Room temperature test method
GB/T 1176 Cast copper and copper alloy
GB/T 1804—2000 General tolerances without tolerances linear and angular dimension tolerances
GB/T 4423 Copper and copper alloy pull rod
GB/T 9439 Gray cast iron parts
GB/T 9969 Industrial product instruction manual general rules
GB 12514 (all parts) Fire interface
JB/T 7273.3 Handwheel
3 Terms and definitions
The following terms and definitions apply to this file.
3.1
Rotary indoor fire hydrant
The plug body can rotate 360° horizontally with respect to the base connected to the water inlet pipeline.
3.2
Reduced pressure indoor fire hydrant
By setting the throttling device in the bolt or in the water outlet of the bolt, an indoor fire hydrant that reduces the outlet pressure after the bolt is achieved.
3.3
Rotary and decompression indoor fire hydrant
Indoor fire hydrant with both rotation and decompression functions.
3.4
Reduced and stable indoor fire hydrant
Set up an automatic throttling device in the plug body or inlet and outlet of the plug body. Relying on the pressure of the medium itself, the throttling area of the throttling device is changed, the water inlet pressure within the specified range is reduced to a certain required pressure, and the water outlet pressure is automatically maintained at a stable indoor fire hydrant.
3.5
Rotary decompression and pressure-regulating indoor fire hydrant
Indoor fire hydrant with both rotation and pressure-regulating functions.
3.6
Reduced diameter tee-way indoor fire hydrant
Add a water outlet with nominal diameter 25mm on the water inlet side of the plug body to connect the indoor fire hydrant to the fire hose reel or the light fire water dragon water inlet valve.
4 Category, model and basic parameters
4.1 Category
4.1.1 According to the type of water outlet, it can be divided into:
a) Single-exit indoor fire hydrant (code name omitted);
b) Double-exit indoor fire hydrant (code name S).
4.1.2 According to the number of bolt valves, it can be divided into:
a) single-valve indoor fire hydrant (code omitted);
b) double-valve indoor fire hydrant (code S).
4.1.3 According to the structure type, it can be divided into:
a) right-angle exit indoor fire hydrant (code name omitted);
b) 45° exit indoor fire hydrant (code name A);
c) Rotary indoor fire hydrant (code name Z);
d) Decompression-type indoor fire hydrant (code name J);
e) Rotary pressure-reducing indoor fire hydrant (code name ZJ);
f) Decompression-stable indoor fire hydrant (code name W);
g) Rotary pressure-reducing and pressure-stable indoor fire hydrant (code name ZW);
h) Reducing and tee-way indoor fire hydrant (code name Y).
4.2 Model
Indoor fire hydrant model preparation is as follows:
Example 1:
The right-angle single-valve single-outlet indoor fire hydrant model with a nominal diameter of 50mm can be expressed as: SN50.
Example 2:
The indoor fire hydrant model with the nominal diameter of 65mm, dual outlet and dual valve, and the decompression and pressure stabilization category code I can be expressed as: SNSSW65-I.
4.3 Basic parameters
The basic parameters of indoor fire hydrants are shown in Table 1.
5 Technical requirements
5.1 Appearance quality
5.1.1 The surface of the casting should be free of defects such as scars, burrs, cracks and shrinkage holes.
5.1.2 Cast iron The outside of the valve body should be painted red; the inner surface should be painted anti-rust paint or other anti-corrosion treatments; the handwheel should be painted black.
5.1.3 The external paint film should be smooth, flat, and consistent in color, without bubbles, flow marks, wrinkles and other defects, and without obvious bumps or scratches.
5.2 Material
5.2.1 The valve body, valve cover and valve disc of indoor fire hydrants should be made of gray cast iron HT200 in accordance with GB/T 9439 or other metal materials with mechanical properties not less than HT200.
5.2.2 valve seat and valve stem nuts for indoor fire hydrants should be made of copper alloy ZCuZn38 in accordance with GB/T 1176 or metal materials with strength and corrosion resistance not lower than ZCuZn38.
5.2.3 The valve stem of indoor fire hydrant should be made of lead brass rod HPb59-1 in accordance with GB/T 4423 or other metal materials with mechanical properties and corrosion resistance not lower than HPb59-1. The mechanical properties of the valve stem are tested according to the method specified in 6.2, and the tensile strength should be greater than 390N/mm².
5.2.4 The throttling device of J, ZJ, W, and ZW indoor fire hydrants should be made of cast copper alloys that comply with the provisions of GB/T 1176 or other metal materials with performance not lower than that of cast copper alloys.
5.2.5 The springs of J-type, ZJ-type, W-type, and ZW-type indoor fire hydrants should be made of corrosion-resistant or anti-corrosion-resistant materials.
