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 978-0-626-19246-4 SANS 921:2009 Edition 3.1 Any reference to SABS 921 is deemed to be a reference to this standard (Government Notice No. 1373 of 8
4、November 2002)SOUTH AFRICAN NATIONAL STANDARD Pitch-impregnated fibre pipes and fittings and jointing Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS This standard may only be used and prin
5、ted by approved subscription and freemailing clients of the SABS.SANS 921:2009 Edition 3.1 Table of changes Change No. Date Scope Amdt 1 2009 Amended to change the designation of SABS standards to SANS standards, to update the definition of “acceptable”, to delete reference to the certification mark
6、, and to update referenced standards. Foreword This South African standard was approved by National Committee SABS TC 59, Construction standards, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in February
7、 2009. This document supersedes SABS 921:1994 (edition 3). A vertical line in the margin shows where the text has been technically modified by amendment No. 1. Drawings included in this document are of a schematic nature and should not be accepted as working drawings. Annex A forms an integral part
8、of this document. Annexes B, C and D are for information only. This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 921:2009 Edition 3.1 1 Contents Page Foreword 1 Scope . 3 2 Normative reference 3 3 Definitions 3 4 Requirements . 3 5 Packing a
9、nd marking . 10 6 Inspection and methods of test 11 6.1 Inspection 11 6.2 Dimensions 11 6.3 Tightness of joints in pipes with solid walls. 11 6.4 Resistance to moisture absorption . 12 6.5 Resistance to boiling water. 13 6.6 Resistance to heat 13 6.7 Dry crushing strength of pipes 13 6.8 Wet crushin
10、g strength of pipes. 14 6.9 Beam strength of pipes. 15 6.10 Test of adhesive used in fabricated fittings 16 6.11 Polypropylene couplings. 16 Annexes A Notes to purchasers 19 B Quality verification of pitch-impregnated fibre pipes and fittings and jointing. 19 C Specific material properties of polypr
11、opylene 20 D Bibliography . 21 This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 921:2009 Edition 3.1 2 This page is intentionally left blank This standard may only be used and printed by approved subscription and freemailing clients of the
12、SABS.SANS 921:2009 Edition 3.1 3 Pitch-impregnated fibre pipes and fittings and jointing 1 Scope This standard specifies the dimensional and minimum quality requirements for pitch-impregnated fibre pipes (known as pitch fibre pipes) of nominal diameter 75 mm, 100 mm and 150 mm, together with pitch f
13、ibre fittings and polypropylene and polyethylene couplings, that are suitable, when they have solid walls, for use as cable conduit and when they have perforated walls, for subsoil drainage. NOTE Assessment of compliance with the requirements of 4.11.2 for perforated pipes shall be the subject of a
14、special agreement between the manufacturer and the purchaser. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this standard. All standards are subject to revision and, since any reference to a standard is deemed to be a
15、 reference to the latest edition of that standard, parties to agreements based on this standard are encouraged to take steps to ensure the use of the most recent edition of the standard indicated below. Information on currently valid national and international standards can be obtained from the SABS
16、 Standards Division. SANS 892, General purpose detergent (beads, granules and powders). 3 Definitions For the purposes of this standard, the following definitions apply: 3.1 acceptable acceptable to the authority administering this standard, or to the parties concluding the purchase contract, as rel
17、evant Amdt 1 3.2 defective a length of pipe, a coupling, a fitting, a test unit or a test specimen that fails in one or more respects to comply with the appropriate requirements of the standard 4 Requirements 4.1 Materials 4.1.1 Pipes Pipes shall consist of a preformed felted fibrous structure impre
18、gnated with a suitable coal tar pitch, such as a) coke-oven pitch (referred to as high temperature pitch), or This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 921:2009 Edition 3.1 4 b) medium temperature pitch, as obtained from the “oil fro
19、m coal“ gasification process, or both. 4.1.2 Couplings and fittings Fittings shall be of the same material as the pipe. Couplings shall be of one of the following materials, as appropriate to the type of coupling, and as required: a) an acceptable polypropylene (see annex C); or b) an acceptable pol
