02/3927 PT/257/0806

Pipex Specification Data Sheet: PX-MH-SP-003 Pipex Inspection Chambers

Thermoplastic Inspection Chambers Pipex Inspection Chambers will be constructed to provide watertight seal against the ingress of ground water into the manhole and egress of effluent waste from the manhole into the surrounding ground. The inspection chambers will be supplied to site as prefabricated units, fabricated to suit the consultant’s general arrangement drawings as Pipex Internal Manhole Drainage Range. Each inspection chamber will be numbered with an indelible marker to correspond with the inspection chamber number as indicated on the drainage layout drawings. Materials of Construction Manholes – Homopolymer Polypropylene Din 8077 & 8078 HDPE Din 8075 & 8074 Technical Certification Water Research Council (WRc) Certificate No. PT/257/0806 British Board of Agrement (BBA) Certificate No. 02/3927 Branch Connections The incoming drain connections will be configured to suit the drainage system design drawings. The spigot ends will be adapted to suit the connecting drainage system e.g. vitrified clay, PVC, cast iron, ductile iron, HDPE. Internal Benching The inspection chambers will be supplied complete with open channel barren bends or polypropylene bolted inspection covers with gasket seal as indicated on the design drawings. Benching will be fabricated to a gradient of 1:10 to 1:30 and welded form the wall of the chamber to the through drain channel. British Standard Specifications The manholes will be fabricated to BS7158:2001, BS EN13598-1 and comply with Building Regs Section H Sewers for Adoption 6th Edition Clause 5.2.31 Plastic Chambers and Rings. Inspection Chamber Shuttering System Where indicated on the design drawings a factory fabricated shuttering system is welded to each manhole to accept the poured concrete surround. The shuttering will accept a minimum of 150mm thickness concrete surround. Manhole Top Formwork and Access Turret Reinforced top formwork with access turret with clear opening to suit manhole cover and frame, welded to inspection chamber to accept insitu poured concrete cover slab.

Testing Each inspection chamber will be tested at the factory. All branch connections will be fitted with inflatable bag stopper and the manhole filled with water. The manhole will be stood for 30 mins and checked for complete 100% water tightness Inspection Chamber Detail Drawings Detail drawings of each inspection chamber indicating number, cover level, invert level, drain sizes and falls will be submitted for approval in CAD format. Operation and Maintenance When installed to Pipex installation instructions the inspection chambers will operate with minimum maintenance. Due to the nature of the material the units will self cleanse. If rodding is required use polypropylene rods, alternatively the manholes can be pressure jetted to a maximum pressure of 180 bar 2600 psi in accordance with WRc requirements. If alterations are required to the manhole, Pipex will be contacted to discuss the procedure. Testing to BS7158 The following tests have been passed by the BBA and WRc technical approval certification. Clause 7.2 and Appendix A Watertightness of manholes when full of water and when surrounded by water. Clause 7.5 and Appendix E Resistance to thermal cycling. Clause 7.6 and Appendix F Specific tangential initial stiffness (STIS) Clause 7.8 and Appendix I Negative internal pressure test. Clause 7.7 and Appendix G Vertical load test class A15 and D400 when surrounded in concrete. BS EN 13101:2002 Step iron bending test when installed within a Pipex manhole BS EN 13101:2002 Step iron pull-out test when installed within a Pipex manhole. BS EN 1277: 1996 Method 2 condition A Positive pressure test on gasket chamber – internal bolted inspection cover plate.