Below we show the summary of the Load Cases Calculations for Welded tanks. You will find more information on the calculations in the following articles.
Load Case 1 | Load Case 2 | Load Case 3 | |
|---|---|---|---|
Description | Shell calculated wall thickness | Buckling Calculation (wind) | Roof Pressure (on the Shell) |
Objective | Calculate the RL based on corrosion | Calculate the number of Wind Girders needed for the Course and the RL | Calculate the impact on RL of Roof pressure on the tank Shell. |
General RBI Specs **General Component Data *EQUIP SPECIFICATIONS **COMPONENT SPECS Other specifications might be required, depending on material, DM, Component | Compliance Code (e.g. DEP, API) Pitting (checked=yes) Joint Efficiency Factor** (if not specified, default derived from SRBI-SHELL JOINT TYPE*) Thickness as built** For Courses: Course Height** SRBI-DIAMETER* SPEC GRAVITY @ OP TEMP* DESIGN PRESS* For Roof and Floor: RENEWAL THICKNESS** | Compliance Code SRBI-MAX OPERATING TEMPERATURE* SRBI-WINDSPEED* SRBI-DESIGN VACUUM* AND the LCI Calculations | Course Height** (top Course) SRBI-DIAMETER* |
Output | RL (used for NID) Product Height** Minimum Allowable Wall Thickness** | Number of Girders required (optional) RL (for reference only) | RL (for reference only) |
Where to find it | RBI Analysis – Calculator Tab | Menu bar on Equipment Level | Menu bar on Equipment Level |
Notes | Recommended Approach | For first calculation, need to provide data for at least one inspection (with current wall thickness) | For a proper calculation of buckling, all Courses must be added. | If RL is lower than LC1, additional measures must be taken to assure integrity. |
Exceptions | LC1, LC2, and LC3 are not applicable to riveted Shells. | ||