Vent Line / In-Line Parallel Plate
Flame Arrester is designed for
installation in open vent pipe or
bleed lines from storage or pro-
cessing tanks. Suitable for NEC
Group D (IEC Group IIA) vapors
Combination Pressure / Vacuum
Relief Vent & Flame Arrester
provides pressure and vacuum
relief as well as protection from
propagation of externally intro-
duced flames. Suitable for NEC
Group D (IEC Group IIA) vapors.
Emergency Vent protects tanks
against rupture or explosion
resulting from excessive
internal pressure caused by
exposure to fires.
Series 4950
Series 830
Series 7800
Pipe-Away Pressure Vacuum
Relief Vent for applications that
require hazardous vapors be
processed into manifolded
piping and not released into the
atmosphere
Series 18540
Installation & Maintenance
Series 54000
Spring Loaded Emergency Pressure Vent
ADDITIONAL PRODUCTS FROM PROTECTOSEAL
©2012 The Protectoseal Company
VM-54000/1
PROTECTO
SEAL
®
Safety Without Compromise
225 Foster Ave., Bensenville, IL 60106-1690
P
630.595.0800
F
630.595.8059
[email protected] www.protectoseal.com
Spring Package Disassembly & Reassembly
Measure the compressed height of the springs in the spring
package (See Detail A) and record this dimension for later
use.
NOTE: This compressed spring height is critical in
that it establishes the set point of the vent.
1.
The studs on the vent are long enough so that all com-
pressive force of the springs can be relieved as spring
nuts are loosened. As the nuts are loosened, the spring
guides will move upwards, relieving spring forces. The
spring nuts should be loosened alternately and evenly so
that each of the springs are allowed to expand evenly
until the free length of the springs is reached.
2.
Once the spring forces have been relieved, the spring
nuts, spring guides, springs and pallet assembly may be
removed for inspection.
3.
Inspect the diaphragm. If the diaphragm is deteriorated it
should be replaced. Make sure that the nut securing the
diaphragm is fastened securely.
4.
Inspect the seating surface. It should be smooth and free
of dirt or nicks. If necessary, clean the seating surface
with an appropriate cleaner or solvent.
CAUTION: Do not use a file or sharp tool that
may damage the seat surface.
5.
Reassemble the spring package assembly in the reverse
order to above. Install pallet assembly, lower spring
guides, springs, upper spring guides and spring nuts.
Slowly compress the springs by tightening the spring
nuts evenly and alternately until the springs are at their
compressed height that was measured in Step 1 of this
process.
NOTE: This compressed spring height is criti-
cal in that it establishes the set point of the
vent.
6.
Tighten spring nuts to secure position of spring plate.
7.
Reinstall the screen, weatherhood, hood nuts and lifting
lugs.
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