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JB/T 11880.2-2014 (JB/T11880.2-2014)

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JB/T 11880.2-2014English265 Add to Cart 0--3 minutes. Auto-delivery. Diesel engines. Selective catalytic reduction (SCR) systems. Part2: Urea solution tanks Valid


JB/T 11880.2-2014: PDF in English (JBT 11880.2-2014)
JB/T 11880.2-2014
JB
MECHANICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 27.020
J 93
Filing number: 47526-2014
Diesel engines - Selective catalytic reduction (SCR)
systems - Part 2: Urea solution tanks
ISSUED ON: JULY 09, 2014
IMPLEMENTED ON: NOVEMBER 01, 2014
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 4 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Product model ... 7 
5 Technical requirements ... 7 
5.1 General technical requirements ... 7 
5.2 Performance requirements ... 8 
6 Test method ... 10 
6.1 Specimen ... 10 
6.2 Visual inspection ... 10 
6.3 Inspection of dimensions and tolerances ... 10 
6.4 Tightness test ... 10 
6.5 Vibration durability test ... 10 
6.6 Pressure resistance test ... 11 
6.7 Low-temperature shock resistance test of plastic urea solution tank ... 11 
6.8 Heat resistance test of plastic urea solution tank ... 11 
6.9 Weather resistance test of plastic urea solution tank... 11 
6.10 Environmental stress cracking resistance test of plastic urea solution tank 12 
6.11 Chemical resistance test of plastic urea solution tank ... 12 
6.12 Internal cleanliness test ... 12 
6.13 Ventilation test ... 12 
7 Inspection rules ... 12 
7.1 Classification of inspections ... 12 
7.2 Exit-factory inspection ... 13 
7.3 Sampling inspection ... 13 
7.4 Type inspection ... 13 
8 Marking, packaging, transportation and storage ... 14 
8.1 Marking ... 14 
8.2 Packaging ... 14 
8.3 Transportation and storage ... 15 
Appendix A (Informative) Recommended materials for urea solution tank ... 16 
Appendix B (Normative) Design requirements of filling port ... 17 
Appendix C (Normative) Requirements for urea solution tank level and
temperature sensor ... 25 
Diesel engines - Selective catalytic reduction (SCR)
systems - Part 2: Urea solution tanks
1 Scope
This part of JB/T 11880 specifies the terms and definitions, product model,
technical requirements, test methods, inspection rules, marking, packaging,
transportation and storage of the urea solution tanks in the selective catalytic
reduction (SCR) system.
This part applies to SCR systems for diesel engines and vehicles. SCR systems
for other purposes can also be implemented by reference.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 250 Textiles - Tests for color fastness - Grey scale for assessing
change in color
GB/T 1842-2008 Plastics - Test method for environmental stress-cracking of
polyethylene
GB/T 2828.1-2012 Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 16422.2 Plastics - Methods of exposure to laboratory light sources -
Part 2: Xenon-arc sources
GB 18296 Safety property requirements and test methods for automobile
fuel tank
QC/T 417 (all parts) Road vehicles - connections for on-board electrical
wiring harnesses
QC/T 572 Directives for motor vehicle cleanliness - Measuring method
4 Product model
The product model is compiled as follows:
Example:
NSG-35-475 refers to the urea solution tank with a rated volume of 35 L and a
475-type urea solution tank level and temperature sensor.
5 Technical requirements
5.1 General technical requirements
5.1.1 Working temperature
The operating temperature range of the urea solution tank is -40 °C ~ 85 °C.
5.1.2 Materials
Selection of materials for the urea solution tank and its accessories shall meet
the relevant requirements of the storage quality requirements of urea solution.
Please refer to Table A.1 and Table A.2 for material selection. All materials that
cannot be determined whether they are compatible with the urea solution need
to be tested, to evaluate the material's possible impact on the quality of the urea
solution product.
5.1.3 Structure
5.1.3.1 If the urea solution tank is formed by processing the plastic materials,
the tank can be divided into natural color black color. If there are special
requirements, it shall be negotiated and determined by the supplier and the
buyer.
