Answer Posted / arun george
hi all,
Thought that the answers require and little more add on. It is correct that vent is provided for liquid service orifice assemblies and drain for gas/vapour service orifice assemblies. The reason, if no drain hole is given in a gas/vapour service assembly the liquid droplets gets accumulated at the bottom.This keeps on happening till the liquid level reaches the bore of the orifice.Now the liquid starts overflowing through the bore causing sudden pressure drops causing unstable transmitter readings and may also damage it. In the case of vent holes in liquid service orifices the vice-versa happens.
| Is This Answer Correct ? | 1 Yes | 0 No |
Post New Answer View All Answers
how do i tune dearator pr control valve using PID. we set the set point is 0.6kg/cm2 now i want 0.5 to 0.7kg/cm2 limits so what should i give p,i,d values. then pls explain how do set pid values for control valve tuning?
in valve is constructed as per SME B 16.34, then which standard is used for fire testing of valve?.
Why 4-20 amps is being used in instruments? Why cant we use any other range instead of 4-20 amps? Why only 4 amps is taken as lower limit and why 20 amps is taken as the higher limit?
what is performance test.need defination
i hav applied for the post of engg. in iocl so please require the past test papers fro instrumentation engg please please help me and send me the papers or tell me the pattern and type of ques asked in examination......
can we create an interrupt in plc through scada?
How to calibrate an pressure gauge with yantrika test bench?
A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.
What is modbus?
WHAT IS MEANT BY PROJECT MANAGEMENT STRATEGIES IN INSTRUMENTATION?
TEMPERATURE VARIATION FOR FREQUENTLY.
In a gas over oil actuator, after the opening/closing of valve, how the gas is vented out? How does the hydraulic/gas circuit function?
we have level transmitter for h2s04 storage tank capacity 10k ,always there are failure of transmitter due to failure of magnetic floats ,please come up with solutions at the earliest.
How oil line flow measured?eplain about instruments used and working principle?
how to calibrate 0- 150 psi presure gauge by dead weght tester
