GB 29993-2013Rubber and/or plastics hoses and hoses assemblies for domestic gas-technical requirements and testing methods (English PDF)

3.1 Hose Construction

Hose is structured as follows.

a) hose structure may be a single layer or multiple layers (including armored hose);

b) a single-layer structure hose (hose pure) black multilayer structure hose outer cover layer is orange, can also be customized.

3.2 Dimensions and tolerances

When measured according to GB/T 9573 method, unless otherwise specified, hose dimensions and tolerances shall comply with the requirements in Table 1.

Table 1 hose dimensions and tolerances

Nominal inner diameter Inner and tolerance mm Wall thickness and tolerances mm Hose with metal protection hose 9.0 9.0 ± 0.4 3.0 ± 0.3 > 1.5 9.5 9.4 ± 0.4 3.0 ± 0.3 > 1.5 13 12.7 ± 0.5 3.3 ± 0.3 > 1.8

3.3 Materials

3.3.1 hose material shall conform to the requirements specified in Table 2.

Material requirements and test methods in Table 2 project Claim Outer liner cladding layer tubing -experiment method Aging properties of 70 °C ± 1 °C, 96h Tensile strength change rate /% <= Elongation at break change rate /% <= GB/T 3512 Gas resistant performance the rate of mass change /%, <= 353 535 Appendix A

3.3.2 All samples should be intercepted on the hose, from the hose when not intercept, should use the same degree of vulcanization curing specimens tested, Selection of type 3 dumbbell specimens.

3.3.3 hose material and its intended use of the rubber, plastics and reinforcing layer material.

3.4 Appearance

Unless otherwise specified, the hose appearance quality should be consistent with the provisions of HG/T 2185's.

7.1 Packaging

7.1.1 hose coiled packaged in clear plastic bags inside the hose or other energy efficient protective packaging materials, the inner diameter of coil should Less than 15 times the inner diameter of the hose.

7.1.2 must be accompanied within each package product certification and product brochures, product instructions shall contain at least the following applies content.

a) the use of hose length should not exceed 2m, and may not have an interface; when the temporary use of hose may be less than 5m;

b) hose clamp connections should be fixed;

c) hose or hose assemblies must not pass through walls, ceilings, floors, windows and doors use;

d) the installation, the bending radius should be larger than 50mm, ban on sale, stretching, twisting, use of state under pressure;

e) should be installed below the height of the cooktop, do not close to the flame to avoid fire hose baking accelerated aging;

f) the appearance of the hose should be checked regularly and joints for leaks and replace if signs of aging in a timely manner;

g) sets GB/T 9576 stipulated storage conditions of the relevant provisions;

h) hose and use of the storage period.

7.2 Transport, storage and use

7.2.1 Transport hose and hose assemblies, storage should be consistent with GB T 9576 and GB/T requirements/9577's.

7.2.2 In line with GB/T 9576 storage conditions, storage period of not more than one year, the use of a period not exceeding three years.

Appendix A

(Normative)

Gas resistance test

When A.1 gas resistance test carried out in the hose lining layer (overcoat layer) on a selected width 10mm, length 50mm, 2mm thick specimens, with the Figure A.1 Test device shown at a test temperature of 35 °C ± 2 °C, put the sample in a purity of more than 98% of n- pentane gas saturated environment.

Holding 48h after removing dried and placed in a container of about 240mm in diameter, the holding at room temperature for about 60min. Then within 30min Measuring the quality of the sample, according to the formula (A.1) calculates the rate of mass change.

deltam =

m2-m1

100% (A.1)

Where.

deltam --- rate of mass change,%;

After m2 --- quality gas resistance test in grams (g);

Mass before m1 --- gas resistance test in grams (g).

Explanation.

1 --- sample;

2 --- drying vessel;

3 --- incubators;

4 --- bolt;

5 --- gasket;

6 --- cover;

7 --- n- pentane.

Figure A.1 gas resistance test device

Appendix B

(Normative)

Fluid resistance test B.1 hose taken from a sample of about 50mm will be liquid resistant test, carried out in accordance with the provisions of GB/T 1690, and to calculate the mass change rate. Test conditions are given in Table B.1.

Soaking samples at both ends to prevent installation of the plug to prevent the liquid soaking into the interior of the specimen.

Table B.1 fluid resistance test conditions

Pilot projects

Test conditions

Soaking solution

Test temperature

Test time

Detergent Resistance 2% n- Aqueous sodium dodecylbenzenesulfonate 25 ± 5 24h Soybean oil temperature of 155 ± 5 10s Resistance of soybean oil Resistance of 4% aqueous solution of acetic acid in vinegar Soap resistance of 2% aqueous solution of sodium dodecyl 25 ± 5 24h Appendix C (Normative) Flame test C.1 take about 250mm hose to make a sample. As shown in Fig C.1 crater inner diameter of 10mm Bunsen burner flame length about 40mm, the sample was placed horizontally in place flame tip about 10mm (about 800 °C) distance, after 5s, Bunsen burner flame goes out, Determination of the average time of sample continued to burn, take three samples represent.

Explanation.