5.1.3.2 The design of the filling port of the urea solution shall meet the
requirements of Appendix B.
5.1.3.3 In order to meet the requirements of the urea solution tank level and
temperature sensor to test the urea consumption, the parameters of the urea
level sensor shall have a corresponding relationship with the actual volume.
Code of urea solution tank level and temperature sensor
Rated volume
Code of urea solution tank
Carry out the test according to 6.6, the requirements are as follows:
a) Leakage and cracking are not allowed, but permanent deformation is
possible.
b) At room temperature, the dimensional change rate of resistance to
negative pressure is not more than 1%; at 50 °C, the dimensional change
rate of resistance to negative pressure is not more than 3%.
5.2.4 Low-temperature shock resistance of plastic urea solution tanks
After the test specified in 6.7, the urea solution tank is not allowed to leak.
5.2.5 Heat resistance of plastic urea solution tank
Carry out the test according to 6.8, and the requirements are as follows:
a) When filling liquid, the urea solution tank is not allowed to leak;
b) When there is no liquid, there is no abnormal phenomenon such as
deformation or discoloration by visual inspection.
5.2.6 Weather resistance of plastic urea solution tank
After the test specified in 6.9, the comparison grade of the gray scale for
discoloration of the plastic urea solution tank is grade 4 ~ grade 5.
5.2.7 Environmental stress cracking resistance of plastic urea solution
tanks
The environmental stress cracking time of the urea solution tank material is not
less than 200 h.
5.2.8 Chemical resistance
The urea solution tank has no abnormal phenomena such as dissolution,
swelling, discoloration, or cracks.
5.2.9 Internal cleanliness
The total amount of impurities in the urea solution tank assembly is less than
100 mg.
5.2.10 Ventilation
Minimum ventilation of the air vent is not less than 2 L/min.
6.6 Pressure resistance test
The urea solution tank is fixed on the test device in the simulated loading form.
Keep the ambient temperature of 50 °C ± 2 °C. Fill the urea solution tank with
water of rated volume at a temperature of 50 °C ± 2°C. Close the lid. Seal all
inlets and outlets. Apply a pressure of 30 kPa to the tank. Hold the pressure for
5 hours.
Seal all other inlets and outlets of the urea solution tank. Place the urea solution
tank in a metal frame of standard size under the specified test conditions for the
following two tests:
a) Apply a negative pressure of 3.0 kPa to the urea solution tank at room
temperature; measure the dimensional changes on each surface of the
urea solution tank after maintaining the pressure for 20 minutes;
b) After holding the temperature at 50 °C for 5 hours, add a negative pressure
of 3.0 kPa to the urea solution tank at this temperature; measure the
dimensional changes on each surface of the urea solution tank after
maintaining the pressure for 20 minutes.
6.7 Low-temperature shock resistance test of plastic urea
solution tank
It is performed according to the requirements of GB 18296.
6.8 Heat resistance test of plastic urea solution tank
According to the provisions of GB 18296, the urea solution tank is fixed on the
test device in the form of simulated loading. Add 2/3 of the rated volume of water
to the tank at room temperature. Place it at an ambient temperature of 85 °C ±
2 °C (such as placing it in 85 °C ± 2 °C water vapor medium) for 1 h.
If not filled with liquid, place it at 85 °C ± 2 °C ambient temperature for 200 h.
Observe the appearance change after taking it out.
6.9 Weather resistance test of plastic urea solution tank.
Cut a specimen which has a size of 60 mm x 60 from the product. Put it into the
xenon lamp weathering test box, with the outer surface facing the lamp tube.
The blackboard temperature is 63 °C ± 3 °C and the relative humidity is 50% ±
5 %. According to the test specifications as specified in GB/T 16422.2, make it
7.2 Exit-factory inspection
Before the product leaves the factory, it needs to be inspected by the company's
quality inspection department in accordance with the provisions of this part.
