NAYLOR METRODRAIN TWINWALL HIGHWAY DRAINAGE SYSTEM NAYLOR METRODRAIN TWINWALL HIGHWAY DRAINAGE SYSTEM 150 MM TO 750 MM PIPES AND COUPLERS

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1 H A P A S Naylor Drainage Ltd Cloug Green Cawtorne Barnsley Sout Yorksire S75 4AD Tel: Fax: sales@naylor.co.uk website: NAYLOR METRODRAIN TWINWALL HIGHWAY DRAINAGE SYSTEM APPROVAL INSPECTION TESTING CERTIFICATION TECHNICAL APPROVALS FOR CONSTRUCTION HAPAS Certificate 09/H145 Product Seet 1 NAYLOR METRODRAIN TWINWALL HIGHWAY DRAINAGE SYSTEM 150 MM TO Tis Certificate relates to Naylor Metrodrain Twinwall Higway Drainage System 150 mm to 750 mm Pipes and Couplers, for use as filter and carrier pipes in igway drainage. CERTIFICATION INCLUDES: factors relating to compliance wit HAPAS requirements factors relating to compliance wit Regulations were applicable independently verified tecnical specification assessment criteria and tecnical investigations design considerations installation guidance regular surveillance of production formal tree-yearly review. 750 MM PIPES AND COUPLERS Tis HAPAS Certificate Product Seet (1) is issued by te Britis Board of Agrément (BBA), supported by Higways England (HE) (acting on bealf of te Overseeing Organisations of te Department for Transport; Transport Scotland; te Wels Assembly Government and te Department for Infrastructure, Nortern Ireland), te Association of Directors of Environment, Economy, Planning and Transport (ADEPT), te Local Government Tecnical Advisers Group and industry bodies. HAPAS Certificates are normally eac subject to a review every tree years. (1) Hereinafter referred to as Certificate. KEY FACTORS ASSESSED Strengt te products ave adequate strengt to resist loads associated wit installation and service (see section 6). Performance of joints te products will remain watertigt under normal service conditions (see section 7). Durability te products will ave a service life in excess of 50 years (see section 11). Te BBA as awarded tis Certificate to te company named above for te products described erein. Tese products ave been assessed by te BBA as being fit for teir intended use provided tey are installed, used and maintained as set out in tis Certificate. On bealf of te Britis Board of Agrément Date of Fift issue: 2 July 2018 Paul Valentine Claire Curtis-Tomas Originally certificated on 2 April 2009 Tecnical Excellence Director Cief Executive Te BBA is a UKAS accredited certification body Number 113. Te scedule of te current scope of accreditation for product certification is available in pdf format via te UKAS link on te BBA website at Readers are advised to ceck te validity and latest issue number of tis Agrément Certificate by eiter referring to te BBA website or contacting te BBA direct. Any potograps are for illustrative purposes only, do not constitute advice and sould not be relied upon. Britis Board of Agrément Bucknalls Lane tel: Watford clientservices@bbacerts.co.uk Herts WD25 9BA Page 1 of 9

2 Requirements In te opinion of te BBA, Naylor Metrodrain Twinwall Higway Drainage System 150 mm to 750 mm Pipes and Couplers, wen used in accordance wit te provisions of tis Certificate, will meet or contribute to meeting te requirements of te Manual of Contract Documents for Higways Works (MCHW) (1), Volume 1 Specification for Higways Works (SHW). (1) Te MCHW is operated by te Overseeing Organisations: Higways England (HE), Transport Scotland, te Wels Assembly Government and te Department for Infrastructure (Nortern Ireland). Regulations Construction (Design and Management) Regulations 2015 Construction (Design and Management) Regulations (Nortern Ireland) 2016 Information in tis Certificate may assist te client, designer (including Principal Designer) and contractor (including Principal Contractor) to address teir obligations under tese Regulations. See sections: Tecnical Specification 3 Delivery and site andling (3.1) and 13 General of tis Certificate. 1 Description 1.1 Naylor Metrodrain Twinwall Higway Drainage System 150 mm to 750 mm Pipes and Couplers comprise a range of polyetylene pipes wit a black outer layer and a green inner layer, and black polypropylene or polyetylene couplers. Te pipes are available in bot perforated and unperforated forms. 1.2 Te raw material specification of te pipes is given in Table 1. Table 1 Material properties and specifications (1) Property Test metod/reference Specification Tensile properties BS EN ISO > 20 MPa Oxygen induction time BS EN min Melt flow rate BS EN ISO g (10 min) kg at 190 C Density BS EN ISO , BS EN ISO > 850 kg m 3 (1) Tis table is in te format of Appendix 5/7 of te MCHW, Volume 2. It is used to satisfy Clause of te MCHW, Volume Naylor Metrodrain Twinwall pipes are supplied wit plain ends in sizes 150, 225, 300, 375, 450, 600 and 750 mm. Pipes of 375, 450, 600 and 750 mm are also available wit an integrally formed socket at one end. Te outer wall is corrugated and te inner wall is smoot-finised. Details and dimensions are given in Table 2 and Figure 1. Table 2 Twinwall pipe dimensions internal pipe diameter (d 1 ) Minimum internal pipe diameter (d 1 ) external pipe diameter (d 2 ) t 1 (minimum) t 3 (minimum) lengt (m) mass (kg m 1 ) Page 2 of 9

