tubes and capillaries pressure resistance
Pressure resistance (p) calculation with a known wall thickness (Wt) and a given outside diameter (OD): p = (Wt x 20 x K/S) : (OD-Wt)
Wall thickness (Wt) calculation with a given pressure resistance (p) and outside diameter (OD): Wt = (OD x p) : (20 x K/S + p)
OD = outside diameter in mm
Wt = wall thickness in mm
p = pressure resistance in bar
K/S = admissible stress in N . mm-2
SIMAX borosilicate glass 3.3 admissible stress: K/S = 7 N . mm-2 according to ČSN EN 1595 Standard: Pressure Vessels Made of Borosilicate Glass 3.3; General Principles for Construction, Manufacturing and Testing..
Pressure resistance (p) affects, among others, the following:
thermal difference between the inside and outside walls
working the ends
compliance with assembling conditions in accordance with pressure vessels regulations
The manufacturer may perform an exact calculation, where necessary.
In addition, the following should be taken into consideration:
ČSN EN 1595:1998 Pressure Vessels Made of Borosilicate Glass 3.3 General Principles for Construction, Manufacturing and Testing
ČSN EN 12585:1999 Glass Equipment, Pipes and Pipe Fittings. Piping and Pipe Fittings with a NominalDiameter of DN 15 to 1000. Compatibility and Interchangeability