Could anybody pls give ans of boiler 3 element control system?

5 Answers   Qatar Petroleums,

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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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for oil & gas industries which zone is normally preferred? why? give its example?

0 Answers  

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What is the difference between fiber optic cable & Ethernet cable

2 Answers   BEMCO, CCC, Pidilite,

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Can a Differential Pressure Transmitter be used as a normal pressure transmitter??

3 Answers  

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warning lamp does not light, but it does light when the wire from the lamp going to the sending unit is grounded (the part that plugs into the sending unit) what does this indicate)?

1 Answers  

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What should be the stanchan Height for installation of Smoke detector & toxic gas detector in field,according to qatar standard

2 Answers  

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what are the definitions of input, output, command & signal according to instruments controlled by PLC using DCS System?

0 Answers  

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How much voltage we are using at switches?

4 Answers   Edac,

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What is negative range in transmeter?

1 Answers   TCL,

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what is difference b/w the solinoid volve and autodrain?

3 Answers  

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What is DCS?

4 Answers   GAIL, Sabic, Trident, Yokogawa,

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