Re: [AFMUG] Black pipe

Sat, 17 Oct 2020 10:22:03 -0700

Get a lot of pipe from a local fence supply. They do OD up to 6" and 28' long and cut to order. All galvanized, and I usually just treat the ends with some zinc chromate.


bp
<part15sbs{at}gmail{dot}com>
On 10/17/2020 8:59 AM, Ken Hohhof wrote:

I have used 3 inch (trade size) IMC electrical conduit.  It is lighter than 3” rigid and probably stiffer because of work hardening of the steel in the forming process.

 

You could also use 3 inch rigid conduit.  You probably don’t want to get aluminum though, it’s got more flex.

 

If you’re willing to pay for shipping, most of the usual distributors of tower steel sell galvanized pipe for mounting antennas.  The advantage perhaps being I think the ends are galvanized.  I’ve never seen the cut ends rusting to cause problems, maybe after 50 years it would.

 

Are you sure 2” pipe or 2-3/8 galvanized fence post wouldn’t be good enough?

 

If you just need short pieces, you could check with local plumbers and electricians to see if they have some leftover cut off pieces.

 

 

From: AF <[email protected]> On Behalf Of Steve Jones
Sent: Saturday, October 17, 2020 10:22 AM
To: AnimalFarm Microwave Users Group <[email protected]>
Subject: Re: [AFMUG] Black pipe

 

I can get some 3 inch emt probably, not sure the OD on that, I need 3.5 for some 3' antennas. Would that be rigid enough for that torque? And what is it made of that it doesnt rust, its steel

 

On Sat, Oct 17, 2020, 9:54 AM <[email protected]> wrote:

It will rust.  Not quickly unless you are by the coast.  Problem is, it has a coating that is difficult to remove.  Sandblasting is what I use if I have to use it.  You cannot galvanize it unless you remove the coating down to bare metal.  Not sure if it will take paint.  Probably if you degrease it pretty well. 

 

From: Steve Jones

Sent: Saturday, October 17, 2020 8:40 AM

To: AnimalFarm Microwave Users Group

Subject: [AFMUG] Black pipe

 

We normally get galvanized water pipe for masts, but the local shop doesnt have any 3 inch in stock..they have 3 inch black pipe though. Has anybody used black pipe as a mast before? I'm concerned it will rust out relatively quickly

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