UNITED Nitrogen Pac SC-W, Установка, наладка, обслуживание

Страница: 13 / 112

UNITED FIRE SYSTEMS - NITROGEN-
PAC™
MODEL SC-W
INSTALLATION, COMMISSIONING, AND MAINTENANCE MANUAL
REVISION 1.01 MAR 2021 - P/N 30-NPWICM-000
2
1.2. SYSTEM PURPOSE. The FM Approved UNITED Fire Systems NITROGEN-
PAC™
Model SC-W Sprinkler
Corrosion Inhibiting System is a fully integrated nitrogen generating system designed to introduce high-purity
nitrogen into preaction or dry sprinkler piping.
NITROGEN-
PAC™
replaces the existing air compressor, providing
the necessary supervisory pressure in the form of nitrogen instead of air. NITROGEN-
PAC™
occupies minimal
space, operates quietly, and can be installed near the sprinkler system riser(s).
The interior of preaction and dry sprinkler piping is subject to corrosion, which can lead to clogged sprinkler heads,
leaks, and pipe failure. This corrosion can be of two distinct types. Oxidation corrosion takes place in the presence
of oxygen, and is accelerated by the presence of water. Microbiologically influenced corrosion (MIC) takes place in
the presence of certain microbes that attack metal, again in the presence of water and in many cases oxygen.
Reducing the damaging effects of corrosion is best accomplished by greatly reducing or eliminating the amount of
water and oxygen left in the pipe. Ordinary air compressors used to provide supervisory pressure keep the oxygen
concentration inside the pipe the same as normal air
– ideal for oxidation corrosion to take place. Ordinary
compressors also do not dry the air
– residual water from system testing remains in low points, and moist air can
actually increase standing water within pipes from condensation. The introduction of high-purity dry nitrogen with a
low dew point reduces or eliminates these two problems. The interior of the pipe remains dry, with very little oxygen
remaining to attack the metal.