Nominal diameter
Nominal diameter
(OP)
Very daft question but this is driving me nuts.
The nominal diameter as I was aware is the estimate internal diameter of a pipe. But I seem to be seeing references to DN being the outside diameter.
What is correct. (european standard)
(materials - cast iron and PVC (normally given as internal and external diameters respectively)
The nominal diameter as I was aware is the estimate internal diameter of a pipe. But I seem to be seeing references to DN being the outside diameter.
What is correct. (european standard)
(materials - cast iron and PVC (normally given as internal and external diameters respectively)
Cheers. Sean.





RE: Nominal diameter
Examples,
12" "Nominal" pipe is 12.75 OD, but 18" NOMINAL pipe is 18" OD.
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RE: Nominal diameter
If you know either both or one of the actual diameters why would you care what the nominal diameter is ? Whatever the practice is in your part of the world you can learn it but it won't help you a great deal to know that.
good luck
RE: Nominal diameter
It seems that the DN isn't so useful. I want to specify a drainage pipe of something like 300mm. There are two major pipe producers in Norway, Wavin and Pipelife. Wavin does 300mm and Pipelife 315mm with IDs 255 and 276. How does one specify for a pipe using DN. The only way for me would be based on a minimum ID of 255 - bore, making DN redundant.
Is this a local problem in Norway (i.e. do your markets have better conformity regs.)
Cheers. Sean.
RE: Nominal diameter
good luck
RE: Nominal diameter
ALWAYS specify the OD and the Wall Thickness (WT).
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RE: Nominal diameter
One thing that you can keep in mind is that for pipes (as opposed to tubes) the outside diameter is constant for a given standard and the wall thickness, and therefore the ID, varies with the pressure rating.
In the US context it makes a bit more sense. The ANSI sizes are based on the old IPS (Iron Pipe Size) standard and the Nominal Diameter is roughly the ID for sizes up to 12" for the "Extra Strong" wall thickness. For sizes 14" and above the Nominal Diameter is the OD in the ANSI system.
Katmar Software
Engineering & Risk Analysis Software
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RE: Nominal diameter
http://virtualpipeline.spaces.msn.com
RE: Nominal diameter
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Nominal diameter
http://virtualpipeline.spaces.msn.com
RE: Nominal diameter
4'8 1/2" - guess you are referring to British standard railway gauge - at least you don't forget it, well I haven't - probably first heard it a good 50 years back in primary school.
RE: Nominal diameter
http://virtualpipeline.spaces.msn.com
RE: Nominal diameter
RE: Nominal diameter
As for the shuttle, it seems that the booster rockets travel by rail to assembly point and consequently their diameter is (somehow) limited by the width of the US railway gage, which was handed down through the Roman-Brits heritage. I'll have to measure the Spanish rail gage. I don't know what it is.
Sean. Appologies for the hijack. I'm finished.
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RE: Nominal diameter
RE: Nominal diameter
RE: Nominal diameter
RE: Nominal diameter
These web pages seem to disagree with your ID theory.
http://
http:/
[quote]This Tutorial considers Schedule 40 pipework as covered in BS 1600.
Tables of schedule numbers can be obtained from BS 1600 which are used as a reference for the nominal pipe size and wall thickness in millimetres. Table 10.2.1 compares the actual bore sizes of different sized pipes, for different schedule numbers.
In mainland Europe, pipe is manufactured to DIN standards, and DIN 2448 pipe is included in Table 10.2.1.
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