QC/T 1065-2017 (QC/T1065-2017, QCT 1065-2017, QCT1065-2017)
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| QC/T 1065-2017 | English | 339 |
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Road tanker for flammable liquid goods transportation -- Manhole cover
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QC/T 1065-2017
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Standards related to: QC/T 1065-2017
| Standard ID | QC/T 1065-2017 (QC/T1065-2017) | | Description (Translated English) | Road tanker for flammable liquid goods transportation -- Manhole cover | | Sector / Industry | Automobile & Vehicle Industry Standard (Recommended) | | Word Count Estimation | 17,190 | | 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 markings of manhole covers installed on road transport flammable liquid tank vehicles. | QC/T 1065-2017
Road tanker for flammable liquid goods transportation-Manhole cover
Manhole cover for tank vehicle for road transport of flammable liquid dangerous goods
1 Scope
This standard specifies the terms and definitions, requirements, test methods, and inspections of manhole covers installed on tank vehicles for road transport of flammable liquids.
Rules and identification.
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
Manhole cover.
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 6944 classification and article number of dangerous goods
3 terms and definitions
The following terms and definitions apply to this standard.
3.1
Manhole
An opening in the tank that allows operators to enter and exit.
3.2
Manhole cover
The cover of the manhole is closed, and after opening, personnel can enter and exit the tank through the manhole.
3.3
Manhole cover neck ring
The structure on the tank is used for the fixed connection of the manhole cover.
3.4
Manhole cover gasket
Sealing element between manhole cover and manhole seat.
3.5
Emergency pressure limiting device
When the pressure inside the tank is abnormal, a device for quickly releasing the pressure in the tank.
3.6
Emergency relief pressure
Bleed pressure set by the emergency relief device.
3.7
Feed port
The manhole cover has an opening for the medium injection tank.
3.8
Secondary opening safety device
A device for releasing the vapor pressure in the tank in advance before the filling port is fully opened.
4 Technical requirements
4.1 Basic requirements
4.1.1 Manhole covers shall comply with the requirements of this standard and shall be manufactured in accordance with product drawings and technical documents.
4.1.2 The raw materials, purchased parts, outsourced parts and other parts applied to the manhole cover shall meet the requirements of relevant standards and shall be approved by the manufacturer
It can be used only after the home is qualified.
4.2 Structural and functional requirements
4.2.1 The manhole cover shall be provided with a material injection port and an emergency relief device.
4.2.2 The injection port should be fully open and equipped with a secondary opening device.
4.2.3 The manhole cover shall be provided with a spare interface for installing valves such as oil and gas recovery valves, anti-overflow sensors, and breathing valves.
4.2.4 The emergency relief device shall be designed to prevent the accumulation of liquid and the formation of ice.
4.2.5 When closed, keep the manhole cover in a sealed state to prevent liquid or gas from flowing out of the tank.
4.2.6 When the pressure in the tank is lower than the relief pressure, return to the closed state.
4.3 Materials
4.3.1 The selection of materials must fully consider its compatibility with the medium in contact.
4.3.2 Manhole covers should be made of aluminum alloy, stainless steel or carbon steel. Non-metallic materials are not allowed.
4.4 Dimensions
4.4.1 Nominal diameter should not be less than 500
4.4.2 The dimensions of the connection surface between the manhole cover and the manhole seat should meet the requirements of Appendix A.
4.4.3 The diameter of the emergency relief device should not be less than 250mm.
4.4.4 The height of any component installed on the manhole cover should not be higher than the sealing surface of the manhole cover installation 150
4.5 Design temperature range
The design temperature of the manhole cover is generally -20 ~ 50 ° C. When there are special environmental requirements, the design temperature should be 40 ~ 70 ° C.
4.6 Pressure setting
4.6.1 The nominal pressure level of the manhole cover shall not be less than 65 kPa.
4.6.2 The emergency relief pressure value of manhole cover shall be 21kPa ~ 35kPa.
4.7 Manhole cover and seat seal
At 1.5 times the nominal pressure of the manhole cover, the leakage rate shall meet the requirements of Grade A in Appendix B.
4.8 Leak tightness for emergency release
4.8.1 Under pressure of 21kPa or more, the leakage rate of manhole cover shall meet the requirements of Grade B in Appendix B.
4.8.2 At a pressure of 16.8 kPa, the leak rate of the manhole cover shall meet the requirements of Grade A in Appendix B.
4.9 Drop tightness
4.9.1 The leakage rate of the manhole cover shall meet the requirements of class F in Appendix B within 1 min after falling.
4.9.2 After the drop test, the manhole cover, including the fittings mounted on it, shall have no visible leakage.
4.1 0 intensity
The manhole cover should have no obvious deformation and damage under the pressure of.200 kPa or 3 times the nominal pressure.
4.11 Conductive resistance
The resistance between any conductive part on the manhole cover that may be in contact with the medium and the manhole cover must not be greater than 10.
4.1 2 operability
Manhole cover secondary opening device should be able to open and close flexibly without jamming.
5 Test method
5.1 Number of tests
The number of samples for product type test is 2 pieces.