5.2.6 The materials in the rotating parts of Z-type indoor fire hydrant should be made of corrosion-resistant materials such as copper alloy or austenitic stainless steel.
5.2.7 The handwheel of indoor fire hydrant should be made of gray cast iron HT200 in accordance with GB/T 9439 or other metal materials with mechanical properties not less than HT200. When made of carbon steel material, the material thickness should not be less than 1.5mm.
5.3 Basic dimensions and tolerances
The basic dimensions of indoor fire hydrants should comply with the provisions of Table 2. Dimensional tolerances should comply with the V-level provisions in GB/T 1804-2000.
5.4 Fire interface
The fire interface optional for indoor fire hydrants should be a KN type inward-button fire interface, and the performance should comply with the provisions of GB 12514.
5.5 Handwheel
The type of handwheel should comply with the provisions of JB/T 7273.3. The diameter of the handwheel should comply with the provisions of Table 3. The tolerance of its dimensions shall comply with the V-level provisions in GB/T 1804-2000. There should be permanent arrows and words on the rim of the handwheel that indicate the direction of the switch.
5.6 Thread
The water inlet of an indoor fire hydrant should be a cylindrical pipe thread, and the thread size of the water inlet should comply with the provisions of Table 3; the valve stem and valve stem nut should be trapezoidal threads.
5.7 Valve stem lifting performance
The assembled indoor fire hydrant valve stem should be smooth and flexible, and there should be no obstacles or looseness. Test according to the method specified in 6.7, the maximum torque of the rotating valve stem should not exceed 8.0 N•m.
5.8 Rotation performance
When performing rotation performance tests on assembled Z-type, ZJ-type and ZW-type indoor fire hydrants according to regulations of 6.8, the valve body should be able to rotate 360°, and the rotation should be flexible. The maximum torque of the rotating valve body should not exceed 10.0N•m.
5.9 Opening height
Except for the decompression and decompression and pressure-regulating indoor fire hydrants, the opening height of other indoor fire hydrants should be no less than 1/3 DN (DN is the nominal diameter of the indoor fire hydrant).
5.10 Water pressure strength
When conducting a water pressure strength test on the strength of the valve body and valve bonnet and the tightness of the material according to the provisions of 6.10, the valve body and valve bonnet should be able to withstand a pressure of 2.4 MPa, and there should be no cracking or leakage for 2 minutes.
5.11 Sealing performance
When performing a water pressure sealing test for assembled indoor fire hydrants according to 6.11, each sealing area should be able to withstand 1.6MPa pressure, and there should be no leakage for 2 minutes.
5.12 Pressure loss
Except for decompression and decompression and pressure-regulating indoor fire hydrants, other indoor fire hydrants should be tested in accordance with the provisions of 6.12. Under the condition of an inlet flow rate of 2.5 m/s, the pressure loss caused by hydraulic friction should not exceed 0.02 MPa.
5.13 Decompression, decompression and pressure stabilization performance and flow rate
5.13.1 Decompression performance and flow rate
The decompression indoor fire hydrant is tested according to the provisions of 6.13.1. The pressure value of its inlet and outlet should be provided by the production unit. The tolerance of the outlet pressure should be ±0.02 MPa, and the flow rate should be greater than 5.0 L/s.
5.13.2 Pressure-reducing and voltage stabilization performance and flow rate
Pressure-reducing and voltage stabilizing indoor fire hydrants are tested in accordance with the provisions of 6.13.2. The pressure stabilization performance and flow rate should comply with the provisions of Table 4, and pressure oscillation should not occur during the test boost and pressure reduction process.
5.14 Corrosion resistance
Corrosion resistance test is carried out according to the regulations of 6.14, and the sample should not cause corrosion damage. After the test, the valve stem lifting performance, rotation performance and sealing performance should be inspected, and the results of should comply with the provisions of 5.7, 5.8 and 5.11 respectively.
6 Test method
6.1 Appearance
Visually measure the appearance quality of indoor fire hydrants.
6.2 Valve stem material
6.2.1 After removing the valve stem of the indoor fire hydrant, process it into a test rod according to the regulations of GB/T 228.1.
6.2.2 Test steps are carried out according to the provisions of GB/T 228.1, and the value of the tensile strength of the valve stem is recorded.
6.3 Basic size inspection
Place the indoor fire hydrant vertically on the flat plate, use a general measuring tool to measure and record the sizes of each part of the indoor fire hydrant.
6.4 Fire interface
Visually measure the type of fire hydrant optional fire interface for indoor fire hydrants. Verify its performance according to the method specified in GB 12514.
6.5 Handwheel
Use a general measuring tool to measure the size of each part of the handwheel and visually measure the appearance of the handwheel.
