Ever seen the results of a pressure vessel failure? I saw one about
thirty years ago that sent shrapnel over 50 yards.
In the UK, if the pressure vessel is used in commercial premises then
26 months is the maximum period between statutory inspections. The
rest of the world may vary (and usually does!)
Catastrophic overpressure failure is a completely different thing than
the possibility of a rust pinhole developing after 50 years or so...
I'm simply commenting that daily water buildup in a low-use, low-volume
homeowner/home-shop environment is somewhat excessive...
And, yes, I've seen results of high-pressure water/steam having been 30+
years associated w/ power generation facilities there have been a
couple. But they're much higher pressure and much higher temperature
events (1000-2000 psi, 600-1000F typical).
Most air compressors of this caliber are never pressurized much above
100psi anyway. I can't imagine a tank "blowout" at this pressure
causing much harm at all, other than a loud noise and perhaps some
See Nad. See Nad go. Go Nad!
To reply, eat the taco.
Bingo. But if one is determined to be afraid of one's compressor then
rather than agonizing over how it is going to explode and kill them one day
they should take steps that allow it to explode with impunity and then stop
worrying about it. Of course if they aren't happy unless they're worrying
about something I guess a compressor is as good a target for recreational
worrying as anything.
On Wed, 13 May 2009 16:24:18 -0400, "J. Clarke"
Never seen that term before, but it captures the concept beautifully!
An armed society is a polite society.
Manners are good when one may have to back up his acts with his life.
Robert A. Heinlein
The tank itself (particularly if it is ASME-rated; some of the no-name
imports that aren't rated I might worry just a little about a weld
failure) is pretty unlikely to be an issue.
What I have seen that can be injurious if not lethal is the
shock-induced fracture of larger plastic pipe used as reservoirs in a
shop air system. It was cold (-20F outside, unheated shop building
probably about 0F inside) and a tool fell from a wall hook and hit one
of these. It scattered pieces around like that if got you in a tender
spot could have done some damage.
I abandoned the idea of plastic lines then and there for the barn. :)
Altho I think a 1/2-3/4" distribution line wouldn't have sufficient
material volume to be a major deal, I decided it wouldn't be a smart
idea even if cheaper... :)
That was ages ago long before I ran across the OSHA directives, etc., ...
Copper Oxide - the black power inside - must be filtered out
or it will clog any tool.
Having a quality filter at each site to trap the fine dust might
Dryer at the front helps any pipe system.
Ed Pawlowski wrote:
The price of copper has come down quite a bit over the last couple of
1/2" x 10' Type M copper pipe - $6.76
1/2" x 10' Type L copper pipe - $9.68
A few months ago I paid $68.00 for a 250' roll of 14/2 Romex. Last week
it was down to $23.00.
It was the contractor price at one of out local building supply places,
Lenco Lumber. I checked their web site this AM and their regular price
without the contractor discount today is $34.29 for 250'.
Type-L was $8.80/10ft hunk on the way home. Quick disconnects are
$3-$5 each and 1/2" copper to 1/4" pipe fittings are over $3! Yeah,
it's still pretty cheap. ...and it's so easy to work with (damn I
hate the PEX in my new house).
No one is 'living in unreasoned terror of their tools' A statutory
internal inspection of a pressure vessel might *never* find anything,
but the defined periods and limits of that inspection are based on
many years of practical experience, and nothing in that knowledge base
can currently justify extending that inspection period by a few months
let alone a few decades. It's absolutely bugger all to do with
overpressure and regardless of the normal operating pressure the
regime of inspection is identical.
A typical 100psi portable compressor typically used in close proximity
to the work with portable tools might be viewed as more dangerous in
failure than a 3000psi compressor used in air blast HV switchgear as
for most of the time no one is anywhere near them when they are
operating and they use chain mail screens to limit damage to the
building and adjacent equipment.
Anyone operating a pressure vessel for 40 years with no internal
inspection IS living on borrowed time, that's not just my opinion but
that of thousands of professional pressure vessel inspectors,
insurance companies and health and safety legislators worldwide.
So, I'm NOT alone....although you got me by maybe 5 years. I had
thought the tanks were lined in glass, someone told me that once... Now,
I'm thinking metal rusts slower under water than just being damp? If
damp metal is in contact with air, it rusts quickly. Not much air in
water, so, leaving it in might be better than draining it every day?
Just wondering why my 30 gallon tank hasn't collapsed in a pile of rubble?
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