physical properties    

Physikalische Daten

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

  • surface quality

  • working the ends

  • compliance with assembling conditions in accordance with pressure vessels regulations

  • tube length

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