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Re: [TowerTalk] Rigid Steel Conduit as Mast?

To: "'Tower Talk List'" <>
Subject: Re: [TowerTalk] Rigid Steel Conduit as Mast?
From: "Mike" <>
Date: Fri, 5 Jun 2009 16:46:29 -0700
List-post: <">>

I would use the Mast Material described in the price list above, I could
never find it locally.  I decided to use this stuff so that I could sleep at
night.  You can actually climb the heavy duty 20 feet of this stuff and work
on you antennas.  Not cheap though, but when you consider the money you
spend putting a tower up well worth it.


-----Original Message-----

So, for those of us who are in the process of tower-planning, what 
should we order from the local "metals supermarket" type of supplier to 
use for a 20 ft. mast to hold an HF tribander and a 6m beam?

(Calculated wind load is 6 ft^2 for the tribander and 3 ft^2 for the 6m 
for 9 ft^2 total wind load from the antennas ONLY.)

DeKalb County, Georgia is a 90mph county and I've specced everything out 
so far to 110mph ratings for the tower.

I've found seamless steel tubing, 1/8" walls, non-galvanized, but am 
concerned with how to protect the interior from corrosion if it's not 
hot-dip galvanized?  I can "cold-galvanize" the outside, but the 
interior is a different matter.

Jim Brown wrote:
> On Fri, 05 Jun 2009 18:52:50 -0400, Roger (K8RI) wrote:
>> There are two types of rigid steel conduit. The one is like schedule 40 
>> pipe and the other (EMT) is thin wall.
> Clarification: Actually, there are three thicknesses of steel conduit 
> commonly used in North America. In the trade, they are designated "Rigid 
> Steel Conduit," "Intermediate Metal Conduit," and Electrical Metallic 
> Tubing.  Wall thicknesses varies with conduit size, and for these 1.5-inch

> nominal conduits are are 0.138 in, 0.09 in, and 0.065 in respectively. I'm

> talking about using a 10 ft length of "Rigid Steel Conduit," which is 1.9 
> inch o.d., with only a 3-el SteppIR at the top (which is relatively small 
> and light weight). 
> 73,
> Jim K9YC
73 de W5NNH
10X 75371/M&M 117/SMIRK 6185/Six Club 285/TRA 2499/Norcross 228 F&AM

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