GB/T 3039-2026Fibre cement pipes and their joints (English PDF)

4.1 Classification

4.1.1 Pipes are classified into non-pressurized pipes (code WY), low-pressure pipes (code DY), and pressure pipes (code YL) according to their working pressure.

4.1.2 Unpressurized pipes are classified into three levels. Level 1, Level 2, and Level 3, according to external pressure load.

4.1.3 Low-pressure pipes are classified into Class I and Class II according to external pressure load.

4.1.4 Pressure pipes are classified into Class I, Class II, Class III, Class IV and Class V according to the working pressure of the pipeline.

4.2 Shape

4.2.1 Fiber cement pipe

The pipe is a double-joint type with machined working surfaces at both ends, as shown in Figure 1.

4.2.2 Connector

The joint is a bidirectional socket-type flexible sealing joint, as shown in Figure 2.

4.3 Specifications

4.3.1 Unpressurized tubing

The specifications and dimensions of the pressureless pipe are shown in Table 1.

4.3.2 Low-pressure pipe

The specifications and dimensions of the low-pressure pipe are shown in Table 2.

4.3.4.3 Pressure pipe fittings

The fittings used for connecting pipes are flexible fittings, which should be easy to install, have good sealing performance, and be safe to use. The specific type of fitting and the pipe socket... The specifications and dimensions are determined by the manufacturer and provided to the user along with the certificate of manufacture.

4.4 Marking

Products are marked in the order of code, grade, specification (nominal inner diameter × nominal length) and document number.

5.1 Cement

It is advisable to use silicate cement, ordinary silicate cement, sulfate-resistant silicate cement, and sulfoaluminate cement with a strength grade of not less than 42.5.

Cement. Its properties shall comply with the provisions of GB 175, GB/T 748 and GB/T 20472 respectively.

5.2 Mineral admixtures

The quality requirements for fly ash shall comply with the provisions of GB/T 1596; the quality requirements for slag powder shall comply with the provisions of GB/T 18046; silicon The quality requirements for ash shall comply with the provisions of GB/T 27690; other materials may be selected that have been tested and verified to meet the performance requirements specified in this document.

We require mineral admixtures that are harmless to the performance of the products and the quality of the transported water.

5.3 Reinforcing Fibers

5.3.1 Unbleached sulfate softwood pulp

It should comply with the provisions of GB/T 24321.

5.3.2 Polyvinyl alcohol fiber

It should comply with the provisions of GB/T 21120.

5.3.3 Other Fibers

Other materials that have been tested and verified to meet the performance requirements specified in this document and are harmless to the performance of the product and the quality of the transported water may be selected. fiber.

5.4 Water

The mixing water should conform to the requirements of JGJ63, and the recycled water that has been settled during the production process of this product can also be used.

5.5 Connector

The fitting materials used for connecting pipes shall comply with the provisions of 5.1 to 5.4, or may be selected from those that have been tested and verified to meet the requirements of this document.

Materials that meet performance requirements and are harmless to the performance of the product and the quality of the transported water.

5.6 Rubber sealing ring

The rubber sealing ring should preferably be made of natural or synthetic rubber. The rubber's mildew resistance rating should be better than level two, and its anti-aging properties should meet [standards/requirements].

The service life requirements for pipes and other performance indicators shall comply with the relevant provisions of the design or JC/T 946.

6.1 Appearance Quality

The appearance quality of pipes and fittings shall conform to the requirements of Table 6.

6.2 Dimensional Deviation

6.2.1 Pipe dimensional deviation

The dimensional deviations of the pipes shall conform to the provisions of Table 7.

6.2.2 Connector dimensional deviation

The dimensional deviations of the joints should conform to the specifications in Table 8.

6.3 Physical and Mechanical Properties

6.3.1 Physical properties

6.3.1.1 Unpressurized pipes and low-pressure pipes

The physical properties of pressureless and low-pressure pipes shall conform to the specifications in Table 9.

6.3.1.2 Pressure pipe

The physical properties of the pressure pipe shall conform to the specifications in Table 10.

