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Posted: 9/7/2010 3:18:12 PM EDT
Does anyone know of a source of Schedule 80 3.5 inch pipe? I am putting up a flagpole and am going to insulate it so I can make it radiate a bit. I have searched locally and online and cannot find any. Any help is appreciated.
Link Posted: 9/7/2010 4:26:04 PM EDT

How about dropping it into a length of 4" pipe with a cemented cap on it and then filling the void with some spacers and some quikcrete?
Link Posted: 9/7/2010 4:36:15 PM EDT
Shape Pipe
Pipe Type Unthreaded
Pipe to Pipe Connection Unthreaded (pipe)
System of Measurement Inch
Schedule 80
Pipe/Thread Size 4"
Inside Diameter 3.786"
Outside Diameter 4.5"
Perforation Type Solid Pipe
Material PVC
Color Dark Gray
Maximum Pressure Range 251 to 500 psi
Maximum Pressure (251 to 500 psi) 320 psi
Temperature Range Up to 140° F
Specifications Met American Society for Testing and Materials (ASTM) and National Sanitation Foundation (NSF)
ASTM Specification ASTM D1784 and ASTM D1785
NSF Specification NSF 61

Link Posted: 9/7/2010 5:25:27 PM EDT
The issue is that the pipe is 3.251 od. The Id of 3.5 sch 80 is 3.321 which would be perfect. I am thinking that it is not common much less made at all anymore.
Link Posted: 9/7/2010 8:07:49 PM EDT
If you can't find the sch 80, you might consider using some plastic dielectric rods to take up the space and foam or epoxy them in place.

Probably have less capacitance too.
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