1、 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1989:2000 BS 2782-1
2、1: Method 1112E:2000 The European Standard EN 1989:2000 has the status of a British Standard ICS 23.040.80 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Thermoplastics piping systems Joints for buried non-pressure sewerage applications Test method for long-term sealing perfo
3、rmance of joints with thermoplastic elastomer (TPE) seals by estimating the sealing pressureThis British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 Ju
4、ly 2000 BSI 07-2000 ISBN 0 580 36079 2 BS EN 1989:2000 Amendments issued since publication Amd. No. Date Comments National foreword This British Standard is the official English language version of EN 1989:2000. The test method is incorporated into BS 2782-11, Methods of testing plastics Part 11: Th
5、ermoplastics pipes, fittings and valves, as Method 1112E:2000, for association with related test methods for plastics materials and plastics piping components. The UK participation in its preparation was entrusted to Technical Committee PRI/61, Plastics piping systems and components, which has the r
6、esponsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of org
7、anizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Stand
8、ards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. Warning This British Standard, which is identical with EN 1989:2000, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 197
9、4 and subsequent legislation. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personnel. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their co
10、rrect application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright notice displayed in this document indica
11、tes when the document was last issued. BSI 072000 (8523($167$1$5 1250(8523e(11( (8523b,6 b) if applicable, any change to the limit(s) between the time of production of the seal and the start up of testing (see 6.1). 4 Apparatus 4.1 A device, capable of measuring the specific radial sealing force exe
12、rted by a seal onto a mandrel. The apparatus consists of a steel cylinder, the mandrel, of which a segment can compress the seal in the radial direction (see 7.2.2). The surface width, C, of the segment (see Figure 1) shall have a value lying between 5 % and 10 % of the circumference of the mandrel.
13、 The segment is linked to an instrument capable of measuring the compression forces with an accuracy to within 5 % of the measured value, and with a means of measuring displacements greater than 10 micrometres (10 m) with an accuracy of 1 m. A typical arrangement of the mandrel and segment is shown
14、in Figure 1. The mandrel shall have the minimum specified outside diameter of the pipe or spigot (tolerance: + mm on the diameter) for which the socket is intended.Page 4 EN 1989:2000 BSI 072000 Key: F S : radial force connected to a force measuring device A: segment M: mandrel S: seal C: surface wi
15、dth of the segment Figure 1 Typical arrangement of mandrel and segment 4.2 Sealing width measuring device, capable of measuring the sealing width, to an accuracy to within 0,1 mm. The sealing width comprises the width of the circular contact area formed between the sealing ring and the pipe or fitti
16、ng spigot, as shown in Figure 2. This shall include the following: a) a transparent pipe spigot having an outside diameter equal to the minimum specified outside diameter (tolerance: + mm on the diameter) of the pipe for which the socket with the sealing ring is designed, and having a length of at l
17、east the depth of the socket; b) an optical device with a light source for viewing and measuring the sealing width. NOTE 1 A typical apparatus for measuring sealing width is shown in Figure 2. This shows a mirror placed in the pipe socket at an angle of (45 0,5) to the axial direction of the socket
18、such that the image of the seal in contact with the spigot is reflected into a microscope with a graduated scale. NOTE 2 If the seal has multiple lips, each individual lip will produce a circular contact area. The total width of the circular contact areas shall be measured. Key: S: seal T: transpare
19、nt spigot S W : sealing width Figure 2 Typical apparatus for measurement of the sealing widthPage 5 EN 1989:2000 BSI 072000 5 Test pieces 5.1 Sampling Unless otherwise specified see clause 3, note a), samples shall be taken at random. 5.2 Preparation At least one pair of test pieces is needed, of wh
20、ich one test piece shall be used for measuring the radial specific sealing force and the other test piece for measuring the sealing width. Each test piece shall consist of at least a complete socket cut from a pipe or a fitting, together with its TPE seal. 5.3 Number Unless otherwise specified see c
21、lause 3, note a) one pair of test pieces shall be used. 6 Conditioning 6.1 Time limits Unless otherwise specified in the referring standard, the time between production of the seal and start up of the test shall be between 24 h and 90 days. 6.2 Test temperature Tests shall be carried out at (23 2) C
22、 in accordance with ISO 471. 7 Procedure 7.1 General Carry out the following procedures using the following schedule. Carry out the first measurements of both the radial specific sealing force (see 7.2) and the sealing width (see 7.3) between 30 min and 60 min after assembling the test pieces with t
23、he apparatus. To enable extrapolation, measure and record the radial specific sealing force and the sealing width at periods which include approximately 1 h, 4 h, 24 h, 168 h, 336 h, 504 h, 600 h, 696 h, 840 h, 1008 h, 1200 h, 1400 h, 1680 h, 2000 h, 2200 h, after the first measurement. Where it is
24、not possible to make a measurement at the appropriate times between 500 h and 1008 h, it is permitted to deviate by 24 h, providing the actual measurement time is recorded and used for the regression calculations. 7.2 Procedure for determining the radial specific sealing force 7.2.1 Assemble a socke
25、t, including the TPE seal, with the mandrel (see Figure 1). Ensure that the outer surface of the segment is flush by feel with the outer surface of the mandrel. To ease assembly, dry lubricants (e.g. talc) or distilled water may be used to lubricate the seal surface.Page 6 EN 1989:2000 BSI 072000 7.
