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QC/T 1064-2017

Chinese Standard: 'QC/T 1064-2017'
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QC/T 1064-2017English289 Add to Cart Days<=4 Road tanker for flammable liquid goods transportation -- Pressure and vacuum breather vent Valid QC/T 1064-2017
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BASIC DATA
Standard ID QC/T 1064-2017 (QC/T1064-2017)
Description (Translated English) (Road transport Flammable liquids Dangerous goods Tank vehicles Breathing valves)
Sector / Industry Automobile & Vehicle Industry Standard (Recommended)
Word Count Estimation 17,168
Date of Issue 2017-01-09
Date of Implementation 2017-07-01
Regulation (derived from) Ministry of Industry and Information Technology Announcement No.2 of 2017
Summary This standard specifies the terms and definitions, requirements, test methods, inspection rules and signs for breathing valves installed on road vehicles for the transport of flammable liquid dangerous goods.

QC/T 1064-2017
Road tanker for flammable liquid goods transportation-Pressure and vacuum breather vent
Road transport flammable liquid dangerous goods tank vehicle breathing valve
1 Scope
This standard specifies the terms and definitions, requirements, and tests of breathing valves installed on tank vehicles for road transport of flammable liquid dangerous goods.
Methods, inspection rules and signs.
This standard is applicable to the third category of transport stipulated in GB 6944, where the steam pressure at 50 ° C is not greater than 110 kPa (absolute pressure)
Flammable liquids, but not including liquid desensitized explosives or road transport tank vehicles with toxic and corrosive media
Breathing valve.
2 Normative references
The following documents are essential for the application of this standard. For dated references, only the dated version applies to this
standard. For undated references, the latest version (including all amendments) is applicable to this standard.
GB/T 1239.2 Technical specifications for cold rolled cylindrical coil springs Part 2. Compression springs
GB/T 23935 Design and calculation of cylindrical coil spring
GB 6944 classification and article number of dangerous goods
GB/T 7307 55 ° unsealed pipe thread
3 terms and definitions
The following terms and definitions apply to this standard.
3.1
Pressure valve and vacuum breather
Installed on the tank or manhole cover, it can be opened and closed automatically as the pressure inside the tank changes, so that
valve.
3.2
Marked set pressure
Indicate the pressure at the beginning of exhalation and inhalation on the breathing valve.
3.3
Actual set pressure
Examine the pressure when the breathing valve starts to exhale and inhale.
3.4
Flow area
The minimum cross-sectional area of the flow channel between the valve inlet end and the sealing surface of the closing member is used to calculate the theoretical flow child without any resistance effect.
3.5
Flow diameter
Corresponds to the diameter of the runner area.
4 Technical requirements
4.1 Basic requirements
4.1.1 Breathing valves shall comply with the requirements of this standard and shall be manufactured according to product drawings and technical documents.
4.1.2 The raw materials, purchased parts, outsourced parts and other components applied on the breathing valve shall comply with the relevant standards and be produced by the valve
Can only be used after the manufacturer has passed the acceptance test.
4.2 Functional requirements
4.2.1 The breathing valve should be able to balance the pressure difference between the inside and outside of the tank to keep it within the allowable range.
Valves for similar functions.
4.2.2 The breathing valve shall be equipped with a stainless steel wire flame-retarding net of not less than 80 mesh or other parts capable of performing the same flame-proof function.
4.2.3 Pressure setting.
4.2.3.1 The exhalation opening pressure should be set between 6 kPa and I2 kPa.
4.2.3.2 Suction opening pressure should be set at -4 kPa ~-2 kPa.
4.2.4 Measure the opening pressure.
The opening pressure obtained from the actual inspection shall meet the nominal opening pressure requirements of the breathing valve.
4.2.5 Seat tightness.
Under 0.8 times the measured opening pressure, select the holding time in accordance with Appendix A. The valve leakage rate during the holding time should comply with Appendix B.
Level A requirements.
4.2.6 Overturning tightness.
Place the breathing valve in the normal use installation direction, rotate 90 °, 180 ° and 270 about the horizontal axis and hold the breathing valve at the opening pressure
Under a pressure of 22 kPa, the pressure shall be maintained for the time specified in Appendix A, and its leakage rate shall meet the requirements of Grade F in Appendix B.
4.2.7 Fall leakage.
The breathing valve is pressurized into the main container within 1 minute after the drop test, so that the gauge pressure at the centerline of the breathing valve reaches 0.8
The breathing valve measures the positive opening pressure. Select the dwell time in accordance with Appendix A, and the leakage rate shall meet the requirements of Grade B in Appendix B.
4.2.8 Design temperature range.
The design temperature of the breathing valve should be
20 ~ 50; When there are special environmental requirements, the design temperature should be -40 ~ 70.
4.2.9 Materials.
4.2.9.1 The materials used for the manufacture of breathing valves must be fully considered for their compatibility with the media they are in contact with.
4.2.9.2 The housing of the breathing valve should be made of aluminum alloy or stainless steel, and should not be made of iron and non-metal materials.
4.2.10 Spring.
4.2.10.1 Breathing valve spring shall be calculated according to the design of GB/T 23935.
4.2.10.2 Breathing valve springs shall meet the technical requirements of GB/T 1239.2 precision level 2 springs.
4.2.10.3 Each end of the breathing valve spring shall have a supporting plane greater than or equal to 1/2 turn, and the end of the supporting ring shall be tight with the working ring.
4.2.11 Connection.
When using a flange connection, the flange must meet the flange connection size of C.2 in Appendix C; using a thread connection, the thread must meet
Requirements of G1K or G2 in GB/T 7307.
