On drum level, why we are using air to close Control valve?
- 4 Answers
- 7784 Views
- L&T, I also Faced
- E-Mail Answers
Answer Posted / carl_ellis
If the valve's actuator is Air-to-Close, what state does it
fail-safe state?
Check out the article, "How to destroy a boiler - Part 1"
at this link:
http://www.nationalboard.org/index.aspx?pageID=164&ID=238
and scroll down a couple pages to the section entitled "Low
Water Conditions".
The description will provide details that help you
understand what the fail-safe state due to the loss of a
control signal on a boiler feedwater control valve should
be.
Carl Ellis
Measure First
| Is This Answer Correct ? | 4 Yes | 3 No |
Post New Answer View All Answers
Give Detail information about plc,dcs,and scada system?
What is the constant voltage unit?
We Have Two Field bus Pressure Transmitters of Different Sensor Range (I.E One is of Lower range and Another is of Higher Range).Is same Process Line. My Question is Can i provide Saturation Limit to my field Bus Transmitter as We can provide Saturation current limit to HART Instruments. As During Low Pressure Both Working OK ,But During High Pressure, transmitter with Lower sensor range Goes to Fault mode as Beyond its Sensor Limit it can Measure, So may I provide Saturation point Some where to Suppress This Fault during High Pressure.
what about your moleg in pogrees with company
please any body have most important data for study for saudi aramco test of instrument QC thanks email shahnaveedullah@gmail.com
Where is wet leg is used?
How vortex sensor used for steam flow measurment can be checked on line i.e without taking out from process line.
what is the PC interface and software for connection to ABB logic module “ LM011-CE18RAC “ ( for Programming ) ??
what is different between 2,3&4 wire rtd and how much maximum distance using plc to field.
we are using centum vp as monitoring with Dell precision work station T3600 but some times PC(s) are restarted automatically . how we can solve this problem? thanks
a flow transmitter [range-0-400mbar] connected in process line. please explain me how to calibrate the flow transmitter , & how to do static error
which processor is used in dcs.
How many interlocks at turbine side?
What is ultrasonic flowmeter?
, Instrument Index, P&ID review, I/O schedule, datasheet, DCS / Analyzers specifications, loop diagrams, hook-up drawings.
