Preliminary sizing for an atmospheric storage tank: API 650 1-foot-method shell thickness (design and hydrotest, governing value) and API 2000 liquid-movement venting — out-breathing on filling and in-breathing on emptying (x2 for volatile liquids).
Inputs
| Parameter | Notes |
|---|---|
| Diameter D, liquid height H (m) | Tank geometry |
| Specific gravity | Stored liquid |
| Design/test stress, joint eff. | Material allowables |
| Corrosion allowance (mm) | Added to thickness |
| Fill / empty rate (m3/h) | Liquid-movement venting |
Outputs
| Output | Basis |
|---|---|
| Shell thickness (mm) | Design & hydrotest, governing |
| Out-breathing (Nm3/h) | On filling |
| In-breathing (Nm3/h) | On emptying |
Standards & Method
Shell thickness by the API 650 1-foot method; liquid-movement venting per API 2000. Thermal in/out-breathing must be added per API 2000 section A.4 latitude/insulation tables.
Open the Storage Tank Venting & Shell Calculator →
Screening-level preliminary calculation. Verify against project standards and vendor data before engineering use.