Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements Section 09: Building Works  19 of 24 9.2.2 General  9.2.3 Pipes and fittings  9.2.4 Joints and connections  9.2.5 Unions  Also included are the following items:  All materials and equipment provided by the Contractor shall be new and of the various qualities as  required by these Employer’s Requirements.  Sanitary piping and fire fighting design drawings shall be presented for the approval of the Engineer.  All workmanship shall be of the highest standard and to the satisfaction of the Engineer. The Contractor shall submit full details, together with drawings, of his proposals for approval of the  Engineer before commencing the work and shall carry out all tests and inspections of the finished  work as may be considered necessary by the Engineer.  The word ”complete” whenever used in these Employer’s Requirements shall mean, in addition to the  major items of plant, all incidental sundry components necessary for the complete operation of the in- stallation, whether or not these components are mentioned in detail. The word ”piping” in these Em- ployer’s Requirements shall mean the inclusion of all pipes, fittings, nipples, valves, and all required  accessories, supports, anchors, guides, etc., for a complete safe and operational network.  The materials to be used for soil, wastewater, rainwater and ventilating pipes, including fittings, within  the building shall be of PVC. Soil and waste piping for the drainage system outside the building shall  be of concrete.  Joints and connections in the sanitary system shall be gastight and watertight for the pressure required  by test. Leaky joints shall be remade by using new materials. Joints in galvanized steel pipes shall be  made by threading. Welding and bending are strictly prohibited on galvanised pipes.  Joints in PVC pipes shall be made with rubber rings and shall be carried out according to manufactur- er’s recommendations.  All distribution pipes shall be provided with unions at adequate intervals to permit easy disassembly  for alternations and repairs.  Unions shall be provided near valves and equipment, which need to be taken out for servicing or re- pairs.  9_Vol3_d4.3_Section 9 building works_en_GIR_rev6.docx   Sanitary fixtures   Hot and cold water plumbing   All work of a civil nature, such as placing of pipe sleeves through floors and roofs for the passage  of pipes at the time the concrete is poured, hangers and supports, excavations and backfill, man- hole with covers, inspection pits etc.   Protection and cleaning   Testing   Miscellaneous. 