ISO-13480-1997.pdf
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1、INTERNATIONAL STANDARD IS0 13480 First edition 1997-09-l 5 Polyethylene pipes - Resistance to slow crack growth - Cone test method Tubes en po/y a=4OOnet; p=ko; 0=kocs; s=central Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO
2、 Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:46:38 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD 8 IS0 IS0 13480:1997(E) Polyethylene pipes - Resistance to slow crack growth - Cone test method 1 Scope This International Stan
3、dard specifies a method of test for determining the resistance to slow crack growth of polyethylene pipe expressed in terms of the rate of crack growth in a notched pipe ring subject to a constant hoop strain and immersed in a surface active solution held at an elevated temperature. 2 Normative refe
4、rences The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International S
5、tandard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 3126:1974, Plastics pipes - Measurement of dimensions. IS0 13479:1997, Polyolefin pip
6、es for the conveyance of fluids - Determination of resistance to crack propagation - Test method for slow crack growth on notched pipes (notch test). 3 Principle Rings cut from pipe to a specified length are held at a constant strain by insertion of a mandrel and a single notch is made at one end of
7、 the pipe ring. The assembly is immersed in a specified surface-active solution held at a temperature of 80 “C f 1 “C. The rate of growth of the crack propagating from the notch is measured. The test is applicable to pipe of wall thickness up to and including 5 mm. NOTE 1 For wall thickness greater
8、than 5 mm, IS0 13479 is applicable. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:46:38 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 13480:1997(E) 0
9、 IS0 4 Materials 4.1 Surface active solution A nonyl-phenoxy(ethyleneoxy)ethanol neutral type detergent shall be used with 11 ethyleneoxide molecules as shown below: C9H19 0-KHyCHrO),-H where n is 11. Prepare a sufficient quantity of a solution of a concentration equivalent to 5 % by weight of the d
10、etergent with deionised water to ensure complete immersion of the range of sizes to be tested. This solution will age with time at 80 “C. Therefore the solution shall be used for no more than 100 days. 5 Apparatus 5.1 Thermostatically controlled tank Thermostatically controlled tank to contain the s
11、urface active solution of dimensions to ensure full immersion of the range of specimen sizes to be tested. The tank shall be constructed from materials which shall not affect the surface active solution. It shall have a lid or cover to prevent evaporation and a means of stirring the solution, NOTE 2
12、 The object of stirring is to prevent separation or layering of the solution. 5.2 Cone A mandrel of dimensions specified below with a conical end is required for insertion into the pipe ring to maintain a constant strain, see figure 1. At the end of the mandrel is a longitudinal groove of dimensions
13、 20 mm f 1 mm by 1 mm f 0,2 mm and depth (e) 2 mm f 0,2 mm. The material used for manufacture of the mandrel shall not affect the surface active solution, brass for example. D = 1,12 x the nominal internal diameter of the pipe (* 0,l mm). H = D for nominal outer diameters not exceeding 40 mm, and D/
14、2 for nominal diameters above 40 mm (* 1 mm). R = 4 x the specified internal diameter of the pipe of nominal size of less than or equal to 40 mm, and equal to the nominal internal diameter of pipe of nominal size above 40 mm (* 2 mm). The nominal internal diameter is equal to the nominal pipe size l
15、ess twice the specified minimum wall thickness. 5.3 Press or vice A press to drive the mandrel into the pipe ring at a rate which will not cause damage or distort the end or edges of the ring. Alternatively a vice with retaining and guiding jaws can be used. 5.4 Notching device A notching device is
16、required which is capable of inserting a razor blade into the end of the pipe to create a notch, as shown in figure 2. Alternatively a mechanised means of performing this operation, such as using a specialised jig or a machine with a moving table, is acceptable. 2 Copyright International Organizatio
17、n for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:46:38 MDTNo reproduction or networking permitted without license from IHS -,-,- Q IS0 IS0 13480: 1997(E) Dimensions in millimetres Pipe Figure 1 - Virole or cone A commer
18、cial razor blade shall be used for this operation which shall be changed after no more than 20 notching operations. A blade penetration speed of around 10 mm/min has been found to be satisfactory. 6 Test pieces Prepare three ring test pieces of mm length from a sample of pipe of nominal outer diamet
19、er I 40 mm, or of mm in length for pipe or nominal diameter 40 mm, ensuring that the ends of the ring are cut square. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 09:46:38 MDTNo rep
20、roduction or networking permitted without license from IHS -,-,- IS0 13480: 1997(E) 0 IS0 Manual I I ! ! .- - I ! I ! blade r Pipe - T .-.-._- L “.- Screw “1 “1 “- -2- I -, Figure 2 - Notching device Copyright International Organization for Standardization Provided by IHS under license with ISO Lice
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