1、October 2009 Translation by DIN-Sprachendienst.English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).IC
2、S 23.040.20!$s these are to be complied with where relevant. Some of these product standards are listed in the bibliography for the information of users of this standard. Please note that because European Standards are continually being developed, this list is not exhaustive. 2 Normative references
3、The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN 8079, Chlorinated polyvinyl chloride (PVC-C)
4、pipes Dimensions DIN EN 744, Plastics piping and ducting systems Thermoplastics pipes Test method for resistance to external blows by the round-the-clock-method DIN EN 10204, Metallic products Types of inspection document DIN EN ISO 179 series, Plastics Determination of Charpy impact strength DIN EN
5、 ISO 306, Plastics Thermoplastic materials Determination of Vicat softening temperature (VST) DIN EN ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 1: General method DIN EN ISO 2505, Thermoplastics pipe
6、s Longitudinal reversion Test methods and parameters DIN EN ISO 9080:2003-10, Plastics piping and ducting systems Determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation 3 Terms and definitions For the purposes of this document the following term
7、s and definitions apply. 3.1 long-term hydrostatic strength strength of a pipe subjected to internal pressure p NOTE Calculated as in equation (1). 4 DIN 8080:2009-10 eedp2= MPa (1) where P is the internal pressure, in MPa1); d is the outside diameter of the pipe, in mm; is the wall thickness of the
8、 pipe, in mm. 4 Material (moulding material) 4.1 General Pipes shall be made of unplasticized chlorinated polyvinyl chloride (PVC-C). The choice and dosing of vinyl chloride homopolymers, stabilizers and other additives (e.g. pigments, lubricants) shall be left to the pipe manufacturer. The standard
9、 does not apply to the use of recycled materials or reinforced moulding materials (e.g. with chalk or glass fibres). The use of own reprocessable material is permitted. Moulding materials and additives of unknown identity and composition shall not be used. 4.2 Demonstrating long-term hydrostatic str
10、ength It shall be demonstrated that values for the long-term hydrostatic strength of the material used lie on or above the reference line (time-to failure curve) shown in Figure 1. Long-term hydrostatic strength shall be determined as in DIN EN ISO 9080. Extrapolation values and limits are based on
11、the extrapolation factors given in Table 2 of DIN EN ISO 9080:2003-10. The reference lines are based on equation (2). ( )TTt lg02742,5087,70243lg4,8972195,109lg += (2) In the above: t is the time, in h; T is the temperature, in K; is the long-term hydrostatic strength, in MPa. 1) 1 MPa = 10 bar 5 eD
12、IN 8080:2009-10 Figure 1 Reference lines for long-term hydrostatic strength (time-to-failure curves) for PVC-C pipes 6 DIN 8080:2009-10 5 Requirements 5.1 Form supplied and surface quality Pipe ends should be cut as square as possible to the pipe axis. Pipes shall be free from any blisters, blowhole
13、s and any other inhomogeneities which could impair their performance. Pigmentation shall be uniform throughout. Pipe surfaces shall be smooth both inside and out. Shallow grooves and the resulting minor irregularities in wall thickness are permitted, as long as the actual wall thickness does not go
14、below the nominal value. Sharp edged grooves and cavities are not permitted in any case. Testing shall be as in 6.1. 5.2 Dimensions, tolerances and out-of-roundness The pipe outside diameter, wall thickness and out-of-roundness, and the relevant tolerances shall be as in DIN 8079. Testing shall be a
15、s in 6.2. For pipes with special dimensions which are not covered by DIN Standards because they deviate from preferred number series and international specifications, calculations shall be made on the basis of DIN 8079. 5.3 Strength characteristics determined by long-term hydrostatic strength testin
16、g When tested in accordance with 6.3 pipes shall meet the strength requirements of Table 1. Table 1 Test conditions for long-term hydrostatic strength testing Test temperature C Exposure medium Proof stress 0 MPa Test time (min. failure time) t h 20 Water inside/air outside or water inside/water out
17、side 43 1 5,6 165 4,6 1 000 95 Water inside/air outside 3,6 8 760aaQuality control shall be carried out at the start of production or when any modifications are made to the materials or manufacturing process. The proof stress values 0specified in Table 1 correspond to the stresses marked O in Figure
18、 1. 5.4 Impact strength 5.4.1 General Impact strength may be determined either as in 6.4.2 or by testing resistance to external blows as in 6.4.3. 7 DIN 8080:2009-10 5.4.2 Impact strength when testing as in 6.4.2 When testing as in 6.4.2 the failure rate shall not exceed 10 % of the number of specim
