I detect the disc immediately after a opening (either fully tearing at score or a small slit/pinhole, the latter is for this discussion) and the examination is continuous during pipeline process for maybe 24 hours or more. One side of the film is fluid (liquid or gas) the other is atmeosphere...
My application is:
1. Disc material is stainless steel (resistivity is 7.5E-7ohm-m, non magnetic) but sometimes uses nickel (magnetic).
2. The examination is done when it is installed in the pipeline but we can isolate the disc from the disc at the flange.
3. Score is pre-made and I am...
Thank you , Andy.
Do you have some idea on how to measure the change in resistance of such disc (say 6in in diameter and 0.005in in thickness)? The resistivity of metal is about 10E-8. This is a nice idea (simple to implement) if I find a way to measure the R properly.
Thank you. Our thin metal disc is used inside a pipeline and block fluid from one side to the other. When over pressure, it breaks at score and release fluid. Need to send fail-safe signal as breaking.
This method also report peak signal in score area without breaking through. I also hope...
The thin metal film is scored with some pattern to 50-80% of its thickness. When exerted shear stress, the film will crack/open at score. I wonder what simple/practical techniques can be used to detect its pinhole or opening in real time?
Thanks so much! That is really a direction I like to dig into. One concern is that most piezo element's Curie Point is below 250 degree, and our requirement is higher.
Another question is that I yet don't know how to model the flow noise into force/stress and what kind of filter is needed?
Thank you very much, Danger. You are my first suggester and have provided your best thought!
Answer your questions:
1. One is to monitor the total electrical resistance across the disc. Wouldn't that change if it fractured?
I checked this idea before, the resistance of the broken disc...
I am to design a sensor element that can detect a leakage through a thin metal disc (rupture disc) in a pipeline.
Ideally, the metal disc closes the pipeline at the upstreaming side with certain pressure. Its downstream can be either open to atmosphere or close. When a higher pressure occurs...