amd13467 fm BRITISH STANDARD BS EN 512 1995 Incorporating Amendment No 1 Fibre cement products — Pressure pipes and joints The European Standard EN 512 1994, with the incorporation of amendment A1 200[.]
BRITISH STANDARD Fibre-cement products — Pressure pipes and joints The European Standard EN 512:1994, with the incorporation of amendment A1:2001, has the status of a British Standard UDC 621.643.2: 621.643.05: 621.1/.3: 666.961 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 512:1995 Incorporating Amendment No BS EN 512:1995 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee B/504, Water supply, upon which the following bodies were represented: Association of Consulting Engineers Association of Manufacturers of Domestic Unvented Supply Systems Equipment (MODUSSE) British Bathroom Council British Foundry Association British Non-ferrous Metals Federation British Plastics Federation British Plumbing Fittings Manufacturers’ Association Department of the Environment Department of the Environment (Drinking Water Inspectorate) Fibre Cement Manufacturers’ Association Limited Institute of Plumbing Institution of Water and Environmental Management Local Authority Organizations Scottish Association of Directors of Water and Sewerage Services Water Companies Association Water Research Centre Water Services Association of England and Wales The following bodies were represented in the drafting of the standard, through subcommittees and panels: Association of Metropolitan Authorities British Precast Concrete Federation Ltd Concrete Pipe Association Concrete Society Department of Transport Federation of Civil Engineering Contractors Institution of Civil Engineers Institution of Highways and Transportation This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 August 1995 © BSI 23 January 2002 The following BSI references relate to the work on this standard: Committee reference B/504 Draft for comment 91/14764 DC ISBN 580 24217 X Amendments issued since publication Amd No Date Comments 13467 23 January 2002 Additions to Annex C BS EN 512:1995 Contents Committees responsible National foreword Foreword Text of EN 512 © BSI 23 January 2002 Page Inside front cover ii i BS EN 512:1995 National foreword This British Standard has been prepared by Technical Committee B/504 and is the English language version of EN 512:1994 Fibre-cement products — Pressure pipes and joints, including amendment A1:2001, published by the European Committee for Standardization (CEN) EN 512 was published as a result of international discussion in which the UK took an active part This standard supersedes BS 486:1990 which is withdrawn as a result of this publication This standard together with a number of other ENs will form a comprehensive series of standards in the field of concrete pressure pipes The manufacture of all asbestos products is covered by the requirements of The Control of Asbestos at Work Regulations 1987, introduced on March 1988 These set out comprehensive provisions covering work activities involving exposure to asbestos Advice on how to comply with these regulations can be obtained from the manufacturers of the material, from the Asbestos Information Centre Ltd, Derby Road, Cheshire WH8 9ND, from the local area office of the Health and Safety Executive or from the Environmental Health Department of the Local Authority WARNING Breathing asbestos dust is dangerous to health and precautions have to be taken during the manufacture and use of these products Particular note has to be taken of the Asbestos Products (Safety) Regulations 1985, made under the Consumer Safety Act 1978, and of the Asbestos (Prohibitions) (Amendment) Regulations 19881), made under the Health and Safety at Work etc Act 1974, which prohibit the supply of products containing amosite or crocidolite and set out requirements for the labelling of all products containing asbestos All the above legislation implements EEC Directives Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages to 23 and a back cover The BSI copyright notice displayed in this document indicates when the document was last issued 1) ii Parallel regulations for Northern Ireland came into force on March 1986 © BSI 23 January 2002 EUROPEAN STANDARD EN 512 NORME EUROPÉENNE August 1994 + A1 EUROPÄISCHE NORM August 2001 UDC 621.643.2: 621.643.05: 621.1/.3: 666.961 Descriptors: Water distribution, pressure pipes, asbestos cement products, pipes, tubes, joints, classification, characteristics, dimensions, tests, marking English version Fibre-cement products — Pressure pipes and joints (includes amendment A1:2001) Produits en fibre-ciment — Tuyaux pression et joints (inclut l’amendement A1:2001) Faserzement-Produkte — Druckrohre und Verbindungen (enthält Änderung A1:2001) This European Standard was approved by CEN on 1994-08-09 Amendment A1:2001 was approved by CEN on 2001-06-23 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1994 Copyright reserved to CEN members Ref No EN 512:1994 + A1:2001 E EN 512:1994 Foreword Foreword to amendment A1 This European Standard has been prepared under a mandate given to CEN by the Commission of the