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Guest Message by DevFuse

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Need a 12' 2" pipe to mount slimline dish


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49 replies to this topic

#1 OFFLINE   captgadget

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Posted 26 January 2014 - 01:58 PM

Wondering if anyone has any suggestions what type of pipe and where I might acquire such a thing.



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#2 OFFLINE   Bill Broderick

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Posted 26 January 2014 - 02:49 PM

A muffler shop.



#3 OFFLINE   scr

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Posted 26 January 2014 - 03:01 PM

How do you intend to support it?



#4 OFFLINE   Drucifer

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Posted 26 January 2014 - 03:26 PM

Wondering if anyone has any suggestions what type of pipe and where I might acquire such a thing.

 

Well, where are you? A general area will do.


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#5 OFFLINE   RBA

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Posted 26 January 2014 - 03:39 PM

Fencing companies and muffler shops are the most common suggestions.



#6 OFFLINE   MysteryMan

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Posted 26 January 2014 - 03:40 PM

www.metalsdepot.com


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#7 ONLINE   Nick

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Posted 26 January 2014 - 07:05 PM

I got mine at Home Depot - they have everything.


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#8 OFFLINE   Davenlr

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Posted 26 January 2014 - 07:47 PM

I got mine at Home Depot - they have everything.

 

You happen to have the SKU?  Im planning on relocating my dish, since the gas meter reader keeps knocking into it and causing a 771 until I get home to reaim it.  I want to put it in the back yard, but totally forgot what size pipe to get.


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#9 OFFLINE   dennisj00

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Posted 26 January 2014 - 08:00 PM

2 inch OD.  I'm buying one tomorrow.



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#10 OFFLINE   Getteau

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Posted 27 January 2014 - 08:05 AM

Like others have said, muffler shop.  I stopped in a Mieneke shop and while they told me they didn't have it, they pointed me to a mom and pop shop just down the street.  It was $8 for an 8' piece.


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#11 OFFLINE   davring

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Posted 27 January 2014 - 08:32 AM

There are vast differences in the quality of exhaust tubing. Most is thin wall, made for bending. Walker exhaust makes an Aluminized 2" OD .082 thick, very strong and resists rusting, well worth the extra few bucks. It is available at NAPA or any auto parts jobber that sells Walker brand exhaust.
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#12 OFFLINE   Mike Bertelson

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Posted 27 January 2014 - 12:00 PM

I wouldn’t use a muffler pipe for a 12 foot long dish mount.  It can't handle the wind loads.

 

If we assume the previously mentioned 2in OD and wall of t=0.082, at a length of 12 feet you get a maximum of 47.4 lbs of load to yield the base of the pipe (using 30,000 psi yield strength of mild steel).  That’s not a lot of load.  For a pipe it takes somewhat less than 55ish lbs of load at the top to become fully plastic at the base...to bend and not spring back all the way  Nearly every adult can push that much load into that pipe. 

 

Tubing that thin at that length is very, very flexible.  It won’t take much wind load to cause it to twist and it wouldn’t take much to cause reception issues.  I’ll bet you’ll get more 771 errors than you’re willing to deal with.

 

BTW, I’m a pipe stress analyst.  This is what I do for a living.  Trust me when I say 12 feet of pipe is a long way to go and you’d need something with a bigger wall thickness to handle such a long moment arm.  It would need to be even bigger still to not twist in the wind.  The dish has a pretty good sized surface area and it won’t take much wind to get it twisting back and forth.  I’d have to run a couple of what if scenarios to determine the right wall thickness so it won’t twist enough to cause 771 errors.  However, at 12 feet long, it’s very, very flexible in torsion so I suspect it would start to get cost prohibitive.

 

BTW, if you do get a hunk of pipe make sure it’s ASTM A513 tubing and not 2” NPS.  A513 tubing has an OD of 2 inches where 2 in NPS pipe has an OD of 2.375”.  If you just ask for 2 inch pipe you might get the wrong stuff.  Make sure it conforms to the A513 specs (pipe would be ANSI B36.10). 

 

Personally, I'd use square tube for the majority of the height and then use the standard Slimline mount on a plate at the top...which wouldn't be cheap. :grin:

 

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#13 OFFLINE   Bill Broderick

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Posted 27 January 2014 - 03:31 PM

I wouldn’t use a muffler pipe for a 12 foot long dish mount.  It can't handle the wind loads.

 

 

I agree.  I misread the thread title and though that the OP was looking for a 12 inch pipe, not a 12 foot one.



#14 OFFLINE   davring

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Posted 27 January 2014 - 05:20 PM

I wouldn’t use a muffler pipe for a 12 foot long dish mount.  It can't handle the wind loads.

I wouldn't mount a dish on a 12 foot piece of tubing of any kind without some sort of support. I've had good luck with the product I mentioned for three different ground installations which are now several years old and very little rusting. Just wanted folks to know of the ease of finding the pipe, most stores will cut to length.


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#15 OFFLINE   studechip

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Posted 28 January 2014 - 05:50 PM

My Slimline is on a 12' fence post buried 3 ft in the ground. It has no support other than three bags of Quikrete. I installed it almost 8 years ago and have had no issues with it, YET! I did have to use flashing to increase the diameter since it was a bit under 2".


Edited by studechip, 28 January 2014 - 05:50 PM.


#16 OFFLINE   Cyber36

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Posted 29 January 2014 - 08:04 AM

Schedule 40 black pipe should suffice quite nicely. Just be sure to cap off the top end.



#17 OFFLINE   jimmie57

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Posted 29 January 2014 - 08:26 AM

My Slimline is on a 12' fence post buried 3 ft in the ground. It has no support other than three bags of Quikrete. I installed it almost 8 years ago and have had no issues with it, YET! I did have to use flashing to increase the diameter since it was a bit under 2".

1-1/2" pipe is actually 1-15/16" outside diameter.

2" pipe is actually 2-3/8" outside diameter.

To get something 2" outside diameter you need to buy Tubing. Tubing is measured by the outside diameter and then the wall thickness which is sometimes referred to as example, 2" OD x 16 gage.


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#18 OFFLINE   captgadget

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Posted 29 January 2014 - 08:44 AM

Gosh, so many great ideas here. I'm living in a park model in the Rio Grande Valley. This installation will be along side of a new awning. The park manager will drill a hole in the concrete so I can put the pipe in the ground. Then I'm hoping I can anchor to the awning supports. There is plenty of wind here so I hope it with stands it ok. I'm so limited because of trees. Directv will not mount on the roof of the park model, but I'm not sure why I can't do it. It's a metal roof over asphalt shingles but I'm not sure what type of underlayment there is under the shingles.

 

Thanks for all the great input.



#19 OFFLINE   studechip

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Posted 29 January 2014 - 10:12 AM

My Slimline is on a 12' fence post buried 3 ft in the ground. It has no support other than three bags of Quikrete. I installed it almost 8 years ago and have had no issues with it, YET! I did have to use flashing to increase the diameter since it was a bit under 2".

 

 

1-1/2" pipe is actually 1-15/16" outside diameter.

2" pipe is actually 2-3/8" outside diameter.

To get something 2" outside diameter you need to buy Tubing. Tubing is measured by the outside diameter and then the wall thickness which is sometimes referred to as example, 2" OD x 16 gage.

As I said, I used fence post, which is actually just under 2", perhaps 1 15/16". That's why I had to use the flashing. The fence company called it 2", not 1 1/2".



#20 OFFLINE   jdspencer

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Posted 29 January 2014 - 10:38 AM

With a dish mounted that high, how do you align it?


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