Viking ESFR, Manual

Page: 16 / 53

16
imperfections. Also, pipes should be capped to prevent
contaminant during shipping, storage, etc.
•
Antifreeze solution is very lubrise and difficult to seal
compared to plain water and initial care in pipe connections
will minimize leaks at start-up. Also, antifreeze solution will
prevent microbiological attack to piping material 5 times
greater than water. Cleanliness is required to improve
longevity of solution. Prefabricated pipe should be capped
during shipping and staging prior to installation.
•
If grooved couplings are utilized in the system piping
installation, "flush seal" gaskets, low temperature EPDM
rubber and lube are required. Pooling of propylene glycol in
the system shall be eliminated. Vent valves shall be
minimum ½” ball valves with ½” plug. Vent valves can
double as solution test points as well; the Viking Model AV-1
Air/Vent Valve is recommended, as it includes strainer and
test connection for automatic venting during fill and drain of
the system. Material installed on the system shall be
compatible with propylene glycol solution. A re-claim tank
with adequate capacity of the largest system(s) shall be
located near the system riser(s). System drain piping shall
be arranged to discharge to the re-claim tank.
5.1.2 Primary Check Valve Main Drain
The main drain outlet should be
directed to an appropriate
location, and the drain valve shall
be installed at an accessible level
so it can be operated from the
floor level. Installing the isolation
Easy Riser
TM
Check valve at an
elevation near the horizontal
mains supplying the system and
10 to 15 ft (3,0 to 4,5 m) above the
primary check valve will reduce the cold thermal transfer of propylene
glycol solution in the system piping to the vertical system riser and
minimize frosting on the system riser.
The main drain valves from the isolation check and primary check valves
shall be installed at an accessible level, as the solution will be trapped in
the drop leg to the drain valve and will not affect the total calculation for
the system. The main drain valve will be used to drain the system piping
downstream of the Easy Riser
TM
Check Valves. As the cold antifreeze
from the freezer area will emit cold thermal transfer, it will be required to
insulate the drain pipe to prevent frosting.