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Forum Index : Windmills : Pipe size
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imsmooth Senior Member  Joined: 07/02/2008 Location: United StatesPosts: 214 |
This may seem like a dumb question, but when you all refer to pipe sizes for the tower, like a 3.5" diameter pipe, are you referring to the outside or inside diameter? I ask because when I went to get some pieces at the store pipes are categorized here based on internal diameter. I am guessing everyone is referring to outside diameter, right? |
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Bolty Regular Member  Joined: 03/04/2008 Location: AustraliaPosts: 81 |
I am no expert, but I think it depends on whether it is pipe or tubing. Pipe is often assumed to carry internal contents and is usually (but not always) rated on ID. Contradictions to that are PVC and poly pipes, of which one is rated ID and the other OD. However I do think that most metal pipes are rated as ID. Tubing however is usually rated on OD, as it is usually being used as a strutural item, and it is not used to pass fluids through it's centre. To avoid any confusion, I usually ask the supplier whether it is ID or OD! Cheers! Bolty |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5116 |
This page has some common steel sizes... http://www.thebackshed.com/windmill/Docs/CommonSteelSections .asp The sizes show on that page are metric, from an Australian source. As well as wall thickness measured in mm, we use the terms Extra-light, Light, Medium, Heavy and Extra-heavy, which are fractions of the overall diameter. ie a 80mm pipe, Extra-light has a wall of 2.6mm, Extra-heavy is 5.9mm. I think the USA uses a different system for sizing the wall thickness of pipe. Like Bolty said, it depends on the application. I always quote ID and OD when ordering pipe, just to be on the safe side. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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