5.2 Manhole cover and seat seal test
5.2.1 The test medium shall be one of air, nitrogen or other inert gas. The temperature of the test medium should be 5 ° C ~ 40.
5.2.2 The duration of maintaining the test pressure shall not be less than 60 s.
5.2.3 The test process shall be carried out in the following order.
a) Install the manhole cover on the test device so that the installation state of the manhole cover is consistent with the normal working state
b) Slowly increase the test pressure to the specified test pressure and maintain the pressure for the specified time
c) Check for leaks on the sealing surface between the manhole cover and the seat ring.
5.3 Emergency release seal test
5.3.1 The test medium should be one of water, air, nitrogen or other inert gas. The temperature of the test medium should be between 5 ° C and 40 ° C.
5.3.2 The duration of maintaining the test pressure shall not be less than 60 s.
5.3.3 The test process shall be carried out in the following order.
a) Install the manhole cover equipped with the emergency relief device on the test device so that the manhole cover is installed in the same state as when it is working normally
Consistent
b) Slowly increase the test pressure to 21 kPa or more, and hold the pressure for the specified time
c) check the leakage of manhole cover emergency relief device;
d) Reduce the test pressure to 16.8 kPa and maintain the pressure for the specified time
e) Check for leaks in the manhole cover emergency relief device.
5.4 Emergency pressure relief pressure test
5.4.1 The test medium should be one of air, nitrogen or other inert gas. The temperature of the test medium should be between 5C and 40 ° C.
5.4.2 The test process shall be carried out in the following order.
a) Install the manhole cover equipped with the emergency relief device on the test bench so that the manhole cover is installed in the same state as when it is working normally.
Consistent
b) Slowly increase the test pressure to the emergency relief pressure specified in 4.6.2.
5.5 Drop test
5.5.1 Test equipment.
The main body of the drop test equipment is a container, and a flange is installed on the side of the container for testing the manhole cover. The experimental equipment should meet
F requirements.
a) The dimensions, tolerances and characteristic structures of the drop test equipment shall conform to those shown in Appendix C
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 shall comply with the requirements shown in Appendix C;
d) The lifting and releasing device shall ensure that the impact test equipment can be lifted to a specified test height and free from that height.
come down;
e) Lifting and guiding devices must not affect the free fall of the test equipment;
f) The design and operation of the falling equipment shall comply with the requirements of local safety regulations and have the function of preventing accidental fall
g) The body of the drop test equipment shall be able to withstand pressures above.200 kPa.
5.5.2 Test method.
a) Install the manhole cover on the flange of the test container. The center horizontal line of the manhole cover must be aligned with the center horizontal line of the flange.
b) Fill the main container with water at the center horizontal line of the mounting flange 1 300
c) Lift the test equipment to the release point and lift the equipment to a height of 1.200 mm
d) stir the sand in the sandbox to make it soft and even, then put on a rubber pad;
e) release the test equipment so that the equipment can freely fall 1.200 mm;
f) Within 1 min after falling, wipe the manhole cover and the mounting flange to be tested, and check the manhole cover for leakage.
5.6 Strength test
5.6.1 The test medium shall be water, kerosene or one of the non-corrosive liquids with a viscosity not less than water. The temperature of the test medium should be 5 ° C
5.6.2 The test pressure is the greater of.200 kPa or 3 times the nominal pressure.
5.6.3 The duration of maintaining the test pressure shall not be less than 10 minutes.
5.6.4 The test process shall be carried out in the following order.
a) Close the injection port and spare ports on the manhole cover;
b) Install the manhole cover on the test device
c) Apply the test pressure to the lower part of the manhole cover and hold it for the specified time
d) Check the manhole cover for deformation and damage.
5.7 Static Conduction Test
The tests were performed in the following order.
a) The manhole cover and its parts should be dried before the test
b) Measure resistance with 500 V DC megohmmeter
c) Measure the static electricity conduction between any conductive parts on the manhole cover assembly that may come into contact with the medium and the manhole cover
, Plug the liquid level indicator hole resistance.
6 Test rules
6.1 Factory inspection
Each manhole cover must be inspected at the factory according to the specified items, and only after passing the inspection by the manufacturer and issuing a product certificate
Leave the factory.
6.1.1 Factory inspection items.
a) appearance;
b) Seal test of emergency relief device;
c) Conduction test.
6.2 Type inspection
6.2.1 Type inspection is generally to be carried out in one of the following situations.
a) When new products are trial-typed;
b) When it is in production, if it is produced continuously for 3 years or when the cumulative output is 10,000 units;
c) After the formal production, if there are major changes in the structure, materials, processes, etc., which may affect product performance;
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 according to 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 manhole cover logo can be cast and engraved on the cover, or it can be permanently fixed on the manhole cover in the form of an identification plate and clearly visible.
7.2 The logo contains at least the following.
a) manufacturer name or trademark;
b) product model;
c) production number or production date;
d) emergency relief pressure of emergency relief devices;
e) other working conditions that require special instructions.
7.3 In the instruction manual of the manhole cover, the medium to which the product is applicable should be specified.
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