Define the difference between a stable versus an unstable controlled system and some of the tools you might use to be able to detect when this is happening and assumptions used for control system application design that could contribute to instability

0 Answers  

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In control valve there are two type of valve seat we can use metal to metal seat & soft seat.On this valve seat i have following doubt. 1)I have never seen practically the internal assembly of valve so my doubt is that basically weather the seat is soft seat or metal its basic MOC is same as valve body(SS or CS) only in soft seat we are using PTFE ring & place on valve seat & in metal this PTFE ring is not threr am i correct??????? 2)what are the common general rule for using metal to metal seat & soft seat,means its depend on process parameter like liquid,gas, steam & on valve leakage class.

1 Answers  

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Why capacitive banks ar5e important?

5 Answers   Siemens,

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why relays are used with plc?

4 Answers  

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Programmable Logic control.

0 Answers   CCIE, NCVT,

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What are different types of valves?

0 Answers  

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if in a level tx height is given, how u calculate the ranges of the tx?

2 Answers   Bombay Rayon Fashions, Invensys,

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Why DP level transmitter preferred for closed vessels and Radar level transmitter for open tanks??

2 Answers  

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how to calculate range of level transmitter?

0 Answers   TCE,

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how will you check torque value during Factory acceptance Test for control valve/ESD ON/OFF VALE how will you confirm this torque value is being correct, Which document will you be refer.

0 Answers  

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whats diffeence between dcs & scada operation.

3 Answers   Orchid, Reliance,

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what is the difference between SCADA and DCS?

5 Answers   ACC,

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