SDR-7 Dimensions
SDR-7 Dimensions
(OP)
I'm working on my first project where I actually have to know something about SDR-7 poly pipe and information seems to be a bit sketchy. I'm trying to model a complex gathering system that is almost all SDR-7 and I haven't been able to determine the ID of the pipe.
I've found the formula's for wall thickness required to meet the pressure-containing capacity of SDR-7, but it assumes you know an SMYS of the brand you're looking at. I haven't been able to find any SMYS data.
Does anyone have a link that would allow someone to determine inside diameter (or a table of a specific manufacturer's pipe dimensions)?
I've found the formula's for wall thickness required to meet the pressure-containing capacity of SDR-7, but it assumes you know an SMYS of the brand you're looking at. I haven't been able to find any SMYS data.
Does anyone have a link that would allow someone to determine inside diameter (or a table of a specific manufacturer's pipe dimensions)?
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
The harder I work, the luckier I seem





RE: SDR-7 Dimensions
Download NPS for Windows v2.2 from the following webpage.
http://www.herne.com/down.htm
Also, the following webpage has much info on plastic pipe and fittings. I recommend ordering Performance Pipe (Plexcalc) CD-ROM (it's free), the engineering manual is very good.
http://www.herne.com/down.htm
RE: SDR-7 Dimensions
http:
RE: SDR-7 Dimensions
There is table of pipe dimensions for HDPE by KWH Pipe,
www.kwhgroup.com/_FileRoot/322114.pdf
on page 3.
RE: SDR-7 Dimensions
More tables for HDPE pipe dimensions,
www.isco-pipe.com/pdf/ips.pdf
www.isco-pipe.com/pdf/dips.pdf
RE: SDR-7 Dimensions
h
The long answer: SDR (Standard Dimensional Ratio) defines the nominal pipe wall thickness as a ratio to the "exact" pipe outside diameter. For example, a 4" IPS polyethylene pipe has an outside diameter of 4.500". For SDR 7, the wall thickness is 4.500 / 7 = 0.643".
In this example, the shortcut to calculate the inside diameter is to multiply the outside diameter (4.500") by (5/7) = 3.21".
This works for any IPS Polyethylene Pipe & any SDR (if using SDR 21, multiply the OD by 19/21 to obtain the ID).
www.SlideRuleEra.net
RE: SDR-7 Dimensions
www.SlideRuleEra.net
RE: SDR-7 Dimensions
It's that simple?? I've dug through several hundred pages of murky nonsense and nothing I looked at came close to explaining it in a way that I could actually use to calculate an ID. I'm using the AGA equation in a pipeline model and in the calibration step I'll see if the weld bead is giving me any permanant reduction in efficency.
Everyone else,
Thanks for the links, there was a bunch of good information (not ID for the Imperial pipe dimensions I'm looking at, but a lot of really good information).
David
RE: SDR-7 Dimensions
http://w
If you are using any mitered fittings (especially Tees) be sure to take into consideration that they are MUCH weaker (withstand less internal pressure) than the pipe itself.
Please let us know the results your investigation of internal fusing bead effects.
Best Wishes
www.SlideRuleEra.net