3
IOM-5400
SECTION V
V. INSTALLATION
The Model 5400 POVV is a precision device that
must be handled 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 flange 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’
nominal flange bore. Tank nozzle bore must be
greater than or equal to vent inlet flange 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
flat-faced 125# ASME flanges. Mating flanges
should be flat (within 0.020”), clean, and free
of scratches, corrosion and tool marks. A full
faced gasket is recommended.
3. Install the flange gasket on the nozzle face.
Use either a full faced or ring gasket for
raised face flanges. 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 flange.
5. Lubricate all studs and nuts with an appropriate
thread lubricant. If stainless steel studs and
nuts are required, use an anti-seize lubricant
such as moly-disulfide.
6. Remove flange protective cover and carefully
set the POVV down on the gasket and face of
the nozzle flange.
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 values 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 flanges are not distorted.
NOTE:
Misalignment of flange faces will
cause bending stresses at the flange and may
damage flange joint. Reference Addendum A
on pages 15-16.
9. Finish tightening nuts to the point that no
additional rotation occurs.
