TB/T 3475.8-2020 English PDF (TBT3475.8-2020)

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TB/T 3475.8-2020: Components of diesel engine for locomotive and DMU - Part 8: Turbocharger
TB/T 3475.8-2020
RAILWAY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 45.060.10
S 42
Replacing TB/T 1383-2011
Components of diesel engine for locomotive and DMU - Part
8: Turbocharger
ISSUED ON: MAY 29, 2020
IMPLEMENTED ON: DECEMBER 01, 2020
Issued by: National Railway Administration
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions... 6 
4 Technical requirements ... 7 
5 Inspection methods ... 9 
6 Inspection rules ... 13 
7 Marking, packaging, transport, storage ... 16 
Appendix A (Normative) Determination method of cleanliness ... 18 
Appendix B (Normative) Performance test of turbocharger ... 22 
Appendix C (Normative) 100-h test condition of turbocharger ... 30 
Components of diesel engine for locomotive and DMU - Part
8: Turbocharger
1 Scope
This Part of TB/T 3475 specifies the terms and definitions, technical requirements,
inspection methods, inspection rules, marking, packaging, transport, storage of the
axial-flow turbocharger, which is used in the diesel engine for locomotive and DMU
(hereinafter referred to as turbocharger).
This Part applies to turbochargers, which is used in the diesel engine for locomotive
and DMU.
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) is
applicable to this standard.
GB/T 191 Packaging - Pictorial marking for handling of goods (GB/T 191-2008,
ISO 780: 1997, MOD)
GB 253-2008 Kerosene
GB/T 1786 Forging tortillas ultrasonic testing method
GB/T 4118-2008 Trichloromethane for industrial use
GB/T 6402-2008 Steel forgings - Method for ultrasonic testing
GB/T 6519 Ultrasonic inspection of wrought aluminium and magnesium alloy
products
GB/T 13306 Plate
GB/T 21563-2018 Railway applications - Rolling stock equipment - Shock and
vibration tests (IEC 61373:2010, MOD)
HB/Z 60 Radiographic inspection
HB/Z 61 Penetrant inspection
The speed of turbocharger, which is greater than or equal to 110% of the rated speed,
AND at which the turbocharger can safely run continuously for more than 24 hours.
3.7
Maximum gas inlet temperature
The maximum temperature, at which the turbine can work safely for a long time.
4 Technical requirements
4.1 Requirements for working environment
4.1.1 The diesel engine power, which is matched by the turbocharger, under the
following environmental conditions, does not need to be corrected:
a) The altitude is not higher than 1500 m;
b) Atmospheric ambient temperature: -40 °C ~ +40 °C.
4.1.2 When the turbocharger is used in an area above 1500 m above sea level OR the
atmospheric temperature is greater than +40 °C, the influence of atmospheric pressure
and ambient temperature in the area shall be considered.
4.1.3 When it exceeds the scope specified in 4.1.1 and 4.1.2, it shall be determined,
through negotiation between the supplier and the buyer.
4.1.4 The maximum intake vacuum of the turbocharger shall be less than or equal to 4
kPa; the maximum exhaust back pressure of the turbocharger shall be less than or equal
to 3 kPa (except for those with exhaust gas aftertreatment system).
4.2 Basic requirements
4.2.1 The turbocharger shall be manufactured, in accordance with the product drawings
and technical documents, which are approved by the prescribed procedures. It shall
comply with the provisions of this Part.
4.2.2 The main parts of the turbocharger (main shaft, turbine disc, turbine blade, integral
casting turbine, wind guide wheel, compressor impeller) shall be subject to non-
destructive testing; the results shall comply with the provisions of the technical
documents.
4.2.3 The shell, which is equipped with cooling water cavity, shall not leak; repair is
not allowed.
4.2.4 The outlet area or code of the nozzle ring of the turbocharger, AND the area or
code of the inlet throat of the diffuser shall comply with the provisions of the relevant
technical documents. Such information shall be engraved in the designated position
AND recorded in the exit-factory documents.
4.2.5 The assembly clearance of the turbocharger and its main components shall comply
with the provisions of the product drawings or technical documents.
4.2.6 After the initial operation test of the turbocharger, there shall be no abnormality.
4.3 Performance requirements
4.3.1 After carrying out the vacuum prestressing overspeed test at room temperature for
the center perforated compressor impeller and turbine disc, the deformation of the inner
hole shall meet the requirements of the technical documents.
4.3.2 The cleanliness of the turbocharger is the total weight of impurities, which are
contained in the lubricating oil passages in and out of each turbocharger AND the
surfaces of the parts in contact with the lubricating oil; the cleanliness limit is 400
mg/set.
4.3.3 The dynamic balance accuracy of the guide wheel, compressor impeller, bladed
shaft, rotor assembly of the turbocharger shall comply with the provisions of the product
drawing.
4.3.4 The oil inlet temperature of the turbocharger is related to the quality of the oil
used by the diesel engine. It shall be adapted to the requirements of the matching diesel
engine.
4.3.5 Performance requirements of the turbocharger's calibration operating point:
a) When the rotational speed is less than 20000 r/min, the rotational speed deviation
shall be controlled within the range of ±100 r/min. When the rotational speed is
greater than or equal to 20000 r/min, the rotational speed deviation shall be
controlled within the range of ±0.5% of the specified value.
b) The pressure ratio deviation shall be controlled within the range of ±1.5% of the
specified value.
c) The air flow deviation shall be controlled within ±2% of the specified value.
d) The total efficiency of the turbocharger shall be greater than or equal to the
specified value; the specified value shall not be lower than 58%.
4.3.6 After the turbocharger is tested at the highest speed, there shall be no damage to
parts or appearance deformation; there shall be no looseness, air leakage, oil leakage or
water leakage at the connection.
4.3.7 When the turbocharger is running under the calibration condition, the ratio -- of
the calibration flow TO the air flow value at the surge point at the equal pressure ratio
5.1.5 Ultrasonic inspection of turbine disc blanks shall be carried out, in accordance
with GB/T 1786.
5.1.6 The X-ray inspection of turbine blade blanks and integrally cast turbine blanks
shall be performed, according to HB/Z 60.
5.2 Vacuum prestressing overspeed test at room temperature
The compressor impeller and turbine disc, which have central perforation, shall be
subjected to the vacuum prestressing overspeed test at room temperature. The
overspeed speed shall be greater than or equal to 110% of the maximum speed; the test
time shall not be less than 3 minutes.
5.3 Cleanliness inspection
Carry out cleanliness inspection, according to Appendix A.
5.4 Rotor dynamic balance inspection
Carry out the rotor dynamic balance inspection, according to the provisions of Chapter
9 in JB/T 9752.3-2014.
5.5 Housing tightness inspection
The housing, which is equipped with cooling water cavity, can be subjec...