GB/T 39385-2020Plastics piping and ducting systems. Thermoplastics pipes. Determination of ring flexibility (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard uses the translation method equivalent to ISO 13968.2008 "Plastic Piping System Thermoplastic Pipe Ring Flexibility Determination".

The Chinese documents that have a consistent correspondence with the international documents cited in this standard are as follows.

---GB/T 9647-2015 Thermoplastic pipe ring stiffness determination (ISO 9969.2007, IDT)

Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.

This standard was proposed by the China National Light Industry Council.

This standard is under the jurisdiction of the National Standardization Technical Committee for Plastic Products (SAC/TC48).

Drafting organizations of this standard. Beijing Building Materials Inspection and Research Institute Co., Ltd. (National Water-saving Appliance Product Quality Supervision and Inspection Center), China University

Plastic Products Co., Ltd., Zhejiang Zhongcai Pipeline Technology Co., Ltd., Yonggao Co., Ltd., Chengdu Chuanlu Plastic Group Co., Ltd.

Company, Zhejiang Weixing New Building Materials Co., Ltd., Baoding Lida Plastic Industry Co., Ltd., Beijing Technology and Business University (Light Industry Plastics Processing Application Research

Research Institute), Shanghai Baidie Pipe Industry Technology Co., Ltd., Hebei Yourong Pipe Industry Co., Ltd., National Chemical Building Materials Testing Center (material testing

Test Department), Hangzhou Unicom Pipe Industry Co., Ltd., Sichuan Senpu Pipe Co., Ltd., Tianjin Tianyou Architectural Design Co., Ltd., Chengde

City Precision Testing Machine Co., Ltd.

1 Scope

This standard specifies a test method for the flexibility of a ring-shaped cross-section thermoplastic pipe ring.

This standard is applicable to the determination of the deformation and force value when the pipe reaches the specified radial deformation or breaks within the specified radial deformation range.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.

For undated references, the latest version (including all amendments) applies to this document.

ISO 9969 Thermoplastic pipe ring stiffness determination

3 Terms and definitions

The following terms and definitions apply to this document.

3.1

Ring flexibility

On the basis of maintaining the integrity of the pipe structure, the ability of the pipe to withstand radial deformation.

[EN13476-1.2007]

4 Principle

At a constant rate, the annular cross-section of the pipe is deformed in the diameter direction until it reaches the specified amount of deformation or breaks.

Measure the force value and the amount of deformation at this time to determine the ring flexibility of the pipe.

During the test, monitor the state of the sample and check whether the sample has specified mechanical damage.

Note. The following test parameters can be given by relevant standards.

a) When appropriate, samples with a length greater than that specified in ISO 9969 can also be selected, see Chapter 6;

b) Deformation, as appropriate, see 8.1.

5 equipment