How to calculate the failure rate of solenoid valves
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How to calculate the failure rate of installing one solenoid valve and the failure rate of using two solenoid valves simultaneously? I seek advice from experts
Hehe, in the digital age, even for an electromagnetic valve you need to do probability calculations: lol. I don’t have any educational background and don’t understand such calculations.:) I have a suggestion – should we consider the potential harms that could arise if problems occur? Is there a time for replacement processing?:lol
Is this installed in parallel or in series?
I only know that for some other reasons, things that didn’t need to be installed were added anyway; naturally, more components mean more chances of failures.
This modification should improve safety performance; in the event of damage, it will cause an interlock shutdown of the entire plant
Once a failure occurs, the entire plant comes to a halt
Each valve theoretically has a failure rate, and this rate increases when valves are connected in series
If the solenoids on the valve are connected in series, both solenoids need to lose power simultaneously for interlocking to occur and the valve to close (which is equivalent to addition in logical mathematics). The parallel configuration of solenoid valves is equivalent to interlock 1oo2, while the series configuration is equivalent to interlock 2oo2. The failure rate is calculated in the same way as that of other instruments.
The “entire plant” you’re referring to is just a system. Even if you install a spare, there’s still a possibility of accidents. The accident rate of solenoid valves these days is already very low; it’s likely you’re just worried and want to add an extra layer of safety on top of the original design. If an additional system is added, that additional system too will have a backup system; and if there are problems with the backup system, it could affect the entire system. It is recommended that, unless you are a designer, it is best to stick to the original design. Solenoid valves can have problems related to the electrical circuit, as well as issues with the pneumatic system, and problems related to their mechanics and seals. The valves that are used frequently are flexible and easy to use, while those that aren’t used often get stuck or malfunction in various ways. It is best to follow the original design.
Yes, I want to use specific numbers in the report now, but I’m not sure how to express them. If I use mean time between failures, then how should I calculate it when there are two of them?