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

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JB/T 11880.2-2014: Diesel engines. Selective catalytic reduction (SCR) systems. Part2: Urea solution tanks
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
maint...