European Communities and the European Free Trade Association, and supports essential requirements of EC Directive(s) This amendment EN 512:1994/A1:2001 to the EN 512:1994 has been prepared by Technical Committee CEN/TC 164, Water supply, the Secretariat of which is held by AFNOR This European Standard was prepared by Working Group under the direction of CEN Technical Committee CEN/TC 164, Water supply, the Secretariat of which is held by AFNOR This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2002, and conflicting national standards shall be withdrawn at the latest by February 2002 This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 1995, and conflicting national standards shall be withdrawn at the latest by February 1995 This amendment to the European Standard EN 512:1994 has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirement of EU Directives(s) This standard will be brought in line with prEN 805 Water supply — Requirements for external systems and components, prepared by CEN/164/WG 1, when issued According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom In this standard a distinction has been made between product appraisal (type tests) and routine quality control requirements (acceptance tests) Attention is drawn to the need for observance of EC and/or EFTA and national legal requirements restricting the use of certain materials and to the related marking and labelling requirements Fibre-cement pressure pipes and joints which are in permanent or in temporary contact with water intended for human consumption shall not adversely affect the quality of the drinking water and not contravene the EC Directives and EFTA Regulations on the quality of drinking water The performance of a network constructed with these products depends not only on the properties of the product as required by this standard, but also on the design, construction and performance of the network as a whole in relation to the environment and conditions of use (standards covering these matters are in preparation) According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom © BSI 23 January 2002 EN 512:1994 Contents Foreword Scope Normative references Definitions 3.1 nominal diameter (DN) 3.2 nominal pressure (PN) 3.3 test pressure in factory (PT) 3.4 bursting pressure (PB) 3.5 acceptance test 3.6 type test 3.7 acceptable quality level (AQL) Pipes 4.1 Composition 4.2 Classification 4.3 General appearance and finish 4.4 Smoothness of internal surface 4.5 Characteristics 4.6 Test methods 4.7 Marking Joints 5.1 Material 5.2 Geometrical characteristics 5.3 Special joints 5.4 Physical characteristics — watertightness 5.5 Watertightness test 5.6 Marking Special applications Quality control 7.1 Factory quality control 7.2 Third party certification 7.3 Inspection of a consignment of finished products © BSI 23 January 2002 Page Page 4 4 4 5 5 5 6 10 15 16 16 16 16 Annex A (normative) Receiving inspection for products which are not subject to third party certification Annex B (informative) Working on-site Annex C (informative) A-deviations Figure — Nominal dimensions Figure — Measurement of the straightness Figure — Length of the press blocks Figure — Bending test machine Table — Pressure classification Table — Pressure relationship Table — Nominal diameters (DN) Table — Tolerances on thickness in millimetres Table — Tolerances on straightness Table — Minimum breaking loads Table — Test piece lengths Table — Width of the upper press block Table — Minimum sampling schemes 19 19 20 11 14 15 6 9 12 13 18 16 16 17 17 17 17 18 18 EN 512:1994 Scope This standard specifies the characteristics of fibre-cement pipes and joints for use under pressure for conveying potable and non potable water and sewage It is concerned with composition, classification, geometrical, mechanical and physical characteristics, acceptance tests and type tests NOTE Other media may be conveyed provided it is compatible with the fibre-cement pipes and joints A full discussion should take place between the customer and the manufacturer to determine if the pipes and joints need additional protection Normative references This European standard incorporates by dated or undated reference, provisions from other publications These normative references are cited at the appropriate places in the text and the publications are listed hereafter For dated references, subsequent amendments to or revisions of any of these publications apply to this European standard only when incorporated in it by amendment or revision For undated references the latest edition of the publication referred to applies ENV 197-1:1992, Cement — Composition, specifications and conformity criteria — Part 1: Common cements prEN 805, Water supply — Requirements for external systems and components prEN 1295, Structural design of buried pipelines under various conditions of loading EN 29001:1990, Quality systems — Model for quality assurance in design, development, production, installation and servicing EN 29002:1990, Quality systems — Model for quality assurance in production and installation ISO 390:1993, Products in fibre reinforced cement — Sampling and inspection ISO 2785:1986, Directives for selection of asbestos-cement pipes subject to external loads with or without internal pressure ISO 2859-1:1989, Sampling procedures for inspection by attributes — Part 1: Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection ISO 3951:1989, Sampling procedures and charts for inspection by variables for percent non-conforming ISO 7337:1984, Asbestos reinforced cement products — Guidelines for on-site work practices Definitions For the purposes of this standard the following definitions apply 3.1 nominal diameter (DN) a numerical designation of size of a component, which is a convenient round number approximately equal to the manufacturing dimension in mm of the internal diameter 3.2 nominal pressure (PN) a numerical designation of pressure used for reference purposes related to the mechanical characteristics of a component 3.3 test pressure in factory (PT) value of the hydrostatic pressure to which the components are tested in the factory according to 4.6.4 3.4 bursting pressure (PB) value of the hydrostatic pressure at which a component fails when tested in the factory according to 4.6.5 © BSI 23 January 2002 EN 512:1994 3.5 acceptance test test to establish whether a batch of products conforms to a specification The tests are performed on samples drawn either from continuous production or from a consignment NOTE Test methods, specification and limit values are given in this standard Sampling levels and acceptance criteria are defined in ISO 390 3.6 type test test carried out for the approval of a new product and/or when a fundamental change is made in formulation and/or method of manufacture the effects of which cannot be predicted on the basis of previous experience the test is performed on the as delivered product; it is required to demonstrate conformity of the generic product to a specification but is not required for each production batch 3.7 acceptable quality level (AQL) the quality level which, in a sampling plan corresponds to a specified and relatively high probability of acceptance It is the maximum percent defective (or maximum number of defects per 100 units) that for purposes of sampling inspection can be considered satisfactory as a process average NOTE A sampling scheme with an AQL of % means that batches containing up to % defective items have a high probability of acceptance Pipes 4.1 Composition Fibre-cement pipes shall consist essentially of cement or a calcium silicate formed by a chemical reaction of a siliceous and calcareous material reinforced by fibres The cement shall comply with relevant national standards of CEN members and/or ENV 197-1 NOTE Other components which are compatible with the composite and have no negative influence on the performance in use of the product, may be added Two types of fibre reinforced cement pipes are included in this standard: — type AT (Asbestos Technology) for products the formulation of which contains chrysotile asbestos; — type NT (Non-asbestos Technology) for products reinforced by other fibres and not containing asbestos For pipes of type AT, all the requirements of this standard shall be fulfilled For pipes of type NT, all the requirements of this standard shall be fulfilled and, in addition, evidence of long term performance of the product shall be given by a technical agreement 4.2 Classification 4.2.1 Pipes of nominal diameter up to DN 000 Pipes of nominal diameter up to DN 000 are classified according to the nominal pressure (PN) given in Table The relationship between the bursting pressure (PB) expressed in hundred of kilopascals (bars) and the nominal pressure (PN) and the relationship between the test pressure in the factory (PT) expressed in hundred of kilopascals (bars) and the nominal pressure (PN) shall be not less than the values indicated in Table The purchaser’s engineer shall decide upon the nominal pressure of pipe to be used in relation to the hydraulic working pressure and other conditions of laying and of operation he has determined Pipes subjected to external loads shall be calculated according to the relevant national standard transposing the corresponding EN standard if existing, failing this to ISO 2785 © BSI 23 January 2002 EN 512:1994 4.2.2 Pipes of nominal diameters exceeding DN 000 Pipes of nominal diameters exceeding DN 000 are not classified in the same way as defined in 4.2.1 They are designed to suit specific requirements of any particular pipeline The purchaser’s engineer shall provide the manufacturer with all required data for the design of a suitable pipe The design shall take into account the external loads according to the relevant national standard transposing the corresponding EN standard if existing, failing this to ISO 2785 and shall be subject to the approval of the purchaser’s engineer The relationship between the bursting pressure (PB) expressed in hundred of kilopascals (bar) and the nominal pressure (PN) shall not be less than 2,5 and the relationship between the test pressure (PT) in the factory expressed in hundreds of kilopascals (bar) and the nominal pressure (PN) shall not be less than 