Talk:Barlow's formula

Stub

This page has been tagged as a stub. This may be wrong, as there appears not to be much more to be said about a topic as simple as this one is. The formula rates its own article but does not have the potential depth that encourages further elucidation. If anyone believes otherwise, perhaps the argument could be made? --Coosbane (talk) 17:38, 9 February 2009 (UTC)[reply]

Some ideas for expansion: history, applications, actual experience, alternatives to this formula, derivation (fundamentals or empirical), approximations, limits of applicability, genealogy (was it descended from another formula?; is it a parent of something further?), etc. Also, how would/does it apply to non-spherical and non-tubular containers? —EncMstr (talk) 09:00, 10 February 2009 (UTC)[reply]

Good ideas, all of those. They would require contribution from a qualified and experienced pressure vessel engineer, which I am not. My background is in the design of autoclaves using pressure vessels supplied by others. The vessel accounts for, often, less than half, sometimes as little as a third, of the cost of manufacturing the autoclave, although there are exceptions to this generalization. --Coosbane (talk) 15:37, 10 February 2009 (UTC)[reply]

How is the Barlow's formula the same as Kesselformel, when the diameter is external in the former while mean in the latter? I have not been able to find reliable source for origin and exact form of the formula, but there is a lot of online Barlow's formula calculators that use the external diameter and this form is still used in some standards for natural gas transportation pipelines such as e-CFR (US) and EN 1594 (EU). Tomáš Létal (talk) 07:55, 16 November 2020 (UTC)[reply]

It's the same equation. While the middle diameter is mathematically correct as per the derivation, choosing the outer diameter reduces the allowable pressure, and is thus a conservative estimate. 157.19.151.232 (talk) 04:30, 20 October 2021 (UTC)[reply]

It is definitely not the same equation. When you design pressure vessel or piping according to standards EN 13445 and EN 13480, you have to use Kesselformel. On the other hand, for natural gas piping according to EN 1594, you have to use Barlow's formula. Diference for thick piping can be almost 26 % (for De/Di=1.7, which is upper limit in EN 13480 for use of Kesselformel).Tomáš Létal (talk) 08:21, 26 November 2021 (UTC)[reply]