Some standard content:
Machinery Industry Standard of the People's Republic of China
Fire resistance test of valves
1 Subject content and scope of application
This standard specifies the general requirements, test systems, test methods and performance requirements for valve fire resistance tests . JB/T 6899--- 93
This standard is applicable to the testing of various nominal diameter valves with fire resistance requirements and nominal pressure PN not greater than 42.0MPa. 2 Reference standards
GH7306 Pipe threads sealed with threads
3 Terminology
3.1 Symmetrical valves
Along the axis passing through the two end faces of the valve body, at the center line of the opening and closing parts A valve with the same internal structural dimensions on both sides. 3.2 Asymmetric valve
Valves with different internal structural dimensions on both sides of the center line of the opening and closing parts along the axis passing through the two end faces of the valve body. 4 General requirements bZxz.net
4.1 Symmetrical valves that can be installed in both directions are tested in one installation direction only. Asymmetric valves that can be installed in both directions should be tested once in each of the two installation directions. The same valve can be used for a second test after renovation, or another identical valve can be used for testing in both installation directions. Valves that can only be installed in one direction should be tested in the specified installation direction. 4.2 Unless the insulation material is an integral part of the structural design of the test valve, any form of insulation material cannot be used to protect it during the test.
4.3 If the test valve is equipped with a gearbox or other similar manual device under normal use, it shall also be installed during the test. If the test valve can be equipped with or without a gearbox or similar manual device under normal use conditions, the test results of the test valve equipped with a gearbox or similar manual device can be used to evaluate the valve without a gearbox or similar manual device. The reverse is not possible. 4.4 If the test valve is equipped with a pressure relief device and the device is an integral part of its structure and the device operates during the fire resistance test, the test shall continue. And the leakage through the device shall be included in the leakage of the test valve. If the pressure relief device is provided only for the safety of the fire resistance test, if the device operates during the test, the test should be stopped. 4.5 The following safety measures should be taken during the fire resistance test: a: All test equipment and the test valve itself should be clean and in good working condition, and appropriate protective devices should be installed around the test chamber;
b. Testers should take protective measures;
For test valves that have sealing pairs on both the inlet and outlet sides and can be sealed simultaneously during use, a pressure relief c.
valve should be connected to the middle cavity.
4.6 The test valve will not be adjusted during the high-pressure test, low-pressure test and operation test stages. 5 Test system
The recommended test system for valve fire resistance test is shown in Figure 1. If other pressure sources can meet the requirements of this standard and ensure safety and reliability, other pressure sources may also be used. The source pressurizes the system. 3
H
8
JB/T6899
93
The minimum gap is 150mm
Slope
Use compression Slope of test system with gas as pressure source
13
b Test system with pump as pressure source
Figure 1 Recommended system for valve fire resistance test
18||tt ||20
1-Pressure source: 2--Pressure regulating valve: 3-Pressure relief valve 4--Water storage container, water level gauge (or similar device); 6.-Water supply valve; 7- Stop valve; 8—pressure gauge; 9 steam blocking pipe: 10—test chamber; 11—test valve; 12—steam nozzle; 13—temperature measuring block; 11—thermocouple for measuring fire zone temperature; 15 and test Pressure gauge connected to the middle cavity of the valve: 16---pressure relief valve connected to the middle cavity of the test valve; 17 stop valve; 18-exhaust valve; 19. Condenser: 20 Measuring container, 21. Fuel supply valve: 22 --General requirements for Shanhui valve 5.1 test system
5.1.1 The test system should not subject the test valve to external forces that may affect the test results. 5.1.2 The method for determining the nominal diameter of the inlet side pipeline directly connected to the test valve is: when the nominal diameter of the test valve is 1N.50mm, it should not be less than half of the nominal diameter of the test valve. When the nominal diameter of the test valve When the diameter DN ≥ 50mm, it should not be less than 25mm. The pipe section at least 150mm away from the test valve should be in the fire zone. The nominal diameter DN of the pipe on the outlet side of the test valve should be between 15mm and 25mm, and its setting should have a certain slope. As shown in Figure 1. 5.1.3 There should be at least 150mm horizontal gap between the test valve and the test chamber wall, and the top of the test chamber should be at least 150mm higher than the top of the test valve, as shown in Figure 1.
