Forgot to click replay to all.
Ok hopefully this helps vs more confusion.
The difference between pipe and tube is simply in the way it is sized
Pipe and is measured on the inside. Tube and is measured on the outside. So
if your looking for a mask that is 2" you will be looking for tubing.
Anything can be bent with the right equipment, both pipe and tubing. Were are
not working with soft copper tubing and hard copper pipe.
For a antenna mast on a tower they recommend a steel of 1026 this is what is
commonly known as DOM tubing. This tubing a lot tougher then other types of
tubing and its reworked by being drawn over a mandrel
For steel tubing there is HREW, CREW, DOM
Hot Rolled Electric Welded
Cold Rolled Electric Welded
Drawn Over Mandrel
People have used anything and everything base on whats available to them for
free :-o
"Hank, you didn't address the pipe vs tubing issue. Is pipe with a seam
inherently much weaker than seamless tubing of the same material and
wall thickness?"
Not to answer for Hank, but the short answer is Yes. I would not use pipe were
weight, strength and saftey are a major factor. But I use pipe for things it
was not intended for and it works just fine.
For those with a broad band connection
http://www.youtube.com/watch?v=i3hXiujkqoI
Craig
--- On Tue, 11/3/09, Pete Smith <n4zr@contesting.com> wrote:
From: Pete Smith <n4zr@contesting.com>
Subject: Re: [TowerTalk] Stainless Steel Mast
To: "Hank Lonberg" <kr7x1@verizon.net>
Cc: TowerTalk@contesting.com
Date: Tuesday, November 3, 2009, 3:15 AM
Hank, you didn't address the pipe vs tubing issue. Is pipe with a seam
inherently much weaker than seamless tubing of the same material and
wall thickness?
73, Pete N4ZR
New Articles Daily - the Contesting Compendium at http://wiki.contesting.com
The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net
On 11/2/2009 8:34 PM, Hank Lonberg wrote:
> Dave:
>
> The important number is the yield stress not the tensile
> stress. 6061-T6 and the stainless, most likely 304 or even
> 316, have about the same yield of 36,000 psi plus or minus.
> This is the threshold stress where the behavior of the
> material changes from elastic to plastic. This mean if want
> the material to rebound to initial position after loading you
> need to keep the max stress below yield. In the case of your
> masting material they will both support about the same load
> with equal stresses.
>
> The kicker is the Modulus of Elasticity,E, which for the
> stainless, like other steels, is around 29,000,000 psi. The E
> for aluminum is around 10,000,000 psi. This means for the same
> section dimensions and load the aluminum will deflect 3 time
> more than the steel. My money for durability is on the
> stainless.
>
> Regards
> Lonberg Design Group, Ltd.
> H.S. Lonberg, P.E.,S.E.
> President
>
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Pete
> Smith
> Sent: Monday, November 02, 2009 1:30 PM
> Cc: 'David Jordan'; TowerTalk@contesting.com
> Subject: Re: [TowerTalk] Stainless Steel Mast
>
> BUT, if it's pipe, it may not be seamless
>
> 73, Pete N4ZR
> New Articles Daily - the Contesting Compendium at
> http://wiki.contesting.com
> The World Contest Station Database, updated daily at
> www.conteststations.com
> The Reverse Beacon Network at http://reversebeacon.net
>
>
> On 11/2/2009 3:34 PM, Rex Lint wrote:
>
>> Dave,
>>
>> 6061-T6 has Tensile strength of 42K PSI and yeild at 35K PSI
>>
> - See
>
>> wikipedia.
>> Stainless varies from about 75K to 190K PSI Tensile,
>>
> depending on the
>
>> allooy. See http://www.onlinemetals.com/stainlessguide.cfm
>>
>> -Rex-
>>
>> K1HI
>> Rex Lint
>> Merrimack, NH
>>
>> -----Original Message-----
>> From: towertalk-bounces@contesting.com
>> [mailto:towertalk-bounces@contesting.com] On Behalf Of David
>>
> Jordan
>
>> Sent: Monday, November 02, 2009 2:10 PM
>> To: TowerTalk@contesting.com
>> Subject: [TowerTalk] Stainless Steel Mast
>>
>> Hi Folks,
>>
>>
>>
>> I found a nice length of stainless steel pipe 2" OD (.250"
>>
> wall) by 10ft
>
>> that I thought might make a nice mast stub. How would this
>>
> tubing's
>
>> strength compare to 6061 aluminum of similar dimensions?
>>
>>
>>
>> Thanks,
>>
>> Dave
>>
>> Wa3gin
>>
>>
>>
>>
>>
>> _______________________________________________
>>
>>
>>
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>>
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>>
>>
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