1、 ISO 2012 Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 2: Pipes Systmes de canalisations en matires plastiques pour la distribution de combustibles gazeux Systmes de canalisations en polyamide
2、non plastifi (PA-U) avec assemblages par soudage et assemblages mcaniques Partie 2: Tubes INTERNATIONAL STANDARD ISO 16486-2 First edition 2012-06-01 Reference number ISO 16486-2:2012(E) ISO 16486-2:2012(E) ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 All rights reserved. Un
3、less otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO
4、 copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ISO 16486-2:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1 3 T erm
5、s, definitions, symbols and abbreviated terms 2 4 Compound . 2 5 Appearance . 2 6 Geometrical characteristics . 2 6.1 Measurement of dimensions 2 6.2 Mean outside diameters, out-of-roundness and their tolerances 2 6.3 Wall thicknesses and tolerances. 3 7 Mechanical characteristics . 4 7.1 Conditioni
6、ng . 4 7.2 Requirements . 4 8 Physical characteristics 6 8.1 Conditioning . 6 8.2 Requirements . 6 9 Marking . 6 Annex A (informative) Butt fusion procedure for jointing PA-U pipes . 8 Bibliography . 11 ISO 16486-2:2012(E) Foreword ISO (the International Organization for Standardization) is a worldw
7、ide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on th
8、at committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in
9、accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard r
10、equires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 16486-2 was prepared by Te
11、chnical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 4, Plastics pipes and fittings for the supply of gaseous fuels. This first edition of ISO 16486-2 cancels and replaces the first edition of ISO 22621-2:2007 which has been technically revis
12、ed. ISO 16486 consists of the following parts, under the general title Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing: Part 1: General Part 2: Pipes Part 3: Fittings Part 5: Fitness for purpose of the
13、 system Part 6: Code of practice for design, handling and installation iv ISO 2012 All rights reserved ISO 16486-2:2012(E) Introduction Thin wall thickness unplasticized polyamide (PA-U) pipes and solvent cement joints are used typically for low pressures, while thicker wall thickness pipes and butt
14、 fusion, electrofusion or mechanical joints are typically used for high pressures. For technical and safety reasons, it is not possible to mix the components of the two types of piping system (thin wall thickness pipes cannot be jointed by butt fusion or mechanical joints and vice versa). In particu
15、lar, solvent cement joints must not be used for jointing for high pressure piping systems. So for the time being, the standardization programme dealing with unplasticized polyamide (PA-U) piping systems for the supply of gaseous fuels is split into two series of International Standards, with one ser
16、ies (ISO 17467) covering piping systems the components of which are connected by solvent cement jointing and the other (ISO 16486) the components of which are connected by fusion jointing and/or mechanical jointing. When more experience will be gained from the field, it might be reasonable to merge
17、the ISO 17467 series and the ISO 16486 series in one single series applicable to PA-U piping systems. A similar series (ISO 17135) for fusion and mechanically jointed plasticized polyamide (PA-P) piping systems is in preparation. ISO 2012 All rights reserved v Plastics piping systems for the supply
18、of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 2: Pipes 1 Scope This part of ISO 16486 specifies the physical and mechanical properties of pipes made from unplasticized polyamide (PA-U) in accordance with ISO 16486-1, intended to be b
19、uried and used for the supply of gaseous fuels. It also specifies the test parameters for the test methods to which it refers. ISO 16486 is applicable to PA-U piping systems the components of which are connected by fusion jointing and/or mechanical jointing. In addition, it lays down dimensional cha
20、racteristics and requirements for the marking of pipes. Pipes conforming to this part of ISO 16486 are jointed typically by using mechanical, electrofusion or butt fusion (see Annex A) techniques, but not by solvent cement jointing. 2 Normative references The following documents, in whole or in part
