Re: 1/4" copper tubing?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: FIFTYGUY@xxxxxxx 

In a message dated 3/30/07 12:45:13 A.M. Eastern Standard Time, 
tesla@xxxxxxxxxx writes:
>>     If by "standard" pipe, you mean iron, brass, and PVC pipe, then
>> standard pipe is measured by the *outside* diameter, not the
>>inside diameter.
>>     Yes, this means the flow characteristics change as the wall
>> thickness ("schedule") changes.
>
>Phil -
>
>Sorry, but this is completely wrong.

    I think it's just a case of miscommunication now. I can see 
where what I wrote might actually further confuse things:

>Spend five minutes in the plumbing department of any hardware store
>and you'll see what I mean.
>
>Or, check any standard reference for mechanical engineering data,
>like Machinery's Handbook.

    LOL, I work with pipe all the time in my day job, we're on the 
same page. :)

>Here are the nominal ("designated") pipe sizes for metal pipe
>(doesn't matter if its steel, brass, aluminum, stainless steel, etc),
>and the actual outside diameter:
>
>Pipe size        OD
>1/8"            .405"
>1/4"            .540"
>3/8"            .675"
>1/2"            .840
>Etc, etc.
>
>So, you can see that 1/8" pipe does not have an OD of 1/8".

    I didn't say that it did. :)
    But I can see why it could have confused the issue instead of 
clarifying it.
    What I should have said is "standard pipe is *designated* by the 
outside diameter". I was trying to point out that within the same 
standard pipe size, the OD remains the same for all pipes, while the 
ID changes as the thickness changes. I was trying to correct this 
point from the preceding post.
    As you have shown, the OD is of course nowhere near the 
"nominal" size. But neither is the ID, except for extremely thick pipe!

-Phil LaBudde






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