5.1.4 When installing the test valve, the valve stem and channel should be in a horizontal position, but the check valve should be installed in its normal operating position. 5.1.5 Use water as the test medium.
5.1.6 Use gas as test fuel.
5.1.7 During the test process, equipment in the test system other than the test valve can be adjusted to ensure that the temperature and pressure values ??meet the requirements of this standard.
5.2 Functions and requirements of special equipment for the test system 5.2.1 The function of the steam choke pipe is to minimize the cooling effect of the liquid at the inlet end of the test valve. 650
JB/T 6899 --- 93
5.2.2 The accuracy of the pressure gauge is not less than level 10.5. The measured pressure value should be within the range of 30% to 70% of the instrument range. 5.2.3 The temperature measuring block is made of carbon steel, and its dimensions are shown in Figure 2. A thermocouple is placed in the center of the temperature measuring block, and the connecting thread between the temperature measuring block and the thermocouple intubation is in accordance with GI37306. For test valves with nominal diameter IDN ≤ 150mm, two temperature measuring blocks should be set up, as shown in Figure 3. For test valves with nominal diameter DN ≥ 150mm, three temperature measuring blocks should be set up, as shown in Figure 4. 5.2.4 Thermocouples are used to measure temperature. The minimum reading of the thermocouple should be less than or equal to 1°C. The settings of thermocouples for measuring fire zone temperature are shown in Figure 3 and Figure 4
5.2.5 The size of the measuring container should be appropriate to collect and measure the medium leaking through the test valve during the test. 5.2.6 The water level gauge is used to measure the water consumption during the test. 5.2.7 The pressure relief valve connected to the middle cavity of the test valve is used to prevent the liquid accumulated in the middle cavity of the test valve from vaporizing and increasing pressure, which may cause the valve body to rupture.
The set pressure of the pressure relief valve is 1.5 times the maximum allowable working pressure of the test valve 20 (. Pipe outer diameter 10.3×wall thickness 1.73
GB7306Re1/8/R1/8||tt| |Thermocouple jack
03.2
88X38X38
Figure 2 Design and size of temperature measuring block
Thermocouple
25
· Temperature measuring block
中
Figure 3 For test valves with nominal diameter DN≤150mm, the settings of the temperature measuring block and the thermocouple for measuring fire zone temperature
.!||tt| |6 Test methods and steps
6.1 Test preparation
Thermoelectric
JB/T 6899
93
+
Temperature correction block| |tt||Figure 4 For test valves with nominal diameter DN>150mm, the settings of the temperature measuring block and the thermocouple for measuring fire zone temperature
6.1.1 The test valve is in a partially open position, open the water supply valve 6. Cut off Valve 7, exhaust valve 18 and stop valve 17. Fill the system with water and remove air. After the system is filled with water, close the stop valve 17, exhaust valve 18 and water supply valve 6; close the test valve 11 and open the stop valve 17. Use water to The system is pressurized, and the pressure is 1.1 times the maximum allowable working pressure of the test valve at 20C. Check whether there is any leakage in the test system. If there is any leakage, it should be eliminated
6.1.2 If the valve's inlet side sealing pair also has Then, when the valve is closed, the amount of water accumulated in the valve cavity should be measured and the value should be recorded. If the water accumulated in the valve cavity flows through the outlet side sealing pair to the metering container 20 during the fire resistance test. 6.2 High-pressure test
6.2.1 The pressure of the high-pressure test is determined as follows: a. ．For test valves with nominal pressure (PN) level, follow the requirements in Table 1; Table 1 Test pressure for valve fire resistance
nominal pressure PV
1.0
1.6||tt| |2.0
2.5
4.0
5.0
6.4(6.3)
10.0
2
High pressure test pressure
0.8
1.2
1.5
1.9
3.0
3.8
5.0)
7.7
Pressure of low pressure test
0.2
0.3
0.4
0. 5
0.7
MPa
Nominal pressure PN
15.0
25.0
42.0
Note: The deviation of test pressure is ±10%.