1 --- sample;

2 --- Bunsen burner;

3 --- gas.

Figure C.1 flame test apparatus

Appendix D

(Normative)

Gas permeability test resistance D.1 Overview this annex specifies the test apparatus and test method of resistance to gas permeation test.

D.2 test device

The constant temperature water bath temperature was adjusted to 35 °C ± 0.2 °C, it is best to propane gas cylinders and piping together 4 thermostatic water tank, or the air Bottles and placed in the pipe section 35 °C ± 0.5 °C thermostatic chamber, the test device shown in Figure D.1.

Explanation.

1 --- flat-bottomed flask;

2 --- aspirator;

3 --- water manometer;

4 --- propane cylinders;

5 --- mercury manometer;

6 --- section of the door;

7 --- section of the door;

8 --- cylinder;

. 9 --- auxiliary flat-bottomed flask;

10 --- stopper;

. 11 --- sample;

12 --- section of the door;

13 --- gauge;

14 --- pressure regulator;

15 --- links section of the door;

16 --- heated water tank.

Figure D.1 resistance to gas permeation test apparatus

D.3 Test Method

Select the length of the hose 900mm made sample, plug one end with a plug, the other end of the flat-bottomed flask 1 through a glass tube stoppers (Figure D.1). Under 200kPa pressure conditions, check the joints and plugs in water or without leakage phenomenon later. Dry the surface of the sample and Other parts of the water, and then re-cork stopper and the sample on the flask 1, and you should be careful not to get off the sample.

Getter 2 is filled with a concentration of 20% salt water, water manometer 3 to inject gas saturated with distilled water. The heated water tank regulator to (35.0 ± 0.2) °C, at least after 2h, the extracted air with a vacuum pump within the sample, then supply gas with gas bottles 4 (concentration of 98% Propane), so that the internal pressure of the sample holding mercury manometer 5 60kPa, the situation in the closed section of the door 6, by a gas-permeable, water column pressure 3 level gauge will change, opening the door section 7, so that the aspirator 2 salt water flows into the cylinder 8, by this method, so that the water column pressure 3 equal level gauge.

By volume of saline cylinder 8 measurement, equal to the amount of gas from the inside volume of the sample is transmitted. 22h after the start of the test section of the door 6 is open, then close the door section 6, measured by volume, with a few milliliters per hour from the first through to the first 30h 24h within this gas 6h (ML/h) is represented.

Appendix E

(Normative)

Flexibility test

When E.1 hoses softness test by the test apparatus shown in Fig. E.1, test conditions in Table E.1 select a predetermined length of hose Sample, the sample was placed on a corresponding cylinder, at both ends of the specimen suspension tables E.1 predetermined mass objects, 1min after the measurement sample hose Contact angle of the cylinder.

Explanation.

1 --- sample;

2 --- cylinder;

3 --- hangings;

4 --- contact angle.

Figure E.1 softness test device

Table E.1 softness test conditions

Nominal inner diameter Sample length mm Diameter of the cylinder mm Pedants quality kg 9.0 400 140 1.0 9.5 400 140 1.0 13,500,180 1.5 Appendix F (Normative) Production hose type test and routine test F.1 finished hose type test and routine test items and frequency are given in Table F.1 in.

Table F.1 type test and routine test

Project type test routine test Dimensions and tolerances Diameter and tolerance × a × Wall thickness and tolerances × × Appearance × × material Aging × N/Ab Gas resistance test × N/A hose Fluid resistance test Detergent resistance × N/A High temperature oil resistance × N/A Resistance oil resistance × N/A Vinegar of resistance × N/A Resistance of soap × N/A Ozone resistance × N/A Flame test × N/A Resistance to gas permeability × N/A Tightness × × Bending property × N/A Heat resistance × N/A Softness (only for metal protection hose) × N/A Pressure resistance × × Hoses to pull off the performance of × × Low temperature flexibility × N/A

Note 1. The hose appearance, size should test by the root;

Note 2. Each 50000m products, each batch optionally one specification is represented either take two detection tightness, pressure hose and pull off the performance, lack of Batch, test once a week.

a × shows the test should be carried out;

b N/A indicates not applicable test.

Appendix G

(Informative)

Production Test

Production pilot project G.1 recommendations and batch Table G.1.

Table G.1 production test

Project batch test a periodic test b Dimensions and tolerances Diameter and tolerance × c × Wall thickness and tolerances × × Appearance × × material Aging N/Ad × Gas resistance test N/A × hose Fluid resistance test Detergent Resistance N/A × Oil of high temperature N/A × Resistance to oil resistance N/A × Vinegar resistance of N/A × Soap resistance of N/A × Ozone resistance N/A × Flame test N/A × Resistance to gas permeation performance N/A × Tightness × × Bending Properties N/A × Heat resistance N/A × Softness (only for metal protection hose) N/A × Pressure resistance × × Hoses to pull off the performance of × × Low temperature flexibility N/A × a specification of each product per 50000m test a sample;

b specifications of each product every 12 months, three test samples;

c × shows the test should be carried out;

d N/A indicates not applicable test.

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