Cashco 5400 - Manual (Page 3)

3 IOM-5400
SECTION V
V. INSTALLATION
The Model 5400 POVV is a precision device that
must be hanled carefully to ensure seat tightness.
WARNING
The vent must be installed in a vertical position. The
tank nozzle on which the vent is mounted should have
the same nominal diameter as the venting device. It
is recommended that the tank nozzle fl ange face be
within 1 degree of horizontal for best performance of
the venting device.
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 piping
loads must be supported by appropriate structural
supports, NOT by the vent body.
1. At installation, the POVV should be carefully
lifted into position using the lifting lugs on the
body. Use the weather hood to help align the
body directly over the tank nozzle. DO NOT
use the pilot valve or pickup line to pull the
POVV into position.
2. Aluminum valve body should be mated to
fl at-faced 125# ASME fl anges. Mating fl anges
should be fl at within 0.020” and clean; free
of scratches, corrosion and tool marks. A full
faced gasket is recommended.
3. Install the fl ange gasket on the nozzel face.
Use either a full faced or ring gasket for
raised face fl anges. Ensure that the gasket
material is suitable for the service. See Table
1 for gasket dimensions.
Table 1
Body Flange Gasket Dimensions
CS, SST
150# ASME RF
O.D. I.D. B.C. Hole Qty
2’ 4.12 2.38 -- -- --
3” 5.38 3.50 -- -- --
4” 6.88 4.50 -- -- --
6” 8.75 6.62 -- -- --
8” 11.00 8.62 -- -- --
10” 13.38 10.80 -- -- --
12” 16.12 12.80 -- -- --
Alum w/ 125#
ASME FF
2” 6.00 2.00 4.75 .75 4
3” 7.50 3.00 6.00 .75 4
4” 9.00 4.00 7.50 .75 8
6” 11.00 6.00 9.50 .88 8
8” 13.50 8.00 11.75 .88 8
10” 16.00 10.0 14.25 1.00 12
12” 19.00 12.00 17.00 1.00 12
4. Center the gasket within the bolt circle of the
tank
nozzle fl ange.
5. Lubricate all studs and nuts with an appropri-
ate thread lubricant. If stainless steel studs
and nuts are required, use an anti-seize lubri-
cant such as moly-disulfi de.
6. Remove fl ange protective cover and carefully
set the POVV down on the gasket and face of
the nozzle fl ange.
7. Install lockwashers and nuts. Tighten nuts
to half the recommended torque value using
an alternating crossing pattern. See Table 2.
Table 2
Recommended Minimum Torque Values *
Size
Qty
Holes
Bolt
(UNC)
Torque (lb-ft)
Raised Face Flat Face
2” 4 5/8”-11 31 81
3” 4 5/8”-11 43 106
4” 8 5/8”-11 29 68
6” 8 3/4’10 51 101
8” 8 3/4”-10 78 142
10” 12 7/8”-9 75 138
12” 12 7/8”-9 93 179
* Torque vlaues are based on a gasket factor m = 3.5,
gasket factor y = 4000 psi, operating pressure = 30 psi
8. Make sure that the gasket is compressed
evenly and the fl anges are not distorted.
NOTE: Misalignment of fl ange faces will cause
bending stresses at the fl ange and may damage
fl ange joint.
9. Finish tightening nuts to the point that no ad-
ditional rotation occurs.