Some standard content:
Ship Industry Standard of the People's Republic of China
CB/T3795--1996
Airbag for ship uploading or down to launching way
Published on December 23, 1996
Implemented on June 1, 1997
CB/T3795-1996Www.bzxZ.net
Ship airbag uploading and launching process refers to the technical method of completing the uploading and launching of ships through airbags. When a ship is launched by this process, the lifting airbag is inflated first, and the ship is moved in a controlled manner under the traction of the winch and wire rope to complete the launching process. When the ship is launched, the rolling airbag should be used first, and then the lifting airbag should be used to cushion the pier after positioning. The basic principle of ship launching and launching is that the airbag is inflated at low pressure and carries a large area. This standard was proposed by the Ship Repair Sub-Technical Committee of the National Technical Committee for Standardization of Marine Ships. This standard is under the jurisdiction of Tianjin Ship Repair Technology Research Institute. This standard was drafted by the Comprehensive Technical and Economic Research Institute of China State Shipbuilding Corporation, and Jinan Changlin Air Bag Container Factory participated. The main drafters of this standard are: Hu Boyang, Huang Lishen, Sun Juxiang, Zhang Shuxun, Li Huanrong. 1 Scope
Ship Industry Standard of the People's Republic of China
Air bag for ship up to or
down to launching way
CB/T3795-1996
Classification number: R30
This standard specifies the definition, structural dimensions, product marking, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of air bags for ship up to or
down to launching way (hereinafter referred to as "air bags"). This standard applies to air bags made of nylon cord fabric with rubber coating. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB527-83
GB/T 52892
GB/T531--92
GB/T532—89
GB3512-89
3 Definitions
General requirements for physical test methods for vulcanized rubber Determination of tensile properties of vulcanized rubber and heat shrinkable rubber Test method for Shore A hardness of vulcanized rubber
Determination of adhesion strength of vulcanized rubber to fabric Test method for hot air aging of rubber
The following definitions are used in this standard.
3.1 Low-pressure airbag
Airbag with working pressure:
<0.07 MPa (D is the nominal diameter of the bladder, m). D
3.2 Medium-pressure airbag
Airbag with working pressure of ~
<9.10 MPa (D is the nominal diameter of the airbag, m). 3.3 High-pressure airbag
Airbag with working pressure equal to or greater than 0.10 MPa (D is the nominal diameter of the airbag, m). Working pressure equal to or greater than
3.4 Airbag
Cylindrical part of the airbag.
3.5 Nozzle
Nozzle installed at both ends of the airbag for inflation and deflation. 3.6 Dip head
The conical part where the airbag body and the nozzle are connected.
3.7 Working height
The actual height of the compressed airbag when the ship is lifted, placed on the pier or launched into the water. Approved by China State Shipbuilding Corporation on December 23, 1996 and implemented on June 1, 1997
4 Product structure and dimensions
4.1 Structural type
The airbag structural type is shown in Figure 1
4.2 Specifications and dimensions
CB/T3795.1996
1—Ball head, 2—Ball body; 3—Ball nozzle, 4—Safety valve Figure 1 Airbag structural type
The nominal diameter D of the body is 0.8, 1.0, 1.2, 1.5, 1.8 and 2.0m, a total of 6 types. The length Le of the body is determined according to actual needs.
5 Product marking
5.1 Marking composition
Product name
5.2 Marking example
Standard number
Working pressure, MPa
Ball length, m
Ball nominal diameter, 1
Airbag with nominal diameter of 0.8m, length of 5.0m and working pressure of 0.038MPa Airbag 0.8×5.0-0.038CB/T3795-19962
6 Technical requirements
6.1 Raw material performance requirements
6.1.1·Nylon cord fabric performance
CB/T3795-1996
6.1.1.1 The density of nylon cord fabric is (95±5) roots/10cm width. 6.1.1.2 The breaking strength of nylon cord fabric shall not be less than 205.8N/piece. 6.1.2 Physical and mechanical properties of rubber
The requirements for the physical and mechanical properties of rubber are shown in Table 1. Table 1
Physical and mechanical properties of rubber
Property name
Tensile strength
Elongation at break
Hardness (Shore A)
Adhesion between cord layers
, unit
Outer layer rubber
≥420
Cord rubber
≥500
After 70℃, 16h hot air aging test, the physical and mechanical properties of rubber are shown in Table 2. Table 2 Physical and mechanical properties of rubber after hot air aging test Property name
Reduction rate of tensile strength
Reduction rate of elongation at break
Change in hardness (Shore A)
6.2 Technical parameters
Reduction rate
Inner liner rubber
The technical parameters of low-pressure, medium-pressure and high-pressure airbags of various diameters, such as working pressure, working height, and bearing capacity per meter of the bladder, are shown in Table 3. -1996
CB/T3795-
9500>~660'0
0>~890'0
001'0>~020'0
0>~020\0
880*0~800
6.3 Performance requirements
6.3.1 Dimension deviation
The deviation of the main dimensions of the airbag shall be in accordance with Table 4.
6.3.2 Elastic deformation
CB/T3795-1996
Table 4 Deviation of the main dimensions of the airbag
Main dimensions
When using 1.2 times the working pressure as the test pressure, the diameter deformation shall not exceed 5%6.3.3 Safety factor
The safety factor shall not be less than 4.5.
6.3.4 Air tightness
After inflation for 1 hour, the pressure drop shall not exceed 5%.