JB/T6899-93
Continued Table 1
Pressure of high pressure test
11.5
19.2
31.9
b. For other test valves, 75% of the maximum allowable working pressure at 20℃, low pressure test pressure
MPa
6.2.2 Adjust the system pressure to the pressure specified in Article 6.2.1, and maintain this pressure value during the entire high pressure test stage including fire and cooling. One instantaneous pressure loss with a maximum value of 50% of the test pressure is allowed, but the test pressure should be restored within 2 minutes. 6.2.3 Record the reading of the water level gauge 5 and empty the water in the measuring container 20. 6.2.4 Open the fuel supply valve 21. Ignition. 6.2.5 The 30 minutes after ignition is the burning period. During this period, the temperature of the fire zone should be monitored. The average temperature of the two thermocouples 14 is required to reach 760℃ within 2 minutes. The average temperature should be between 760 and 980℃ during the remaining time of the burning period, and the readings of the two thermocouples shall not be lower than 705C.
6.2.6 The average temperature of the thermocouple in the temperature measuring block 13 is required to reach 650℃ within 15 minutes after ignition. The average temperature shall not be lower than this temperature during the remaining time of the burning period, and the readings of the thermocouples in each temperature measuring block shall not be lower than 565C. 6.2.7 During the burning period, the readings of instruments 8, 13, 14, and 15 shall be recorded every 2tmin. The readings of each thermocouple shall be recorded separately. 6.2.8 When the burning time reaches 30 minutes, close the fuel supply valve 21. Immediately measure the amount of water collected in the measuring container 20 to determine the total leakage through the test valve sealing pair during the fire period. Continue to collect the amount of water in the measuring container 20. 6.2.9 Cool the test valve to an external temperature equal to or lower than 100°C by forced cooling or natural cooling, and record the time required for the external surface of the test valve to cool to 100°C. The internal temperature of the test valve can be much higher than the external surface, but it is best to bring the internal temperature and the external surface temperature to equilibrium.
If forced cooling is adopted for the test valve at high temperature, for safety reasons, the manufacturer's opinion should be sought. 6.2.10 When the external surface of the test valve cools to 100°C, record the reading of the water level gauge 5 and the amount of water in the measuring container 20 to determine the external leakage of the test valve.
6.3 Low-pressure test
6.3.1 For test valves with a maximum allowable working pressure less than or equal to 11MPa at 20°C, a low-pressure test should be carried out. 6.3.2 The pressure of the low-pressure test is determined as follows: a. For the test valves of nominal pressure (PN) level, follow the provisions of Table 1; b. For other test valves, take the larger value of 7% of the maximum allowable working pressure at 20°C and 0.2MPa. 6.3.3 After reducing the pressure in the test system to the pressure specified in 6.3.2, detect the leakage through the test valve sealing pair and the external leakage. The leakage detection duration is 5 minutes.
6.4 Operation test
6.4.1 For the test valves with the maximum allowable working pressure at 20°C greater than 11MPa, maintain the pressure in front of the valve at the pressure specified in 6.2.1. For the test valves with the maximum allowable working pressure at 20°C less than or equal to 11MPa, increase the pressure in front of the valve to the pressure specified in 6.2.1.
6.4.2 Open the test valve to the fully open position, and then close the stop valve 17. to connect the pipeline with the test valve body cavity. Record the maximum torque required to operate the test valve.
6.4.3 The test valve is in the fully open position. Under the pressure specified in 6.2.1, detect and record the external leakage of the test valve. The leakage detection duration is 5 minutes.
