Saddles: The input for allowable anchor bolt shear stress is a user defined input. COMPRESS does not investigate possible uplift on the foundation for saddles. Most horizontal vessels will not be subject to uplift. Some designers are building vessels for floating platforms and applying lateral forces equivalent to multiple 'g' forces; in such a case uplift may result. In this case even the 'Zick' analysis for stresses in the shell should be reviewed to determine if it is still applicable. Such usage is currently outside the scope of COMPRESS.

Base Rings for Support Skirts: By default, this value is 20,000 psi. If changed to '0', the value is changed to 20,000 psi when the calculations are run.

For vertical vessels supported on skirts, COMPRESS does not investigate shear on the anchor bolts. Generally, shear force due to wind/seismic would be taken out by friction between the base plate and the foundation (grout) or, if the force is great enough, shear bars should be provided.

Support Legs: By default, this value is 20,000 psi. If changed to '0', then the value is changed to 20,000 psi when this input loses focus (ie: you move the cursor to another field).

For vertical vessels supported on legs, COMPRESS does not investigate shear on the anchor bolts. Generally, shear force due to wind/seismic would be taken out by friction between the base plate and the foundation (grout) or, if the force is great enough, shear bars should be provided.

Support Lugs: No investigation is made of anchor bolts for support lugs.