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Post by red on Nov 2, 2015 11:36:55 GMT -8
Luis, I see you redacted out the REE numbers you posted? (Or someone did.)
HTF does one find a hydro shop that understands what "CGA" means, let alone knows how to figure a REE number for a tank in order to plus stamp it again? I've never seen a REE stamp (not that I ever went looking for one) and the CGA doesn't seem to respond to enquiries very quickly. The shop that said "no problem" to me changed their story and said "Oh, uh, well, we thought there would e a number on the tank"....
More bozos on the bus.
From what I read in CGA5, and from what I read in the DOT letter, it should be this complicated. If the tank remains within the acceptable original limits of expansion...the rest is totally redundant and can be ignored, can't it? At least, that's what the papers from DOT can be read as saying.
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Post by luis on Nov 2, 2015 18:45:31 GMT -8
I don't know what you are referring to. Please explain.
There are two REE numbers on my second post.
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Post by red on Nov 2, 2015 19:55:46 GMT -8
Huh, I could have sworn I looked twice and that post for the 96's had disappeared from the thread.
So if the CGA method requires REEs from three tanks, and you have two and I have a third....How did you measure the wall thickness? Special calipers, or ultrasound? Something I'm not likely to have access to?
It would be nice if we could establish a REE for these tanks, in case some of the rest of them have survived and are lurking around someplace. I saw someone posting a couple of used ones, but at that age with unknown use on them I wasn't really motivated.
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Post by red on Feb 15, 2016 12:02:27 GMT -8
Luis- I finally found a professional hydro shop, that allegedly has ultrasound equipment and all. CGA conveniently "does not disclose" who their members are or how to find one...talk about peculiar.
Anyway, this pro shop said gee, calculating a REE was all news to them and they'd try to look at CGA5 and see what it involved in the next week or two, but they'd never done it before. And reading CGA5 left me with a headache, I read English and CGA5 ain't quite that.
Can I ask what you did to determine the REE number of your PST 96's? Maybe this shop can do the same thing, following your steps, and then we'll have three tanks and three numbers and can get someone to believe the damned things won't mysteriously explode and kill all the other unicorns?
--Red
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Post by red on Jun 26, 2016 17:02:33 GMT -8
Luis- An old thread but "it ain't dead yet". If I may ask you, you mentioned a spreadsheet you could share? And that the 20 wall thickness measurements you made were more than required, but didn't say how many were required? And "Let me know if you have trouble finding the letter from PST requiring the pre-hydro procedure."
All of which I'd appreciate hearing the rest of.
I have, in the months since, asked several hydro shops about whether they had any equipment or familiarity with determining wall thickness. Like they say about Radio Shack, "You got questions? We got blank stares." I'll say no one within three large counties can determine wall thickness. I did find a company that makes the ultrasound test equipment, but that's a fast thousand bucks and they have no local "hydro test" customers, they say.
Should I rashly guess you own ultrasound test equipment? Or just a very unusual pair of calipers?(G) How did you do it?!
And with the tank that came so close to your calculated REE number, since they were supposed to be designed and tested for 100,000 cycles to get the 3AA rating, do you think your numbers may be too conservative? Or your tanks just not aging gracefully? (Or they were on the thinner side of the production run?)
I heard something about the DOT aiming now for "not more than 10% REE" instead of worrying about exact numbers on the newer certifications. Any word on that?
And if you want that last set of parts for a Sherwood J-valve...let me know, I'll give you the phone number to get it.
--Jared
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Post by red on Mar 29, 2017 19:15:47 GMT -8
Luis- I have been put in contact with someone in the industry who generously said "send me that tank and we'll get the REE number and + hydro it". This may not be until the winter, but it looks like it will happen, and then there will be a THIRD TANK to keep the DOT happy about having a REE number from a larger sample of tanks. Are you interested? We would need to. what. submit the papers from all three?
Red
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