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Nitrogen-Pac

The UNITED Fire Systems NITROGEN-PAC is a fully integrated nitrogen generating system 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 your sprinkler system riser.

Brochure – NITROGEN-PAC The Solution – UFS-300 (Rev-3.03)  UFS-300

NITROGEN-PAC Features

  • For dry or preaction sprinkler systems
  • Inerts and dries interior of pipe with nitrogen
  • Generates nitrogen from atmospheric air
  • Inhibits both oxidation corrosion (rust) and MIC.
  • Cost-effective continuous supply of 98% purity nitrogen
  • No inconvenient handling of high pressure cylinders
  • Low ongoing cost
  • Available as a self-contained (SC Series) system for smaller applications. Click here to learn more…
  • Available as a modular engineered (M Series) system for larger applications. Click here to learn more…
  • NEW! Automatic purging and nitrogen concentration display for ANY NITROGEN-PAC system! Click here to learn more…

NITROGEN-PAC Benefits

Lengthens life of pipe

  • Helps prevent:
    • Pipe wall thinning
    • Pinhole leaks
    • Pinhole leaks
    • Rust that clogs sprinkler heads
  • Reliable, dependable protection that works
  • Expert field and in-house technical support

Why Use Nitrogen?

Actual corrosion found during an NFPA 25 Internal Pipe Inspection performed by United Fire Protection.

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 this corrosion is best accomplished by greatly reducing or eliminating the amount of water and oxygen left in the pipe. Ordinary air compressors that are 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 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.


Section of pipe removed from preaction sprinkler, showing overall internal corrosion, accelerated corrosion at bottom from standing water, and edge corrosion from improper coupling groove placement. Not shown – pinhole leak in area of accelerated corrosion.

Articles On Corrosion

To learn more about corrosion in general, click on the links below…

NITROGEN-PAC Resources

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Did You Know?
  • If you have a dry standpipe in your structure, can you tell if it’s intact and ready for fire department use? If it’s not, the risk is high.  Be sure – a UNITED Fire Systems STANDPIPE-PAC system will alert you if someone accidentally leaves a valve open or even disassembles a portion of the standpipe inadvertently.