Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 04: General Requirements for the Execution and Completion of the Works  31 of 40  Each sludge dewatering machine shall be tested for its purpose, stability, capacity, power  consumption and for full reliability in all aspects.  Each chemical, polymer and lime dosing station shall be tested for its purpose, stability,  capacity, power consumption and for full reliability in all aspects.  Each motor for the emergency and drying unit shall be tested for fuel input, power and  thermal output and effectiveness and for full reliability in all aspects. 4.19.2.3 Hydraulic Tests 4.19.2.4 Testing of Pipes Generally  Pumps, pipes, valves and pressure vessels shall be hydraulically tested to the pressure as specified  or to at least 2.0 times the maximum working pressure or 1.5 times the normal pressure, whichever  is the greater.  The testing of pipes shall in all cases be carried out in the presence and to the satisfaction of the  Engineer. The Contractor shall give the Engineer advance written notice of his intention to carry  out testing. The form and period of notice are to be agreed between the Engineer and Contractor.  Test Certificates – shall be prepared by the Contractor in a form to be agreed upon, and shall be  signed by the Engineer on the satisfactory completion of each test. One copy of each signed  certificate shall be kept by the Engineer and one by the Contractor. The complete pipeline,  including blank flanges, caps, plugs, pressure gauges, pipe connection cocks, struts and thrust  blocks, etc., shall be provided with anything necessary for effectively testing the pipelines at the  required pressure. The Contractor shall keep the said plant in good order during the continuity of  the Contract, all at his own expense. Any pipe or length of pipe found to be defective shall be  immediately removed and replaced without additional cost, and leaking joints shall be remade. The  test shall be repeated as often as necessary until the whole length under test is accepted by the  Engineer.  The testing of pipelines will be carried out according to relevant norms and standards.  Hydraulic tests will also be applied for all pipes of the force mains.  The testing of tanks on water tightness will be carried out similar to EN 1992-3 (or internationally  acceptable standards). The following is an overview for testing with EN 1992-3. Smaller flow  confluence or distribution chambers and manholes of gravity pipelines shall be tested accordingly:  4.19.2.5 Testing of Pipelines  4.19.2.6 Testing of Tanks   Excavation for tanks shall not be filled,  Outside and inside faces of tanks wall shall neither be coated nor plastered,  The plain concrete (for making of internal benching etc.) shall not be placed before the  water tightness tests have been successfully passed.   The test may not be commenced before the concrete has hardened for 28 days.   Filling of tanks with water shall take place at a uniform rate of not greater than 2 m in  24 hours.  4_Vol3_d4.3_Section 4 General Requirements_en_GIR_rev6 