dang... this was from a movie i watched last week. i thought was still on my
hard drive... and i cannot find it now...
todd
On Thursday, March 15, 2012 1:46pm, "Steve Jefferson"
said:
Could you site a source for this?
I googled this and saw nothing like the 1 – 4 tons of coa
I did the pullout calculations for 5/16-18 bolts last year and found that to
be plenty good. After drill/tap 72 holes with a magnetic chuck drill I won't
ever do it again. It's way too labor intensive. And the 24 thread pitch,
which would have been stronger, was not available in stainless so we use
Yeah, Jay, I think Dynamic Fastener is where I saw the pull-out
chart. I believe that 1/4" is equivalent to #14 - can anyone verify
this?
So the question (to which I don't know the answer) becomes: in heavy
gauge steel (Lars mentioned "about 1/8"), will a 1/4 x 20
Hi Allan,
I get 1/4 x 20 self taping screws from.
I think they are even stronger than the TEK screws.
dynamicfasterner.com
Jay
Peltz power
On Mar 15, 2012, at 9:40 AM, Allan Sindelar wrote:
> Lars,
> This has been addressed before on this list, but its been awhile. #14
> self-tapping ("Tek
EJOTs are a German product designed for this kind of application. They have an
application note that discusses purlin thickness, thread size, and pull out
strength. Mudge Fasteners carries them in the US.
Jeff Irish, PE
President
Hudson Valley Clean Energy, Inc.
and Adirondack Solar
13 Hook Ro
Years ago I had my 15 minutes of fame on the old TechTV network’s show The
Screensavers talking about PV and solar energy and got that question at the end
of the show. I had just looked up that info and remember that while it varies
with manufacturer the numbers for embedded energy recovery for
PV energy "payback" is listed as 0.7 to 25.5 years, depending on the type
of module and the data you elect to use.
The preponderance of most opinion/data support 1 to 4 years as the period
for the equivalent embodied energy in a PV module to be produced by that
module, again depending on the modul
Never mind Jim, i found the attachment in your original post, under a different
'subject' title.Thanks,benn
DayStar Renewable Energy Inc. benn@daystarsolar.ca780-906-7807 HAVE A SUNNY DAY
From: b...@daystarsolar.ca
To: re-wrenches@lists.re-wrenches.org
Date: Thu, 15 Mar 2012 14:37:41 -0600
Could you site a source for this?
I googled this and saw nothing like the 1 – 4 tons of coal on the first 5 pages
of results.
Everything I read and the few power points (even one from 2000) stated that a
single module will start creating more energy than used to make it in the 2-5
year range.
I was told a few days ago that a PV module will likely never produce the energy
it took to make it I bit my lip, disagreed and wished i could recall in
detail what i had read in one of the reports/articles i had read in the past on
this topic. From what i can remember it is about 2-3 yrs.
Todd,
So true, thanks for the reality check. An energy survey is required here in CT
if you want rebate money.
Larry Liesner
Sent from my Verizon Wireless BlackBerry
-Original Message-
From: toddc...@finestplanet.com
Sender: re-wrenches-boun...@lists.re-wrenches.orgDate: Thu, 15 Mar 20
i think bob o once said he used ss pop rivets on a job like this.
todd
On Thursday, March 15, 2012 9:26am, "lars Ortegren" said:
Wrenches,
We have a project coming up where we are installing a large array on a low
slope metal building with metal purlins. Typically we would through bo
i recently read that it takes the equivalent energy of between 1 and 4 tons of
coal to make a single pv module. this is why i insist my customers do their
efficiency upgrades and learn how to be frugal/conserve before i will even talk
about pv with them.
renewables powering waste is old parad
Lars,
We looked into this and found some "threaded pop rivets" they were
stainless steel and you had to buy the tool and then you just drill from
the top, insert the pop rivet that leaves a threaded shaft facing skyward
that you could attach L feet or other attachments to with a nut and
washert
Lars,
This has been addressed before on this list, but its been awhile.
#14 self-tapping ("Tek") screws have phenomenal pull-out strength in
standard steel purlins. My advice is to research this through your
fastener supplier; I have seen charts on pull-out strength of
Wrenches,
We have a project coming up where we are installing a large array on a low
slope metal building with metal purlins. Typically we would through bolt our
attachment to the purlins, but in this case the building is a self-storage,
and access is not an option. Does anyone out there have expe
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