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1、BRITISH STANDARD BS 2782-11: Method 1101A:1981 Methods of testing Plastics Part 11: Thermoplastics pipes, fittings and valves Method 1101A: Measurement of dimensions of pipes IMPORTANT NOTE. Before reading this method it is essential to read the foreword, general introduction and instructions to BS
2、2782, issued separately. UDC 678.5/.8:678.01:678.073:621.643.2:531.717.1 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:58:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-11:Method 1101A:1981 This British Standard, having been prepared under the direct
3、ion of the Plastics Standards Committee, was published under the authority of the Executive Board and comes into effect on 27 February 1981 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference PLC/9 Draft for comment 78/55598 DC ISBN 0 580 11893 2 A Briti
4、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
5、 cover, an inside front cover, pages i and ii, pages 1 and 2 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. Amendments issued since publication Amd. No.Date of is
6、sueComments Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:58:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-11:Method 1101A:1981 BSI 08-1999i Contents Page 0Introduction1 1Scope1 2Wall thickness at any point around the circumference (ei)1 3Mean outsi
7、de diameter (dm)1 4Outside diameter at any point (di)2 Figure 1 Typical dial gauge2 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:58:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank Univer
8、sity, Tue Dec 12 08:58:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-11:Method 1101A:1981 BSI 08-19991 0 Introduction This British Standard has been prepared under the direction of the Plastics Standards Committee. It describes the methods to be used for the measurement of dimensions of ther
9、moplastics pipes. It is based on ISO 3126:1974 “Plastics pipes Measurement of dimensions” prepared by Technical Committee ISO/TC 138 of the International Organization for Standardization (ISO). However, it differs from ISO 3126 in the following respects. a) The test temperature is specified as 23 2
10、C instead of 20 2 C. b) The requirements for the apparatus for the measurement of mean outside diameter at any point is less restrictive. Part 11 of BS 2782 comprises a series of methods of test normally applied to the whole range of thermoplastics pipes, fittings and valves. WARNING NOTE. This Brit
11、ish Standard does not necessarily detail all the precautions necessary to comply with the requirements of the Health and Safety at Work, etc. Act 1974. Attention should be paid to any appropriate precautions and the method should be operated only by trained personnel. 1 Scope This British Standard s
12、pecifies the apparatus and gives the procedure to be used for measuring the dimensions of thermoplastics pipes. The reference temperature is 23 2 C. The dimensions to be measured are the following: a) wall thickness at any point around the circumference, ei; b) mean outside diameter, dm; c) outside
13、diameter at any point, di. 2 Wall thickness at any point around the circumference (ei) 2.1 Required precision. The precision required in each measurement is 0.05 mm. 2.2 Measuring apparatus. The wall thickness shall be measured preferably with a dial gauge, or with any other measuring instrument giv
14、ing the same accuracy. The measuring instrument shall comply with the following requirements. a) It shall permit a reading to 0.01 mm. b) It shall be equipped with a fixed rod, of minimum length 30 mm, forming a rigid unit with the apparatus in such a way that the pointer on the dial gives a deviati
15、on of less than 0.01 mm if a force of 5 N is exerted at its extremity in the direction of the axis of the plunger. c) The extremity of the fixed rod (fixed contact point) shall be in the form of a disc perpendicular to the rod, of diameter between 6 mm and 8 mm and thickness between 1.5 mm and 2 mm.
16、 The edge of the disc shall have a rounded radius of 1 mm (see Figure 1). d) The extremity of the plunger (movable contact point) shall be hemispherical in shape with a radius of 1 mm (see Figure 1). e) The force with which the movable contact point bears on the wall of the pipe shall be less than 2
17、.5 N. f) The surfaces of the fixed and movable contact points shall be of hard steel. 2.3 Procedure. Insert the fixed contact point inside the pipe and perpendicular to the axis of the pipe and make contact without force on the internal surface of the wall. Free the plunger and seek a position for t
18、he apparatus around the circumference that provides the lowest reading. 2.4 Expression of results. Round off the lowest reading so obtained to the next higher 0.05 mm. 3 Mean outside diameter (dm) 3.1 Required precision. The precision required in each measurement is 0.1 mm. 3.2 Principle. Measuremen
19、t of the circumference of the pipe and division by 3.142. NOTEFor routine test purposes, the diameter of a pipe with a nominal diameter of 40 mm or less may be obtained from the average of four uniformly distributed measurements of diameters by calipers. 3.3 Measurement apparatus. A circumference ta
20、pe directly graduated in diameters. This tape shall comply with the following requirements: a) It shall preferably be of stainless steel. Other non-extensible, flexible materials may be used. b) It shall permit a reading to the nearest 0.05 mm. c) It shall be graduated in such a way that neither its
21、 own thickness nor the thickness of the graduation marks has any influence on the result of the measurement. d) It shall have a width in relation to the strength of the material of which it is made, such that a force of about 2.5 N on its extremities does not cause a total elongation greater than 0.
22、05 mm. Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:58:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-11:Method 1101A:1981 2 BSI 08-1999 e) It shall have sufficient flexibility to conform exactly to the circumference of the pipe. 3.4 Procedure. Appl
23、y the tape to the whole of the circumference perpendicular to the axis of the pipe. The reading shall be taken only under these conditions. 3.5 Expression of results. Round off the reading or the calculated mean outside diameter to the nearest 0.1 mm. 4 Outside diameter at any point (di) 4.1 Require
24、d precision. The precision required in each measurement is 0.05 mm. 4.2 Principle. Measurement of the maximum and the minimum outside diameters of any cross section, several outside diameters being measured around the circumference, until the maximum and minimum values are found. 4.3 Measuring appar
25、atus. Measuring instrument with one fixed jaw and one moving jaw permitting a reading to the nearest 0.05 mm. 4.4 Procedure. Place the fixed jaw of the measuring instrument on one side of the pipe and the moving jaw on the other side, perpendicular to the axis of the pipe. Move the measuring instrum
26、ent along until both jaws make a positive contact with the surface of the pipe. Take the reading after checking that the measuring instrument is in the correct position in relation to the axis of the pipe. Take measurements around the same cross-section, turning the measuring instrument in the plane
27、 of this section until the maximum and minimum values are found. 4.5 Expression of results. Round off the readings to the nearest 0.1 mm and record as the result the largest and the smallest value measured in the same cross section. Figure 1 Typical dial gauge Licensed Copy: London South Bank Univer
28、sity, London South Bank University, Tue Dec 12 08:58:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:58:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-11: Method 1101A:1981 BSI 389 Chiswick High Road
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