29 of 49 Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 05: Earth Works, Pipe Works and Ground Improvement  highest point, and not greater than 6m head at the lowest point of the section. Steeply graded pipelines  shall be tested in stages in cases where the maximum head, as stated above, would be exceeded if the  whole section were tested in one length.  The pipeline shall be filled with water and a minimum period of 2 hours shall be allowed for absorp- tion, after which water shall be added from a measuring vessel at intervals of 5 minutes and the quality  required to maintain the original water level noted. Unless otherwise specified, the length of pipeline  shall be accepted if the quantity of water added over a 30 minute period is less than 0.5 liter per linear  meter per meter of nominal bore.  Non-pressure pipelines to be air tested shall have air pumped in by suitable means until a pressure of  100 mm head of water is indicated in a U-tube connected to the system. The pipeline shall be accepted  if the air pressure remains above 75 mm head of water after a period of 5 minutes without further  pumping, following a period for stabilization. Failure to pass the test shall not preclude acceptance of  the pipeline if a successful water test, ordered by the Engineer, can subsequently be carried out.  5.3.10.6 Air Test for Non-Pressure Pipelines  5.3.10.7 Testing of Pressure Pipelines (excluding 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:  a) The entire pipeline shall be pressure tested.  b) Gauges used for testing pressure pipelines shall either be of the conventional circular type, not  less than 200mm diameter, calibrated in meters head water, or shall have a digital indicator  capable of reading increments of 0.1m head. Before any gauge is used, the Contractor shall ar- range for it to be checked independently and a dated certificate of its accuracy shall be provid- ed.  c) Before testing, valves shall be checked and sealed, the sections of pipeline filled with water  and the air released. After having been filled, pipelines shall be left under operating pressure  for 24 hours, so as to achieve conditions as stable as possible before commencing testing.  d) The pressure in the pipeline shall then be raised steadily until the specified test pressure is  reached in the lowest part of the section, and the pressure shall be maintained at this level by  pumping if necessary, for a period of one hour. The pump shall then be disconnected, and no  further water shall be permitted to enter the pipeline for a further period of one hour. At the  end of this period the original pressure shall be restored by pumping and the loss measured by  drawing off water from the pipeline until the pressure as at the end of the test is again reached.  e) The permissible loss shall not exceed 2 liters per meter nominal bore per kilometer length per  meter head (calculated as the average head applied to the section) per 24 hours.  f) Test pressures shall be 1.5 x working pressure, with a minimum of 6 bars, except where  instructed by the Engineer.  g) All testing apparatus and materials including cap-ends, blank flanges, etc. shall be provided by  the Contractor. The Contractor shall provide all labor, plant and materials to carry out the  pressure testing.  h) The Contractor shall be responsible for the supply of water for pressure testing. Water for dis- posal must be channeled to the nearest available watercourse/storm water drainage  system as approved by the Engineer.  i) For the duration of the test air valves shall be isolated, valve gland packings shall be  tightened down where applicable, and re-adjusted on completion of the successful test.  5_Vol3_d4.3_Section 5 Earth and pipe works_en_GIR_rev6.docx 