1、CEN ENs1411 96 3404589 0333599 348 BRITISH STANDARD Plastics piping and ducting systems - Thermoplastics pipes - Determination of resistance to external blows by the staircase method The European Standard EN 1411 : 1996 has the status of a British standard ICs 23.040.20 NO COPYING WITHOUT BSI PERMIS
2、SION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 1411 : 1996 BS 2782 : Part 11 : Method 1108B 1996 CEN EN*L4LL 96 = 3404589 0L33600 T BS EN 1411 : 1996 Committees responsible for this British Standard The preparation of this British Stanhd was entrusted to Technical Committee PRV61, Plastics piping s
3、ystems and components, upon which the following bodies were represented: British Gas plc British Plastics Federation British Plumbing Fttings Manufactured Association British Valve and Actuator Manufa.cturs Association Department of the Environment (British Board of Agrement) Depariment of the Envir
4、onment (Building Research Establishment) Department of the Environment (Property and Buildings Directorate) Department of Ii.ansport Electricity Association Federation of Civil Engineering Contractors Health and Safety Executive institute of Building Control Institute of Materials institution of Civ
5、il Engineers institution of Gas Engineers institution of Water and Environmental Management National Association of Plumbing, Heating and Mechanical Services Pipeline industries Guild Plastics Land Drauiage Manufacturers Assocon Society of British Gas Indushies Society of British Water indushies Wat
6、er Companies Association Water Services Association of England and Wales Contmctors The following bodies were also represented in the drafting of the standard, through subcommittees and panels This British Standard, having been prepared under the direction of the sector Board for Materials and Chemi
7、cals, was published under the authority of the Standards Board and comes into effect on 15 August 1996 O BSI 1996 ERA Technology Ltd. Engineering Equipment and Materials Users Association WRA Technology Ltd. Amendments issued since publication Amd.No. ID - editorial changes have been introduced. The
8、 material-dependent parameters and/or performance requirements are incorporated in the system standard(s) concerned Annex A, which is informative, gives a bibliography This standard is one of a series of standards on test methods which support system standards for plastics piping systems and ducng s
9、ystems. This European Standard shall be given the status of a naonai standard, either by publication of an identical text or by endorsement, at the latest by July 1996, and conflicting naona standards shall be withdrawn at the iatest by July 1996. According to the CEN/CENELEC inted Regulations, the
10、foliowing countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany,Greece, Iceland, ireland, Ita b) the test and conditioning temperatures and the conditioning medium (see 4.2 and Clause 6); c) the method of sampling (see 6.1); d) if appropriate, t
11、he number of test pieces to be used (see 6.2 and clause 7); e) if applicable, the position of impact on the test piece andlor any alternative or additional criteria (see b), c) and d) of 7.1); f) if applicable, the initiai drop height to be used in place of the preiiminary test procedure (see e) of
12、7.1); g) the required H50 value for the pipe (see a) of 7.2.1). 4 Apparatus 4.1 A falling weight impact testing machine incorporating the following basic components (see figure 1): a) main frame, with guide rails or a guiding tube rigidly fixed in the vertical position, to accommodate a striker (see
13、 b) and release it to fall vertically and freely such hat the speed of the striker at the moment of hitting the pipe is not less than 95 % of the theoretical speed; b) striker, having a nose comprising all or patt of a hemispherical form combined with a cylindrical stem at least 10 mm long and havin
14、g dimensions conforming to table 1 and figure 2, dependmg upon the mass of the striker. The mass of the striker, including any associated weights, shall be selected from table 2. Below the stem, the nose shall be of steel with a minimum wall thickness of 5 mm and the striking surface shall be free f
15、rom imperfections that could influence the results. Table 1. Dimensions for the nose of the striker (see figure 2) I *)Not specified I Table 2. Masses of strikers Masses in kiloim Illlass of striker * 0,006 kg I 075 1,25 2,5 5,o 10,o 10.8 1,6 32 Ici3 iz,5 O BSI 1996 - CEN ENxL4LL 96 3404589 0133606
16、308 Page 4 EN 1411 : 1996 Key A B C D E F G Guide Graduated scale, vertically adjustable for different sizes of pipe Main frame Striker Steel block 120, V-shaped or flat (see c) of 4.1) Solid base Sufficient to give a clear height from striker to pipe of at least 2 m Figure 1. mical impact testing m
17、achine c) rigid test piece support, having one of the following forms as applicable. 1) For pipes having a circular exteniai cross section, consisting of a 120 o V-block of steel at least 200 mm long, positioned so that the axis of the line of fall of the nose of the striker shall intersect the axes
18、 of the v to within f 2,5 mm (see figure 1). 2) For pipes with a flat bottom, a horizontai support of fiat steel together with guides to ensure that the line of fall of the striker shaJ intercept to within 2,5 mm the striking point specified on the test piece by the referring standard. The support c
19、onstruction shall be sufficiently rigid not to cushion the effect of the impact. d) release mechanism, such that the striker can fall from a variable height which can be dusted up to 2 m, as measured from the top surface of the test piece with an accuracy of 10 mm. The drop height shall be a multipl
