1、STD-BSI BS EN 12293-ENGL 2000 BRITISH STANDARD Lb24bb9 0853220 371 m Plastics piping systems - Thermoplastics plpes and fittings for hot and cold water - Test method for the resistance of mounted assemblies to temperature cycling The European Standard EN 122931999 has the status of a British Standar
2、d ICs 23.040.20; 23.040.45 BS EN 12293:2000 Method 1123Z2000 BS 2782-11: NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW STD.BSI BS EN 12273-ENGL 2000 E 1b24bb9 0851221 208 = been prepared under the direction of the Sector Committee for Materiais and Chemicals, was published u
3、nder the authority of the Standards Committee and comes into effect on 15 May 2000 Amd. No. o BSI 05-2000 BS EN 12293:2000 Date Comments National foreword This British Standard is the official English language version of EN 122932000. The UK participation in its preparation was entrusted to Technica
4、l Committee PRY61, Plastics piping systems and components, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposa
5、ls for change, and keep the UK interests informed them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. The responsible UK committee gives the following advice concerning the use and interpretation of this British Standard. a) In 3.2 a) an
6、d in 3.3 reference is made to “water velocity”. This is residual text from the draft sandard which should have been changed to reflect redrafting of 3.1 a), of 3.3 and of clause 7 to to remove references to water velocity and/or to relate instead to the specified limits for the temperature variation
7、 throughout the test piece. For consistency with the wording of 3.1 a), of 3.3 and of 6.2 in EN 122931999, it is considered that in 3.2 a) the words “(see 6.2)” should now be read as “(see 3.3)”. b) In 3.8, the tensioning device is required to stress the pipe to the stress given in the referring sta
8、ndard. At the time of going to print, neither the referring standards nor this standard provide enough detail to calculate the force needed. In principle, this force could be based on actual pipe dimensions (if so, the detail is required as to how and where it is to be measured) or taken from the re
9、ferring standard (if this is the case then the standard might choose to require use of nominal or of specified minimurn or maximum valves for the thickness and likewise for the diameteq differing results wili be obtained depending upon the options specified). If a 23.040.45 English version Plastics
10、piping systems - Thermoplastics pipes and fittings for hot and cold water - Test method for the resistance of mounted assemblies to temperature cycling SystBmes de canalisations en plastique - Tubes thermoplastiques et raccords pour installations deau chaude et froide sous pression - Mthode dessai d
11、e la rsistance des assemblages des cycles de tempratures Kunststoff-Rohrleitungssysteme - Rohre aus Thermoplasten und Formstcke fr Warm- und Kaltwasser - Prfverfahren des Widerstandes von montierten Baugruppen gegen Temperatuwechselbeanspruchung This European Standard was approved by CEN on 13 Decem
12、ber 1998. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this Europajn Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning sich national standards may be obt
13、ained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by trmslation under the responsibility of a CEN member into its own language and notified to the Central Secr
14、etariat has the same status as tie official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROP
15、EAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Centrai Secretariat: rue de Stassari, 36 B-1050 Brussels Q 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12293:1999 E STD-BSI BS
16、 EN L2293-ENGL 2000 1624bb9 085122Y TL7 Page 2 EN 12293:1999 Foreword This European Standard has been prepared by Technical Committee CENiTC 155, Plastics piping systems and ducting systems, the Secretariat of which is held by NNI. This European Standard shall be given the status of a national stand
17、ard, either by publication of an identical text or by endorsement, at the latest by January 2000, and conflicting national standards shall be withdrawn at the latest by January 2000. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are
18、 bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. The material-dependent parameters and/or performance require
19、ments are incorporated in the System Standard(s) concerned. This standard is one of a series of standards on test methods which support System Standards for plastics piping systems and ducting systems. Q BSI 05-2000 STD.BS1 BS EN 12293-ENGL 2000 Lb24bb 0853225 753 Page 3 EN 12293: 1999 I Scope This
20、standard specifies a method for testing the resistance to temperature cycling of joints for piping systems with rigid or flexible thermoplastics pipes. It is applicable to thermoplastics piping systems intended to be used in hot and cold water pressure applications. 2 Principle A test assembly of pi
21、pes and fittings is subjected to temperature cycling by the passage of water under pressure using hot and cold water alternately for a specified number of cycles. While being subjected to temperature cycling parts of the assembly of pipes and fittings are maintained under tensile stress and/or flexu
22、ral strain by the use of static clamps. During and after the test the assembly is monitored for signs of leakage. NOTE: It is assumed that the following test parameters are set by the standard making reference to this standard: a) the test temperatures (see 3.1, 3.2 and 6.1); b) the duration of a co
23、mplete cycle and each part of the cycle (see 3.1, 3.2 and 6.1): c) the test pressure (see 3.6 and 6.1): d) the tensile stress (see 3.8 and 5.3); e) the bending radius (see clause 4 and Figures 1 and 2); 9 the total number of cycles, including the first five cycles (see 6.2 and 6.3). 3 Apparatus 3.1
24、Cold water source, capable of all of the following: a) supplying the water volume necessary to maintain the temperature variation throughout the test piece within the specified maximum difference (see 6.2); b) supplying this water at the lowest temperature specified in the referring standard to with
