Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements Section 09: Building Works  20 of 24 9.2.6 Hangers, spacing and supports  9.2.7 Manholes and inspection pits  9.2.8 Sleeves  9.2.9 Protection and cleaning  9.2.10 Floor drains  9.2.11 Installation of pipes  The unions shall be of material corresponding to the pipes in which they are installed, and of the same  weights and rating.  Piping shall be installed without undue strains and stresses and provisions shall be made for expan- sion, contraction and structural settlement. A sufficient number of horizontal and vertical supports  shall be provided at proper intervals.  Manholes shall be provided at suitable locations and additionally where ordered by the Engineer.  The dimensions of the manholes or inspection pits shall be approved by the Engineer. All manholes  shall be provided with cast-iron covers.  The Contractor shall furnish and install all sleeves to be built in for the passage of pipes through struc- tures. The Contractor shall co-ordinate placing of the necessary sleeves, of the appropriate sizes for his re- quirements, at the time the concrete is being poured. It is strictly prohibited to break through rein- forced concrete beams for the passage of pipe unless prior approval is obtained.  Pipe sleeves shall be of adequate size to allow free movement of pipes due to expansion and contrac- tion, whether bare or insulated. Sleeves for pipes shall be PVC.  Pipe sleeves shall be finish flush with floors and roofs and shall project at least 3 cm above floors and  approximately 15 cm above roofs or as otherwise agreed by the Engineer.  After the installation of pipes, the Contractor shall caulk the space between pipe and sleeve with an  approved product to prevent the passage of air and vermin. The caulking shall be made in such a man- ner as to prevent it from coming off with pipe expansion or contraction.  Sleeves in walls of storage tanks for liquids, such as pump sumps etc., shall be sealed with elastic ele- ments, that fill the space between the pipe and the sleeve and can be tightened by a screwing device.  The sleeves shall be of alloyed high grade steel.  The inside of all pipes, valves, etc. shall be clean and free from dirt or other objectionable matters  when erected. All lines shall be blown before placing in service. If necessary, all openings in the pip- ing shall be closed during construction in order to keep the lines free from dirt, etc.  Floor drains shall have cast-iron traps and a minimum water seal of 7.5 cm and shall be provided with  adjustable and removable strainers. The open area of strainer shall be at least two-thirds of the cross- sectional area of the drain line to which it connects. Strainers shall be made of stainless steel or brass.  Pipes passing through walls shall be protected from breakage. A soil or waste pipe passing through a  foundation wall shall be fitted into a PVC-pipe cast in the concrete and furnished with sockets at both  9_Vol3_d4.3_Section 9 building works_en_GIR_rev6.docx 