The schedule rating of pipe is not conduit perse' as conduit does not
undergo pressure testing but it does get zinc plating, that has little
to do with your question which was aimed more at strength. I have been
serviceing electrical equipment over 20 years and have never heard of
schedule 80 offered in conduit but it may well be galvanized pipe which
is just about the same thing, with better thread cutting to offer a
mechanical seal. Schedule 40 which is the standard in gas and most
liquid and chemical transfer plumbing at 2 inches has an outside
diameter of 2.375 and inside 2.067, 1 1/2 inch pipe has an OD of 1.900
and sch40 ID is 1.380 - if you choose sch80 product the OD remains the
same but the ID is 1.939 and 1.500 respectively, depending on your
budget this may be available galvanized - it is often 1.5 to 1.8 times
the cost of black which can be mechanically coated with 2 or 3 coats of
outdoor oil paint depending on your labor costs. The strength
improvement is obvious and if you do the math for 30k tensile you will
see the changes, the weight per fott increases also from 2.72 to 3.63
with 1 1/2 and 3.65 to 5.02 on the 2 inch, for wind loading with 1 1/2
the gyration radius drops from 0.6226 to 0.6052 and 2 inch from 0.7871
to 0.7665 per foot. When I construct antenna supports from mechanical
pipe product I always close all ends with galv caps and teflon tape to
reduce moisture transfers resulting in decay from internal oxidation,
and then paint everything several times with aluminum paint where pipe
wrenches and threading ruin the galvanized coating.
"Daron J. Wilson" wrote:
>
> I need to raise a full size Sinclair collinear up about 20 from a
> substantial "I" beam steel mount. I've got access to schedule 80 steel
> conduit, as well as other pipes, but am not sure how that compares to a
> 'reinforced mast', other than it is heavier. What do they do to
> reinforce a 2" mast? Obviously if I can use what I have it would save
> money, I had thought of dropping a piece of angle iron inside the full
> length, drilling holes and welding all three edges of it where it
> touches the pipe several places along the way and then replating, but
> that sounds pretty heavy.
>
> Daron J. Wilson, RCDD ) )
> Telecom Manager ( (
> LH Morris Electric, Inc. ) )
> (541) 265-8067 office _|****| mmm!
> (541) 265-7652 fax ( | | coffee!
> (541) 270-5886 cellular \| |
> [EMAIL PROTECTED] |____|
>
>
> Yahoo! Groups Links
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>
>
>
--
73...Clark Beckman N8PZD
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