Answer / papu

• Keep to standard engineering rules in planning the use
of and operating the device!
• Installation and intervention for maintenance work are
only allowed by qualified personnel using suitable tools!
• Observe the current regulations on accident prevention
and safety for electrical devices during operation and
mainte-nance of the device!
• Before interfering with the system, always switch off the
voltage!
• Note that in systems under pressure, piping and valves
may not be loosened!
• Take suitable precautions to prevent inadvertent
operation or damage by unauthorized action!
• After interruption of the electrical or pneumatic supply,
make sure the process is restarted in a well-defined,
controlled manner!

Explain the working principle of variable frequency drive?

0 Answers   ABB,

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why we use the 4-20 mamp signal used for transmitter.

5 Answers   Tecnimont,

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Calculate the maximum pressure drop that can be allowed to occur across a control valve, so that we can prevent cavitation / flashing from occurring. Use the following formula: Δ P allow = Km (P1 – PvapourA) where, Δ P allow - the maximum allowable differential pressure for sizing purposes, or terminal pressure drop; Km- the valve recovery coefficient from the manufacturer’s catalogue; P1 - absolute inlet fluid pressure; PvapourA - absolute fluid vapour pressure at the inlet temperature; Use Atmospheric pressure = 101.3 kPa, P1 = 1200 kPa(g), PvapourA = 4 kPa, KM = 0.72

0 Answers  

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WHAT IS THE DIFF BETWEEN FREQUENCY AND INTENSITY?HOW IT WORKS IN FLAME SCANNER ?

1 Answers  

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for what purpose strain guage is used?

5 Answers  

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What is a snubber circuit?

2 Answers  

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What is the Main principle and formula for the steam flow compensation?

2 Answers  

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How to regulate the flow of Air in 4" line, with max flow of 330 nm3/hr and Pressure of 0.5 bar? please suggest the type of instrument required.

0 Answers  

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Could you explain to me the enraf (servo gauge) mechanism. How it works ? and how it is working on archimedes theory while it's not immersed into the surface? and how can we calibrate it ? Thanx

1 Answers  

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tell about various protocols used in different plcs

3 Answers   Emerson, Samtel,

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what is IEC code in cables & how to selecting cables?

0 Answers   ROS,

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how commission a transmitter evev plant is already running

2 Answers  

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