Cashco 3700 User Manual
Page 3
3
IOM-3700
Center the gasket within the bolt circle of the tank
fl ange and carefully set the vent on the fl ange nozzle
and align the bolt holes.
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 fl ange
faces. Misalignment of fl ange faces will cause
bending stresses at the fl ange and fl ange joint and
damage may result. Correct any misalignment prior
to applying torque to nuts.
All nuts must be torqued 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’ nomi-
nal fl ange bore. Tank nozzle bore must be greater
than or equal to vent inlet fl ange bore. Inlet and
outlet piping loads must be supported by appropri-
ate structural supports, NOT by the vent body.
FLANGE
O.D. in.
I.D. in.
B.C. in
Bolt Hole in.
Quantity
Bolt
Torque
Lb.In.
SIZE
TYPE
20”
ASME
150#
27.50”
19.25”
25.00”
1.25”
20
110
24”
32.00”
23.25”
29.50”
1.38”
20
148
20”
API 650
26.00”
19.25”
23.50”
.75”
16
53
24”
30.00”
23.25”
27.50”
.75”
20
61
TABLE 1
Torque Requirements for Aluminum, Steel and Stainless Steel Vents