6.3.2 Mechanical Properties

6.3.2.1 Unpressurized tubing

6.3.2.1.1 External pressure load

The external pressure load on the unpressurized pipe shall comply with the provisions of Table 11.

6.3.2.1.2 Bending load

The bending load of the unpressurized pipe shall comply with the provisions of Table 12.

6.3.2.2 Low-pressure pipe

6.3.2.2.1 External pressure load

The external pressure load on the low-pressure pipe shall comply with the provisions of Table 13.

6.3.2.2.2 Bending load

The bending load of low-pressure pipes shall comply with the provisions of Table 14.

6.3.2.3.4 Flexural strength

The flexural strength of the pressure pipe shall meet the requirements of Table 18.

6.3.2.3.5 External pressure strength

The external pressure strength of the pressure pipe shall meet the requirements of Table 19.

6.3.3 Connector

The performance indicators of the joint are the same as those of the matching pipe, and the sealing performance of the joint shall meet the requirements of Table 9 and Table 10 respectively.

The test methods shall be carried out in accordance with the provisions of Table 20.

8.1 Inspection Classification

Inspection is divided into factory inspection and type inspection.

8.2 Factory Inspection

8.2.1 Inspection Items

The factory inspection items shall be carried out in accordance with the provisions of Table 21.

8.2.2 Batching

It should consist of products of the same category, specification, and grade. The number of inspection batches for each specification is shown in Table 22.

8.2.3 Sampling

8.2.3.1 Appearance quality and dimensional deviations

Ten samples were randomly selected from the inspection batch for testing, and ten samples were randomly selected for retesting.

8.2.3.2 Physical and mechanical properties

Two samples were randomly selected from those that passed the appearance quality and dimensional deviation inspections. If the sample size was insufficient, the sample was divided and tested for physical and mechanical properties.

When testing samples, samples can be taken from those that have passed the inspection for appearance quality and dimensional deviation.

8.2.4 Corrosion Resistance

One sample is randomly selected from those that pass the inspection for appearance quality and dimensional deviation.

8.2.5 Determination

8.2.5.1 Appearance quality and dimensional deviations

8.2.5.1.1 Single Item Judgment

For the tested samples, all items in Category A should be qualified; if the number of unqualified items in Category B is no more than 2, then the item is considered qualified.

8.2.5.1.2 Batch Detection

The item is deemed (qualified) if all tested samples are (qualified).

If three or more of the tested samples are found to be substandard, the item is deemed unqualified.

If one or two of the tested samples are found to be non-compliant, a retest sample should be taken to retest the non-compliant items. If one sample is still found to be non-compliant... If so, the project is deemed unqualified.

8.2.5.2 Physical and Mechanical Properties

The item is deemed qualified if all physical and mechanical properties of the tested sample are qualified.

If two or more of the physical and mechanical properties of the tested sample fail to meet the requirements, the item is deemed unqualified.

If one item in the tested sample fails to meet the standard, a retest sample should be taken to retest the failed item. If the failed item still exists, the test should continue.

If the result is not satisfactory, the project is deemed unqualified.

8.2.5.3 Corrosion resistance

If the tested sample meets the requirements of 6.3.1, the item is deemed qualified; otherwise, the item is deemed unqualified.

8.2.6 Overall Judgment

If all of the above items are qualified, the batch of products is judged to be qualified; otherwise, it is judged to be unqualified.

8.3 Type Testing

8.3.1 Inspection conditions

Type testing should be conducted under any of the following circumstances.

a) During the trial production and type approval of new products or products transferred to another factory for manufacturing;

b) When there are significant changes in raw materials, mix proportions, or production processes during production;

c) When the factory inspection results differ significantly from the previous type inspection results;

d) When production resumes after a shutdown of more than six months;

e) During normal production, this should be done once every 12 months.

8.3.2 Inspection Items

Type testing items shall be carried out in accordance with the provisions of Table 21.

8.3.3 Batching

Each batch should consist of pipes or fittings of the same type, specification, and load rating. The size and sampling quantity of each inspection batch shall be in accordance with the specifications in Table 22. It will proceed as scheduled.

