The liquid argon calorimeter valve box has two vessels. Both must be seen as pressure vessels and so they are subject to the CODAP safety rules. Guidance in these matters is done by the Technical Inspection & Safety Commission TIS of CERN.

The results of the cryovessel, and the vacuumvessel, calculations are found in table form. Here are found the finite element calculations and the value of the by hand calculated average stress. For the hand calculations we made use of the following theories.

The collaps pressure in accordance to Marks' "Standard handbook for mechanical engineers".

The stresses in the 10% heads were found with formulas from "Roark's Formulas for Stress & Strain".

The occurring average stresses were obtained by using formula's for describing stress and strain in a cylindrical vessel.

An additional calculation provides the occurring stress in the welding spot, at the edge of the cylindrical vesselpart. These formulas come from, "Theory of plates and shells".

Due to the shape of the 10% head, stresses occurring at the welding spot are less than stresses in the bending of the 10% head.