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TB/T 3474 consists of the following two parts under the general title Thread connecting hose for rolling stock:
——Part 1: Metal corrugated hose;
——Part 2: Rubber hose.
This part is Part 2 of TB/T 3474.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces TB/T 1820-2005 Rubber hose assemblies with braid wire for locomotive and rolling stock and TB/T 3086-2003 Technical specification of metal-jacket rubber composite hoses for rolling stock. The following main technical changes have been made with respect to TB/T 1820-2005 and TB/T 3086-2003:
——The type of rubber hose is modified (see Clause 3; Clause 3 of TB/T 1820-2005 and TB/T 3086-2003);
——The technical requirements of rubber hose are modified (see Clause 4; Clause 4 of TB/T 1820-2005 and TB/T 3086-2003);
——The inspection rules of rubber hose are modified (see Clause 6; Clause 5 of TB/T 1820-2005 and Clause 7 of TB/T 3086-2003);
——Bending fatigue test, high-temperature test, burst pressure test, static ozone resistance test of outer rubber layer, ultraviolet resistance fatigue test, minimum bend radius test, oil resistance test of inner rubber layer, ball-passing test, fire test, impulse test, vacuum resistance test, abrasion resistance test and medium resistance test are added for the rubber hose (see 5.6, 5.8, 5.9, 5.10, 5.11, 5.12, 5.13, 5.14, 5.15, 5.16, 5.17, 5.18 and 5.19).
This part was proposed by and is under the jurisdiction of CRRC Qingdao Sifang Rolling Stock Research Institute Co., Ltd.
The previous editions of this part are as follows:
——TB/T 1820-1987, TB/T 1820-2005;
——TB/T 3086-2003.
Thread connecting hose for rolling stock - Part 2: Rubber hose
1 Scope
This part specifies the type, dimension and designation as well as technical requirements, inspection methods, inspection rules, marking, packaging, transport and storage of thread connecting rubber hose for rolling stock (hereinafter referred to as “rubber hose”).
It is applicable to rubber hoses used in oil, water and air pipeline systems of rolling stocks, passenger trains, freight trains and EMUs.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties
GB/T 531.1 Rubber vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness)
GB/T 1184 Geometrical tolerancing - Geometrical tolerances for features without individual tolerance indications
GB/T 1220-2007 Stainless steel bars
GB/T 1682 Rubber, vulcanized - Determination of low-temperature brittleness - Single test piece method
GB/T 1690 Rubber, vulcanized or thermoplastic - Determination of the effect of liquids
GB/T 1804 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests - Air-oven method
GB/T 5563 Rubber and plastics hoses and hose assemblies - Hydrostatic testing
GB/T 5564 Rubber and plastics hoses - Subambient temperature flexibility tests
GB/T 5568 Rubber or plastics hoses and hose assemblies - Hydraulic-pressure impulse test without flexing
GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 2: Taper internal and external threads
GB/T 12721 Rubber hoses - Determination of abrasion resistance of the outer cover
GB/T 14905 Rubber and plastics hoses - Determination of adhesion between components
GB/T 24134-2009 Rubber and plastics hoses - Assessment of ozone resistance under static conditions
TB/T 3218 Air brake fitting guard for railway rolling stock
3 Type, dimension and designation
3.1 Type and dimension
3.1.1 The rubber hose is composed of joint nut, core tube, sleeve and hose. Its structural form is shown in Figure 1; the structural form of metal-jacket rubber composite hose is shown in Figure 2. The end joint dimensions L1 and L2 of the rubber hose are shown in Annex A.
3.1.2 According to the connection mode between the joint and the hose, the rubber hose can be divided into thread compression type and extruded connection type.
3.1.3 The core tube can be divided into ball head type (with code of Q), piping type (with code of J) and handle type (with code of B).
3.1.4 See Annex A for the type and dimension of union, fixed joint and core tube.
3.1.5 The type and dimension of joint nut, sleeve and sheath shall be determined through negotiation between the supplier and the purchaser.
3.1.6 The inner diameter of hoses for rolling stocks, passenger trains and freight trains shall meet those specified in Table 1, and the inner diameter of hoses for EMUs shall meet those specified in Table 2. See Annex A for the outer diameter of hoses.
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a) Both ends of A are ball head type
b) One end is piping type and the other end is handle type
Key
1——Joint nut; 2——Core tube; 3——Sleeve; 4——Hose.
