UNITED Nitrogen Pac SC-W, Installation, Commissioning Maintenance

Page: 29 / 112

UNITED FIRE SYSTEMS - NITROGEN-
PAC™
MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
18
Table 1
Information To Be Obtained During Survey (Continued)
Item No. Item Result
6
Is the nitrogen system
required to provide initial-fill
air in the NFPA 13 required
30 minutes?
If YES , then the Model SC-W compressor must supply enough air for
BOTH initial-fill and nitrogen generation for all risers.
If
NO , then the Model SC-W compressor must only supply air for nitrogen
generation. An external compressor must be used for initial-fill.
7
Are the sprinkler systems
NEW or EXISTING?
If NEW , significant gas pressure leakage is not likely. The maximum
leakage is 1-1/2 PSIG in 24 hours starting at 40 PSIG.
If
EXISTING , significant gas pressure leakage is likely. To ensure
minimum compressor run time and lengthen compressor life, test for and
correct leaks until total leakage is no more than 1-1/2 PSIG in 24 hours
starting at 40 PSIG.
8
Are any of the sprinkler
system(s) equipped with
quick-opening devices (dry
accelerators)?
If YES , the action of the dry accelerator during purging is important. To
avoid inadvertent sprinkler valve tripping, consider replacing the dry
accelerator with a new device, or close the inlet valve to the dry
accelerator during purging.
NOTE: Closing the dry accelerator inlet valve may result in lengthened
time for water to reach the most remote sprinkler head(s). Ensure that the
Authorities Having Jurisdiction and the owner are in agreement regarding
closing the dry accelerator inlet valve
If
NO , no additional consideration is needed.
9
Where will the nitrogen
receiver be located?
If WALL-MOUNT , choose Model NR-5.
If RISER-MOUNT , choose Model NR-5.
If FLOOR-MOUNT , choose Model NR-10.
10
Will Riser 1 have manual or
automatic N
2
purity sensing
and purging?
If MANUAL , no additional consideration is necessary.
If AUTOMATIC , choose
TRUE ADVANCED PURGE™ Model TAP-G3
device.
Will Riser 2 have manual or
automatic N
2
purity sensing
and purging?
If MANUAL , no additional consideration is necessary.
If AUTOMATIC , choose
TRUE ADVANCED PURGE™ Model TAP-G3
device.
11
Will Riser 1 need automatic
corrosion monitoring?
If YES , include a Model CMA-1
– Corrosion Monitor Assembly.
If NO , no additional consideration is necessary.
Will Riser 2 need automatic
corrosion monitoring?
If YES , include a Model CMA-1
– Corrosion Monitor Assembly.
If NO , no additional consideration is necessary.