8.3.4 Sampling

8.3.4.1 Appearance quality and dimensional deviations

Sampling shall be conducted according to the specifications in Table 23, based on the quantity of each batch of products.

8.3.4.2 Physical and Mechanical Properties

Two samples were randomly selected from those that passed the appearance quality and dimensional deviation inspection.

8.3.5 Judgment Rules

8.3.5.1 Appearance quality and dimensional deviations

8.3.5.1.1 Single Item Judgment

If all items in category A are qualified and the number of unqualified items in category B is no more than 2, then the item is considered qualified.

8.3.5.1.2 Batch Detection

The following rules shall be followed for determination.

a) When the number of non-conforming items in the sample is less than or equal to the acceptance number Ac1 represented in column 3 of Table 23, the batch of that item is deemed non-conforming. qualified;

b) When the number of nonconforming items in a sample is greater than or equal to the rejection number Re1 represented in column 4 of Table 23, the batch of that item is deemed unacceptable. Unqualified;

c) When the number of non-conforming samples falls between the accepted and rejected numbers (columns 3 and 4 in Table 23), a second sampling should be conducted.

For the second test, take the same number of samples as the first test and retest them.

1) Add the number of nonconforming items in the first sample to the number of nonconforming items in the second sample to obtain the total number of nonconforming items;

2) When the total number of non-conforming samples is less than or equal to the acceptance number Ac2 specified in column 5 of Table 23, the batch of that item is deemed non-conforming. qualified;

3) When the total number of non-conforming samples is greater than or equal to the rejection number Re2 specified in column 6 of Table 23, the batch of that item is deemed unacceptable. Unqualified.

8.3.5.2 Physical properties

8.3.5.2.1 Impermeability, joint sealing, water absorption and frost resistance

The following rules shall be followed for determination.

a) If both test specimens in the two tested samples are qualified, the batch of this item is deemed qualified;

b) If either of the two tested samples fails, the entire batch of that item is deemed unqualified.

c) If any of the following tests fails to meet the standards. impermeability, joint sealing, water absorption, or frost resistance, the failed test should be retested. (From the same batch...)

If four additional samples are taken from the product for re-inspection, and one sample still fails to meet the standard, the entire batch of that product is deemed unqualified.

8.3.5.2.2 Corrosion Resistance

If all test specimens pass the test, the batch of the item is deemed to be qualified; otherwise, the batch of the item is deemed to be unqualified.

8.3.5.3 Mechanical Properties

The following rules shall be followed for determination.

a) When the test results of all tested samples meet the corresponding standard values, the batch of that item is deemed qualified.

b) If the test result of the inspected sample is less than 75% of the corresponding standard value, the batch of that item is deemed unqualified.

c) When the test result of the tested sample is greater than or equal to 75% but less than 100% of the corresponding standard value, it should be included in the same batch of products.

Two samples were randomly selected for re-inspection. If either of these two re-inspection samples is smaller than the corresponding standard value, the product must be tested.

If the requirement is met, then the entire batch of this project is deemed unqualified.

8.3.6 Overall Judgment

If all of the above items are qualified, the batch of products is judged to be qualified for that grade; if any one item is unqualified, the batch of products is judged to be unqualified for that grade.

9.1 Marking

The pipes and fittings should be clearly marked on the surface of the pipes and on the outer packaging at the time of manufacture, and should include at least the following information.

a) Manufacturer's name, address, and contact information;

b) Certificate number, production and manufacturing dates;

c) Product marking;

d) Product performance test results;

e) Batch number and quantity;

f) Products containing asbestos should be clearly labeled;

g) The inspection department and inspection personnel shall sign and affix their seals.

9.2 Transportation

9.2.1 Pipes should be lifted and lowered gently, and should not be lifted directly using wire ropes. During loading and unloading, pipes should not be allowed to roll freely or be thrown arbitrarily. There should be no collisions along the way.

9.2.2 To prevent damage to the pipes during transportation, both ends of the pipes can be wrapped with soft materials, or soft padding can be placed between the pipes.

9.3 Storage

Pipes should be stacked separately according to category, specification, grade and production date. The stacking site should be flat, and the number of stacking layers should comply with the provisions of Table 24.