《BS EN 705-1995 Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes and.pdf》由会员分享，可在线阅读，更多相关《BS EN 705-1995 Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes and.pdf（36页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 705:1995 BS 2782-12: Methods 1220A to C: 1995 Plastics piping systems Glass-reinforced thermosetting plastics (GRP) pipes and fittings Methods for regression analyses and their use The European Standard EN 705:1994 has the status of a British Standard BS EN 705:1995 This Briti
2、sh Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 November 1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference
3、PRI/61 Draft for comment 92/41338 DC ISBN 0 580 24136 X Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/61, Plastics piping systems and components, upon which the following bodies were represented: British Gas plc Bri
4、tish Plastics Federation British Plumbing Fittings Manufacturers Association British Valve and Actuator Manufacturers Association Department of the Environment (British Board of Agrment) Department of the Environment (Building Research Establishment) Department of the Environment (Property and Build
5、ings Directorate) Department of Transport Electricity Association Federation of Civil Engineering Contractors Health and Safety Executive Institute of Building Control Institute of Materials Institution of Civil Engineers Institution of Gas Engineers Institution of Water and Environmental Management
6、 National Association of Plumbing, Heating and Mechanical Services Contractors Pipeline Industries Guild Plastics Land Drainage Manufacturers Association Society of British Gas Industries Society of British Water Industries Water Companies Association Water Services Association of England and Wales
7、Amendments issued since publication Amd. No.DateComments BS EN 705:1995 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 7055 BS EN 705:1995 ii BSI 01-2000 National foreword This British Standard has been prepared by Technical Committee PRI
8、/61, and is the English language version of EN 705:1994 Plastics piping systems Glass-reinforced thermosetting plastics (GRP) pipes and fittings Methods for regression analyses and their use, published by the European Committee for Standardization (CEN). It is incorporated into BS 2782 Methods of te
9、sting plastics Part 12. Reinforced plastics pipes, fittings and valves, as Methods 1220A to C:1995 as follows. Method 1220A corresponds to method A (Covariance method) of EN 705:1994. Method 1220B corresponds to method B (Regression with time as the independent variable) of EN 705:1994. Method 1220C
10、 corresponds to method C (Second order polynomial relationships) of EN 705:1994. These methods are incorporated into BS 2782 for association with related test methods for plastics materials and plastics piping components. This test method has been prepared for reference by other standards under prep
11、aration by CEN for specification of reinforced plastics piping systems and components. It has been implemented as a national standard to enable experience of the method to be gained and for use for other fresh applications. It is also for use for the revision or amendment of other national standards
12、 as practicable, but it should not be presumed to apply to any existing standard or specification which contains or makes reference to a different method until that standard/specification has been amended or revised to make reference to this method and adjust any requirements as appropriate. A Briti
13、sh Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front
14、 cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 31 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. ? EUROPEAN STANDARD NORME EUROPENNE
15、 EUROPISCHE NORM EN 705 April 1994 UDC 621.643.2-036.067.5:621.643.06:620.1:519.2 Descriptors: Pipelines, plastic tubes, pipe fittings, thermosetting resins, reinforced plastics, glass, data, statistical analysis, computation, design inspection English version Plastics piping systems Glass-reinforce
16、d thermosetting plastics (GRP) pipes and fittings Methods for regression analyses and their use Systmes de canalisations plastiques Tubes et raccords plastiques thermodurcissable renforcs de verre (PRV) Mthodes pour une analyse de rgression et leurs utilisations Kunststoff-Rohrleitungssysteme Rohre
17、und Formstcke aus glasfaserverstrkten duroplastischen Kunststoffen (GFK) Verfahren zur Regressionsanalyse und deren Anwendung This European Standard was approved by CEN on 1994-04-11. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving
18、this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions
19、 (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denm
20、ark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36,
21、B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 705:1994 E ? EN 705:1994 BSI 01-2000 2 Foreword This standard was prepared by CEN/TC 155, Plastics piping systems and ducting systems. This standard is based on document N 197 Glass-reinforced thermosetting plastics (GRP) pipes and f
22、ittings Standard extrapolation procedures and their use, prepared by working group 1 of Subcommittee 6 of Technical Committee 138 of the International Organization for Standardization (ISO). It is a modification of ISO/TC 138/SC6/WG 1 N 197 for reasons of possible applicability to other test conditi
23、ons and alignment with texts of other standards on test methods. The modifications are: examples have been introduced to enable validation of alternative calculation facilities; material-dependent requirements are not given; editorial changes have been introduced. The material-dependent test paramet
24、ers and/or performance requirements are incorporated in the referring standard. Annex A, which is informative, describes procedures for solving the given set of equations (see 3.2.3) on a mathematical basis using the example shown in 3.2.6. No existing European Standard is superseded by this standar
25、d. This standard is one of a series of standards on test methods which support System Standards for plastics piping systems and ducting systems. This standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 1994
26、, and conflicting national standards shall be withdrawn at the latest by October 1994. In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Italy, Luxembou
27、rg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Contents Page Foreword2 Introduction5 1Scope5 2Principle5 3Procedures for determining the functional relationships5 3.1Linear relationships Methods A and B5 3.2Second order polynomial relationships Method C14 4Application
