ESD solenoid valve reliability
ESD solenoid valve reliability
(OP)
How can we ensure the reliability of ESD solenoid valves? which combination is better (two solenoids in series Vs parallel, 1oo1 Vs 2oo2 logic) if we have redundant solenoid valves to initiate tripping.





RE: ESD solenoid valve reliability
For codes and standards, what type application such as hydrocarbon process, toxic, heater fuel system, and what country, etc.?
RE: ESD solenoid valve reliability
2. what type application? FLUE GAS VALVE TO POWER RECOVERY TRAIN (EXPANDER).
3. absolutely trip if required? YES
4.country? INDIA.
RE: ESD solenoid valve reliability
If your failure was from a loose coil, isn't that a maintenance or component quality problem? It doesn't matter how much redundancy you have if the equipment isn't being maintained or so is shoddy that there's basically no inherent reliability. Your design is only as good as the components that you selected for the fabrication.
What monitoring are you doing to determine whether any valid operation is executing correctly?
TTFN
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RE: ESD solenoid valve reliability
what i was asking that if we put 2 solenoid valves in parallel instead of series, what are advantages and disadvantages.
RE: ESD solenoid valve reliability
If you are being troubled by accidental actuations, one
would think that twice as many false actuations from shoddy components would be a serious disadvantage, no?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: ESD solenoid valve reliability
You can use [quote] original text [/quote]
to differentiate between questions and answers or just use different colors [blue] original text [/blue]
original text
In series if either coil opens they both drop out.
If one coil shorts the other may soon short too as it now has twice the voltage across it.
In parallel if one coil opens the other continues.
However if one coil shorts the other will drop out because the circuit protection will trip due to the short.
If you have faulty installations though, as IR is undiplomaticly pointing out, all the safety schemes in the world probably won't help.
Keith Cress
kcress - http://www.flaminsystems.com
RE: ESD solenoid valve reliability
I know I am chiming in late, but is it common practice to have IS instruments (solenoid valves) on the same circuit (in series) and are you doing interlock testing on these loop for loop integrity? From a reliability stand point this is a way to check your equipment (maybe annual) and collect data in regards to mean time between failures (MTBF) which can possibly predict when a component of the loop will fail.
RE: ESD solenoid valve reliability
I absolutely agree with your 'plumbing' suggestion. That's the way.
Keith Cress
kcress - http://www.flaminsystems.com
RE: ESD solenoid valve reliability
"Theory is when you know all and nothing works. Practice is when all works and nobody knows why. In this case we have put together theory and practice: nothing works... and nobody knows why! (Albert Einstein)
RE: ESD solenoid valve reliability