6.6 Thread
Use a thread gauge or other thread measurement tools to measure the thread.
6.7 Valve stem lifting performance
6.7.1 Test device
The test device includes:
———pressure test pump and configuration of pressure stabilization device;
——pressure gauge: Accuracy is not less than 1.5 level, and range is not more than 6 MPa;
——Stopwatch.
6.7.2 Test preparation
Clear oil and dirt in the valve body cavity, install the indoor fire hydrant on the test device, so that the valve stem is in a horizontal position, the water outlet is upward, and fill water to remove air in the body cavity.
6.7.3 Test steps
Turn the hand wheel with your hand to check the flexibility of the valve stem during the entire opening process with intuitive and hand feel. Turn the handwheel by hand to close the valve disc, pressurize from the inlet end, and gradually increase the pressure to 1.6 MPa, use a measuring tool to measure the maximum torque value required for the valve stem to rotate during the entire opening of the valve disc.
6.8 Rotational performance
6.8.1 Test device is the same as the provisions of 6.7.1.
6.8.2 Test preparation is the same as the provisions of 6.7.2.
6.8.3 Turn the handwheel by hand to close the valve disc, pressurize from the inlet end, and gradually increase the pressure to 1.6 MPa, rotate the valve body to check the rotation angle and flexibility of the valve body with intuitive and hand feel. Use a measuring tool to measure the maximum torque value required for the rotation of the valve body.
6.9Open height
Place the indoor fire hydrant vertically on the flat plate, use a height ruler to measure the rise distance of the valve stem from the closed position to the maximum open state, and measure and record its value.
6.10 Water pressure strength
6.10.1 Test device is the same as the provisions of 6.7.1.
6.10.2 Test preparation is the same as the provisions of 6.7.2.
6.10.3 Turn the hand wheel by hand to make the valve disc in the maximum open position, use a cover to seal the fire interface of the outlet end, and pressurize the water from the inlet end. After the pressure gradually rises to 2.4 MPa, keep the pressure for 2 min, and use a copper hammer with a handle length of no more than 200 mm and a mass of 0.5 kg to tap the valve body bonnet to observe the results.
6.11 Sealing performance
6.11.1 Test device
Test device is the same as the provisions of 6.7.1.
6.11.2 Test preparation
Test preparation is the same as the provisions of 6.7.2.
6.11.3 Test steps for sealing performance between valve disc and valve seat
Turn the hand wheel by hand to close the valve disc, pressurize from the inlet end, and after the pressure gradually rises to 1.6 MPa, keep the pressure for 2 min, and observe the results.
Note: Turn the hand wheel by hand to achieve sealing between the valve disc and the valve seat without borrowing tool assistance.
6.11.4 Test steps for sealing performance of other connection parts
Seal the outlet end, lift the valve disc to the maximum opening position, and pressurize water from the inlet end. The pressure gradually increases to 1.6 MPa, hold the pressure for 2 min, and observe the results.
6.11.5 Sealing performance test steps for rotating indoor fire hydrants
After performing 100 rotation tests of rotating indoor fire hydrants 0°~360°, turn the handwheel by hand to close the valve disc, pressurize from the inlet end, and after the pressure gradually rises to 1.6 MPa, keep the pressure for 2 minutes. The valve disc and the valve seat, the valve base and the bolt body should comply with the provisions of 5.11. Then seal the outlet end, lift the valve disc to the maximum opening position, and pressurize water from the inlet end. After the pressure gradually increases to 1.6 MPa, keep the pressure for 2 min and observe the results.
6.12 Pressure loss
6.12.1 Test preparation
Clear the oil and dirt in the indoor fire hydrant, install the pipes as shown in Figure 1.
6.12.2 Test steps
Open the valve disc to the maximum position, a single-valve double-outlet indoor fire hydrant seals a water outlet, and a double-valve double-outlet indoor fire hydrant needs to close a valve disc, adjust the opening height of the shut-off valve and throttle valve, so that the inlet flow rate is maintained at 2.5 m/s. Use a differential pressure transmitter to measure the pressure difference between the inlet and outlet.
6.13 Decompression, decompression and voltage stabilization performance and flow rate
6.13.1 Decompression performance and flow rate
6.13.1.1 Test preparation is the same as the provisions of 6.12.1.
6.13.1.2 Open the valve disc to the maximum position, manually adjust the pressure reduction indoor fire hydrant throttling device to the post-pin pressure value provided by the production unit, adjust the opening height of the shut-off valve and the throttling valve, so that the inlet water pressure is raised to a certain value in the technical parameters provided by the production unit, and record the post-pin pressure value and flow rate.