19、ens tested. 5.4.3 Resistance to external blows When testing as in 6.4.3 the True Impact Rate (TIR) shall not be greater than 10 %. 5.5 Heat reversion When testing in accordance with 6.5 the mean relative change in pipe length shall not be greater than 5 %. There shall be no blisters, cracks or flaki
20、ng. 5.6 Vicat softening temperature When tested as in 6.6 the Vicat softening temperature shall be VST/B/50 110 C. 6 Testing 6.1 Surface quality The inside and outside surfaces of the pipe shall be inspected with backlight. 6.2 Dimensions and out-of-roundness The mean pipe outside diameter shall be
21、determined to an accuracy of 0,1 mm. The wall thickness shall be determined to an accuracy of 0,1 mm by measuring the circumference at at least four points spaced as evenly as possible around the pipe. Measurements shall be taken at ambient temperature or, in cases of dispute, at (23 2) C. Out-of-ro
22、undness shall be determined to an accuracy of 0,1 mm immediately after production. The specifications of DIN 8079 apply. 6.3 Strength characteristics determined by long-term hydrostatic strength testing General information on testing is given in DIN EN ISO 1167-1. For each proof stress value as in T
23、able 1 take three sections of pipe (referred to below as “pipes”) as test pieces having a length l1(see Figure 2): for d 250 mm: l1 3 d + 2 l5+ 250 mm for d 250 mm: l1 1000 mm + 2 l58 DIN 8080:2009-10 Figure 2 Test piece for long-term hydrostatic strength test where d is the pipe outside diameter, i
24、n mm; l1is the test piece length, in mm; l2is the test length, in mm; l3is the length of pipe affected by clamping of end caps, in mm; for d 250 mm: l3= d; for d 250 mm: l3= 250 mm; l4is the assessment length, in mm; l4 l2 2 l3; l5is the free length, in mm (for end caps). Along the assessment length
25、 l4of the pipe, determine the wall thickness e at eight points and the outside diameter d at three points, in both cases by circumferential measurement and to an accuracy of 0,1 mm; also determine the minimum wall thickness eminand the mean outside diameter .d Fit end caps to both ends of the pipe,
26、ensuring free axial movement during testing. Through an opening in one of the end caps, fill the pipe with water at the test temperature specified in Table 1 (to within 5 K), then place the pipe in a bath which has been heated to the test temperature (maintained to within 1 K) and leave it there for
27、 at least 1 h. If the pipe is filled with cooler water, leave it in the bath for 12 h until temperature equilization is achieved. For testing at raised temperatures only the exposure medium “water inside/air outside” shall be used. With the pipe still in the bath, steadily increase the pressure for
28、1 min until the specified test pressure is reached. Maintain the test pressure to within (+2/1) % throughout the test time (minimum time-to-failure) specified in Table 1. Calculate the test pressure p using equation (3): min0min2edep= (3) where d is the mean outside diameter over l4, in mm; eminis t
29、he minimum wall thickness over l4, in mm; 0is the proof stress as in Table 1, in MPa. Determine whether the pipe has failed or developed signs of leakage during the specified test time. If the pipe has failed within length l3(clamping zone) during this period, disregard the test results and repeat t
30、he test. 9 DIN 8080:2009-10 6.4 Impact strength 6.4.1 General Testing can be carried out as in either 6.4.2 or 6.4.3 of this standard. 6.4.2 Impact strength testing Specimens shall be taken from pipes and be either in the form of pipe sections or of bars taken along the pipe axis, with the dimension
31、s shown in Table 2. Bar specimens shall be cut from the same pipe section at points spaced as evenly as possible around the pipe circumference. The pipe surfaces shall not be machined. Testing shall be carried out on 10 specimens using a pendulum testing machine as in DIN EN ISO 179, but taking the
32、test parameters from Table 2 of the present standard, and applying the impact to the specimens outer surface. Testing shall be carried out at (23 2) C. Table 2 Test conditions for impact test Pipe Specimen Impact energy Distance between supports Outside diameter d mm Wall thickness e mm Length mm Wi
33、dth mm Height mm J mm 25 9,5 120 2 15 0,5 in accordance with unmachined wall thickness = e 50 70 5,00+Determine whether the specimens fail. If more than 10 % of the specimens fail, repeat the test on 20 new specimens from the same batch. In this case, the failure rates in the first and second tests
34、shall be added together for evaluation. 10 DIN 8080:2009-10 6.4.3 Resistance to external blows See DIN EN 744 for general information on testing. Table 3 Striker Striker type Types d25 and d90 Striker mass As in Table 4 or 5 Fall height As in Table 4 or 5 Test temperature (0 1) C Table 4 Masses and