21、, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 291, Plastics Standard atmospheres for conditio
22、ning and testing ISO 307, Plastics Polyamides Determination of viscosity number ISO 1133-2, Plastics Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics Part 2: Method for materials sensitive to time-temperature history and/or moisture ISO 1167-1, Thermop
23、lastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 1: General method ISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal pressure Part 2: Preparat
24、ion of pipe test pieces ISO 2505, Thermoplastics pipes Longitudinal reversion Test method and parameters ISO 3126, Plastics piping systems Plastics components Determination of dimensions ISO 6259-1, Thermoplastics pipes Determination of tensile properties Part 1: General test method ISO 6259-3, Ther
25、moplastics pipes Determination of tensile properties Part 3: Polyolefin pipes ISO 11922-1:1997, Thermoplastics pipes for the conveyance of fluids Dimensions and tolerances Part 1: Metric series ISO 13477, Thermoplastics pipes for the conveyance of fluids Determination of resistance to rapid crack pr
26、opagation (RCP) Small-scale steady-state test (S4 test) INTERNATIONAL STANDARD ISO 16486-2:2012(E) ISO 2012 All rights reserved 1 ISO 16486-2:2012(E) ISO 13479, Polyolefin pipes for the conveyance of fluids Determination of resistance to crack propagation Test method for slow crack growth on notched
27、 pipes ISO 16486-1:2012, Plastics piping systems for the supply of gaseous fuels Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing Part 1: General 3 T erms, definitions, s ymbols and abbreviated terms For the purposes of this document, the terms, definitions,
28、 symbols and abbreviated terms given in ISO 16486-1 apply. 4 Compound The pipes shall be made from virgin material. Rework material shall not be used. The compound from which the pipes are made shall be in accordance with ISO 16486-1. 5 Appearance When viewed without magnification, the internal and
29、external surfaces of pipes shall be smooth, clean and free from scoring, cavities and other surface defects which can affect pipe performance. The pipe ends shall be cut cleanly and square to the axis of the pipe. 6 Geometrical characteristics 6.1 Measurement of dimensions Dimensions shall be measur
30、ed in accordance with ISO 3126 at (23 2) C, after being conditioned for at least 4 h. The measurement shall not be made less than 24 h after manufacture. 6.2 Mean outside diameters, out-of-roundness and their tolerances The mean outside diameter of the pipe, d em , and the out-of-roundness and their
31、 tolerances shall be in accordance with Table 1. For maximum mean outside diameter grade B tolerances, ISO 11922-1 shall apply. Ta b l e 1 M ean o u t si d e diameter s and ou t - of - r oundness Dimensions in millimetres Nominal outside diameter Mean outside diameter M a ximum of a b so l u t e ou
32、t - of - roundn e ss a d n d em,min d em,max Grade K b Grade N 16 20 25 32 16,0 20,0 25,0 32,0 16,3 20,3 25,3 32,3 1,2 1,2 1,5 2,0 1,2 1,2 1,2 1,3 40 50 63 75 40,0 50,0 63,0 75,0 40,4 50,4 63,4 75,5 2,4 3,0 3,8 1,4 1,4 1,5 1,6 90 110 125 140 90,0 110,0 125,0 140,0 90,6 110,7 125,8 140,9 1,8 2,2 2,5
33、2,8 2 ISO 2012 All rights reserved ISO 16486-2:2012(E) Nominal outside diameter Mean outside diameter M a ximum of a b so l u t e ou t - of - roundn e ss a d n d em,min d em,max Grade K b Grade N 160 180 200 225 160,0 180,0 200,0 225,0 161,0 181,1 201,2 226,4 3,2 3,6 4,0 4,5 250 250,0 251,5 5,0 aMea
34、surement of out-of-roundness shall be made at the point of manufacture according to ISO 3126. bFor coiled pipe with d n 63 mm, grade K applies; for pipe with d n 75 mm, the maximum out-of roundness shall be specified by agreement. 6.3 Wall thicknesses and tolerances 6.3.1 Minimum wall thickness The
35、minimum wall thickness, e min , shall be in accordance with Table 2. Small diameter pipes are characterized by wall thickness. Large diameter pipes are characterized by their standard dimension ratio (SDR). The use of any SDR derived from the pipe series S given according to ISO 4065 and ISO 161-1 i
