As to the issue of dumpster diving, I work for a local government and
we are forbidden to dumpster dive, but contractors are not. We can't
use public funds to buy stuff, then decide we don't need it anymore
and take it home. We can dispose of things in two ways, by auctioning
it off, or by making a contractor dispose of it as a part of a
construction project. The thought process being that if it has any
value, the contractor will reflect that in their bids.
you how many times I've watched PLCs, VFDs, control panels,
transformers, etc. go to the scrap yard, when I could have either
asked for it for free, or at least paid the scrap value to the
contractor. Since I administer the contracts, I don't even want the
appearance of conflict of interest, so I tearfully watch them go
away.
Some will recycle all metals, while others might use the money for
aluminum or copper to pay for a BBQ lunch for their employees.
Personally, I'd much rather see things that aren't recyclable such as
PVC pipe, go to a good use, rather than the landfill.
________________________________ From: Jim Lux<jimlux@xxxxxxxxxxxxx>
To: tesla@xxxxxxxxxx Sent: Tuesday, February 14, 2012 9:01 PM
Subject: Re: [TCML] secondary coil form
On 2/14/12 4:21 PM, Nick Andrews wrote:
I dunno, but I have a 10' piece of 12" C900 PVC blue water pipe in
my back yard I was thinking of winding a coil on. Wall thickness
is maybe 1/2" though, so it's not light at all! I 'found' it on
the side of a road where it had been sitting for a year after a
line was put in, so it was fair game. Took about 5 minutes to cut
with the cordless sawzall though. I have access to plenty of 6"
C900 (green water line-rated pipe) or 8" SDR35 (thinner wall
non-pressure) PVC on a sewer line project I am working on for NASA,
as we are putting in about 83,000 feet of sewer. Since I am the
Project Manager, I could claim ownership of any cut pieces to
use... Anyone try green or blue pipe and have issues with
arc-tracking?
Stick a piece in the microwave and see if it gets warm. It's a
decent test of conductivity.
A lot of low pressure pipe is actually a foam core with solid skins.
Most ABS DWV (Drain, Waste, Vent aka sewer) is like this. It's tough
to tell, even if you saw it, because the foam looks the same, it's
just significantly lower density.
Over the years, several folks on the list have used various and
sundry SDR type pipe, which is what I think you have, without
problem.
What you're really concerned about is whether the crud going into the
recycling extruder happened to be a batch with metal filings and
conductive "stuff". there's no way to tell, so some sort of test is
appropriate.
I don't know what would be good. Most coilers have a NST or
equivalent laying around, so that gives you a nice 15-20kV (peak)
test source. If you wrap two wires around the form, say, an inch
apart, and see if it breaks down internally?
[interesting that you are a contractor for NASA.. at the NASA
facility I work at, we're told that dumpster diving or scrap
collecting is strictly verboten. No taking empty boxes home, no
taking anything. Presumably there was some spectacular and egregious
issue in the past: "Oh, this gold bar is scrap, so I'll just pitch it
in the metal recycling bin"]
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