Integrated bypass developed by Hydac SA

1. Integrated bypass developed by Hydac SA

2. Paolo 2 Integrated bypass Time schedule • What is an integrated bypass • Why this development • How do the IBP & IBT valves function

3. Hydac’s integrated bypass is a standard bypass mounted inside a special radiator expressly designed for this. Paolo 3 Integrated bypass What is an integrated bypass A bypass is necessary to limit the inlet pressure and to help the rig’s startup with cold liquid.

4. Paolo 4 Integrated bypass Why ? ...only advantages ! • TO REDUCE : • Problems • Space • Cost • With easy maintenance NEW >> and innovative

5. Standard radiator Standard radiator with external bypass 3 bar Radiator with integrated bypass Radiator with IBP3 Radiator with IBP3 Paolo 5 Integrated bypass Even better than the standard external bypass

6. Valve open Pressure drop action values set Close valve Oil flow Paolo 6 Integrated bypass IBP operation Pressure drop depending The IBP valve is closed if the pressure drop in the element is lower than the action set valve. The IBP valve opens if the pressure drop in the element goes over the action set valve. When the bypass is open the liquid flows through the element and the bypass channel.

7. Dp opening valve action Dp with valve compleatly open Paolo 7 Integrated bypass IBP action Valve & channel pressure drop • Available valves : • 2 bar >> IBP2 • 3 bar >> IBP3 Tolerance ± 5 % This holds into account the spring variability action and the channel dimensions.

8. Paolo 8 Integrated bypass IBP estimated Element pressure drop Combine the curves to obtain the element pressure drop. To do this it is only necessary to translate the valve pressure dropcurve parallel to the oil flow axis until it is tangent to the pressure drop matrix.

9. The IBT valve is open if the inlet oil temperature is below that of the action set valve (cold liquid). To reduce the pressure drop consequent to the viscosity increase. Paolo 9 Integrated bypass IBT operation Temperature depending The IBT valve is closed if the inlet oil temperature is above that of the action set valve (hot liquid). To have the maximal power heat exchange.

10. Paolo 10 Integrated bypass IBT action Temperature settings Available with closing temperatures of : 45 °C >> IBT45 50 °C >> IBT50 60 °C >> IBT60 This means that, for an IBT45 the bypass is openuntil 45 °C and after this it will start to close. It takes 5°C to close the valve completely (IBT45 is completely closed at 50 °C and IBT60 at 65°C) The tolerance is 3 °C Now we are checking for the pressure drop on the elements with open bypass (low temperature).

11. the valve action is the same of an IBP valve (it opens if the pressure drop in the element goes over the action set valve). Available valves : > 2 bar (like an IBP2) Paolo 11 Integrated bypass IBT operation Pressure drop depending When the IBT valve is closed because the temperature is above the action set valve,

12. Paolo 12 Integrated bypass IBT estimation Element pressure drop Combine the curves to obtain the same element pressure drop as for the IBP element. Take care of the viscosity of the liquid (declared values at 30 mm2/s)