6.3.5 Appearance requirements
The line shall be smooth, without cracks, bubbles, heavy skin, impurities, obvious dirt and other visual defects. 6.3.6 Safety inflation device
A safety valve shall be installed on the nozzle of the bag, and the tripping pressure of the safety valve shall be 1.25 times the working pressure. 7 Test methods
7.1 Raw material test methods
7.1.1 The determination of rubber tensile strength and elongation at break shall be tested in accordance with the provisions of GB527 and GB/T528, and the results shall meet the requirements of Table 1. 7.1.2 Rubber hardness test
The test shall be carried out in accordance with the provisions of GB/T531, and the results shall meet the requirements of Table 1. 7.1.3 Rubber hot air aging test
The test shall be carried out in accordance with the provisions of GB3512, and the results shall meet the requirements of Table 2. 7.1.4 The adhesion strength test of vulcanized rubber and cord fabric shall be carried out in accordance with the provisions of GB/T532, and the results shall meet the requirements of Table 1. 7.2 Product airbag size deviation and deformation measurement 7.2.1 Measurement of size deviation
Inflate the airbag with air or water, and when the pressure reaches the working pressure, measure it with a steel tape measure with a graduation value of 1mm, and the deviation shall meet the requirements of Table 4. 7.2.2 Measurement of elastic deformation △d
When the airbag is inflated with air or water and the pressure reaches 1.2 times of the corresponding allowable pressure in Table 3, the circumference c of the airbag is measured with a steel tape measure with a graduation of 1 mm. The elastic deformation △d of the nominal diameter of the airbag is calculated according to formula (1): Ad
Where: Ad-elastic deformation of the nominal diameter of the airbag, m; c-measured circumference of the airbag, m;
D-actual diameter of the airbag under working pressure, m. 7.3 Determination of working pressure by bursting test
7.3.1 Test airbag
CB/T.3795-1996
The nominal diameter of the airbag is 0.6m and the length of the airbag is greater than 1.8m, the material, structure type and manufacturing process are the same as the product airbag. Other diameter airbags can also be used for testing, but the length of the airbag must be greater than 3 times the diameter. The material, structure type and manufacturing process are the same as the product airbag.
7.3.2 Test temperature
10～40℃.
7.3.3 Test instrument
1.5 level pressure gauge.
7.3.4 Test method
No-load water filling blasting.
7.3.5 Determination of the average bursting pressure
7.3.5.1 Under the condition of basically the same temperature, the three test airbags are exploded. The average bursting pressure P of the test airbags is calculated according to formula (2):
P=Pi+P:+P
Where: P is the average bursting pressure of the test airbag, MPa: P1, P1, P1 are the bursting pressures of the first, second and third test airbags, MPa. 7.3.5.2 The P value should not be less than 4.5 times the corresponding working pressure value in Table 3. 7.3.5.3 Determination of airbag working pressure
The working pressure Pe of the airbag is calculated according to formula (3): D, P
Where: P. 1. Working pressure of the airbag, MPa; P-average value of burst test pressure, MPaD-diameter of the airbag body of the burst test, m; D-nominal diameter of the airbag body of the product, m; n-safety factor.
7.4 Working pressure test
The airbag is inflated without load, and the pressure reaches 1.5P. After the pressure is maintained for 10 minutes, the pressure drop should be less than 2%. 7.5 Air tightness test
Inflate the airbag to make the pressure reach P. After 1 hour, the airbag pressure should meet the requirements of Article 6.3.4. 7.6 Others
Test instruments, tools and equipment used in the test should be qualified by metrological verification, and their accuracy should be able to ensure the accuracy requirements of the measured values. 8 Inspection rules
Airbag inspection is divided into factory inspection and type inspection. The inspection items and technical requirements shall be carried out in accordance with the provisions of Table 5. Table 5 Inspection items and technical requirements
Inspection items
Dimension deviation
Elastic deformation
Air tightness
Appearance requirements
Safety valve inspection
Determination of working pressure
Working pressure inspection
Technical requirements
Factory inspection
Type inspection
CB/T3795-1996
8.2 Each product must be inspected by the technical inspection department of the manufacturer before leaving the factory, and a certificate of conformity must be issued. 8.3 Type inspection should be carried out in the following circumstances: a. Before the product is officially put into production; b. When the raw materials of the product are changed; c. When the product structure is changed; d. When the process method that affects the product performance is significantly changed; e. Every two years of production; f. When production is resumed after a 6-month shutdown; g. When the user makes a request; h. When the national quality supervision and inspection department makes a request. 9 Marking, packaging, transportation and storage 9.1 Marking 9.1.1 Each batch of gas decay should have a product certificate and use and maintenance instructions stamped by the manufacturer's technical inspection department. 9.1.2 The scope of product identification is as follows:
a. Product name;
b. Type;
c. Specification;
d. Product number;
e. Working pressure;
f. Weight;
g. Manufacturer's name;
h. Date of manufacture.
9.2 Packaging
Fold and pack with plastic woven bags. 9.3 Transportation
For short-distance transportation, the airbag should be hoisted or lifted in its natural state and rolled in its inflated state. It is strictly forbidden to drag it on the ground. For long-distance transportation, it should be padded and fixed. 9.4 Storage
9.4.1 When the airbag is not used for a long time, it should be cleaned and dried, filled inside and coated with talcum powder outside, and placed indoors in a cool, ventilated place. 9.4.2 The place where the airbag is stored should be away from heat sources. 9.4.3 The airbags should not come into contact with acids, alkalis, greases and organic solvents. 9.4.4 When not in use, the airbags should be spread out and laid flat. They should not be stacked or have heavy objects placed on them.
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