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GB/T 18252-2020 English PDF

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GB/T 18252-2020: (Plastic piping systems Use extrapolation to determine the long-term hydrostatic strength of thermoplastic materials in the form of pipes)
Status: Valid

GB/T 18252: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 18252-2020English579 Add to Cart 6 days [Need to translate] (Plastic piping systems Use extrapolation to determine the long-term hydrostatic strength of thermoplastic materials in the form of pipes) Valid GB/T 18252-2020
GB/T 18252-2008English954 Add to Cart 4 days [Need to translate] Plastics piping and ducting systems -- Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation Obsolete GB/T 18252-2008
GB/T 18252-2000English759 Add to Cart 5 days [Need to translate] Plastics piping and ducting systems--Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation Obsolete GB/T 18252-2000

PDF similar to GB/T 18252-2020


Standard similar to GB/T 18252-2020

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Basic data

Standard ID GB/T 18252-2020 (GB/T18252-2020)
Description (Translated English) (Plastic piping systems Use extrapolation to determine the long-term hydrostatic strength of thermoplastic materials in the form of pipes)
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G33
Word Count Estimation 31,390
Date of Issue 2020-11-19
Date of Implementation 2021-06-01
Older Standard (superseded by this standard) GB/T 18252-2008
Regulation (derived from) National Standard Announcement No. 26 of 2020
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 18252-2008: Plastics piping and ducting systems -- Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Plastics piping and ducting systems. Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation ICS 83.140.30 G33 National Standards of People's Republic of China GB/T 18252-2008/ISO 9080.2003 Replacing GB/T 18252-2000 Plastics piping systems determined by extrapolation of the thermoplastic Plastic pipe material in the form of long-term hydrostatic strength (ISO 9080.2003, IDT) Posted 2008-08-19 2009-05-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Preface Ⅰ Introduction Ⅱ 1 Scope 1 2 Normative references 1 3 Terms and definitions Experimental data obtained 4 2 5 Step 3 6 verify a partially crystalline polymer sample calculation and software 5 7 Test Report 6 Collection and analysis methods in Appendix A (normative) data 7 Appendix B (normative) inflection automatic inspection 11 Examples Appendix C (informative) Application of SEM analysis of stress damage data 12 Appendix D (Informative Appendix) SEM software information 18 References 19 GB/T 18252-2008/ISO 9080.2003

Foreword

This standard is identical with ISO 9080.2003 "Plastics piping systems determine thermoplastic materials in pipe form by extrapolation length Hydrostatic Strength. " This standard replaces GB/T 18252-2000 "Plastics piping systems by extrapolation of thermoplastic pipe long-term hydrostatic strength Determination. " This standard and GB/T 18252-2000 compared to the main changes are as follows. --- Standard name from "Plastics piping systems by extrapolation of thermoplastics pipes - Determination of long-term hydrostatic strength" to "plastic Thermoplastics piping systems to determine pipe material in the form of long-term hydrostatic strength "by extrapolation; --- This standard failure mode is divided into A and B, to determine the failure mode with automatic inflection point test. GB/T 18252-2000 Ductile failure mode into the destruction and brittle, the first observation with the naked eye to determine the failure mode, the naked eye is difficult to determine Failure mode when using automatic inspection method to determine the inflection point; --- This standard is defined as a row vector x0, appears in the formula (A.12) matrix product terms as [x0 (XTX) -1 x0 T], the amount GB/T 18252-2000 defined as a column vector; --- Calculated σLTHS two formulas. This standard canceled the GB/T 18252-2000 calculated σLTHS formula (A.13) and Formula (A.14); When seeking σLPL screening method --- Efficient Solutions. The standard formula (A.13) before the radical just take minus. GB/T 18252-2000 appropriate (A.15) (±) number before the radical formula. α> 0, the root of the former negative sign, α < 0, the root before taking a positive sign; --- The Standard A. 4 shows the fit test method, GB/T 18252-2000 did not give a fit test. This standard Annex A, Annex B is normative appendix, Appendix C, Appendix D is an informative annex. The standard proposed by China National Light Industry Council. This standard by the National Plastics Standardization Technical Committee of plastic pipe, fittings and valves at the Technical Committee (TC48/SC3) Centralized. This standard was drafted. Sichuan University, Institute of Applied processing plastic Beijing Technology and Business University of Light Industry, China Petroleum & Chemical Corporation SECRETARY Qilu Company Institute, Georg Fischer Piping Systems Limited. The main drafters of this standard. Hyo Dong Li, Zhao Qihui, Xiejian Ling, Li Peng. This standard replaces the standards previously issued as follows. --- GB/T 18252-2000. GB/T 18252-2008/ISO 9080.2003

Introduction

Plastic materials mechanical damage and temperature, the size of the load and under load duration. Proper use of plastic pressure pipes considering the temperature Polyethylene pressure pipes usually takes decades or even 100 years of long life. This standard pipes with a high temperature in a short time (still It takes one year) of the pipe material under hydrostatic stress for decades or even 100 years time damage to extrapolate the test results hydrostatic stress tolerance ability. Normal distribution. On this basis, calculated according to the following order. a) Multiple linear regression; The relationship between the four variables. The most common application is to solve the following two questions. Below the upper limit of the stress should be under the control of ε forecast. Usually take ε = 0.975, corresponding stress σLPL. σLPL the pipe Products allowable stress allowable pressure, the design basis pressure rating and wall thickness. Some previous ISO standards, had used symbols σLCL to represent the same physical quantity. Because of the need for international trade, this standard definition of static hydraulic strength of their σLTHS and σLPL in ISO 9080.2003 definition of straight Translation given. GB/T 18252-2008/ISO 9080.2003 Plastics piping systems determined by extrapolation of the thermoplastic Plastic pipe material in the form of long-term hydrostatic strength

1 Scope

This standard describes the long-term hydrostatic strength of thermoplastics material by an estimated one kind of statistical extrapolation. This standard applies to all kinds of thermoplastic pipe materials under its applicable temperature. The method is based upon test data based on the pipe on. Pipe size used in the test can be defined and recorded in the test report on the product or system standards.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 6111 Standard Test Method for conveying fluid pressure within the thermoplastic pipe (GB/T 6111-2003, ISO 1167.1996, IDT) GB/T 8802-2001 Thermoplastics pipes, fittings Vicat softening temperature measured (eqv ISO 2507.1995) GB/T 8806 plastic pipe size measurement method (GB/T 8806-2008, ISO 3126.2005, IDT) GB/T 19466.3-2004 plastic differential scanning calorimetry (DSC) - Part 3. melting and crystallization temperature and enthalpy determination (ISO 11357-3.1999, IDT)

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 The force exerted on the media unit area of \u200b\u200bthe inner tube, in megapascals (MPa). 3.2 Force of the internal pressure in the pipe wall is directed toward the hoop (circumferential direction) of the unit area, in megapascals (MPa). Using the following simplified formula is calculated from the internal compressive stress σ. (1) Where. 3.3 Tt Determination of stress damage data used in temperature, in degrees Celsius (℃). GB/T 18252-2008/ISO 9080.2003

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