OPENTECHNICAL PUBLICATION
OT-2026-000000733

Non-permissive fire connection system

Published: 2026-09-15T19:03:19.168351Z
Permanent URL: https://opentechnical.org/p/OT-2026-000000733
Categories: Sensors, Controls & Machine Vision > Industrial Control

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ABSTRACT

A system and method for preventing a hydrocarbon fuel from being pumped
through a fire department connection line (FDCL) of a building into a riser
line and a sprinkler system of the building (SSoB) is disclosed. The method
employs a non-permissive fire connection system (NPFCS) installed in-line with
the FDCL, within the building. The NPFCS includes a hydrocarbon detection
sensor (HDS), an electronic shut-off valve (ESV), an ESV activation logic
circuit, and a fail-safe logic circuit. The HDS is calibrated to detect a
hydrocarbon in a liquid being pumped into the FDCL. When the liquid is the
hydrocarbon fuel, a hydrocarbon is detected by the HIDS in the hydrocarbon
fuel being pumped into the FDCL. When the hydrocarbon is detected by the HDS,
the ESV activation logic circuit closes the ESV and shuts off the flow of the
hydrocarbon fuel into the riser line and the SSoB.

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OpenTechnical publication OT-2026-000000733
Published 2026-09-15T19:03:19.168351Z
https://opentechnical.org/p/OT-2026-000000733