1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21936-9 SANS 9852:2008Edition 2ISO 9852:2007Edition 2SOUTH AFRICAN NATIONAL STANDARD Unplasticized poly(vinvyl chloride) (PVC-U) pipes Dic
4、hloromethane resistance at specified temperature (DCMT) Test method This national standard is the identical implementation of ISO 9852:2007 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Priv
5、ate Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 9852:2008 Edition 2 ISO 9852:2007 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS SC 138H, Water and sanitation Equipmen
6、t and systems Plastics pipes and fittings, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in September 2008. This document supersedes SABS ISO 9852:1995 (edition 1). Reference numberISO 9852:2007(E)ISO 20
7、07INTERNATIONAL STANDARD ISO9852Second edition2007-05-01Unplasticized poly(vinyl chloride) (PVC-U) pipes Dichloromethane resistance at specified temperature (DCMT) Test method Tubes en poly(chlorure de vinyle) non plastifi (PVC-U) Rsistance au dichloromthane une temprature spcifie (DCMT) Mthode dess
8、ai SANS 9852:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 9852:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edi
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13、opyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All rights reservedSANS 9852:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 9852:2007(E) ISO 2007 All rights reserved iiiContents Page Foreword iv Introduction v 1
14、Scope . 1 2 Principle. 1 3 Reagent 1 4 Apparatus 2 5 Preparation of test pieces 2 6 Immersion conditions. 3 7 Procedure 3 8 Expression of results . 3 9 Test report . 4 Annex A (informative) Description of attack 5 Annex B (informative) Example of small container placed in an existing (larger) contai
15、ner . 6 SANS 9852:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 9852:2007(E) iv ISO 2007 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS
16、O 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 that committee. International organizations, gove
17、rnmental 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 accordance with the rules given in the ISO/IEC
18、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 requires approval by at least 75 % of the member
19、 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 9852 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fitt
20、ings and valves for the transport of fluids, Subcommittee SC 5, General properties of pipes, fittings and valves of plastic materials and their accessories Test methods and basic specifications . This second edition cancels and replaces the first edition (ISO 9852:1995), which has been revised to al
21、ign it with EN 580:2003. The principal modifications are the following: the wall thickness ranges “8 u e u 16” and “e 16” in Table 1 have been changed to “8 u e 16” and “16 u e”, respectively, to align them with those in EN 580:2003; the surface of the dichloromethane layer has been reduced to the m
22、inimum and the thickness of the water layer covering the dichloromethane increased (see 6.2); after immersion in the dichloromethane, the test piece is held in the water layer to allow it to “drip” before final drying and inspection (see 7.4); in the event of the pipe being attacked (see 8.2), givin
23、g a description of the attack has become optional, dealt with in a new Annex A (informative). the lower limit for the test temperature (12 C) has been moved to 6.3, and Annex A, “Basic specification”, has been deleted; a typical test arrangement, with the deeper water layer (acting both as a block t
24、o evaporation and as a “drip” zone), is shown in a new Annex B. These modifications allow the consumption of dichloromethane to be reduced, thus improving the environment for the staff conducting the test without reducing the number of tests. Experience has shown that this modified procedure and tes
25、t arrangement can result in a reduction of dichloromethane consumption of more than 90 %. SANS 9852:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 9852:2007(E) ISO 2007 All rights reserved vIntroduction The maximum temperature at whi
26、ch unplasticized poly(vinyl chloride) (PVC-U) pipe is not attacked by dichloromethane gives an indication of the level and homogeneity of gelation of the PVC material in the pipe. This characteristic is related to the mechanical properties and, in particular, the long-term performance of the pipe. S
27、ANS 9852:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SANS 9852:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 9852:2007(E) ISO 2007 All rights r
28、eserved 1Unplasticized poly(vinyl chloride) (PVC-U) pipes Dichloromethane resistance at specified temperature (DCMT) Test method 1 Scope This International Standard specifies a method for determining the resistance of unplasticized poly(vinyl chloride) (PVC-U) pipes to dichloromethane at a specified
29、 temperature (DCMT). It is applicable to all PVC-U pipes, irrespective of their intended use. The method can be used as a rapid means of quality control during manufacture. NOTE The temperature of the dichloromethane up to which the pipe shall not be attacked is specified in the referring standard.
