 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 

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. 

## 4.19.2.4 Testing of Pipes Generally 

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. 

## 4.19.2.5 Testing of Pipelines 

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. 

## 4.19.2.6 Testing of Tanks 

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: 

 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. 

