I was told that tubes are for structure, that is they are made to be
strong structurally. Pipes are for transfer of liquids are are built to
be able to contain whatever you pass trough them. You can use pipes for
construction but have to take necessary precautions not to run into
problems. I am, for example, that irrigation pipes are very good for
tall masts.
73 de Hans - N2JFS
-----Original Message-----
From: Pete Smith <n4zr@contesting.com>
To: Hank Lonberg <kr7x1@verizon.net>
Cc: TowerTalk@contesting.com
Sent: Tue, Nov 3, 2009 6:15 am
Subject: Re: [TowerTalk] Stainless Steel Mast
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
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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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