My compressor use is limited to using a carry tank for filling tires
and very small brad-nailing jobs. The tank used to scare me, thinking
of the energy contained in 125 lb of compressed air. And now I see
that my tank has an "expiration date" (already passed) embossed on it.
And I'll get rid of it if it is a danger. But I was thinking--what
does happen if the tank fails? It's not like a bomb, where there is a
near-instantaneous increase in pressure that tears the tank apart. It
seems to me that what is likely to happen is rust will create a thin
spot that will eventually fail, releasing rather unspectacularly all
the air in the tank.
Is there any safety risk in using an "expired" tank?
Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently.
Depends on the condition of the tank. If it is solid, no internal rust, it
can last for many more years. I can't see it from here, nor do I know the
condition and past use so I'm not going to give my OK. I'd tap it with a
hammer at the very least to feel for rust spots. Proper testing is either
using ultrasonic equipment or pressure testing.
I have never heard of an expiration date on a tank. Sounds more like a
tactic to generate sales down the road. Typically a tank will eventually
rust inside and a pin hole will developed. The hole will leak and it will
All three of my 12 gallon storage tanks have expiration dates stamped
near the valve. 20 lb. Propane tanks have had them even longer.
> Sounds more like a tactic to generate sales down the road.
More likely, someone sued and stupidity ensued.
Yeah, I am not sure what the OP has. The title talks about "compressor tank
failure". Then he mentions carrying around a tank for tires and small nail
jobs. I have carried a small tank compressor to a location with no
electricity and used it to nail a few pieces of trim. IIRC I have seen
dates on the stand alone tanks.
If you are involved with SCUBA or hp gasses you would have heard of
them. They show when the tank needs to be inspected (anually) and
pressure tested (around every 5 years) if it is a steel tank the falure
mode is usually not explosive.
Both ally and steel tanks have been known to last well over 30 years.
However as the usual working pressure is around 200 bar they have much
stronger walls than most compressor tanks, and the fill is (should be)
0% water so less (0) rust.
-- >replace spamblock with my family name to e-mail me >Pics at http://www.meekings.net/diving/index.shtml
Uh, wrong, certain small sizes are exempt but larger tanks (depending on
capacity and dimensions) have expiration dates including scuba tanks, airgun
tanks and so on. Metal tanks are usually good for five years between hydro
recerts, fiber-wrapped tanks from three to five years depending on the
design. Fiber-wrapped tanks can only be recertified three times and then
have to be destroyed, but all-metal tanks are good so long as they pass
inspection and testing, I've seen fifty-pound CO2 tanks with the earliest
markings being WWII-era. In the U.S. this is federal DOT law BTW, although
you'll also find additional local requirements, e.g. there are states where
you can't get a scuba tank refilled if it doesn't have an annual interior
visual inspection sticker even if it has a current hydro-test certificate.
Tanks generally don't develop pinhole leaks that eventually get larger, when
they fail they fail suddenly and usually catastrophically. If you don't
believe any of that get down to your local scuba shop and ask them, they get
bulletins on tank failures and can show you photos.
You are talking HIGH PRESSURE tanks.
Normal compressor tanks run 150psi max and I've never had one
hydrotested. My current tank has a hydrotest date on it because it
held propane for over 20 years, then sat for several years before
being put into service as an air compressor tank.
We had a 30 year old truck fuel tank (round saddle tank)that we used
as an air tank for over 10 years that did rust through at the bottom.
It was brazed twice before we stopped using it (I think one of the
guys took it home to use - was at our car club at the time)
In the ten years I was service manager at the Toyota dealership the 80
gallon tank was never recertified, and it was the same tank that had
been hanging on the wall10 years earlier when I worked in the same
shop as a mechanic.
Still yoyo'ing ... damn u-Verse was rock solid for 3 months, now 'suddenly
last sunday' it starting bouncing like a rubber ball. 10 hours of dealing
with technicians yesterday (they left here at 10 PM) and still no joy,
I kinda went through the same thing back around 2000 with ATT DSL. I and
perhaps you are fortunate that it was and is new to your area and have the
benefit of a technician actually working directly with you..
Any way, I forwarded you an e-mail that I got from Christy George with
Riverway. I think it was in response to my e-mail I sent to her last week
about the contract cancellation. I pretty much let her know what I thought
about people that did not hold up their end of the bargain and mentioned
that no opt outs were mentioned on the telephone when the called me to sign
Her e-mail said,
Dear Sir or Madam,
Riverway Power values its customers and after reviewing the plan
cancellation notice sent to you earlier, we have kept your rate plan the
same and no adjustments will be made. Please disregard the previous notice.
Please accept our apologies for the inconvenience this may have caused.
Kinda looks like a form letter so you might get one too.
Also I have some drawings for you so let me know when your e-mail is working
or I can come by and show you. There are some issues I have with the posts.
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