After passing the inspection, the product can be delivered only after the product
inspection certificate is issued. The inspection items, requirements and test
methods of the exit-factory inspection shall be implemented in accordance with
Table 2.
7.3 Sampling inspection
The sampling plan and the acceptance quality level AQL of the sampling
inspection of the urea solution tank shall be implemented by the quality
inspection department of the manufacturer in accordance with the relevant
provisions of GB/T 2828.1. The inspection items, requirements and test
methods of the sampling inspection shall be implemented in accordance with
the provisions of Table 2.
7.4 Type inspection
7.4.1 Type inspection shall be carried out if one of the following situations
occurs:
a) Trial type approval of new products or old products after trans-plant
production;
b) There are major changes in structure, materials, and processes that may
affect product performance;
c) Production restoration after one year of suspension;
d) The results of the exit-factory inspection are quite different from the results
of the last type inspection;
e) During normal production, once a year;
f) The national quality supervision agency puts forward the requirements for
type inspection.
7.4.2 The inspection items, technical requirements and test methods of type
inspection shall be implemented in accordance with Table 2.
Appendix B
(Normative)
Design requirements of filling port
B.1 Scope
Appendix B specifies the most basic functional requirements and geometric
dimensions of the filling port of the urea solution tank as well as the compatibility
conditions with the external filling system.
B.2 Terms and definitions
B.2.1 Filling port of urea solution tank
Refers to the necessary device for filling the urea solution on the urea solution
tank assembly, usually including a filler neck, an inlet adapter, a filler cap.
B.2.2 Filler neck
Refers to the connecting part of the urea solution tank where the solution is
filled, the opening of which is the inlet adapter.
B.2.3 Inlet adapter
Refers to the part where the filler neck is connected to the external filling system.
It has a specified geometric size interface and integrates a magnetic ring. This
magnetic ring can prevent the urea solution from being added to the fuel tank
by mistake.
B.2.4 Filler cap
Refers to the parts installed on the filler neck to prevent the urea solution from
overflowing and prevent contamination. It can be temporarily opened or
removed during filling.
B.2.5 Open filling system
Refers to an ordinary filling system that does not require air-tightness between
the filling nozzle and the filler neck, such as using a small volume container to
inject urea solution into the open filling system.
B.2.6 Sealed filling system
Refers to a special filling system that requires air tightness between the filling
nozzle and the filler neck.
system to establish the liquid pressure required for normal operation.
C.2.2 Technical requirements
C.2.2.1 Appearance
The shape, size and tolerance of the sensor shall meet the requirements of the
drawing.
The plating and coating on the surface of the sensor shall be free of defects
such as peeling, spots, blistering, cracks. The fasteners shall not be loose or
damaged. The sign (or lettering) shall be clear and fastened firmly.
C.2.2.2 Tightness (liquid heating only)
After the test specified in C.3.2, no air bubbles are generated at each
connection of the sensor.
C.2.2.3 Insulation resistance
After the test specified in C.3.3, the insulation resistance between any lead wire
of the sensor and the housing shall be greater than 20 MΩ.
C.2.2.4 Pressure resistance
Carry out the test according to the provisions of C.3.4; the burst pressure of the
pipeline where the sensor is subjected to positive pressure shall not be less
than 3 MPa, so as to ensure that the sensor can work normally under a pressure
of not more than 1 MPa.
C.2.2.5 Output signal
Measure the output signal of the sensor according to the provisions of C.3.5;
the value shall meet the requirements of the drawing; the deviation of the
resistance value is within ± 1%.
C.2.2.6 Temperature resistance
Perform the test according to the method specified in C.3.5; the performance of
the sensor meets the requirements of C.2.2.3 and C.2.2.5.
C.2.2.7 Internal cleanliness
The internal impurity content of the urea inlet and outlet pipes of the sensor is
less than 100 mg
C.3 Test method
C.3.1 Appearance inspection
......
 
(Above excerpt was released on 2020-08-02, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/JBT11880.2-2014