1,67 4.3 General appearance and finish The pipes shall be straight, uniform and regular The shape of the finished ends shall be fixed by the manufacturer to suit the type of joint used NOTE The ends may be machined on their outer surfaces (see Figure 1) The end faces shall be free from breakout and machining burrs The parts of the pipe where the rubber jointing rings are located shall be free from irregularities which could affect the watertightness of the joint NOTE If necessary, the pipes may be impregnated and/or coated internally and/or externally to meet special working conditions as agreed between manufacturer and customer The coating and finish should comply with the relevant national standards (transposing the EN standard), if existing Table — Pressure classification PN (2,5) (7,5) (9) 10 (12) (12,5) (15) 16 (17,5) (20) NOTE The preferred nominal pressures are without brackets Pipes of higher nominal pressure can be delivered by agreement between manufacturer and purchaser Table — Pressure relationship DN from 50 to 100 from 125 to 200 from 250 to 500 from 600 to 000 PB/PN 4,0 3,5 3,0 2,5 PT/PN 2,0 2,0 2,0 1,67 4.4 Smoothness of internal surface The internal surface of the pipe shall be regular and smooth Slight scratches, indentations or small protrusions that not affect the intended use or efficiency shall be acceptable © BSI 23 January 2002 EN 512:1994 4.6 Test methods 4.6.1 General All the tests on the characteristics mentioned in 4.5 are acceptance tests The tests shall be carried out at the manufacturer’s works on pipes as delivered, or on test specimens cut off pipes, the maturity of which is guaranteed by the manufacturer However, for geometrical characteristics the manufacturer may carry out the tests at an earlier stage of maturity, as part of the routine quality control system 4.6.2 Appearance and finish The pipes shall be tested by visual inspection The result is considered as satisfactory if it conforms to 4.3 4.6.3 Geometrical characteristics 4.6.3.1 Internal diameter Measure the minimum internal diameter at no more than 100 mm from each end with an accuracy of 0,5 mm The results are considered to be satisfactory if they conform to 4.5.1.7.1 NOTE At the purchaser’s request the internal diameter can be checked at any place of the pipe, using a method agreed upon between purchaser and manufacturer 4.6.3.2 External diameter For pipes of DN k400, at each end measure the minimum and the maximum diameter approximately where the rubber rings are to be located with an accuracy of 0,1 mm For pipes of DN > 500, at each end determine the outer diameter by measuring the circumference with an accuracy of 0,5 mm, taking into account the thickness of the measuring tape For pipes of 400 < DN k 500 one or other of the above described methods may be used If a measurement of the circumference is used, dimensions of the internal diameter and thickness shall be checked on the same pipe The results are considered to be satisfactory if they conform to 4.5.1.7.3 4.6.3.3 Thickness At each end measure the minimum thickness with an accuracy of 0,1 mm The points of measurement shall be taken: a) for the barrel at approximately 20 mm beyond the end of the machined part of the pipe; b) for the machined end, at approximately 30 mm from the end of the pipe The results are considered to be satisfactory if they conform to 4.5.1.7.2 4.6.3.4 Length of pipe Take the average of two diametrically opposed measurements of the pipe length, with an accuracy of mm The result is considered to be satisfactory if it conforms to 4.5.1.7.4 4.6.3.5 Straightness 4.6.3.5.1 General The straightness shall be assessed by visual inspection If there is a doubt on this assessment, it shall be verified by the following method 4.6.3.5.2 Specimen The test piece shall be a complete pipe 10 © BSI 23 January 2002 EN 512:1994 4.6.3.5.3 Apparatus 4.6.3.5.3.1 Two supports, the distance between the centres of which is equal to 2/3 of the effective length of the pipe to be checked Each support shall be equipped with a roller system which makes it possible to rotate the pipe around itself without longitudinal or lateral movement 4.6.3.5.3.2 A dial gauge with semi-spherical shaped measuring faces or with rounded tips, accurate to 0,1 mm and fixed on a stable base 4.6.3.5.4 Procedure Lay the pipe horizontally on the supports Place the dial gauge at an equal distance, from the supports, in such a way that the sliding spindle of the gauge is in radial contact with the pipe Turn the pipe at least one complete rotation Note the maximum deviation f obtained, rounded to the nearest millimetre (see Figure 2) Figure — Measurement of the straightness 4.6.3.5.5 Expression of results Record the maximum deviation f The result is considered to be satisfactory if it conforms to 4.5.1.7.5 4.6.4 Hydraulic pressure test in the factory 4.6.4.1 Specimen The test piece shall be a complete pipe 4.6.4.2 Apparatus 4.6.4.2.1 The apparatus shall allow closure of the pipe ends by an appropriate device that avoids inducing significant longitudinal stresses of the pipe and capable of applying to the pipe the internal pressure PT as