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Technical Notes

Technical Notes from UNITED Fire Systems

  1. March 2025 – Technical Note – UFS-25-01 Rev 1.00 – TAP In-Line Air Filter – To help prevent issues with TRUE ADVANCED PURGE™ (TAP) devices, UNITED Fire Systems now provides an in-line air filter to reduce debris in the tubing line from the Purge Vent Assembly Model PVA-2 from contaminating the TAP device. The filter is lightweight and compact, and the flexible mounting orientation makes it easy to install the filter in the tubing line. The filter should be installed at the time of system installation. Filters are also available from UNITED Fire Systems to retrofit existing installations. Click here to learn more
  2. March 2025 – Technical Note – UFS-24-01 Rev 1.02 – As part of our program of continuous improvement, UNITED Fire Systems has implemented improvements to the TRUE ADVANCED PURGE™ Model TAP-G3 device in response to several issues. Click here to learn more
  3. April 2024 – Technical Note UFS-24-01 – TRUE ADVANCED PURGE™ MODEL TAP-G3 RECENT ISSUES AND RESOLUTIONS As part of our program of continuous improvement, UNITED Fire Systems has implemented improvements to the TRUE ADVANCED  PURGE™  Model  TAP-G3 device in response to several issues. Click here to learn more
  4. February 2017 – Technical Note UFS-17-03 – This Technical Note covers sprinkler air and nitrogen requirements in NFPA Standards. Provide this Technical Note to any user that has questions about sprinkler air and nitrogen requirements in NFPA Standards. Click here to learn more…
  5. January 2017 – Technical Note UFS-17-01 covers oil “leakage” from NITROGEN-PAC™ M Series Compressor / Tank Assemblies (CTAs). Provide this Technical Note to any user that has a concern about oil appearing on or around their CTA – UFS-17-01 Rev 1.00 Technical Note – NITROGEN-PAC Oil-Filled Compressors
  6. January 2017 – Technical Note UFS-17-02 covers condensate drainage from NITROGEN-PAC™ systems. Provide this Technical Note to any user that has questions about draining the condensate from their NITROGEN-PAC™ system, including what to do if a pump is needed – UFS-17-02 Rev 1.00 Technical Note – NITROGEN-PAC Condensate Drainage
  7. October 2015 – STANDPIPE-PAC Technical Note Regarding Lessons Learned About Temperature & Required Maintenance – UFS-15-02 Rev 1.01 – Technical Note – STANDPIPE-PAC Lessons Learned
  8. January 2015 – STANDPIPE-PAC Technical Note Regarding Location, Inspection, and Maintenance – UFS-15-01 Rev 1.00 – Technical Note – STANDPIPE-PAC Location, Inspection & Maintenance
  9. December 2013 – Victaulic Company Technical Service Bulletin regarding inspection of the Firelock NXT Deluge and Preaction Actuated Valves – Series 769 (All Sizes) – UFS-13-01 Rev 1.00 – Technical Note – Victaulic Technical Service Bulletin

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Did You Know?

  • The design, installation, and maintenance of preaction sprinkler systems are governed by multiple national standards and codes. For example, the detection portion of the systems comes under NFPA 72 – National Fire Alarm Code. The design of the mechanical portion is covered by NFPA 13 – Standard for the Installation of Sprinkler Systems. The standard for ongoing inspection and maintenance of the system is NFPA 25 – Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems. Keep it simple – choose PREACTION-PAC and you will receive one instruction manual containing all that you need.