Flange Pair

Flange pair is modeled same way as valve. Flange weight is considered the same as for a valve. Flange leakage check is automatically done when the "check leak resistance" flag is checked.






Element name. If checked then it shown in 3D view

Length, H

Full flange pair assembly length


Flange pair assembly weight with bolts and nuts without insulation and product weight. Product and insulation weight are calculated automatically based on adjoining pipes.

Flange leakage check

Flange leakage check will be done if this option is selected

Leakage Check Method

Choose one of flange leakage check methods

Insulation joint (Insulation Kit) stresses are checked according to manufacturers recommendations using 72% or 75% of yield stress allowable:

Following equation for 72%:

Following equation for 75%

Flange Code

Choose flange code: GOST, ASME B16.5, EN 1092-1

Gasket Effective Diameter, G

G - Diameter at location of gasket load reaction per ASME B 16.20 & ASME Sec. VIII Div. 1, Appendix 2, Table 2-5.2

For ASME B16.5, EN 1092-1 flanges G value should be calculated using following equations:

OD – Outer diameter of gasket

ID – Inner diameter of gasket

b0 - Basic gasket seating width as given in Table 2-5.2 of ASME VIII Div. 1, Appendix 2

b – Basic gasket width

Cb=0.5 for U.S. customary calculations, 2.5 for SI calculations

Nominal Pressure PN / Class

Nominal Pressure PN for GOST and EN 1092-1 flanges and Class for ASME B16.5 flanges

Material Group

Flange material group according to the selected code

ASME B16.5-2020

EN 1092-1:2013

Factor Fm

Factor Fm used in Code Case 2901 (PVP) method according to following table

Bolt Area, Ab

Bolt Circle Diameter, C

Bolt Material

Choose Material From database

Menu and Toolbar Access

To insert a flange, select the desired node and use the menu option: Insert > Insert Flange Pair

or press the toolbar icon.