required in Table 4.6.4.2.2 The internal pressure shall be measured by a pressure gauge calibrated to give an accurate reading within 0,05 MPa 4.6.4.3 Procedure Fill the pipe with water and raise gradually the hydraulic pressure until the gauge registers the test pressure in kilopascals derived from Table according to the nominal pressure of the pipe This pressure shall be maintained for 30 s The duration of the test may be reduced to 10 s provided that the internal pressure is increased by 10 % 4.6.4.4 Expression of results Check for bursting, fissures, leakage or sweating The result is considered to be satisfactory if it conforms to 4.5.3 © BSI 23 January 2002 11 EN 512:1994 4.6.5 Hydraulic pressure bursting test 4.6.5.1 Specimen If the test specimen is sealed internally, it shall be a piece of pipe cut from the barrel (excluding the machined end) with a length of not less than 0,5 m and not more than m If the test specimen is sealed externally, it shall be a piece of pipe the end of which may be machined to not less than the nominal wall thickness of the machined end, including tolerances Its minimum length shall be as indicated in Table Table — Test piece lengths Nominal size 50 to 100 125 to 250 300 to 500 600 to 700 800 to 000 100 to 300 400 to 600 700 to 500 Minimum length of bursting test specimen 750 000 500 000 500 000 500 000 4.6.5.2 Apparatus 4.6.5.2.1 A device suitable for putting the test specimen under water pressure avoiding significant axial compression of the pipe which can influence the result of the test, when the pressure approaches its maximum value 4.6.5.2.2 Two enclosure sealing arrangements 4.6.5.2.3 A pressure gauge calibrated to give an accurate reading within 0,05 MPa 4.6.5.3 Procedure Immerse the pipe in water for 48 h Seal the test specimen; fill it with water making sure all the air is evacuated The hydraulic pressure shall be applied at a constant rate and shall be regulated so that failure occurs after at least 15 s and not more than 30 s 4.6.5.4 Expression of results Record the maximum pressure obtained in megapascals The result is considered to be satisfactory if the ratio between the bursting pressure and nominal pressure conforms with Table If required the unit bursting strength may be calculated using the following formula: p d + e R b = 2e where Rb p d e is the unit bursting strength in newtons per square millimetre; is the internal bursting pressure in megapascals; is the actual internal diameter of the test piece in millimetres, taken as an average of two perpendicular measurements made at both ends of the test specimen; is the actual thickness of the wall of the test specimen in the broken section in millimetres, taken as the average of two measurements along the line of the fracture at both ends of the test piece NOTE When agreed between purchaser and manufacturer, the tensile tangential strength of the material may be determined by another acceptable method which does not involve application of internal hydraulic pressure 12 © BSI 23 January 2002 EN 512:1994 4.6.6 Crushing test 4.6.6.1 Specimen The test specimen shall be a piece of pipe cut from the barrel (excluding the machined end), the length of which shall be: — 200 mm for pipes k DN 300; — 300 mm for pipes > DN 300 4.6.6.2 Apparatus 4.6.6.2.1 A press with a loading error of ±3 % maximum, and a reproducibility error of ±2 % maximum 4.6.6.2.2 A lower press block formed by a V-shaped support having an included angle of 170°made of metal or hard wood and a flat upper press block made of the same material The length of the blocks shall be equal to the length of the specimen (see Figure 3) The width of the upper press block shall be in accordance with Table Strips of rubber of suitable width and length shall be interposed between the test blocks and the test specimen The rubber strips shall be 25 mm ± mm thick and of a hardness of IRHD 60 ± Table — Width of the upper press block Nominal size DN up to 450 500 to 600 700 to 800 900 to 000 100 to 200 300 to 400 500 to 600 700 to 800 900 to 000 100 to 200 300 to 400 500 Width b mm 50 60 85 105 130 150 175 195 220 240 265 290 4.6.6.3 Procedure Immerse the specimen in water for 48 h Measure the length of the specimen with an accuracy of mm along two diametrically opposed generating lines Record the average of the two measurements Arrange the test specimen on the V-shaped support and put the upper press block in contact with it, so that the load is applied uniformly (see Figure 3) © BSI 23 January 2002 13 EN 512:1994 Figure — Length of the press blocks The load shall be applied regularly so that the rupture occurs between 15 s and 30 s following the commencement of the application of the load Record the value F of the ultimate load 4.6.6.4 Expression of results Calculate the crushing load per unit length (CL), expressed in kilonewtons: F C L = -L where F is the ultimate crushing load expressed in kilonewtons; L is the effective length of the specimen, taken as an average of the two measurements, expressed in metres The result is considered to be satisfactory if it conforms to 4.5.4.2 If required the unit crushing strength