25、in I5 “C; c) supplying this water for the duration of at least each cycle as specified in the referring standard. 3.2 Hot water source, capable of all of the following: a) supplying the water volume necessary to achieve the required water velocity (see 6.2); b) supplying this water at the highest te
26、mperature specified in the referring standard to within 112 “C; c) supplying this water for the duration of at least each cycle as specified in the referring standard. 3.3 Balancing valves, capable of regulating the water velocity as necessary to maintain the temperature variation throughout the tes
27、t piece within the specified maximum difference (see 6.2). 3.4 Alternation equipment, capable of achieving each change in hot and cold water temperature at the inlet within 1 min. 3.5 Thermometer(s), capable of checking conformity to the specified test temperatures (see 3.1, 3.2 and 6.2). 6 BSI 05-2
28、000 Page 4 EN 12293: 1999 3.6 Pressure gauge(s) and a device, for regulating the water pressure in the test assembly at the pressure specified in the referring standard to an accuracy of *0,5 bar), except for brief pressure spikes that may occur when the temperature of water is changed. 3.7 Supporti
29、ng brackets, as appropriate, comprising anchor brackets (fixed points) capable of restraining piping components, and guide brackets, capable of supporting piping components without inhibiting longitudinal movement (see clause 5 and Figure 1). 3.8 Tensioning device, capable of applying the required i
30、nitial tensile stress (see 5.3). NOTE: This is to simulate stress which may be induced in any fixed pipe section as a result of contraction caused by cooling to temperatures below those prevailing during installation. 4 Test assembly The test assembly shall comprise an assembly of pipes and fittings
31、 jointed and clipped in accordance with Figure 1 and the manufacturers recommended practice, except as follows. If, when following the manufacturers recommended practice, the pipe cannot be bent to the configuration shown for branch C in Figure 1, e.g. because of the material, wall thickness and/or
32、outside diameter of the pipe, then branch C shall conform to Figure 2. The test assembly as shown in Figure I shall include the following: a) for branch A: at least three pre-stressed pipes linked by straight connectors, stressed in accordance with 5.3, where the free length of such a combination sh
33、all be (3 O00 f 5) mm; b) for branch B: at least two straight pipes, each free to move and having a free length of (300 f 5) mm; c) for branch C: at least one bend (see Figure I or 2, as appropriate) supported by ends. The free length of pipe shall either be in the range of 27dn to 28dn, where d, is
34、 the nominal diameter of the pipe, or alternatively shall have a length which enables the minimum pipe bending radius, as stated by the manufacturer, to be formed. 5 5.1 If applicable, subject the test assembly to preconditioning in accordance with the recommendations of the manufacturer(s) of pipin
35、g components and/or the jointing components (e.g. adhesive). 5.2 Condition the test assembly at a room temperature of (23 f 5) OC for at least I h. 5.3 Pre-stress branch A of the test assembly to the tensile stress specified in the referring standard and fix in position the free ends of the stressed
36、 branch. 5.4 Fill the test assembly with cold water so that all air is expelled. Preparation of the test assembly 6 Procedure 6.1 Start the sequence of cycles, of cold and then hot water, specified in the referring standard see b) and 9 of the note to clause 21 under the conditions of pressure and t
37、emperatures applicable to the class of service conditions as specified in the referring standard. 6.2 Within the first five cycles: a) adjust the balancing valve(s) so that for the remainder of the test, during ea:h part of the water cycle where a temperature is to be maintained the temperature drop
38、 between the inlet and the outlet of the test assembly will be less than 5 OC; b) perform any tightening or adjustment of joints necessary to eliminate any leakage. 1 bar = lo5 N/m2 = 100 kPa O BSI 05-2000 STD-BSI BS EN 12293-ENGL 2000 3b24bb 0853227 726 Page 5 EN 12293:1999 6.3 Throughout and follo
39、wing completion of the number of cycles specified by the referring standard, inspect all joints for any signs of leakage, e.g. scaling. If leakage occurs, record the type and position of the leakage and when it was observed. 7 Testreport The test report shall include the following information: a) th
40、e reference to this standard and to the referring standard; b) the identification of the components under test, including the class of service condition and the operating pressure; c) whether the pipe was flexible or rigid; d) in the case of flexible pipes, the bending radius applied in branch C; e)
41、 the tensile stress in branch A; 9 the test temperatures (lower and higher temperature of the cycle), in degrees Celsius; g) the duration of the complete cycle and each part of the cycle, in minutes; h) the total number of complete cycles (including the first five cycles); i) the test pressure, in b
42、ars; j) signs of leakage, if any, and where and when it occurred; k) any factors which may have affected the results, such as any incidents or any operating details not specified in this standard; I) the date of test. O BSI 05-2000 STD.BS1 BS EN 12293-ENGL 2000 W Lh24bb9 0651228 bb2 Page 6 EN 12293:
43、1999 Dimensions in millimetres Fixed straight connector y Fixed elbow Straight connector - Free pipe - Pipe with guide Elbow J A Branch A (anchored section) B Branch B (section free to expand and contract) C Branch C (cold bent pipe section) Figure 1 - Test arrangement C e Fixed straight connector -
44、 Free pipe H Straight connector Ebow $I y Fixed elbow C Branch C (for rigid pipes) Figure 2 -Alternative test arrangement of branch C for rigid pipes O BSI 05-2000 STD-BSI BS EN L2233-ENGL 2000 = Lb24bb9 085L229 5T9 W BS EN 12293:2000 Method 1123E2000 BS 2782-11: BSI 389 Chiswick High Road London w4
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