3 Figure 1 Twinwall pipe dimensions t 3 t 1 d 2 d Pipes can be supplied eiter perforated or unperforated. Perforated pipes are available wit te slots in te dwell between corrugations equally spaced around te circumference (see Table 3 and Figure 2). Alternatively, te slots are located on one alf of te pipe only and tus te permeable area is approximately alved. For te 750 mm pipes, two perforation patterns are offered, slots or oles. Table 3 Twinwall perforated pipe dimensions internal pipe diameter Fully perforated Number of slots per dwell Number of rows of slots Number of dwells per metre Slot lengt (nominal) Slot widt (nominal) Permeable area (nominal) (mm 2 m 1 ) /0 (1) (slots) (oles) Half perforated 150 6/0 (1) (slots) (oles) (1) Slots in alternate dwells only. Page 3 of 9

4 Figure 2 Twinwall perforated pipe dimensions Couplers 1.5 Couplers are available for eac size of pipe (see Table 4 and Figure 3). Table 4 Twinwall coupler dimensions internal pipe diameter Minimum internal diameter d 3 external diameter d 4 lengt L seal eigt Figure 3 Twinwall coupler dimensions (1) L d 4 d 3 (1) Te illlustration is for information only. d3 is taken at te seal location. Te actual coupler design may differ from tat sown. Seals 1.6 Eac coupler requires two rubber seals manufactured to BS EN : 1996, available from te Certificate older (see Figure 4). Te seals must be fitted in accordance wit te installation instructions to ensure a watertigt joint. Page 4 of 9

5 Figure 4 Twinwall seal dimensions 150 mm Seal 225 mm Seal 300 mm Seal 375 mm Seal 450 mm Seal 600 mm Seal 750 mm Seal 2 Manufacture 2.1 Te pipes are manufactured by a twin extrusion process in wic two pipes are extruded simultaneously, one inside te oter, and eat-welded togeter in one continuous process. 2.2 Te couplers are injection-moulded in polypropylene, or rotationally moulded in polyetylene. 2.3 As part of te assessment and ongoing surveillance of product quality, te BBA as; agreed wit te manufacturer te quality control procedures and product testing to be undertaken assessed and agreed te quality control operated over batces of incoming materials monitored te production process and verified tat it is in accordance wit te documented process evaluated te process for management of nonconformities cecked tat equipment as been properly tested and calibrated undertaken to carry out te above measures on a regular basis troug a surveillance process, to verify tat te specifications and quality control operated by te manufacturer are being maintained. 2.4 Te management system of Naylor Drainage Ltd as been assessed and registered as meeting te requirements of BS EN ISO 9001 : 2015 by BSI (Certificate FM 01420). 3 Delivery and site andling 3.1 Pipes wit nominal internal diameters up to 450 mm are generally delivered packed in stillages and sould be retained in teir packaging until installation. 600 and 750 mm pipes are delivered loose and sould be kept on firm, flat ground prior to installation. 3.2 Handling, storage and transportation of te pipes and couplers must be in accordance wit te Certificate older s instructions, wit care taken to avoid damage by dropping or dragging. Tey sould be adequately supported at all times, and contact wit sarp projections, protuberances and abrasive surfaces sould be avoided. 3.3 Wen long-term storage is envisaged, te pipes and couplers must be protected from direct sunligt. If protection cannot be provided, consideration must be given to te effects of daily exposure to direct sunligt: up to 3 monts negligible UV degradation but possible extreme surface temperatures of up to 80 C may cause some localised distortion 3 to 12 monts may ave significant effect on te impact resistance and pysical properties of te products over 12 monts damage will occur unless protection is provided. 3.4 Te Certificate older can manufacture te pipes wit enanced UV stability if required. Assessment and Tecnical Investigations Te following is a summary of te assessment and tecnical investigations carried out on Naylor Metrodrain Twinwall Higway Drainage System 150 mm to 750 mm Pipes and Couplers. Design Considerations 4 Use Naylor Metrodrain Twinwall Higway Drainage System 150 mm to 750 mm Pipes (perforated and unperforated) and Couplers comply wit te requirements of te MCHW, Volume 1, Clause for pipes, Clause for couplers, couplers and Clause for te system. Wen installed in accordance wit te recommendations given in tis Certificate, tey are satisfactory for use in igways for te collection and disposal of surface and sub-surface water. 5 Practicability of installation Te products must be installed by competent contractors experienced wit tese types of products using traditional drain-laying metods in accordance wit HE requirements and te MCHW, Volume 1, Clauses 503, 505, and Te lengts in wic te pipes are available and teir ligtness in weigt are a significant advantage during andling and installation, and jointing of te pipes can be readily acieved. Page 5 of 9