36、s permitted. NOTE In order to minimize the possibility of damage to small-diameter gas pipes by external influences, the use of pipes having a wall thickness of not less than 3,0 mm, even if higher than the minimal SDR value, can be considered. Ta b l e 2 Mini mu m wa ll thickness Dimensions in mill
37、imetres Nominal outside diameter d n Minimum wall thickness e min SDR 7,4 SDR 9 SDR 11 SDR 13,6 SDR 17 SDR 21 SDR 26 16 20 25 32 2,2 2,8 3,5 4,4 2,3 2,8 3,6 2,3 2,9 2,4 40 50 63 75 5,5 6,9 8,6 10,3 4,5 5,6 7,1 8,4 3,7 4,6 5,8 6,8 3,0 3,7 4,7 5,6 2,4 3,0 3,8 4,5 2,0 2,4 3,0 3,6 2,0 2,5 2,9 90 110 125
38、 140 12,3 15,1 17,1 19,2 10,1 12,3 14,0 15,7 8,2 10,0 11,4 12,7 6,7 8,1 9,2 10,3 5,4 6,6 7,4 8,3 4,3 5,3 6,0 6,7 3,9 4,2 4,8 5,4 160 180 200 225 21,9 24,6 27,4 30,8 17,9 20,1 22,4 25,2 14,6 16,4 18,2 20,5 11,8 13,3 14,7 16,6 9,5 10,7 11,9 13,4 7,7 8,6 9,6 10,8 6,2 6,9 7,7 8,6 250 34,2 27,9 22,7 18,4
39、 14,9 12,0 9,6 6.3.2 Tolerances on wall thickness at any point The tolerances on the wall thickness at any point shall be in accordance with ISO 11922-1:1997, Grade V. The maximum permissible variation between the nominal wall thickness, e n , and the wall thickness at any point, e, shall be in acco
40、rdance with Table 3. Ta b l e 1 (continued) ISO 2012 All rights reserved 3 ISO 16486-2:2012(E) Ta b l e 3 T oleranc es on wa ll thickness at a ny p oint Dimensions in millimetres Minimum wall thickness e min Permitted positive deviation Minimum wall thickness e min Permitted positive deviation 2,0 3
41、,0 4,0 5,0 3,0 4,0 5,0 6,0 0,4 0,5 0,6 0,7 18,0 19,0 20,0 21,0 19,0 20,0 21,0 22,0 2,0 2,1 2,2 2,3 6,0 7,0 8,0 9,0 7,0 8,0 9,0 10,0 0,8 0,9 1,0 1,1 22,0 23,0 24,0 25,0 23,0 24,0 25,0 26,0 2,4 2,5 2,6 2,7 10,0 11,0 12,0 13,0 11,0 12,0 13,0 14,0 1,2 1,3 1,4 1,5 26,0 27,0 28,0 29,0 27,0 28,0 29,0 30,0
42、2,8 2,9 3,0 3,1 14,0 15,0 16,0 17,0 15,0 16,0 17,0 18,0 1,6 1,7 1,8 1,9 30,0 31,0 32,0 33,0 31,0 32,0 33,0 34,0 3,2 3,3 3,4 3,534,0 35,0 35,0 36,0 3,6 3,7 7 Mechanical characteristics 7.1 Conditioning Unless otherwise specified by the applicable test method, the test pieces shall be conditioned for
43、at least 16 h at 23 C and 50 % relative humidity in accordance with ISO 291 before testing in accordance with Table 4. 7.2 Requirements The test pieces shall be tested in accordance with Table 4. When tested using the test method and parameters specified therein, the pipe shall have mechanical chara
44、cteristics conforming to the requirements of Table 4. Ta b l e 4 M echanic al cha r ac t er i st ic s Characteristic Requirement Test parameters Test method(s) Parameter Value Hydrostatic strength at 20 C for 1 000 h No failure of any test piece during test period End caps Type a) ISO 1167-1 ISO 116
45、7-2 Orientation Free Conditioning period 6 h Type of test Water-in-water Test temperature 20 C Test period 1 000 h Circumferential (hoop) stress: PA-U 11 160 and PA-U 12 160 a 19,0 MPa PA-U 11 180 and PA-U 12 180 a 20,0 MPa 4 ISO 2012 All rights reserved ISO 16486-2:2012(E) Characteristic Requiremen
46、t Test parameters Test method(s) Parameter Value Hydrostatic strength at 80 C for 165 h No failure of any test piece during test period End caps Type a) ISO 1167-1 ISO 1167-2 Orientation Free Conditioning period 6 h Type of test Water-in-water Test temperature 80 C Test period 165 h Circumferential
47、(hoop) stress: PA-U 11 160 and PA-U 12 160 a 10,0 MPa PA-U 11 180 and PA-U 12 180 a 11,5 MPa Elongation at break 200 % Test speed 25 mm/min ISO 6259-1 ISO 6259-3 Melt volume rate (MVR) b5 mm (notch test) No failure during the test period Test temperature 80 C ISO 13479 SDR 11 Type of test Water-in-w
48、ater Test period 500 h Test pressure: PA-U 11 160 and PA-U 12 160 a 18 bar c PA-U 11 180 and PA-U 12 180 a 20 bar c Resistance to rapid crack propagation (critical pressure, p c,S4 ) (S4 test) p c,S4 0,9p c,S4,REF de Test temperature 0 C ISO 13477 a For material classification and designation, see I
49、SO 16486-1, 5.4. b It is essential that the water content of the sample be 0,1 %, because PA-U resin is sensitive to hydrolyses. Therefore, the test sample shall be dried prior to testing at 80 C in a dry air or vacuum dryer for 3 h, or as recommended by the PA-U resin producer. c Test pressure levels for other SDR are given in Table 5. d p c,s4,REFis the value of the critical pressure determi
