JT/T 1283.3-2019Inflatable buoyancy hovercraft--Part 3: Buoyancy skirt of hovercraft (English PDF)

Foreword

JT/T 1283 "Full cushion airbag floating body hovercraft" is divided into 3 parts.

--- Part 1. Side airbag hovercraft;

--- Part 2. Surrounding airbag hovercraft;

--- Part 3. Hovercraft airbag.

This section is part 3 of JT/T 1283-2019.

This section is in accordance with GB/T Draft the rules given in 1-2009.

Please note that some content in this section may involve patents, and the issuing authority of this standard does not assume responsibility for identifying these patents.

This part is proposed and managed by the National Inland Waterway Standardization Technical Committee (SAC/TC 130).

Introduction

In order to adapt to the application and development of full-cushion hovercrafts that use airbags as floating bodies, to meet China's transportation, tourism, leisure and entertainment, business, Increasing demand in areas such as flood relief, emergency rescue, etc., to ensure the safety of full-lift airbag floating body hovercraft, this part of the standard is formulated.

The hovercraft airbag is the main buoyant body and important flexible hull structure of the full-lift airbag buoyant hovercraft. It can also be used as a stand-alone product.

This section provides technical basis for the production, inspection, use, and maintenance of airbag products.

JT/T 1283. 3-2019

Full cushion airbag floating body hovercraft Part 3. Hovercraft airbags

1 Scope

This part of JT/T 1283 specifies the technical requirements, test methods, inspection rules, and marking, packaging, transportation and Storage requirements.

This section applies to the production, inspection and use of full-lift airbag floating body air-cushion airbags made of plastic or rubber-coated fabric. side the first and second air seals of the wall airbag hovercraft and the airbag fingers of the side wall airbag hovercraft and the wall airbag hovercraft can be referred to.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document.

GB/T 7530 Terminology of rubber or plastic coated fabrics GB/T 18426 Low temperature bending test of rubber or plastic coated fabric GB/T 24135 Accelerated aging test of rubber or plastic coated fabric CB/T 3387 Rubber-coated fabric for aprons of small hovercraft HG/T 2580 Determination of tensile strength and elongation at break of rubber or plastic coated fabrics HG/T 2581. 1-2009 Determination of tear resistance of rubber or plastic-coated fabrics. Part 1. Constant-speed tearing method HG/T 3050. 3 Determination of the roll characteristics of rubber or plastic coated fabrics. Part 3. Method for determining thickness HG/T 3052 Determination of adhesive strength of rubber or plastic-coated fabric coatings JT/T 1283. 1-2019 Full-height airbag floating body hovercraft Part 1. Side airbag hovercraft JT/T 1283. 2-1919 Full-height airbag floating body hovercraft Part 2. Wall airbag hovercraft

3 Terms and definitions

The terms and definitions established in GB/T 7530 and the following apply to this document. For ease of use, GB/T is repeatedly listed below Some terms and definitions in 7530.

Rubber-coated fabrics Fabric coated or covered with rubber material.

[GB/T 7530-1998, definition 3. 1. 2] 3. 2 Plastic-coated fabrics Fabric coated or covered with plastic material.

[GB/T 7530-1998, definition 3. 1. 3] JT/T 1283. 3-2019

4 Technical requirements

4.1 General requirements

4.1.1 The appearance of the airbag should be uniform, the color and luster should be uniform, and there should be no defects affecting quality such as opening glue, separation, wrinkles, etc. The surface of the tape should be flat, smooth.

4.1.2 The diameter and length tolerances of the airbag should be positive tolerances. The diameter tolerance is generally not greater than 5% of the airbag diameter.

2% of the airbag length. The dimensional tolerances of the airbag shall meet the requirements of the design drawings.

4.1.3 Airbags are divided into two types according to their functions. One is a constant pressure airbag. The constant pressure airbag generally consists of multiple independent air chambers.

One is a pressure-adjustable airbag, which is generally composed of a single air chamber.

4.1.4 The color of the airbag depends on the requirements of the customer. The rubber-coated fabric airbag is generally black.

4.2 Strength and density

4.2.1 The working pressure of the airbag is generally not more than 16kPa.

4.2.2 The airbag should be able to withstand 3 times the working pressure. At 3 times the working pressure, the pressure drop for 30 minutes is not more than 5%.

Cracks or other defects.

4.2.3 The air chamber of the airbag shall be sufficiently airtight. Park for 1 hour under working pressure. After compensation for temperature and atmospheric pressure changes, the pressure drop should not exceed 5%.

4.3 airbag valve

4.3.1 The performance of the airbag valve should meet JT/T 1283. 2-2019 5. 3. 5 requirements.

4.3.2 The installation opening of the airbag valve should be reinforced with main tape.

4.4 Airbag connector

4.4.1 Airbag connection is divided into airbag and rigid hull connection, airbag and airbag connection, airbag and head and tail gas seal connection and air the connection of the bladder to the airbag fingers.

