different parameters in order to obtain a valid
installation.
The defined parameters are:
Safety coefficient used in the calculation
It does not meet the minimum security coefficient.
Working pressure (bar): Pi
The working pressure has been reduced
considerably and has not reached an optimum
result.
Height of cover above pipe crown (m): H
The height of cover has been modified and the
safety coefficients are not satisfactory.
Nominal pressure (bar)
The calculation has been done with the smallest
traffic load (LT12) and the safety coefficients are
not satisfactory. The only option that is more
favourable is an installation without concentrated
traffic loads.
Case where the selected installation has no
concentrated traffic loads:
The calculation has been done with the maximum
nominal pressure (PN25) and the safety coefficients
are not satisfactory.
The installation has no concentrated traffic loads
and the safety coefficients are not satisfied.
Bedding angle (º): 2α
Case where the selected installation has distributed
The calculation has been done with the maximum traffic loads:
bedding angle (180°) and the safety coefficients are
not satisfactory.
The installation has been calculated with
distributed traffic loads and the safety coefficients
Traffic
are not satisfactory.
Case where the selected installation has
concentrated traffic loads:
The TOM® Mechanical Calculation Program is
accessible through the web application: www.
tomcalculation.com
23
TN October 2016