35、fall heights for pipe series SDR 9 to SDR 26 at level M*)Outside diameter d mm Mass m kg Fall height h mm 20 400 25 500 32 600 40 800 50 0,5 1 000 63 1 0075 000 90 0,8 1 200 110 1,0 1 600 125 1,25 2 000 140 1 80160 1,6 2 000 180 1 80200 2,0 2 000 225 1 80250 2,5 2 000 280 1 80 315 3,2 2 000 *) Trans
36、lators note: As in ISO 3127, Annex B. 11 DIN 8080:2009-10 Table 5 Masses and fall heights for pipe series SDR 34,4 at level H*)Outside diameter d mm Mass m kg Fall height h mm 20 400 25 500 32 600 40 800 50 0,5 1 000 63 1 0075 0,8 1 200 90 1,0 2 00110 1,6 000 125 2,5 2 00140 1 800 160 3,2 2 000 180
37、1 80200 4,0 2 000 225 1 80250 5,0 2 000 280 1 80 315 6,3 2 000 For other SDR series as in DIN 8079 impact testing shall be as in 6.4.2 of the present standard. 6.5 Heat reversion Specimens shall be either three complete 200 mm-long pipe sections or, where the pipe outside diameter is d 200 mm, 200 m
38、m-long sections having an approximate arc length of 200 mm cut along the pipe axis. In the latter case the 200 mm-long pipe section shall be divided, along the entire circumference, into pieces measuring approximately 200 mm 200 mm (e.g. a 200 9,6 pipe shall be cut into three pieces and a 400 11,7 p
39、ipe into 6 pieces). The direction of the pipe axis shall be marked on the pieces, all of which are to be tested. A mark shall be made on the outside surface of each specimen about 50 mm from each end, in the axial pipe direction (for complete pipe sections the mark shall be applied around the entire
40、 circumference). The distance between the two marks l0(initial length) shall be about 100 mm and is to be measured at (23 2) C to an accuracy of 0,25 mm. To ensure that changes in length are not obstructed, place the specimens convex side down on a glass plate dusted with talcum. Then, in accordance
41、 with DIN EN ISO 2505 place the glass plate with the specimens in an air oven that has been brought to the test temperature and leave it there according to the conditions specified in Table 6. *) Translators note: As in ISO 3127, Annex B. 12 DIN 8080:2009-10 Table 6 Test conditions for heat reversio
42、n test Wall thickness e mm Test temperature C Test period t min 4 30 1 4 16 150 2 120 1 After removing the specimens from the oven and leaving them in the same position on the plate cooling them in air to (23 2) C, measure the minimum distance lminbetween the two marks. Calculate the relative change
43、 in length , in %, using equation (4): 10010000min0=lllll (4) where l0is the distance between marks before heat treatment, in mm; lminis the distance between marks after heat treatment and after cooling, in mm; l l0 lmin. The mean relative change in length for the pipe under test is given by the ari
44、thmetic mean of the relative changes in length determined as shown above. Specimen surfaces shall also be examined to establish whether blisters or cracks have occurred as a result of heat treatment. 6.6 Vicat softening temperature Cut three specimens sized 10 mm 10 mm 3 mm to 6,5 mm at points as ev
45、enly spaced around the circumference of a pipe section as possible. If the pipe thickness is less than 3 mm two specimens shall be stacked together. If the pipe thickness is greater than 6,5 mm the specimen thickness shall be reduced to about 5 mm by machining away the outer pipe surface. Because th
46、e specimen surfaces are curved, the indenting tip shall be placed on the inner surface. Testing shall be carried out as in DIN EN ISO 306, using method B50. The arithmetic mean of the temperatures determined for the three specimens shall be taken as the result. 6.7 Inspection documents If so agreed,
47、 the pipe manufacturer shall issue an inspection document as in DIN EN 10204 regarding routine testing during production. 13 DIN 8080:2009-10 Annex A (informative) Explanatory notes This standard is a basic standard which specifies general quality requirements and test methods for PVC-C pipes. Speci
48、fications regarding the scope of testing, inspection and requirements for special applications are to be laid down by the relevant bodies. The requirements and test methods specified in this standard are based on long-term investigations carried out by FNK-KOA 504 Koordinierung der Kunststoff-Rohr-N
49、ormung, particularly by its Working Committee 504.2 Prfverfahren fr Rohre (renamed as NA 054-05-02 AA Prfverfahren fr Rohre). The time-to-failure curves for the temperature range +10 C to +95 C have been revised. These curves are a normative element of this basic standard on PVC-C pipes. The expected lifetime of the pipes and safety factors have been taken into consideration here. Specifications with regard to pipe materials and manufacturi
