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PRESSURE TUBE OR PITOT TYPE LOG

PRESSURE TUBE OR PITOT TYPE LOG. PRESSURE TUBE OR PITOT TYPE LOG : This log also has a tube which extends out of the bottom plating and which can be retracted back into the hull when not required.

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PRESSURE TUBE OR PITOT TYPE LOG

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  1. PRESSURE TUBE OR PITOT TYPE LOG • PRESSURE TUBE OR PITOT TYPE LOG : • This log also has a tube which extends out of the bottom plating and which can be retracted back into the hull when not required. • The tube has two pipes fitted to it; one facing the forward direction called the DYNAMIC TUBE and the other facing downwards called the STATIC tube.

  2. PRESSURE TUBE OR PITOT TYPE LOG • When the ship is stopped and there is no current or tide, the pressure in both tubes will be equal to the depth of the tube below the water line. • When the ship moves ahead, the pressure in the dynamic pipe will be dynamic pressure + static pressure and hence greater than the pressure in the static pipe ( facing down ).

  3. PRESSURE TUBE OR PITOT TYPE LOG • The DIFFERENCE IN PRESSURE is converted into electrical signals and is proportional to the speed of the ship through the water. • This is displayed as speed and when integrated with time ( speed x no. of hours = distance ) can be fed to a distance counter.

  4. PRESSURE TUBE OR PITOT TYPE LOG • PRINCIPLE • If a tube ( which is closed at one end and open at the other ) is immersed in water open end down, a static pressure will be seen to develop in the tube which is proportional to the depth of the orifice or opening below the water.

  5. PRESSURE TUBE OR PITOT TYPE LOG • If another tube similar to the first one, but with an orifice opening sideways is also immersed to the same depth and moved at a constant speed with its orifice in front, then the pressure in that tube will be the sum of the static pressure ( due to depth ) and the dynamic pressure (due to motion).

  6. PRESSURE TUBE OR PITOT TYPE LOG • This implies that if the difference of these two pressures, that is, • Pressure B ( Dynamic + static ) – Pressure • ( Static ) = Dynamic Pressure • Is obtained, this will be measure of the speed of the ship.

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