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# Vessel standard diameter

## Vessel standard diameter

(OP)
Regarding pressure vessels standard diameters, are vessels commonly fabricated with standard increments? If so, which is this increment?

### RE: Vessel standard diameter

SergioNeves,
Please explain what you mean by standard increments, Vessels are measured in Feet and inches Or metres and centimtres depending on where in the world you live. some how I do not think that this is what you are after.
B.E.

You are judged not by what you know, but by what you can do.

### RE: Vessel standard diameter

I think he is asking if vessels are manufactured in common sizes similar to piping. i.e. piping has 1", 2", 4", etc nominal sizing. As such, I think the question is are vessels fabricated in "common" or "standard" sizes i.e. 24", 36", 72", etc.

In my experience, no, most pressure vessels are designed with operational criteria. Going too large or too small could have significant process flow or batch sizing impacts and so each pressure vessel is typically purpose made.

### RE: Vessel standard diameter

(OP)
Thanks for all kind explanations and aswers.
Indeed what I mean is that according to some engineering procedures, e.g. Lummus criteria, when I calculate a vessel diameter I should approximate it do the next 6 inch. For instance, if I calculate 27,3 in I shoud use 30 in. I do not know why Lummus recommends this. Is this a requirement of vessels manufacturer to optimize construction?

### RE: Vessel standard diameter

This sounds like something a vessel manufacturer would do, to encourage people to buy the sizes he has in stock. Sometimes near enough is good enough , sometimes it is not.
B.E.

You are judged not by what you know, but by what you can do.

### RE: Vessel standard diameter

I think the most informative facts are incorporated in the different standards for pressurized vessels. Se comparison in the link above.

If you look at the practical fabrication of vessels they could, depending of size, pressure and material requirements, either be formed(partly) from prefabricated (metal) tube, or from plates rolled to curved form.

If the vessel is possible (and cheaper) to be formed from standard piping, it would be sensible to adapt the vessel to a standard piping diameter. If the vessel has to be formed from rolled plate, other fabricating questions must also be evaluated in the cost calculation.

PS: More modern materials (glass fibre, carbon fibre) makes it technically possible to divert from standard form, but the different calculation standards seems to be lacking guidelines in this respect (?).

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