can be calculated using the following formula: nF 3d + 5e R e = Le where Re is the unit crushing strength in newtons per square millimetre; n d e is 0,26 for up to DN 100 and 0,30 for other diameters; is the actual internal diameter of the test specimen, in millimetres, taken as an average of two perpendicular measurements; is the actual thickness of the wall of the test specimen in the broken section, in millimetres, taken as an average of three measurements made along the line of fracture at the top of the ring 4.6.7 Bending test 4.6.7.1 Specimen The test shall be carried out on a pipe or part of a pipe at least 2,2 m long, which may be taken from the pipe having already provided the test specimen for the transverse crushing test 14 © BSI 23 January 2002 EN 512:1994 4.6.7.2 Apparatus 4.6.7.2.1 A press with a loading error of ±3 % maximum, and a reproducibility error of ±2 % maximum 4.6.7.2.2 Two metal V-shaped supports having an included angle of 120° presenting a face 50 mm to 100 mm wide to the pipe and free to move in the plane of bending on two horizontal axes 000 mm apart (see Figure 4) The load shall be applied vertically at an equal distance from the supports in the plane passing through the axis of the specimen It shall be transmitted by a metal pad having the same shape as the supports, but with a width of 100 mm Strips of rubber of 15 mm ± mm thick, with a hardness of IRHD 60 ± shall be interposed between the support and the pipe and between the pad and the pipe 4.6.7.3 Procedure Immerse the specimen in water for 48 h With the test specimen centred in the testing apparatus, the bending load shall be applied at a constant rate, regulated so that the failure occurs between 25 s and 50 s following the commencement of the application of the load Record the value of the load at rupture in newtons 4.6.7.4 Expression of results The result is considered to be satisfactory if it conforms to 4.5.4.3 Figure — Bending test machine 4.7 Marking The pipes shall be marked legibly and indelibly with at least the following: a) nominal diameter, if required; b) nominal pressure; c) manufacturer’s identification; d) date of manufacture; e) AT for products of type AT; f) NT for products of type NT For pipes designed to suit special requirements of a particular project, the marking shall also contain the supplementary necessary information for identification NOTE Attention is drawn to the EC and/or EFTA regulations on labelling © BSI 23 January 2002 15 EN 512:1994 Joints 5.1 Material Sleeves made of fibre-cement shall comply with the requirements of 4.1 and 4.3 Sealing rings shall be elastomeric materials suitable for the liquid to be conveyed and shall comply with the relevant EN standards, unless otherwise agreed between purchaser and manufacturer 5.2 Geometrical characteristics The dimensions and the shape of all parts of the sleeves and elastomeric rings shall be determined by the manufacturer of the pipes The tolerances on all relevant dimensions of the sleeves shall be established by the manufacturer, taking into account the tolerances of the elastomeric seals and on the external diameters of pipe ends The relevant dimensions shall be stated in the manufacturer’s literature 5.3 Special joints Special joints are e.g joints permitting the transition to other materials, other nominal sizes and other pressure levels Some joints can also be designed to be locked joints, thus permitting the transmission of axial forces 5.4 Physical characteristics — watertightness 5.4.1 Internal pressure test The assembled joints, when tested at the factory (PT), shall be capable of withstanding the specified hydraulic test pressure of the pipes on which they are to be used, even when the pipes are set at the maximum angular deflection recommended by the manufacturer and a shear load of 10 times DN in newtons is applied When tested as specified in 5.5 they shall not show any fissure, leakage or sweating 5.4.2 External pressure test The assembled joints, when tested at the factory, shall be capable of withstanding an external hydraulic pressure of 0,08 MPa When tested as specified in 5.5 they shall not show any fissure, leakage or sweating 5.5 Watertightness test 5.5.1 General This test is a type test done at least on the minimum and maximum nominal sizes where the joints have the same sealing system transverse cross-section For each type test carried out, the two most critical combinations of minimum and maximum tolerances given by the manufacturer shall be tested 5.5.2 Specimen The specimen shall contain one joint assembled on two pieces of pipe 5.5.3 Apparatus 5.5.3.1 For internal pressure test 5.5.3.1.1 A device capable of receiving the specimen, sealing the pipe ends and withstanding the forces due to internal pressure whilst allowing for the joint to be misaligned and inspected under pressure 5.5.3.1.2 Sealing devices 5.5.3.1.3 A pressure gauge calibrated to give an accurate reading within 0,05 MPa 5.5.3.2 For external pressure test A pressure tight box or similar device that allows the specimen to be subjected to an external hydraulic pressure test 16 © BSI 23 January 2002