Page 54 - banneredThermosealCatalog2010

PAGE 2 of 2 Bolting Guidelines 061107
§ Most flanges are tightened with ordinary wrenching methods and it is often
advantageous to have design bolt stresses which require no more than this. The
probable bolt stress developed manually is often expressed as
2
b
b mm/N
d
1560
=S
Where:
Sb = bolt stress achieved on assembly
db = bolt diameter in mm
For smaller bolts this results in excessive stress unless care is exercised. For larger
bolts, however, it is often impossible to develop the required stress by hand.
REMINDER: As the temperature increases, the yield strength of the bolt material decreases.
The ability of a gasket material to make and maintain a seal depends not only on the quality of
the gasket material, but also on medium being sealed, the flange design, the amount of
pressure applied to the gasket by the bolts and how the gasket is assembled into the flanges
and tightened.
For product safety information, warranty and damage limitations, refer to the Material Safety
Data Sheet (MSDS).