20、e of 100 mm. 4.2 A liquid bath or air cabinet, capable of maintaining one of the following conditionhg temperatures for testing at the temperature as specified in the referring standard. For testing at O OC, the conditionhg temperature shall be (O 1) “C. For testing at -20 OC, the conditionhg temper
21、ature shall be (-20 f 2) “C For testing at +23 OC, the conditioning temperature shall be (+ 23 * 2) “C. O BSI 1996 CEN EN*14LL 96 = 3404589 0333607 244 , Page 5 EN 1411 : 1996 d=25 4 I .- E I E I n i/ I /I d =90 4 4 Dimensions in millimetres Figure 2. Dimensions of strikers 5 Test pieces 6.2 Number
22、6.1 Preparation The test pieces shall be cut from pipes selected at random. In the case of pipes hahg lOnhW seam wes, the seam iines (see note) shad be marked, e.g. with different colours, before the pipe is cut as follows. NOTE. When pipes are continuously moulded between two running moulds, lines
23、are formed in the longitudinal direction of the pipe which are caiied seam lines. For each test piece, the length shall be (200 f 10) nun. clean and free from damage. For helically ribbed pipes the cut end of the helical rib shall be rounded off in order to eliminate any sharp edges. Unless otherwis
24、e specied by the referring standard, up to 50 test pieces shall be used as foows: a) for a given striker mass, up to 10 test pieces may be used for the preliminary test procedure (see 7.2) to determine the drop height which provokes the first failure; b) at least 20 test pieces are used for the main
25、 test procedure (see 7.3). me cut en b) for pipes which are corrugated or ribbed extedy the wail thickness e, shall be the minimum waH thickness between inside and outside surfaces both in contact with the conditioning fluid of the pipe shall be the total I Table 3. Conditioning periods I wail thick
26、ness e+ I mm Conditioning period b) 0,5 m. 7.2.2 Remove a test piece from the conditioning environment and within 10 s position it on the appropriate support and subject the test piece to one impact by the striker. Determine and record whether the test piece failed (see d) of 7.1). If it did not fad
27、, proceed in accordance with 7.2.6. Otherwise, record the type of failure and proceed in accordance with 7.2.3 or 7.2.4, as applicable. 7.2.3 If testing in accordance with a) of 7.2.1 and the first result is a failure, repeat 7.2.2 using the same drop height and another test piece. If the second res
28、ult is a pass proceed in accordance with 7.2.6. If the second result is a failure record the sample as not conforming to the specified value and proceed to clause 9. 7.2.4 If testing in accordance with b) of 7.2.1 and the first result obtained is a failure, repeat 7.2.2 using a drop height of 0,30 m
29、 and another test piece. If the second result is a pass proceed in accordance with 7.2.6. If the second result is a failure, if possible select a -striker having the next lighter mass in accordance with table 2 and recommence testing in accordance with 7.2.1. therwise, if aiready using a *er mass of
30、 0,25 kg record the result and proceed to claw 9. Q BSI 1996 CEN EN*L41L 76 W 3404587 0333607 017 1.4 12 1 1,o * 0.8 0.6 U- 0.2 o Page 7 EN 1411 : 1996 - - - Il - 1-1 - - +-+ - +Il + II II + Il - Il -+ + -+ II+- +I I + - - I I I I: I I I I I I I I I I- D i t C + - Key A Heightinmetre B Number of blo
31、ws C Preiminary test procedure D Main test procedure + indicatesapass - indicates a failure Figure 3. Qpical record for impact test data, obtained using the staircase method (in this example, the H50 value = 1,14 m) * o * 7.2. Reset the striker drop height 0,2 m higher and test another test piece in
32、 accordance with 7.2.2. If nec-, repeat this step until the first failure occurs. Record the drop height for the first test piece that fails 7.3.3 If the result obtained in accordance with 7.3.2 was a failure, reset the striker drop height 0,l m lower otherwise reset it 0,l m higher, and test anothe
33、r test Piece in acc01-danCe with 7-3.2. for use as the first test piece result for the main test procedure (see 7.3). If the drop height has reached 2 m without failure, select the striker having the next greater mass in accordance with table 2 and recommence testing in accordance with 7.2.1 (see a)
34、 of 6.2). 7.3 Main test procedure 7.3.1 Record as the striker drop height for the first result that height obtained in accordance with e) of 7.1 or with 7.2, as applicable. Set the striker drop height 0,l m lower than that thus recorded. 7.3.2 Remove a test piece b) the fuil identification of the pi
35、pe under test, including application, material, dimensions; c) the method of sampling; d) the numbers of test pieces used for the preiiminary and main test procedures, respectiveiy; e) the conditioning medium and its temperature, in degrees Celsius; f) the type of striker and its mass, in kiiograms;
36、 g) if applicable, details of other failure criteria (see e) of 7.1); h) the minimum and the maximum drop heights found during the main test procedure or the drop height used if testing was stopped in accordance with 7.2.3 and 7.2.4; i) the H50 value; j) any factors which may have affected the resul
37、ts, such as any incidents or any operating details not specified in this standara k) the date of test. O BSI 1996 CEN EN*1411 96 3404589 OL33bLL 775 D Page 9 EN 1411 : 1996 Annex A (informative) Bibliography EO 66031 : 1985 Phtics - Determination of multiaxial impact behaviour of rigid plustics - Pa
38、rt 1: Fauing dart method O BSI 1996 CEN EN*LYLL 96 3404589 OL33bL2 bOL m BS EN 1411 : 1996 BS 2782 : Part 11 : Method 1108B : 1996 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It present
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