1 What are the primary elements used for flow measurement?
- The primary elements used for flow measurement are:
- Orifice plate
- Venturi tube
- Pitot tube
- Annubars
- Flow nozzle
2. What are the different types of Orific plate?
- The different types of orifice plate are :
- Concentric
- Segmental
- Eccentric
- Quadrant Edge
3. How do you identify an orifice in the pipeline?
- An orifice tab is welded on the orifice plate which extends outer of the line giving an indication of the plate
4. Why is the orifice tab provided?
- Indication of an orifice plate in a line.
- The orifice diameter is marked on it.
- The material of the orifice plate.
- The tag no of the orifice plate.
- The mark the inlet of the orifice
5. How to identify the high-pressure side or inlet of an orifice plate line?
- The marking is always done high-pressure side of the orifice plate.
6. what are the uses of orifice plate?
- Concentric: the concentric orifice plate is used for ideal liquid as well as gases and steam service. this orifice as a hole in concentric and hence known as concentric orifice
- segmental: the segmental orifice place has the hole is the front segment of a circle. this is used for colloidal and sherry flow measurement
- Eccentric: the eccentric plate has a hole eccentric. The use of this is made in viscous and sherry flow measurements.
- Bernoulli's theorem states the" Total energy of a liquid flowing from one point to another remains constant ." it is applicable for non-compressible liquid
- The differential pressure flow meter is based on Bernoulli's Equation, Where the pressure drop is a squared function of the fluid velocity
8. What is Pressure?
- Pressure can be defined as the force acting per unit area
9. Units of pressure
- Kg /cmâ±½2
- Bar
- Psi
- Pascal
- Mmh20 or mmwc
- Mmhg
10. What are the pressure sensing elements?
- Bourdon tube
- Diaphragm
- Bellow
11. Pressure unit Conversion
- 1 kg/cm2=14.223 PSI
- 1 bar = 14..504 PSI
- 1 kg/cm2=0.9807 bar
- 1 bar = 100000 pascal
12. What does pressure transducer do?
- A pressure transducer converts pressure into mechanical or electrical signal
13. What are the three instruments to measure pressure
- Pressure transmitter
- Pressure gauge
- Manometer
14. What is absolute pressure
15. What is gauge pressure
16. What is vacuum pressure
17. What Is compound?
18. What is the principle of a pressure gauge?
- Hooks law state that “measuring pressure in elastic medium
19. What is a deadweight tester?
- deadweight tester is used for pressure calibration
20. What is the principle of dead weight tester?
- Deadweight tester works on the principle of pascal law
21. What is the pressure transmitter(PT)?
- Pressure transmitter is a device which is used to measure process pressure with an output 4 to 20 mA
22. What is the sensor of the pressure transmitter?
- Diaphragm
23. What is Siphon?
- Siphon is a device used to protect a pressure sensor from high-temperature media such as steam
- Siphon can also be used to reduce the damaging effect of rapid pressure changes
- These devices allow the system to use a pressure sensor with a much lower temperature range in high-temperature application
- The pressure medium forms a condensate and is collected inside the siphon prevents direct contact with external media. The condensate prevents hot medium coming in direct contact with the pressure instrument
- When the siphon is first installed it should be filled with water or other suitable separating liquid.
24. What is a pressure switch?
- Pressure switch is an electromechanical device which is used to change over contacts from normally open NO to normally close NC and normally NC to normally open NO when pressure reaches to set point
25. How to calibrate a pressure switch?
- Connect pressure switch and standard gauge on pressure source
- Connect multimeter at pressure switch contacts
- Set cut in(set) and cut out pressure settings
- Now apply pressure and check contacts change over from NO to NC to NC to NO according to pressure setting If not then adjust it
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