7 Performance requirements
The performance requirements of the test valve shall be in accordance with the provisions of Table 2. 6353
8 Evaluation of other valves
JB/T 6899-- 93
As long as the basic design of the valve is the same and the non-metallic materials of each sealing part are the same, it is not necessary to test each valve of each diameter and lower force level. The test valve can be used to evaluate other valves according to the following limited conditions. 8.1 Other nominal diameter valves that can be evaluated by the test valve are shown in Table 3. Valves with other nominal pressure grades that can be evaluated by the test valve are shown in Table 4. 8.2
Table 2 Performance requirements for test valves
Test items
High pressure test
Low pressure test 3)
Operation test
Test content
Leakage rate of test valve sealing pair
External leakage rate of test valve!
Leakage rate of test valve sealing pair
External leakage rate of test valve 13
Test duration, min
30 min fire period
30 min fire period + test valve surface
Time required to cool to 100℃
5min
Maximum allowable leakage rate
mm\/min
16000N
AOOOIN
1600DN
800 DN
8 OOU DN
Note: 1) The external leakage of the test valve includes leakage at the valve stem, valve cover connection and valve body connection, but does not include leakage at the connection between the pipeline and the valve. 2) This test is only required for valves that should be subjected to low-pressure tests. Table 3 Other nominal diameter valves that can be evaluated by the test valve Nominal diameter of the test valve
DN
8
10
15
20
25
32
50
65
80
100
125
150
200
250
300
350
400
654
8.10.15
10, 15, 20
15, 20.25
Nominal diameter of valves that can be evaluated
DN
20.25.32, 40
25, 32, 40.50
32, 40.50, 65
40, 50.65, 80
50, 65.80, 100
65.80, 100.125
80, 100, 125, 150
100.125.150, 200
125.150.200.250
150, 200, 250.300|| tt||200.250,300.350.400
250.300、350.400.、450、500
300,350,400.450.500.600
350.400.450.500.600.700
4an
mm
9mark
JB/T 6899 -- 93
Table 4 Other nominal pressure levels that the test valve can assess Nominal pressure of the test valve
PN
1.0
1.6
2.0
2.5
4.0
5.0
10.0
15.0
25.0
42.0
Valves with fire-resistant structures should be marked with "FD"10
Test report The test report generally includes the following contents: a. b. c. d. e. f. The date of the fire test; the location of the fire test; the technical requirements of the fire test; the name and address of the test valve manufacturer; the nominal pressure of the valve that can be assessed PN 1.0.1.62.0 1.6.2.0.2.5 2.0.2.5.4.6 2.5.4.0.5.0 4.0.5, (5.0, 10.0
10.0,15.0
15.0.25.0
25.0.42.0
42.0
A report proving that the test valve has passed the pressure test (can be used Manufacturer's report); MPa
A comprehensive introduction to the test valve, including the test valve name, model, nominal diameter IN, nominal pressure PN, weight, whether to reduce the diameter, valve body, valve cover and internal parts Materials, test valve markings and implementation standards; g.
h.
i.
j.
k.
1.|| tt | Factory name, model and mechanical efficiency; temperature, pressure and other relevant data recorded electrically during the test: leakage rate and external leakage rate of the test valve seal pair measured according to this standard; if the test valve is an asymmetric valve and can be installed in both directions, it should be provided The results of the second test; relevant situations recorded during the test;
Conclusion.
Additional notes:
This standard was proposed by the National Valve Standardization Technical Committee. This standard is under the jurisdiction of the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard is drafted by Hefei General Machinery Research Institute of the Ministry of Machinery Industry and Baigong High Pressure Valve Factory. The main drafters of this standard, Qiu Xiaolai, Lin Jie, and Ni Lusang, are equivalent to the British standard 13S6755--1987 "Valve Testing Part 2: Fire Resistance Test Requirements".
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