6 6 Strengt 6.1 Te pipes ave a ring stiffness equal to or in excess of 6 kn m 2, a creep ratio of less tan 4 and adequate resistance to static loads. 6.2 Te pipes ave adequate resistance to impact loads to wic tey may be subjected during installation and in service. 6.3 Te pipes can be used as an alternative to te plastic pipes for surface water drains listed in te MCHW, Volume 1, Table 5/1, and for safe bedding dept purposes may be assumed to ave a standard dimension ratio (SDR) not greater tan Performance of joints 7.1 Joints on filter pipes made from pipe and couplers witout te rubber seals are not partially watertigt as defined in te MCHW, Volume 1, Clause Wen correctly made, joints constructed from pipe and couplers or plain and socketed pipe ends wit rubber seals remain watertigt wen subjected to deflection and distortion, and comply wit te MCHW, Volume 1, Clauses and (see section 15). 8 Water infiltration Te slot area for te pipes exceeds te minimum requirement given in te MCHW, Volume 1, Clause of 1000 mm 2 per metre lengt (see Table 3). 9 Flow caracteristics 9.1 Te pipes will ave normal flow caracteristics associated wit PVC-U pipes. 9.2 Full-bore velocities are available from Tables of te Hydraulic Design of Pipes, Sewers and Cannels, Volume 2, 8t Edition by H R Wallingford and D I H Barr. Te values are based on te Colebrook-Wite equation. An appropriate value of rougness coefficient sould be selected wen designing te drainage system. For new pipes, a value of mm is applicable, but for designs, a value of 0.6 mm is generally used. 10 Maintenance 10.1 Access to te products for cleaning sould be provided by conventional metods Te slots are designed to restrict te ingress of silt into te drains Te products can be rodded readily using flexible drain rods. In common wit oter standard plastic drainage systems, tooted root cutters and rods wit metal ferrules, as used wit some mecanical clearing systems, could damage te pipes and couplers and sould not be used Results of tests indicate tat te pipes ave adequate resistance to water cleansing using pressure-jetting equipment. It is recommended tat low-pressure, ig-volume systems are used in accordance wit te MCHW, Volume 1, Clause Durability In te opinion of te BBA, wen te products are used in te context of tis Certificate, te material from wic te pipes and couplers are manufactured will not significantly deteriorate and te anticipated service life of te products will be in excess of 50 years. 12 Reuse and recyclability Te products are manufactured from polyetylene or polypropylene, wic are recyclable. Installation 13 General Naylor Metrodrain Twinwall Higway Drainage System 150 mm to 750 mm Pipes and Couplers must be installed in accordance wit HE requirements and te MCHW, Volume 1, Clauses 503, 505, and Procedure 14.1 For typical laying, trenc and backfilling specification details, reference sould be made to Figure 5 and te MCHW, Volume 3, Drawing Nos F1 (Type T and S) and F2 (Type G, H and I). Page 6 of 9

7 Figure 5 Installation details 14.2 Pipes can be cut using conventional and tools, and sould be cut square between te corrugations For a watertigt joint, te pipe ends and coupler or socket pipe end sould be cleaned and a rubber seal fitted. For sizes between 150 and 600 mm te seal is fitted externally between te first and second corrugation in te pipe. For 750 mm pipe te seal is fitted between te first and te second corrugation if using a socketted pipe, and between te second and te tird corrugation if using a coupler. Te seal and inside of te coupler or socket pipe end sould be lubricated wit a Naylor-approved lubricant and te pipe pused fully ome to te register, eiter by and or using a lever if necessary Te pipes and couplers must be protected against damage from site construction traffic Care sould be taken during backfill to maintain te line and level of te pipeline. If necessary, te pipe sould be restrained to prevent uplift. Tecnical Investigations 15 Tests 15.1 Tests were carried out on te pipe and te results assessed to determine compliance wit te MCHW, Volume 1, Clause 518.5, including: determination of ring stiffness to BS EN ISO 9969 : 2016 creep ratio to BS EN ISO 9967 : 2016 resistance to longitudinal bending to te MCHW, Volume 1, Clause impact strengt at 0 and 23 C to BS EN 1411 : 1996 wit a d25 striker of 1.0 kg mass rodding resistance to te MCHW, Volume 1, Clause water jetting WRc metod Tests were carried out on jointed pipe to establis compliance wit te MCHW, Volume 1, Clauses and 518.7, of: leaktigtness of joints to BS EN 1277 : 2003 wen subjected to diameter distortion and angular deflection resistance to rodding Tests were carried out to establis te dimensional accuracy of te pipe, coupler and ring seal. 16 Investigations 16.1 An assessment was made of data in relation to te effect of te production tolerances on te performance of te products An evaluation of existing data was made to assess material properties, cemical resistance and durability. Page 7 of 9