28、 of methods to product design and testing16 4.1General16 4.2Design17 4.3Examples for validation of calculation procedures for design20 4.4Procedures for verifying conformance to product design and performance values23 4.5Examples for validation of calculation procedures for design or product perform
29、ance verification26 Annex A (informative) Mathematical procedures30 A.1Matrix system30 A.2Substitution system30 Figure 1 Regression line from the results in Table 411 Figure 2 Regression line from the results in Table 716 Figure 3 Derived values18 Figure 4 Extrapolated values19 Figure 5 Example on p
30、ressure21 Figure 6 Example for ring stiffness24 Figure 7 Property test values25 Table 1 Minimum values for the squared, r2, and linear coefficient of correlation, r, for acceptable data from n pairs of data7 Table 2 Percentage points of Student s t distribution (upper 2,5 % points; two sided 5 % lev
31、el of confidence; tv for 97,5 %)8 Table 3 Basic data for example calculation and statistical analysis validation10 Table 4 Estimated mean values, Vm, for V11 Table 5 Basic data for example calculation and statistical validation13 ? EN 705:1994 BSI 01-20003 Page Table 6 Estimated mean values, Vm, for
32、 V13 Table 7 Estimated mean values, Vm, for V16 Table 8 Initial burst test results20 Table 9 Initial ring stiffness test results22 Table 10 Initial burst test failure pressures for the sample26 Table 11 Times to failure of burst tests of the sample27 Table 12 Initial ring stiffness results for the s
33、ample28 Table 13 Stiffness results at 1 000 h for the sample28 ? 4 blank ? EN 705:1994 BSI 01-20005 Introduction This standard has been prepared to describe the procedures intended for analysing the regression of test data, usually with respect to time, and the use of the results in design and asses
34、sment of conformity with performance requirements. Its applicability has been limited to use with data obtained from tests carried out on samples. The referring standards require estimates to be made of the long-term properties of the pipe for such parameters as circumferential tensile strength, def
35、lection and creep. The committee investigated a range of statistical techniques that could be used to analyse the test data produced by tests that were destructive. Many of these simple techniques required the logarithms of the data to a) be normally distributed; b) produce a regression line having
36、a negative slope; and c) have a sufficiently high regression correlation (see Table 1). Whilst the last two conditions can be satisfied, analysis has shown that there is a skew to the distribution and hence this primary condition is not satisfied. Further investigation into techniques that can handl
37、e skewed distributions resulted in the adoption of the covariance method for analysis of such data for this standard. The results from non-destructive tests, such as creep or changes in deflection with time, often satisfy these three conditions and hence simpler procedures, using time as the indepen
38、dent variable, can also be used in accordance with this standard. 1 Scope This standard specifies procedures suitable for the analysis of data which, when converted into logarithms of the values, have either a normal or a skewed distribution. It is intended for use with the test methods and referrin
39、g standards for glass-reinforced plastics pipes or fittings for the analysis of properties as a function of, usually, time. However it can be used for the analysis of any other data. For use depending upon the nature of the data, three methods are specified. The extrapolation using these techniques
40、typically extends the trend from data gathered over a period of approximately 10 000 h, to a prediction of the property at 50 years. 2 Principle Data are analysed for regression using methods based on least squares analysis which can accommodate the incidence of a skew and/or a normal distribution a
41、nd the applicability of a first order or a second order polynomial relationship. The three methods of analysis used comprise the following: method A: covariance using a first order relationship; method B: least squares with time as the independent variable using a first order relationship; method C:
42、 least squares with time as the independent variable using a second order relationship. The methods include statistical tests for the correlation of the data and the suitability for extrapolation. 3 Procedures for determining the functional relationships 3.1 Linear relationships Methods A and B 3.1.
43、1 Procedures common to methods A and B Use method A (see 3.1.2) or method B (see 3.1.3) to fit a straight line of the form where y = a + bx(1) y is the logarithm (lg) of the property being investigated; a is the intercept on the y axis; b is the slope; x is the logarithm (lg) of the time, in hours.
44、? EN 705:1994 6 BSI 01-2000 3.1.2 Method A Covariance method 3.1.2.1 General For method A calculate the following variables as necessary in accordance with 3.1.2.2 to 3.1.2.5: where NOTEIf the value of Qxy is greater than zero the slope of the line is positive and if the value of Qxy is less than ze
45、ro then the slope is negative. 3.1.2.2 Suitability of data Calculate the squared, r2, and the linear coefficient of correlation, r, using the following equations: If the value of r2 or r is less than the applicable minimum value given in Table 1 as a function of n, consider the data unsuitable for a
46、nalysis. 3.1.2.3 Functional relationships To find a and b for the functional relationship line first set then calculate a and b using the following equations: 3.1.2.4 Calculation of variances If tu is the applicable time to failure, then set Using equations (11), (12) and (13) respectively, calculat
47、e for i = 1 to n the following sequence of statistics: the best fit xi for true xi; the best fit yi for true yi; and (2) (3) (4) Qyis the sum of the squared residuals parallel to the y axis divided by n; Qxis the sum of the squared residuals parallel to the x axis divided by n; Qxyis the sum of the
48、squared residuals perpendicular to the line, divided by n; Yis the arithmetic mean of the y data, i.e. Xis the arithmetic mean of the x data, i.e. xi, yi, are individual values; nis the total number of results (pairs of readings for xi, yi). (5) (6) y = a + bx(1) (7) b = ()0,5(8) a = Y bX(9) xu lg t
49、u(10) EN 705:1994 BSI 01-20007 the error variance, 2 for x. Calculate the following quantities: Calculate the variance C of the slope b using the following equation: Table 1 Minimum values for the squared, r2, and linear coefficient of correlation, r, for acceptable data from n pairs of data 3.1.2.5 Check for the suitability of data for extrapolation If it is intended to extrapolate the