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Elwobs (DIN 2605)
- Thread starter Hrki
- Start date
- Replies 14
- Views 18,337
TeachMePlease
Diamond
- Joined
- Feb 11, 2014
- Location
- FL
Radius (of bend) = 1.5 the Diameter of tubing?
I'm only guessing, but it makes sense...
I'm only guessing, but it makes sense...
Limy Sami
Diamond
- Joined
- Jan 7, 2007
- Location
- Norfolk, UK
D = d or the tube OD.
Limy Sami
Diamond
- Joined
- Jan 7, 2007
- Location
- Norfolk, UK
Good point? you got me there , sorry about that.
JRIowa
Diamond
- Joined
- May 27, 2003
- Location
- Marshalltown, Iowa, USA
2*A = 229
229-88.9=140.1
140.1/1.5=93.4 which is as close as you're probably going to get with bent tube At least it's within their tolerance.
Now, I've got a terrible cold and I'm on medication that warns me from running equipment. So, I could be wrong.
JR
229-88.9=140.1
140.1/1.5=93.4 which is as close as you're probably going to get with bent tube At least it's within their tolerance.
Now, I've got a terrible cold and I'm on medication that warns me from running equipment. So, I could be wrong.
JR
Nick Mueller
Titanium
- Joined
- Jun 12, 2006
- Location
- Munich / Germany
That drawing and that table is a bit messed up I think.
Usually, "D" is the outer diameter and "d" the inner diameter.
Now if you calculate the inner diameter, things make sense:
d = 16 (20 - 2 * 2) -> R = 16 -> a = 16 and h = 26 (16 + D/2)
But then, I thought the bending radius is relative to the OD, thus the R = 1 * D and not R = 1 * d.
But I don't have the standard here ...
Nick
PS: Did you mean "elbow"? I just wanted to learn what elwob is
Usually, "D" is the outer diameter and "d" the inner diameter.
Now if you calculate the inner diameter, things make sense:
d = 16 (20 - 2 * 2) -> R = 16 -> a = 16 and h = 26 (16 + D/2)
But then, I thought the bending radius is relative to the OD, thus the R = 1 * D and not R = 1 * d.
But I don't have the standard here ...
Nick
PS: Did you mean "elbow"? I just wanted to learn what elwob is
RayG
Hot Rolled
- Joined
- Feb 21, 2012
- Location
- Victoria, Australia
Elwobs.... Croatian for messed up Elbows? or zabrljao laktovi
sfriedberg
Diamond
- Joined
- Oct 14, 2010
- Location
- Oregon, USA
You have to keep in mind that 1) these designed radii (1.5D, 2D, etc) are nominal, and 2) there are some pretty big tolerances in pipe bending. The table is telling you what actual dimensions the supplier will make those bends.
In the column labeled 'h', the value 159mm. That's the actual dimension they will supply, in contrast to the nominal dimension of 133.35mm.
MetalCarnage
Stainless
- Joined
- Apr 24, 2011
- Location
- Nebraska
I really like the term "elwobs" and think I will add it to my lexicon. It SHOULD be a word!
-Ron
sfriedberg
Diamond
- Joined
- Oct 14, 2010
- Location
- Oregon, USA
"r" in that chart corresponds to "a" in the original chart, or the neutral line of the bend. The next column to the right corresponds to "h" in the original chart, or the outside radius of the bend.
If you look at the numbers: 114 and 159, you will see they are (essentially) the same in both charts for the case of 1.5D and 88.9mm.
So I don't understand WTF you are WTF-ing about.
Nick Mueller
Titanium
- Joined
- Jun 12, 2006
- Location
- Munich / Germany
I tried to figure out why the values make so little sense.
One point that makes sense now is: The elwobs[tm] are dimensioned by the ID. Like all the tubing as you need the inner diameter to properly adjust for flow etc.
These tubes and elbows are sold and dimensioned by "DN", the nominal diameter that happens to be the inner diameter. Second parameter is wall thickness to fit the pressure.
And now, if you use the DN (or ID), the values make more sense. Why they are still off, is above my head. Tolerances can't be the reason. Maybe it has to do with the fact that they came from inch-sized tubes.
Nick
One point that makes sense now is: The elwobs[tm] are dimensioned by the ID. Like all the tubing as you need the inner diameter to properly adjust for flow etc.
These tubes and elbows are sold and dimensioned by "DN", the nominal diameter that happens to be the inner diameter. Second parameter is wall thickness to fit the pressure.
And now, if you use the DN (or ID), the values make more sense. Why they are still off, is above my head. Tolerances can't be the reason. Maybe it has to do with the fact that they came from inch-sized tubes.
Nick