4.4.2 The material of the airbag connector shall have anti-corrosion ability suitable for the use environment, anti-corrosion and anti-aging ability to oil, acid, etc.

4.4.3 The connection strength of the airbag connector shall be at least equivalent to the tensile strength of the body material of the airbag.

4.4.4 The structure and installation of the airbag connector of the side airbag hovercraft shall meet JT/T 1283. 1-2019 5. 2. 3. 5 requirements. Encircle the structure and installation of wall airbag hovercraft airbag connectors should meet JT/T 1283. 2-2019 5. 2. 3. 6 requirements.

4.5 Materials

4.5.1 Material classification Airbag body materials generally use plastic-coated fabrics and rubber-coated fabrics. Plastic coated fabrics are divided into thermoplastic polyvinyl chloride (PVC) Coated fabrics and thermoplastic elastomer polyurethane (TPU) coated fabrics. The type of rubber-coated fabric shall comply with the provisions of CB/T 3387.

4.5.2 Material physical properties 4. 5. 2. 1. The physical properties of thermoplastic polyvinyl chloride (PVC) coated fabrics shall meet the requirements of Table 1.

JT/T 1283. 3-2019

Table 1 Physical properties of thermoplastic polyvinyl chloride (PVC) coated fabrics

Project indicators

Tensile strength (N/5cm) Warp >= 2 800 Weft >=2 500 Elongation at break(% ) Warp <=35 Weft <=35 Tear strength (trapezoidal method) (N) Warp direction >=200 Coating adhesion (N/5cm) >=100 Hot air aging performance (70 ° C × 168h) no cracking, peeling or hardening in appearance Tensile strength retention (%) >=90 Cold resistance.-30 ° C × 4h, 180 ° bending, no crack under double magnifier Thickness (mm) 9 ± 0. 05, special requirements will be determined separately

4.5.2.2 The physical properties of thermoplastic elastomer polyurethane (TPU) coated fabrics shall meet the requirements of Table 2.

Table 2 Physical properties of thermoplastic elastomer polyurethane (TPU) coated fabrics

Project indicators

Tensile strength (N/5cm) Warp >= 3 500 Weft >=3 500 Elongation at break(% ) Warp <=35 Weft <=45 Tear strength (trapezoidal method) (N) Warp direction >=150 Coating adhesion (N/5cm) >=100 Hot air aging performance (70 ° C × 168h) no cracking, peeling or hardening in appearance Tensile strength retention (%) >=90 Cold resistance.-50 ° C × 4h, 180 ° bending, no cracks under double magnifier Thickness (mm) 0 ± 0. 05, special requirements will be determined separately

4.5.2.3 The physical properties of rubber-coated fabrics shall meet the requirements in Table 3.

Table 3 Physical properties of rubber-coated fabrics

Project indicators

Tensile strength (N/5cm) Warp >= 2 500 Weft >=2 500 Elongation at break(% ) Warp <=35 Weft <=35 Tear strength (trapezoidal method) (N) Warp direction >=200 JT/T 1283. 3-2019

Table 3 (continued)

Project indicators

Coating adhesion (N/5cm) >=100 Hot air aging performance (70 ° C × 168h) no cracking, peeling or hardening in appearance Tensile strength retention (%) >=90 Cold resistance.-30 ° C × 4h, 180 ° bending, no crack under double magnifier Thickness (mm) 0 ± 0. 05, special requirements will be determined separately

4.5.2.4 If other materials are used, their physical properties should be able to ensure that the manufactured airbag meets 4. 2 requirements.

4.5.3 Material appearance requirements Airbag body material coated fabrics must not have defects such as fabric breakage, delamination, lack of glue, and mechanical damage.

5 Test method

5.1 Visual inspection Inflate the airbag to working pressure, and then visually check the appearance quality of the airbag.

5.2 Dimension inspection Inflate the airbag to working pressure, and then use special tools to measure the diameter and length of the airbag and the dimensions of the airbag.

5.3 strength test

After inflating each air chamber of the airbag to 3 times the working pressure and stopping for 15min ± 1min, if the internal pressure of the airbag expands and the internal pressure drops, replenish the air 3 times the working pressure and then park for 30 minutes.

5.4 Tightness test

Inflate the airbag to working pressure with compressed air. After parking for 15min ± 1min, inflate the air to the specified pressure, and start recording time, temperature Degree, pressure, and record time, temperature and residual pressure after parking for 60min ± 1min. During the test, the temperature of the airbag rises or decreases by 1 ° C.

The pressure decreases or increases accordingly. 4kPa as compensation; every rise or fall in atmospheric pressure. 1kPa, the airbag pressure decreases or increases by 0. 1kPa as make up.

5.5 airbag valve test Airbag valves are inspected visually and tested for effectiveness.

5.6 airbag connector test the connection strength of the airbag connector is tested for tensile strength according to HG/T 2580.

