Answer / nimesh

PID means proportional integral deerivative.
PID used to eliminate offset & for least maximum deviation.
OR
PID means piping & instrumentation.
PID used to eloborate plant layout with all instrumentation.

Answer / murthy

PID- proportional integral and derivative
there different types of controlling techniques,
combinations of these parameters in designing controllers.
it depends on what type of errror occurs in ur
system,deviation from ur set point,time u want ur
controller to take action.
if u want quick acting one then go for only proportional
controller,the disadvantage is you get higher deviation.
if u want to minimze error (measured-set value) go for
integrated controller,disadvantage-your final forms cyclic
fluctuations.
derivative is taken into acount when u want zero cycling
always it is not suggeted to go for PID controller,as it is
costly,ur system may not need it at all.for eg if u want to
control level of a tank with 2 feeds and one withdrawl u
dont need integral action so u can go for PD controller
only

Answer / r sridhar

PID is Proportional Integral and derivative Control.this
closed loop control system is the basis on which a DCS
works.In a Distributed Control system environment you will
find almost all the controllers are of PID type of
Controllers.

Answer / baskar

pid are the controller where it can used in closed loop
system or non-interacting level system.

HOW WOULD YOU CALIBRATE A ROTAMETER

2 Answers   IOCL,

---

To how much height the liquid willbe thrown out to atmosphere from a pump with a discharge pressure of 5bar

4 Answers   TCL,

---

CHEMICAL MATERIAL BALANCE - EXAMPLE 2.4 : A mixture consists of benzene (B), toluene (T) and xylene (X). At a temperature of 353 K, the data of vapor pressures : B : 754.12, T : 289.71, X : 91.19. Unit is mm Hg. The pressure P is 0.5 atm. The value of k for each substance is k = (vapor pressure) / P. (a) Calculate k for B, T and X. Let L / V = 0.65. (b) By using the equation V = F / [ (L / V) + 1 ], find the value of V when F = 100, then what is the value of L?

1 Answers  

---

Which type of pneumatic control valve is used mostly Either Air to Open r Air to close the value And guys I need reason for your reason

0 Answers  

---

What do you know about us?

4 Answers   Allfon, Bhushan Power Steel, CPCL, Crystol, Trident,

---

what is the relation between velocity & pressure. tel me if pressure in water line is increased what wil b effect on velocity ?

5 Answers  

---

Question 79 - (a) The American Petroleum Institute gravity, or API gravity, is a measure of how heavy or light a petroleum liquid is compared to water. Let SG = specific gravity of petroleum liquid, and V = barrels of crude oil per metric ton. Given the formula for API gravity = 141.5 / SG - 131.5 and V = (API gravity + 131.5) / (141.5 x 0.159), find the relationship of SG as a function of V. (b) An oil barrel is about 159 litres. If a cylinder with diameter d = 50 cm and height h = 50 cm is used to contain the oil, find the volume V of the cylinder in the unit of oil barrel by using the formula V = 3.142 x d x h x d / 4. (c) First reference : 1 cubic metre = 6.2898 oil barrels. Second reference : 1 cubic metre = 6.37 oil barrels. What are the 2 factors that cause the difference in such reference data?

1 Answers  

---

Why whenever a reciprocating compressor is switched ON or OFF it is put into unloading mode?

0 Answers  

---

Explain the different ways in which solids can be blended?

0 Answers  

---

did sulphur been a byproduct after the combustion of LPG and Natural Gas

3 Answers  

---

Explain what are the assumptions made on conservation equation?

0 Answers  

---

What parameters should be considered while selecting type of filter?

4 Answers   Nocil,

---