8 16.3 Calculations were carried out to determine te slot area of perforated pipes Visits were carried out to sites in progress to assess te practicability of installation Te manufacturing process was evaluated, including te metods adopted for quality control, and details were obtained of te quality and composition of te materials used. Bibliograpy BS EN : 1996 Elastomeric seals Material requirements for pipe joint seals used in water and drainage applications Vulcanized rubber BS EN 728 : 1997 Plastic piping and ductig system Polyolefin pipes and fittings Determination of oxidation induction time BS EN 1277 : 2003 Plastics piping systems Termoplastics piping systems for buried non-pressure applications Test metods for leaktigtness of elastomeric sealing ring type joints BS EN 1411 : 1996 Plastics piping and ducting systems Termoplastics pipes Determination of resistance to external blows by te staircase metod BS EN ISO : 1996 Plastics Determination of tensile properties Test conditions for films and seets BS EN ISO : 2011 Plastics Determination of te melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of termoplastics Standard metod BS EN ISO : 2012 Plastics Metods for determining te density of non-cellular plastics Immersion metod, liquid pyknometer metod and titration metod BS EN ISO 9001 : 2015 Quality management systems Requirements BS EN ISO 9967 : 2016 Termoplastic pipes Determination of creep ratio BS EN ISO 9969 : 2016 Termoplastic pipes Determination of ring stiffness BS EN ISO : 2014 Plastics Polyetylene (PE) moulding and extrusion materials Designation system and basis for specifications Manual of Contract Documents for Higway Works, Volume 1 Specification for Higway Works Manual of Contract Documents for Higway Works, Volume 2 Notes for Guidance on te Specification for Higway Works Manual of Contract Documents for Higway Works, Volume 3 Higway Construction Details Page 8 of 9

9 Conditions of Certification 17 Conditions 17.1 Tis Certificate: relates only to te product/system tat is named and described on te front page is issued only to te company, firm, organisation or person named on te front page no oter company, firm, organisation or person may old or claim tat tis Certificate as been issued to tem is valid only witin te UK as to be read, considered and used as a wole document it may be misleading and will be incomplete to be selective is copyrigt of te BBA is subject to Englis Law Publications, documents, specifications, legislation, regulations, standards and te like referenced in tis Certificate are tose tat were current and/or deemed relevant by te BBA at te date of issue or reissue of tis Certificate Tis Certificate will remain valid for an unlimited period provided tat te product/system and its manufacture and/or fabrication, including all related and relevant parts and processes tereof: are maintained at or above te levels wic ave been assessed and found to be satisfactory by te BBA continue to be cecked as and wen deemed appropriate by te BBA under arrangements tat it will determine are reviewed by te BBA as and wen it considers appropriate Te BBA as used due skill, care and diligence in preparing tis Certificate, but no warranty is provided In issuing tis Certificate, te BBA is not responsible and is excluded from any liability to any company, firm, organisation or person, for any matters arising directly or indirectly from: te presence or absence of any patent, intellectual property or similar rigts subsisting in te product/system or any oter product/system te rigt of te Certificate older to manufacture, supply, install, maintain or market te product/system actual installations of te product/system, including teir nature, design, metods, performance, workmansip and maintenance any works and constructions in wic te product/system is installed, including teir nature, design, metods, performance, workmansip and maintenance any loss or damage, including personal injury, owsoever caused by te product/system, including its manufacture, supply, installation, use, maintenance and removal any claims by te manufacturer relating to CE marking Any information relating to te manufacture, supply, installation, use, maintenance and removal of tis product/ system wic is contained or referred to in tis Certificate is te minimum required to be met wen te product/system is manufactured, supplied, installed, used, maintained and removed. It does not purport in any way to restate te requirements of te Healt and Safety at Work etc. Act 1974, or of any oter statutory, common law or oter duty wic may exist at te date of issue or reissue of tis Certificate; nor is conformity wit suc information to be taken as satisfying te requirements of te 1974 Act or of any statutory, common law or oter duty of care. Britis Board of Agrément Bucknalls Lane tel: Watford clientservices@bbacerts.co.uk Herts WD25 9BA Page 9 of 9