UL Recommends Inspection of Fire Department Connection (FDC) Hinge Pins (Release 19PN-03)


NORTHBROOK, Ill., March 15, 2019 — UL recommends those responsible for conducting acceptance testing and inspecting Fire Department Connections in accordance NFPA 25 (Standard for the Inspection, Testing and Maintenance of Water-Based Fire Protection Systems) verify proper securement of the hinge pin.  Based on reports received by UL, hinge pins that are threaded into the FDC body may become loose or displaced in the field if they are not secured properly. Action should be taken to confirm that hinge pins are properly tightened and secured from movement. The FDC manufacturer should be consulted for guidance on specifications for tightening or other means of securement.

The displacement of the hinge pin from the FDC can cause the clapper (an integral component of an FDC that provides a water seal and allows water flow in only one direction) to become dislodged from its intended location.  If the clapper hinge pin is separated or missing, immediate action shall be taken to retrieve the clapper from the fire protection system piping to prevent blockage of water flow.  If the FDC is damaged, repair or replacement should be considered. 

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UL fosters safe living and working conditions for people everywhere through the application of science to solve safety, security and sustainability challenges. Our nonprofit parent organization engages in standards development, scientific research, education and public outreach activities. Our commercial businesses test, inspect, audit, certify, validate, verify, advise and train and we support these efforts with software solutions for safety and sustainability. The UL Mark engenders trust, enabling the safe adoption of innovative new products and technologies. Everyone at UL shares a passion for making the world a safer place. To learn more about our business solutions, visit UL.com.

Michelle Press

Communications Director



Release No. 19PN-03


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