There are various reasons for leaking flanges, some of these are:
INSUFFICIENT INSTALLATION GASKET STRESS
GASKET STRESS LOSS OVER TIME
GASKETS ARE NOT 100% TIGHT, etc
Our flange calculation analyses are made according to EN 1591-1:2014.
The method analyses the mechanical behaviour of flanges in 4 load conditions: Assembly, Test, Operating Condition 1 and Operating Condition 2.This method considers the mechanical strength and thermal behaviour of the flanges, bolts, nuts and gasket, and calculates the maximally possible installation bolt assembly force with which none of the components will be over stressed in any of the 4 load conditions.