Answer:
Construction
Pitot tube
MOC
· Metal Tubing
· Plastic Tubing
· Rubber / Silicone / Elastomer Tubing
· Fiberglass / Composite Tubing
· Glass Tubing
The basic instrument consists of two coaxial tubes:
1. Static tube(exterior) (b):The opening of the static tube is parallel to the direction of flow. It measures the static pressure, since there is no velocity component perpendicular to its opening. it has small orifices(holes).
2. Impact tube(interior) (a): The opening of the impact tube is perpendicular to the flow direction. The point at the entrance of the impact tube is called as the stagnation point .At this point the kinetic energy of the fluid is converted to the potential energy. Thus, the impact tube measures the total pressure (also referred to as stagnation pressure) i.e. both static pressure and dynamic pressure (also referred to as impact pressure).
The two tubes are connected to the legs of a manometer or equivalent device for measuring pressure.
One end of the tube faces the flow while the other end is open to atmosphere.