30 of 49 Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 05: Earth Works, Pipe Works and Ground Improvement  j) Air tests shall not be permitted.  k) Hydrostatic testing of steel pressure pipelines shall be carried out as specified in the  relevant National guidelines. The test pressure for steel pipelines shall be a minimum of  1.5 times the working pressure.  l) Hydrostatic testing of ductile iron pressure pipelines shall be as specified in the relevant  National guidelines. The test pressure for ductile iron pipes shall be a minimum of working  pressure plus 5 Bar.  m) For all other pressure pipelines the test pressure shall not be less than the maximum  pressure under surge conditions or the maximum pressure caused by pumping against a  closed valve.  n) The test pressure at the lowest point in the pipeline shall not exceed the maximum pressure  recommended for the pipe being tested.  p) Prior to testing any pressure pipeline the Contractor shall submit for the Engineer's  consent details of all temporary thrust blocks. These details shall be submitted with  sufficient calculations to demonstrate that the thrust blocks will resist the specified test  pressure. The Contractor shall submit these details at least 10 working days before the  commencement of the particular test.  o) Where a new pipeline is to connect to an existing pipeline, the new pipeline shall be tested up  to the point of connection. After testing the connection shall be made up and left exposed for  visual  inspection  by  the  Engineer.  The  pipeline  shall  be  accepted  if  no  leakage can be detected under normal operating pressure after a period of 24 hours.  5.3.10.8 Testing of PVC and Polyethylene Pressure Pipes  Hydrostatic testing of pressure pipelines shall be performed in accordance with the requirements of  EN 805 or as specified below.  The clauses specified above 5.3.10.8-a), b), .c), .d), e), .g), .h), .i), .j), .n), .o), and p).shall be applied  for testing of PVC and Polyethylene pressure pipes.  Testing is to be done in accordance with the manufacturer's recommendations.  The hydrostatic test pressure for polyethylene pipes shall be 1.5 times the rated pressure for systems  rated up to 10 bar and 1.5 times the working pressure for 12 or 16 bar systems.  Hydrostatic testing of PVC-U pipelines shall be carried out as specified in the relevant National guide- lines or in accordance with manufacturer's instructions. The test pressure for PVC-U pipes shall be the  greater of the rated pressure and 1.5 times the working pressure.  5.3.10.9 Deformation testing of plastic pipes  All plastic pipes for gravity use shall be tested for deformation after backfilling and compaction.  For non-man-entry pipes the deformation test can be performed by a robot or by using a calibre which  is pulled through the pipe. The calibre size shall be agreed with the Engineer.  The deformation shall be less than recommended by the pipe manufacturer for the installation of the  specific location and considering the future load of soil cover, ground water at ground level and traffic,  when the pipes are located in a road.  For man-entry pipes the deformation shall be determined by internal measurements at least for every 2  m of the pipeline length or as agreed with the Engineer.  5_Vol3_d4.3_Section 5 Earth and pipe works_en_GIR_rev6.docx 