5.7 Material test

5.7.1 The tensile strength is tested in accordance with HG/T 2580.

5.7.2 The elongation at break is tested according to HG/T 2580.

5.7.3 Tear resistance according to HG/T 2581. Test in method 1-2009 for trapezoidal specimen tearing method.

JT/T 1283. 3-2019

5.7.4 The adhesive strength of the coating is tested in accordance with HG/T 3052.

5.7.5 Heat-resistant air aging performance test.

a) Appearance is measured according to GB/T 24135;

b) The tensile strength retention rate shall be tested in accordance with GB/T 24135 and HG/T 2580.

5.7.6 Cold resistance is measured according to GB/T 18426.

5.7.7 Thickness according to HG/T 3050. 3 Take the measurement.

5.7.8 The appearance of materials shall be checked visually.

6 Inspection rules

6.1 Inspection classification

6.1.1 Airbag inspection is divided into type inspection and factory inspection.

6.1.2 Type inspection is applicable to manufacturers or suppliers, inspection or appraisal agencies. Factory inspection applies to manufacturers or suppliers, users or Orderer, inspection or appraisal agency.

6.1.3 Type inspection Type inspection should be carried out in one of the following situations.

a) Stereotype identification of new or old products transferred to the factory;

b) After the official production, if there are major changes in structure, materials and processes that may affect product performance, or every 4 years;

c) When the product is suspended for a long time, when it resumes production;

d) When the inspection and supervision agency puts forward the requirements for type inspection.

6.1.4 Factory inspection the manufactured airbag should be inspected at the factory. A batch of airbags produced in batches is not more than 10 hulls.

1,000m is submitted for acceptance in a batch.

6.2 Inspection items the type inspection and factory inspection items of the airbag shall be carried out in accordance with the regulations in Table 4.

Table 4 Inspection items

Technical requirements for test items Test methods Type inspection Factory inspection

1 Appearance 1. 1 5. 1 sqrt sqrt

2 Dimensions 4. 1. 2 5. 2 sqrt sqrt

3 Intensity 4. 2. 2 5. 3 sqrt -4 tightness 2. 3 5. 4 sqrt sqrt

5 Valves 4. 3 5. 5 sqrt sqrt

6 Connections 4. 4. 3 5. 6 sqrt-Coated fabric Tensile strength 5. 2 5. 7. 1 sqrt delta Elongation at break 5. 2 5. 7. 2 sqrt delta Tear resistance 5. 2 5. 7. 3 sqrt delta JT/T 1283. 3-2019

Table 4 (continued)

Technical requirements for test items Test methods Type inspection Factory inspection Coated fabric Coating adhesion strength 4. 5. 2 5. 7. 4 sqrt delta 3. Heat-resistant air aging performance 5. 2 5. 7. 5 sqrt-Cold resistance4. 5. 2 5. 7. 6 sqrt-Thickness 4. 5. 2 5. 7. 7 sqrt-Note. sqrt indicates inspection items,-indicates non-inspection items, delta indicates one inspection per batch, and - indicates 30% inspection.

6.3 Judgment rules

6.3.1 Type inspection. If one item fails, the type inspection fails.

6.3.2 The factory inspection and judgment rules are as follows.

a) 30% of the products are tested by batch. If there are any unqualified products, they will be eliminated; then the strength test will be changed one by one.

Yes, the products with unqualified strength shall be rejected; measures shall be taken for the rejected products, and the inspection shall be submitted again;

b) Appearance, size and tightness shall be inspected at 100%, and unqualified products shall be eliminated; measures shall be taken for the rejected products, and then re-examined.

Submit for acceptance

c) The coated fabric shall be carried out in batches. If one item fails, a double sample shall be taken for re-inspection of the item.

The product fails.

7 Marking, packaging, transportation and storage

7.1 Sign

The product should be marked with.

a) the manufacturer's name or trademark;

b) factory number;

c) date of manufacture.

7.2 Packaging

7.2.1 The complete set of products that have passed the inspection are folded and packed in accordance with the requirements, with a certificate of compliance and an instruction manual. Folded Packaged Product Repack into a cardboard box for packing.

7.2.2 The certificate shall indicate.

a) product name;

b) the name of the manufacturer;

c) factory number;

d) the date of manufacture;

e) specifications or dimensions;

f) working pressure;

g) the number of the standard being met;

h) The seal of the manufacturer's quality supervision department.

7.3 Transportation

The product should be gently lifted and transported during transportation, and the stack height should not exceed four layers. It is strictly forbidden to contact with sharp objects.

JT/T 1283. 3-2019

7.4 Storage

7. 4. 1. The finished airbag should be stored in a warehouse with a temperature of -10 ° C to 35 ° C and a relative humidity of not more than 80%.

Direct sunlight, avoid contact with substances that damage the coated fabric, such as acids, alkalis and oils in the environment. The height of the storage position above the ground should not be lower than 10cm, stacked flat, no more than four layers high.

7.4.2 In the storage state, the airbag should be regularly maintained, inflated once every 6 months, and dried.

JT/T 1283. 3-2019