I am designing an ETFE seat for a ball valve but I don't know if the ETFE can handle radiation level of 1x10^5Gy/40year. I have a document saying that ETFE can handle 1x10^8 rads but how is it related to 1x10^5Gy/40year?
although technically byrdj is correct - dose per unit time is rate - i think that the 40 year timespan is coming from what a concept similar to committed dose i.e. dose accrued over a life-span.
i'm presuming that the radiation you're talking about is either a gamma or neutron field - 10^5 grays would be 10^7 rads so you could view your 10^8 rads figure in two ways 1)the total dose which exceeds your 10^5 grays over 40 years by a factor of 10. 2) you would need to find out if the 10^8 grays is total or based on some unit of time to make sure you weren't exceeding a dose rate.
regards HM
No more things should be presumed to exist than are absolutely necessary - William of Occam
Radiation effects over time cannot be "assumed" very well: the difference between (very high) energy gamma, (medium energy) gamma, X-ray, thermal and high-energy neutrons, and simple heat stress over time gets very complicated: Different material react differently to each kind of different radiation damage.
Don't relate "biological equivalent radiation units" to simple metallic damage either: equal (or convertible) biological doses will still have physically different effects in different materials, and a material defect that a cell can "regrow" or "replace" will never go away in a crystal or plastic part.
If you can't duplicate your requirement in the literature, Run a simple test (at SWRI or someplace equal research institute) of "what radiation" at "what energy" at "what rate" hitting "what material" at "what temperature"?
Don't assume conditions: Higher temperatures might "repair" interstitial impact damage, or might make it worse. Higher energies will likely make damage worse, but higher energies might be between resonance points and be less damaging.
Southwest Research Institute - a private (fee-based) facility in San Antonio TX that does long-term fatigue and stress failure (vibration-induced) analysis, along with lots of other areas of practical materials research.
They're nuclear-licensed - so they can handle and be environmentally safe checking out and disposing of radiation-enhanced test materials, and have tested some nuclear-grade materials and welds for some of the power projects I've worked in the past. Also aerodynamic and metals testing.
Regrettably, that same license familiarity and proven ability also increases fees. 8<(.
As a 3D printer owner, you may be already reaping the benefits of 3D printing, such as rapid production, design freedoms and easy access to fresh prints of the machine. We dive into scenarios to help you decide when you need to outsource your project to a service provider.
Download Now
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. Download Now
Keeping track of changes to complex products is difficult—think Aerospace & Defense equipment, new generations of commercial aircraft, and software-based automobiles. A new way to managing the digital context of the physical product is required and the answer is the Digital Twin. This ebook explores the opportunity available for Operations and Maintenance for the Digital Twin. Download Now
Substantial progress has been made in filtration technologies in recent years. New filter media materials, designs and processes have led to filters that are more efficient, reliable, compact and longer lasting. This white paper will discuss the various trends that are impacting operational responsibilities of MROs today and the resources that are available for staying up-to-date on the latest filtration solutions. Download Now
Talk To Other Members
RE: Radiation unit converstion
I am designing an ETFE seat for a ball valve but I don't know if the ETFE can handle radiation level of 1x10^5Gy/40year. I have a document saying that ETFE can handle 1x10^8 rads but how is it related to 1x10^5Gy/40year?
Many thanks,
RE: Radiation unit converstion
The radiation absorbed dose is measured in Gray, rad, rem and Sievert (Sv).
1 rad = 1000 mrad = 10 mGy = 0.01 Gy
so 1X10^5Gy/40year would be a rate
RE: Radiation unit converstion
although technically byrdj is correct - dose per unit time is rate - i think that the 40 year timespan is coming from what a concept similar to committed dose i.e. dose accrued over a life-span.
i'm presuming that the radiation you're talking about is either a gamma or neutron field - 10^5 grays would be 10^7 rads so you could view your 10^8 rads figure in two ways 1)the total dose which exceeds your 10^5 grays over 40 years by a factor of 10. 2) you would need to find out if the 10^8 grays is total or based on some unit of time to make sure you weren't exceeding a dose rate.
regards HM
No more things should be presumed to exist than are absolutely necessary - William of Occam
RE: Radiation unit converstion
Don't relate "biological equivalent radiation units" to simple metallic damage either: equal (or convertible) biological doses will still have physically different effects in different materials, and a material defect that a cell can "regrow" or "replace" will never go away in a crystal or plastic part.
If you can't duplicate your requirement in the literature, Run a simple test (at SWRI or someplace equal research institute) of "what radiation" at "what energy" at "what rate" hitting "what material" at "what temperature"?
Don't assume conditions: Higher temperatures might "repair" interstitial impact damage, or might make it worse. Higher energies will likely make damage worse, but higher energies might be between resonance points and be less damaging.
RE: Radiation unit converstion
Ultimately i wouldn't expect someone to design a seal (or anything for that matter) for 40 years with no maintenance regime.
Kind regards, HM
No more things should be presumed to exist than are absolutely necessary - William of Occam
RE: Radiation unit converstion
They're nuclear-licensed - so they can handle and be environmentally safe checking out and disposing of radiation-enhanced test materials, and have tested some nuclear-grade materials and welds for some of the power projects I've worked in the past. Also aerodynamic and metals testing.
Regrettably, that same license familiarity and proven ability also increases fees. 8<(.
RE: Radiation unit converstion
unfortunately add the word nuclear to anything and cost seems to spiral...bit like the word wedding
Cheers, HM
No more things should be presumed to exist than are absolutely necessary - William of Occam
RE: Radiation unit converstion
Looking for radiation effects on valve seats,PTFE,UHMWPE,PEEK,etc
Also materials such as 316 stainless and alloys etc
Anybody got any info or stites etc
Thanks
Charlesan