Answer / janak joshi

plc panel consist of relay cards and in plc we program the
same address we use in dcs programming.we generate o/p from
relay card to rthe field

Why do we floating DC in DC system.

0 Answers  

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What is ultrasonic flowmeter?

0 Answers  

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Why we are using reverse action in displacer types level transmitters on some Vessels?

0 Answers  

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what is cavitation in control valve? & how we can avoid it?

1 Answers   Forbes Marshall, Reliance,

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What is Integral and Derivative control?

5 Answers   Qatar Petroleums,

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what is droop in governer ,type of droop ,how it work

0 Answers   TATA,

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what is difference between call out and call log

0 Answers   Petro Rabigh,

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Conversions

0 Answers   CCIE, Nestle,

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How many interlocks at turbine side?

0 Answers   Edac, SRF,

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Make Heater Process Logic.

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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What is Process portal A(PPA)?

1 Answers   ABB,

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