20、yethylene. 4.1.3 Adhesives Adhesives used in fabricated fittings (see 4.12.2) shall produce joints that are not inferior to the pipe material with respect to resistance to moisture absorption (see 4.6) and resistance to boiling water (see 4.7). 4.2 Classes and types 4.2.1 Pipes Pipes shall be of cla
21、ss 1, class 2 or class 3 (table 3), as required, and shall have solid walls or perforated walls, as required. 4.2.2 Couplings Couplings shall be of either the tapered polypropylene type or the plain polyethylene type, as required (see figure 5). 4.2.3 Fittings Fittings shall be radius bends, segment
22、al bends, junctions or channel junctions, as required. 4.3 Dimensions 4.3.1 Pipes 4.3.1.1 The nominal length of a pipe, when determined in accordance with 6.2.1, shall be within the limits indicated in table 1 and as required. Table 1 Nominal lengths Dimensions in metres 1 2 3 Nominal length Maximum
23、 length Minimum length 3,00 2,85 2,70 2,55 2,40 3,05 2,90 2,75 2,60 2,45 2,95 2,80 2,65 2,50 2,35 This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 921:2009 Edition 3.1 5 4.3.1.2 The pipes shall be of nominal size 75 mm, 100 mm or 150 mm, an
24、d the ends shall be tapered or as required. The dimensions of a tapered end shall conform to the appropriate values given in columns 4 to 12 of table 2. 4.3.1.3 The internal diameter of a pipe shall, when measured in accordance with 6.2.2, conform to the appropriate values given in columns 2 and 3 o
25、f table 2. Table 2 Dimensions of pipes 1 2 3 4 5 6 7 8 9 10 11 12 Nominal internal diameter Nominal length of taper Minimum wall thickness at end of taper Taper angle Nominal pipe size mm mm mm degrees mm Min. Max. Class 1 Class 2 Class 3 Class 1 Class 2 Class 3 Class 1 Class 2 Class 3 75 75 80 37,5
26、 25 1,75 1,75 2 1 100 100 108 50 50 37,5 2,5 1,75 1,75 2 2 1 150 150 160 50 50 5 3,5 2 2 4.3.2 Couplings and fittings The nominal sizes of couplings and fittings shall be 75 mm, 100 mm or 150 mm, as required. 4.4 Internal finish The bore of the pipes and fittings shall be smooth and free from protru
27、sions that project more than 3 mm above the surrounding surface. 4.5 Tightness of joints in pipes with solid walls When a joint is tested in accordance with 6.3, it shall show no sign of leakage. 4.6 Resistance to moisture absorption The moisture absorption of a pipe or a fitting, determined in acco
28、rdance with 6.4, shall not exceed 5 % by mass. 4.7 Resistance to boiling water When a pipe or a fitting is tested in accordance with 6.5, it shall show no evidence of structural disintegration or separation into laminations and the dry crushing strength of the pipe, determined in accordance with 6.7
29、, shall be at least equal to the appropriate value given in table 3. This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 921:2009 Edition 3.1 6 Table 3 Crushing strength of pipes 1 2 3 4 Minimum crushing strength per metre length of pipe Nomin
30、al pipe size kN mm Class 1 Class 2 Class 3 75 8 5 100 16,5 8,25 5 150 19,0 9,5 4.8 Resistance to heat When a pipe or a fitting is tested in accordance with 6.6, there shall be no appreciable exudation of the impregnant. 4.9 Crushing strength of pipes The dry and wet crushing strengths of a pipe, det
31、ermined in accordance with 6.7 and 6.8 respectively, shall be not less than the value given in table 3, appropriate to the class of the pipe tested. 4.10 Beam strength of pipes When a pipe is tested in accordance with 6.9, it shall withstand the appropriate load given in table 4 without any sign of
32、cracking or other failure. Table 4 Beam strength of pipes 1 2 3 4 5 6 Load Nominal pipe size Length Span kN mm mm mm Class 1 Class 2 Class 3 75 800 600 2,7 2,2 100 800 600 8,5 5,5 4,4 150 1 100 900 17 11 4.11 Perforated pipes 4.11.1 Perforations When perforated pipes are required, they shall, unless
33、 otherwise required, be perforated as follows: a) perforations shall be cleanly cut and evenly spaced in rows parallel to the axis of the pipe, as shown in figure 1; This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 921:2009 Edition 3.1 7 b)
34、 perforations shall be holes of diameter not exceeding 10 mm, or equivalent area, and the spacing between the centre-lines of adjacent holes in a row shall be 75 mm 10 mm; c) there shall be two rows of holes in pipes of nominal size 75 mm and 100 mm and four rows of holes in pipes of nominal size 15