4.2.12 Electrostatic resistance.
The conductive resistance between any conductive part on the breathing valve assembly and the breathing valve body must not be higher than 10.
4.2.13 Ventilation diameter.
The ventilation diameter should be greater than or equal to 19 mm.
5 Test methods and requirements
5.1 Number of tests
The number of type test samples shall be 2 pieces for each diameter.
5.2 Opening pressure test of breathing valve
5.2.1 The test medium can be air or other applicable gas. The temperature of the test medium should be between 5 ° C and 40 ° C.
5.2.2 Install the breather valve on the test fixture so that the valve installation state is consistent with its normal working state; make sure the valve is closed
Closed and sealed, slowly and steadily increase the pressure difference between the valve flap and the valve seat until the leakage begins.
5.2.3 Record the pressure at this time.
5.3 Seat tightness test
5.3.1 The test medium can be air or other applicable gases. The test medium temperature should be 5 ~ 40 ° C.
5.3.2 Install the breather valve on the test fixture so that the valve installation state is consistent with its normal working state; make sure the valve is closed
Closed and sealed, slowly and steadily increase the pressure difference between the valve flap and the valve seat until the measured opening pressure is reached.
5.3.3 After completing the above test, reduce the pressure difference to 0.8 times the measured opening pressure value steadily and slowly, and select the protection according to Appendix A.
Press time.
5.4 Overturning tightness test
5.4.1 The test medium can be air or other applicable gas. The test medium temperature should be 5 ~ 40 ° C.
5.4.2 Install the breathing valve on the test equipment, and the valve installation status should be consistent with its normal working condition; apply the test pressure to
The pressure at the breather inlet end of the breathing valve and the pressure at the breather outlet end of the breathing valve should be atmospheric pressure.
5.4.3 Test the breathing valve by rotating it 90 °, 180 °, and 270 ° around the horizontal axis in the relative normal installation direction. Testing pressure
Next, select the dwell time according to Appendix A.
5.5 Drop test
5.5.1 The test medium can be water and air or other suitable media. The temperature of the test medium should be between 5 and 40.
5.5.2 Test equipment.
The main body of the drop test equipment is a container, and a flange for mounting a test valve is provided on the side of the container. The test equipment shall meet the following
Claim.
a) For the dimensions, tolerances and characteristic structures of the drop test equipment, please refer to Appendix D;
b) The feet should be made of solid steel and cannot be compounded with other materials or adopt shock-absorbing design to absorb impact energy;
c) The impact zone (sandbox) under the feet can refer to Appendix D;
d) The lifting and releasing device should be able to ensure that the drop test equipment can be lifted to the specified test height and free from that degree
come down
e) the lifting and guiding devices must not affect the free fall of the test equipment;
f) The design and operation of the drop test equipment shall comply with the requirements of local safety regulations and have the function of preventing accidental falls;
g) The main tank of the drop test equipment shall be able to withstand the pressure and impact force required for the test.
5.5.3 Test procedure.
The test process is performed in the following order.
a) Install the breather valve assembly on the test equipment mounting flange. The breather centerline should be concentric with the flange centerline
b) Fill the main container with water to 1.3 m above the center line of the mounting flange, and block the liquid level indicator hole;
c) Lift the test equipment to the release point and lift the equipment by 1.2 m 髙;
d) stir the sand in the sandbox to make it soft and even, then put on a rubber pad;
e) release the test equipment to make the equipment free fall 1.2 m;
f) Within 1 minute after falling, pressurize the main container, and select the holding time according to Appendix A. Wipe the tested breathing valve and
Install the flange and observe the leakage rate.
5.6 Static Conduction Test
5.6.1 The breathing valve and its parts should be dried before the test.
5.6.2 Use 500 V DC megohmmeter to measure resistance.
5.6.3 Measure the electrostatic resistance between any conductive part on the breathing valve assembly that may be in contact with the medium and the housing.
6 Inspection rules
6.1 Factory inspection
6.1.1 Each product shall be inspected from the factory according to the specified items, and only after passing the inspection by the manufacturer and issuing a product certificate
Leave the factory.
6.1.2 Factory inspection items.
a) appearance;
b) Opening pressure test of breathing valve;
c) Seat tightness test;
d) Overturning seal test.
6.2 Type inspection
6.2.1 Type inspection shall be carried out in any of the following cases.
a) When new products are trial-typed;
b) When it is officially in production, if it is continuously produced for 3 years or when the production and management directors have accumulated 10,000 units;
c) After the formal production, if the structure, material and process are changed greatly, which may affect the performance of the product;
d) When there is a significant difference between the factory inspection and the type inspection.
6.2.2 In the case of type inspection, if it is a) or b) in 6.2.1, it shall be inspected in accordance with Chapter 4; if it is in c) of 6.2.1,
d) In both cases, only the affected items can be inspected.
7 Identification
7.1 The identification of the breathing valve shall be cast on the body of the valve body, or be permanently fixed on the valve body in the form of identification plates, and shall be clearly visible.
7.2 The logo should include at least the following.
a) manufacturer name or trademark;
b) manufacturer's model;
c) serial number or date of production;
d) opening pressure;
e) nominal diameter;
f) Other working conditions that require special instructions.
Related standard:   QC/T 1107-2019  QC/T 1108-2019
   
 
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