6.13.2 Pressure reduction and voltage stabilization performance and flow rate
6.13.2.1 Test preparation is the same as the provisions of 6.12.1.
6.13.2.2 Open the valve disc to the maximum position, adjust the opening height of the shut-off valve and throttle valve, so that the water pressure in the indoor fire hydrant water inlet slowly rises to each pressure value specified in Table 4, record the post-pin pressure value and flow rate at each pressure point, and observe whether there is pressure oscillation during the test boost and pressure reduction process.
6.14 Corrosion resistance
6.14.1 Before the test, soak the surface of the test piece with neutral cleaning solution, then rinse it with clean water, and then place it in the salt spray box according to the normal installation state.
6.14.2 The test conditions for the salt spray corrosion test are as follows:
a) Salt solution concentration: 50 g/L±1 g/L;
b) Salt spray sedimentation rate: 1.0 mL/h~2.0 mL/h (in the 80cm² horizontal collection area);
c) The pH value of the salt solution at 35°C should be kept within the range of 6.5~7.2;
d) The space temperature for storing the test pieces in the salt spray box is 35°C±2°C;
e) The spray method adopts continuous spraying for 8 h, and then stops spraying for 16 h. This is a cycle, with a total of five cycles. When stopping spraying, do not heat and turn off the salt spray box to allow it to cool naturally.
6.14.3 After the test is completed, take out the test piece, rinse the surface of the test piece with flowing cold water, and dry it at room temperature for more than 24 hours. After drying, the sample is inspected for valve stem lifting performance, rotation performance and sealing performance according to the regulations of 6.7, 6.8 and 6.11 respectively, and the results are recorded.
7 Inspection Rules
7.1 Type Inspection
7.1.1 Type Inspection should be carried out when any of the following situations occur:
a) trial formulation and type identification of new products;
b) After the formal production is put into production, there are major changes in the product structure, materials, production processes, etc., which may affect the performance of the product;
c) Production is suspended for more than one year and resumed production;
d) Production is transferred to the factory or relocated to other places;
e) After rectification of major quality accidents;
f) When the quality supervision agency puts forward type inspection requirements in accordance with the law.
7.1.2 Type inspection items should be all items in Chapter 5 and 9.1.1.
7.1.3 Random sampling should be performed for type inspection. The batch of samples is no less than 100, and the number of samples is 3 for each model.
7.1.4 The results of type inspection should comply with all the requirements of this standard.
7.2 Factory inspection
7.2.1 Indoor fire hydrants should be inspected by the manufacturer.
7.2.2 The full inspection items for factory inspection should include at least the items specified in 5.1 and 5.11. The random inspection items for factory inspection are all items except 5.1, 5.11, and 5.14.
7.2.3 If the factory inspection results fail, double sampling will be allowed in the same batch of products for re-inspection. If the re-inspection is passed, the product batch will be judged as qualified; if the product batch still fails after re-inspection, the product batch will be judged as unqualified.
8 instruction manual
Indoor fire hydrant instruction manual should be written in accordance with the provisions of GB/T 9969, and should include at least the following contents:
a) product name and model;
b) working principle;
c) main performance parameters;
d) installation and use and maintenance instructions and precautions;
e) after-sales service;
f) implementing standards;
g) manufacturer name, detailed address, postal code and telephone number.
9 logo, packaging, transportation, storage
9.1 logo
9.1.1 product logo
Model, specification, trademark or factory name should be cast on the valve body or valve cover of each product. If marked at the six squares of the valve body, it should be cast in a concave shape. Text, symbols, graphics, etc. should be intuitive and eye-catching.
9.1.2 Packaging Mark
The following marks should be included on the product packaging box:
a) Product name, model, manufacturing date or product number;
b) Manufacturing factory name, factory address, postal code, telephone number;
c) Packaging storage and transportation diagram mark that meets the requirements of GB/T 191.
9.2 Packaging
9.2.1 When packaging indoor fire hydrants, the valve disc should be closed, and anti-rust grease should be applied to the threads.
9.2.2 Pack the indoor fire hydrant with paper or plastic bag and put it into a hard paper packaging box. Depending on the specifications and models, it is assembled in a few boxes in the packaging box. After sealing, tie it with a packaging belt. The bundling should be firm and reliable.
9.2.3 The following documents should be contained in the packaging box:
a) Product Certificate;
b) Product Instruction;
c) Random Attachment List.
9.3 Transport
When transporting and loading and unloading indoor fire hydrants, you should pay attention to rain protection and avoid collisions and heavy pressure.
9.4Storage
Indoor fire hydrants should be stored in a dry and ventilated room to prevent moisture. They are not allowed to be reversed or contact with corrosive gases.
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