3
IOM-3600
Fiberglass flanges 2 inch to 12 inch require the use
of a full-face 150 lb. gasket. For full face gaskets,
we recommend the use of a 1/8-inch Gortex gasket.
Center the gasket within the bolt circle of the tank
flange, align the bolt holes and carefully set the vent
on the flange nozzle.
NOTE:
At installation, the vent valve should be care-
fully lifted into position using the lifting brackets (2)
on the body.
All stud threads must be lubricated to obtain proper
torque results. A washer should be used under each
stud nut.
Install the studs, washers and nuts and tighten nuts
hand tight. Check proper alignment of flange faces.
Misalignment of flange faces will cause bending
stresses at the flange and flange joint and damage
may result. Correct any misalignment prior to
applying torque to nuts.
All nuts must be tightened in proper sequence and
equal increments. Proceed through the tightening
sequence until the recommended torque is attained.
Recheck the torque on each bolt in the same
sequence as bolts previously tightened may have
relaxed through the torque sequence.
WARNING
Minimum clearance between tank roof and vacuum
inlet port must be at least equal to the vents’
nominal flange bore. Tank nozzle bore must be
greater than or equal to vent inlet flange bore.
Inlet and outlet piping loads must be supported by
appropriate structural supports, NOT by the vent
body.
MOUNTING
FLANGE SIZE
BOLT TORQUE -
Ft. lbs.
NUMBER
BOLTS
FLAT FACE
2”
20
4
3”
20
4
4”
20
8
6”
30
8
8”
30
8
10”
30
12
12”
30
12
Bolt Torque for FRP Flanges Drilled to
ASME #150 Flange Connections
MOUNTING
FLANGE SIZE
BOLT TORQUE -
Ft. lbs.
NUMBER
BOLTS
2”
47
4
3”
4
4”
8
6”
83
8
8”
8
10”
134
12
12”
12
TABLE 1
Torque Requirements Are Dependant
On Gasket Material.
Bolt Torque Speci
fi
cations -
ASME #150 Flange Connections
CAUTION
The lifting brackets should only be used for lifting the
vent valve into place and should NOT be used for any
other purpose.