Meaning of H.O.S. in pressure vessel dimension 1

[Ron Parel]

Hi to All, hoping everyone is doing fine.

I would like to know the meaning of H.O.S. (height on straight) in pressure vessel dimensioning please.

Thank you Sirs!

 

[racookpe1978]

Scan the dwg (document) then post it, that has this abbreviation please. The reason you are asking the question, since you apparently have the term already) is not yet clear.

 

[marty007]

I'm used to seeing it referred to as Height of Steel, as an elevation reference.

 

[JStephen]

Height outside, height of overall shell?