On 9/4/12 6:20 PM, Jim Thomson wrote:
## speaking of cranes. I have used 20 ton cranes, etc, for various
tower projects since 1980.....and they ALL have something on their
cables, none of em are dry ! Its NOT grease either, so it must be
pre-lube 6 etc. Im getting a crane over here for another project
pretty soon, so will ask the fellow about the cables, and what they use
on em.
The link posted earlier referred to petrolatum (aka Vaseline) in a
solvent as a cable lube, particularly with a fiber core. That might be
what you're seeing.. (and for all we know, that's what PreLube is)
THis is the mfrs web site
http://www.grignard.com/Wire-Rope-Lubricants/
the MSDS says it is composed of:
Cas: 64742-52-5
RTECS #: PY8035000
Name: DISTILLATES (PETROLEUM), HYDROTREATED HEAVY NAPHTHENIC
OSHA PEL: 5 MG/M3
ACGIH TLV: 5 MG/M3
------------------------------
Cas: 24937-78-8
Name: ETHYLENE-VINYL ACETATE POLYMER
------------------------------
Cas: 64742-53-6
RTECS #: PY8036000
Name: DISTILLATES (PETROLEUM), HYDROTREATED LIGHT NAPHTHENIC
OSHA PEL: 5 MG/M3
------------------------------
Cas: 61790-48-5
Name: OIL-SOLUBLE PETROLEUM SULFONATE, BARIUM SALT
Jim VE7RF
----- Original Message ----- From: "Jim Thomson" <jim.thom@telus.net>
To: <towertalk@contesting.com>
Sent: Tuesday, September 04, 2012 4:22 AM
Subject: [TowerTalk] Crank-ups.....do NOT lubricate your cables
Date: Mon, 3 Sep 2012 17:22:15 -0700
From: Jim Lux <jimlux@earthlink.net>
To: Steve Maki <lists@oakcom.org>
Subject: Re: [TowerTalk] Crank-ups.....do NOT lubricate your cables
from US tower
I suspect that rigging companies and crane ops also do regular
inspection and cleaning of those cables too, just like the ones on
gondola and chair lifts.
On Sep 3, 2012, at 17:05, Steve Maki <lists@oakcom.org> wrote:
I wonder why crane companies keep their cables (on million dollar
cranes) lubed religiously?
On this particular topic, I would not place much faith in the
manufacturer's edicts, unless you're looking for a reason to keep
busy replacing the cables more often than otherwise needed.
-Steve K8LX
## all the local ship yards around here have 55 gallon drums of
pre-lube 6, 9, + 11. This stuff is literally
poured onto those cables, right at the drum, via an oiler device.
Its just penetrating oil, to lubricate the inner strands.
Nobody is changing cables every 3 years. UST also wants me to check
the oil in the gearbox every month, and also
change it out every 2 years. Turns out those hub city gear boxes
were never meant to be used for lifting applications.
They were designed for stuff like conveyor belts, etc. They are
actually called ....speed reducers. They were never intended for
a hoist application. The UST control box on the tower is not water
proof nor is enclosed in anything remotely close
to a nema box. Whoever designed their anchor bolt configuration +
rebar cage on the HDX-689 was clueless. Neither
meet any spec here in town. If you put a 14 foot mast out the top of
their tower, you can kiss that 70 mph rating goodbye.
I wouldn’t be using the UBC-97 exposure B specs either, use exposure
C, or use the RS-222 rev g specs....if you can find em.
The story I got from the crane and ship yard folks is... without the
use of the various grades of prelube slopped onto the
cables, the inner strands can rub together..and break. You cant see
internal damage from the outside.
It would be nice if UST provided detailed instructions on how to
re-cable their towers. They insist you recable their
towers, but then wont provide the info. Check out their info on how
much torque required for both the anchor bolts +
leg bolts..... answer, snug fit. What kinda BS answer is that.
Jim VE7RF
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