Figure 1 Composition of rubber hose
Dimensions in millimeters
Key
1——Union; 2——Joint nut; 3——Core tube; 4——Sleeve; 5——Sheath; 6——Hose; 7——Fixed joint.
Figure 2 Structural form of metal-jacket rubber composite hose
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Table 1 Nominal diameter of rubber hoses for rolling stocks, passenger trains and freight trains and inside diameter of hoses
In: mm
Nominal diameter Inside diameter of hose d
DN6 φ8
DN8 φ10
DN10 φ12.5
DN13 φ16
DN15 φ19
DN20 φ25
DN25 φ31.5
DN32 φ38
DN40 φ51
Note 1: See product drawings for dimensional tolerances;
Note 2: The inner diameter of metal-jacket rubber composite hose shall be determined through negotiation between the supplier and the purchaser.
Table 2 Nominal diameter of rubber hoses for EMUs and inside diameter of hoses In: mm
Nominal diameter Inside diameter of hose d
DN6 φ(6.4±0.5)
DN8 φ(7.9±0.5)
DN10 φ(9.5±0.5)
DN12 φ(12.7±0.6)
DN16 φ(15.9±0.6)
DN19 φ(19.2±0.6)
DN25 φ(25.4±0.8)
3.2 Designation
The designation of rubber hose shall at least consist of the structural form, nominal diameter, length and standard number of the rubber hose. Examples are given below:
Example 1: Rubber hose in extruded connection with nominal diameter of DN15 and length of 850mm is marked as:
Rubber hose in extruded connection DN15×850 TB/T 3474.2-2018
Example 2: Rubber hose with one end of the one-layer wire braided hose of piping type and the other end of handle type, nominal diameter of DN6 and length L of 326mm is marked as:
Wire braided rubber hose DN6×326-1-JB TB/T 3474.2-2018
4 Technical requirements
4.1 General requirements
4.1.1 The rubber hose shall comply with the product drawings approved by the prescribed procedures, and the provisions of this part.
4.1.2 The normal working temperature of rubber hose is as follows:
a) Rubber hoses for rolling stocks, passenger trains and freight trains: -50℃ to +110℃;
b) Rubber hoses for EMUs: -50℃ to +70℃.
If required, the requirements for working temperature may be determined through negotiation between the supplier and the purchaser.
4.1.3 The maximum working pressure of rubber hose shall be determined upon negotiation between the supplier and the purchaser.
4.1.4 The fire prevention requirements of rubber hose shall be determined upon negotiation between the supplier and the purchaser.
4.2 Material requirements
4.2.1 06Cr19Ni10 stainless steel or other materials not lower than the performance of 06Cr19Ni10 stainless steel shall be preferred for all metal parts such as union, fixed joint, joint nut, core tube and sheath, which shall comply with the provisions of GB/T 1220-2007. Carbon steel may also be used. The material shall be determined upon negotiation between the supplier and the purchaser under special conditions.
4.2.2 Rubber material used for hose shall comply with the provisions of Annex B.
Foreword i
1 Scope
2 Normative references
3 Type, dimension and designation
3.1 Type and dimension
3.2 Designation
4 Technical requirements
4.1 General requirements
4.2 Material requirements
4.3 Manufacturing requirements
4.4 Assembling requirements
4.5 Performance requirements
5 Inspection methods
5.1 Appearance and dimension inspection
5.2 Strength test
5.3 Sealing test
5.4 Test on adhesive force of rubber layer
5.5 Low-temperature flexibility test
5.6 Bending fatigue test
5.7 Joint pull-out test
5.8 High-temperature test
5.9 Burst pressure test
5.10 Static ozone cracking resistance of outer rubber layer
5.11 Ultraviolet resistance fatigue test
5.12 Minimum bend radius test
5.13 Oil resistance test of inner rubber layer
5.14 Ball-passing test
5.15 Fire test
5.16 Impulse test
5.17 Vacuum resistance test
5.18 Abrasion resistance test
5.19 Medium resistance test
6 Inspection rules
6.1 Inspection classification
6.2 End-of-manufacturing inspection
6.3 Type inspection
7 Marking, packaging, transport and storage
7.1 Marking
7.2 Packaging
7.3 Transport
7.4 Storage
Annex A (Informative) Example of type and dimension of joints, hoses and core tubes
Annex B (Normative) Physical and mechanical properties of hose materials