35、0 mm; and d) the centre-lines of all perforations shall be contained within an arc of between 100 and 160 (see figure 1). 4.11.2 Other requirements Perforated pipes shall be produced from pipes of the type with solid walls. Before perforation, these pipes shall have complied with the relevant requir
36、ements of the standard. 4.12 Specific requirements for fittings 4.12.1 General 4.12.1.1 Fittings shall have been either moulded to shape or fabricated from a pipe. 4.12.1.2 Fittings for class 1 and class 2 pipes shall be interchangeable. 4.12.1.3 Pipes used in the fabrication of the fittings shall c
37、omply with all the relevant requirements of the standard. NOTE Rows of perforations may also be staggered. Figure 1 Typical arrangement of holes in perforated pipes 4.12.1.4 Ends of fittings shall be tapered or plain, as required. The dimensions of a tapered end shall conform to the appropriate valu
38、es given in columns 4 to 12 of table 2 for pipes. NOTE Typical fittings are illustrated in figures 2, 3 and 4. This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 921:2009 Edition 3.1 8 Nominal diameter D Nominal angle mm degrees 100 22,5 45 9
39、0 150 22,5 45 Figure 2 Radius bends Nominal diameter D Nominal angle mm degrees 100 and 150 22,5 45 90 Figure 3 Segmental bends This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 921:2009 Edition 3.1 9 Nominal diameter of fitting mm Nominal a
40、ngle D D 1degrees 75 75 100 100 100 100 150 150 150 150 75 75 75 75 100 100 100 100 150 150 45 90 45 90 45 90 45 90 45 90 Figure 4 Junctions and channel junctions 4.12.2 Adhesive used in fabricated fittings When a jointed specimen is tested in accordance with 6.10, it shall withstand, without fractu
41、re of the joint, one impact of the masspiece. 4.12.3 Internal diameter When a fitting is tested in accordance with 6.2.3, a ball of the appropriate diameter given in table 5 shall pass freely through the fitting. Table 5 Nominal diameter of ball 1 2 3 Nominal size of fitting Nominal diameter of ball
42、 Type of fitting mm mm Radius bends 100 150 85 135 Segmental bends, junctions and channel junctions 75 100 150 70 95 145 This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 921:2009 Edition 3.1 10 4.13 Requirements for polypropylene couplings
43、4.13.1 Resistance to impact When a polypropylene coupling is tested in accordance with 6.11.1, it shall show no evidence of open or closed cracking on either the inside or the outside surface. 4.13.2 Tensile strength of weld line When a polypropylene coupling is tested in accordance with 6.11.2, it
44、shall show no sign of cracking or splitting. 4.13.3 Resistance to heat When a polypropylene coupling is tested in accordance with 6.11.3, it shall show no sign of splitting or blistering. 4.13.4 Taper The taper of a polypropylene coupling shall match that of the pipes and fittings to which it is int
45、ended to be connected (see columns 4 to 12 of table 2). 5 Packing and marking 5.1 Marking of pipes Each pipe shall bear the following information in legible and indelible marking: a) the manufacturers name, or trade name, or other identification; b) the date of manufacture, or a batch number related
46、 to the date of manufacture; and c) the class. 5.2 Packing and marking of couplings Unless otherwise required, enough couplings to provide one coupling for each pipe in the consignment shall be packed in suitable containers, and each container shall bear the following information in legible and inde
47、lible marking: a) the manufacturers name, or trade name, or other identification; b) the date of manufacture, or a batch number related to the date of manufacture; and c) the size and the number of couplings in the container. 5.3 Marking of fittings Each fitting and, when applicable, each container
48、of fittings, shall bear the following information in legible and indelible marking: a) the manufacturers name, or trade name, or other identification; b) the date of manufacture, or a batch number related to the date of manufacture; and c) in the case of containers, the type and the number of fittin
49、gs in the container. This standard may only be used and printed by approved subscription and freemailing clients of the SABS.SANS 921:2009 Edition 3.1 11 6 Inspection and methods of test 6.1 Inspection Inspect each pipe, fitting and coupling in the sample for compliance with those requirements of the standard for which tests to assess compliance are not given in 6.2 to 6.11 (inclusive). 6.2 Dimensions 6.2.1 Length of pipes 6.2.1.1 Measure, to the nearest 5 mm, the overall length of each pipe in the sample. 6.2.1.2 Check for compliance wit