26、2.2 Measure the radial force, F, necessary to move the segment outward over a distance of not more than 0,01 % of the nominal diameter, with a minimum of 10 m. The accuracy of the displacement shall be 10 % of the displacement. Calculate the corresponding force in newtons per millimetre of the circu
27、mference of the mandrel, i.e.: F/C (see Figure 1) and record the result as the radial specific sealing force, F S , in newtons per millimetre of the spigot. The segment should be moved outward over the same distance for all subsequent readings. 7.2.3 Bring the segment back into its original position
28、 such that its outer surface is again flush with the outer surface of the mandrel, as in 7.2.1. The socket and mandrel are kept in this position at (23 2) C until the next measurement, see 7.2.2. 7.3 Procedure for determining the sealing width 7.3.1 Assemble a socket, including the TPE seal, with th
29、e transparent pipe (see 4.2). To reduce the efforts during assembly, dry lubricants (e.g. talc) or distilled water may be used to lubricate the seal surface. 7.3.2 Measure the average width (see Figure 2) of the circular area formed between the seal and the transparent pipe, with an accuracy of 0,1
30、mm. Record the result as the sealing width S W . If the apparatus described in Figure 2 is used, bring the assembled test piece into view (e.g. under a microscope). Use sufficient light to illuminate the test piece. 8 Calculation and expression of the results Using the values of respectively radial
31、specific sealing force F Sand sealing width S Wobtained at each period in accordance with 7.1, determine the best fit straight lines on a logarithmic time scale, by using least square analysis. The correlation coefficient shall be minimum 0,990. Calculate the sealing pressure P Sat 90 days, using th
32、e following equation: P S =10F S /S W where: P Sis the sealing pressure, in bars (1 bar = 10 5N/m 2 ); F Sis the radial specific sealing force, in newtons per millimetre circumference of the spigot; S W is the sealing width, in millimetres. The values for F Sand S Wshall be those derived from the re
33、gression lines for 90 days. Similarly, to calculate the sealing pressure P Sat 100 years, the values for F Sand S Wshall be those derived from the extrapolation of the regression lines. If more than one sample pair is used, an average of the extrapolated sealing pressures must be calculated. NOTE Ex
34、trapolation of test results for an estimate of the long-term sealing pressure is not an unequivocal indication of the performance of the seal over the years.Page 7 EN 1989:2000 BSI 072000 9 Continuation of the test When even the use of the last 10 data points does not lead to a correlation coefficie
35、nt higher than 0,990 in the regression analysis, continue the test by making additional measurement at 2818 h, 3400 h, 4000 h, 8000 h, 12000 h, or until the correlation coefficient exceeds 0,990 using the last 10 measurements. 10 Test report The test report shall include the following information: a
36、) a reference to this standard and the referring standard; b) the identity of the components forming the test piece (fittings or pipes, type of seal, seal ring material); c) at each test period the radial specific sealing force, F S , in newtons per millimetre of the circumference of the pipe spigot
37、 d) at each test period the sealing width, S w , in millimetres; e) the sealing pressure at 90 days and at 100 years, in bars; f) any factor which may have affected the results, such as any incident or any operating detail not specified in this standard; g) the date of the test. 11 Storage See Annex A.