30、2 Principle A piece of PVC-U pipe, of specified length, chamfered at one end to an angle dependent on its thickness, is immersed for (30 1) min in dichloromethane, at a temperature T specified by the referring standard, to verify that the PVC-U is not attacked at that temperature. For safety reasons
31、, the surface area of the dichloromethane is kept to the minimum and the dichloromethane is covered by a deep layer of water to reduce evaporation. After immersion in the dichloromethane, the test piece is held in the water layer to allow it to “drip” before final drying and inspection. NOTE 1 If th
32、e PVC-U has not sufficiently gelled, whitening of the surface will occur and, in the worst case, a precipitate will be observed. NOTE 2 It is assumed that the following test parameters are set by the standard making reference to this International Standard: a) the temperature T of the dichloromethan
33、e (see 4.3 and 6.3); b) the minimum wall thickness for which the test can be used; c) the number of test pieces, if appropriate (see 5.1). 3 Reagent 3.1 Dichloromethane, technical grade. NOTE Technical-grade dichloromethane contains small quantities (at the most, 1 % of each) of chloromethane (CH3Cl
34、), trichloromethane (CHCl3) and tetrachloromethane (CCl4). It has been noted that, even if the level of these impurities reaches 5 % in total, the results are not significantly affected. WARNING The boiling point of dichloromethane is low (40 C). Consequently, it has a high vapour pressure at ambien
35、t temperature. Further, it can be toxic by absorption through the skin and eyes. It is therefore necessary to take precautions when handling dichloromethane or test pieces which have been immersed in it. The vapour is also toxic, the threshold limit value (TLV) corresponding to the maximum admissibl
36、e concentration (MAC) being 100 ml/m3 (ppm). Ventilation of the room or area in which the container is located and where the test pieces are dried is therefore essential. SANS 9852:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 9852:
37、2007(E) 2 ISO 2007 All rights reserved4 Apparatus 4.1 Chamfering machine (see 5.2). 4.2 Glass or stainless-steel container, of suitable dimensions to accommodate at least one test piece (see Clause 5), with a grating maintained at a depth approximately 10 mm above the bottom of the container, a lid
38、to limit evaporation of the liquid (see 6.1 and 6.2) and temperature-control equipment, with a stirrer, capable of maintaining the temperature of the liquid at (T 0,5) C with the help of the cooling equipment (4.3). NOTE It is recommended that a cylindrical container be used of a suitable small diam
39、eter, e.g. slightly greater than 315 mm but chosen to suit the dimensions of the most frequently produced pipe size (larger pipes can be cut into a number of longitudinal sections to be fitted into the container, see 5.1). In laboratories which previously used a larger container for this test, the c
40、ontainer specified here can be placed in the old container, which can be filled with water (see Annex B). Provided the new container is sufficiently small and made from a heat-conducting material like stainless steel, the temperature-control equipment and stirrer can be located in the old vessel. Th
41、e grating shall be designed so it can be positioned at two different levels as follows: a) with the appropriate parts of the test pieces or test piece sections immersed in the dichloromethane; b) with the parts of the test pieces or test piece sections which were immersed in the dichloromethane comp
42、letely surrounded by water but not in contact with the dichloromethane. 4.3 Cooling equipment, capable of cooling the dichloromethane to the temperature specified in the referring standard. 4.4 Hood fitted with a fume extraction system, mounted for safety reasons (see warning in Clause 3) over the c
43、ontainer (4.2). 5 Preparation of test pieces 5.1 Cut from the pipe to be tested test pieces 160 mm in length, such that the cut ends are perpendicular to the axis of the pipe. Unless otherwise specified by the referring standard, the number of test pieces shall be three. The wall thickness of the pi
44、pe shall be greater than the minimum thickness specified for this test by the referring standard see item b) of Note 2 to Clause 2. 5.2 Chamfer, by cutting (see Note) without producing any appreciable heating effect, one of the ends of each test piece over its entire wall thickness (see Figure A.1).
45、 The angle of chamfer shall be chosen as a function of the wall thickness of the pipe as specified in Table 1. NOTE The term “cutting” has been used to exclude grinding. Table 1 Angles of chamfer Pipe wall thickness, e mm Angle of chamfer, degrees e 8 10 8 u e 16 20 16 u e 30 SANS 9852:2008This s ta
46、ndard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 9852:2007(E) ISO 2007 All rights reserved 35.3 If the test pieces are larger than the diameter of the container, cut each test piece into a number of longitudinal sections. The maximum width of the s
47、aw blade used shall be 2,5 mm. The number of sections into which each test piece is cut shall be the lowest possible number, i.e. the maximum possible size, allowed by the size of the container. 5.4 Cool the test pieces or test piece sections to ambient temperature. 6 Immersion conditions 6.1 Fill t
48、he container with dichloromethane of known refractive index to a depth sufficient to completely cover the chamfered zone of the test pieces or test piece sections. 6.2 Cover the dichloromethane with a layer of water preferably 250 mm to 300 mm deep, but not less than 20 mm deep. 6.3 Using the temper
49、ature control, cooling equipment and stirrer, establish and maintain the temperature of the dichloromethane in the container at (T 0,5) C see item a) of Note 2 to Clause 2. This temperature shall not be less than 12 C. 6.4 Between tests, add dichloromethane as necessary to maintain the level of the dichloromethane in the container. 6.5 Ensure that the refractive index of the dichloromethane does not vary during use by more than 0,002 from its initial value. NOTE In practice, the refractiv
