# Kinds of flange unit weight calculation

- Jul 05, 2017-

1:Plate flange(FF):

Remark: weight=Volume*density

304 density:7.93g/cm3

316 density:7.98g/cm3

Carbon steel density:7.85g/cm3

Example: 304( Density7.93g/cm3):
Flange volume=Outside volume- inside volume- bolts number* bolts volume
=[π*(OD/2)*(OD/2)-π*(ID/2)*(ID/2)-π*bolts number*(bolt hole size/2)*(bolt hole size/2)]*thickness
=π/4*(OD*ODID*IDBolts number*bolts hole size*bolts hole )*thickness
(unit:mm)

Density=7.93 (unit:g/cm^3)=7.93/1000 (unit:g/mm^3)=7.93/1000000 (unit:Kg/mm^3)

Flange weight=(OD*ODID*IDbolts number*bolts hole size* bolts hole size)*thickness*π/4*7.93/1000000(Kg/mm^3)
(Unit :mm)
=(OD*ODID*IDBolt numbers* bolt hole size* bolt hole size)* thickness*6.228/1000000( unitKg)
(unit :mm)

2:Flat face(FF) blind flange:
=(OD*ODBolt numbers* bolt hole size* Bolt hole size)*Thickness*6.228/1000000(UnitKg)
(Unit :mm)

3:Rasied face (RF) plate flange(plate + rasied:

=[(OD*ODID*IDBolt number* bolt hole size* bolt hole size)* thickness of flange+(OD of Hub* OD of hub - ID* ID)* Thickness of hub]*6.228/1000000
(Remark : The thickness of flange is not include the thickness of hub)
=[(OD*ODID*IDBolt number*bolt hole size*bolt hole size)*thickness of flange-(OD*OD-OD of Hub* OD of Hub- bolt numbers* bolt hole size*bolt hole size)* thickness of hub]*6.228/1000000
(Remark: The thickness of flange included the thickness of hub)

4:Vlaum of weld neck flange=1/3*π*(R*R+R*r+r*r)*h