Ansul Bursting Disc 417911 (10 Pack)

The Ansul 417911 is a 10-pack of replacement bursting discs for use in Ansul agent cylinders. The bursting disc is a pressure-rated frangible element installed in the agent cylinder's discharge path — it maintains system integrity under normal standby pressure while rupturing cleanly at the rated burst pressure during system discharge to allow agent to flow through the distribution piping to the suppression nozzles. A bursting disc that has been previously discharged, shows corrosion pitting, or has been physically deformed must be replaced before the cylinder is recharged and returned to service.

The bursting disc is a single-use component by design. After any system discharge the disc has ruptured and must be replaced with a new 417911 disc before recharging. Additionally, any bursting disc that has been subjected to pressure cycling over time — even without rupturing — may develop fatigue that reduces the burst pressure from the rated value, potentially causing premature disc rupture during normal system pressure fluctuations or failure to rupture at the correct pressure during an actual fire event. The ANSUL R-102 system service manual specifies disc replacement intervals as part of the scheduled maintenance program.

The 10-pack format provides sufficient discs for high-volume ANSUL R-102 and compatible system service. Available through authorized ansul distributors as part of the ANSUL fire suppression system parts service catalog. The ansul tanks and agent cylinder maintenance program requires bursting disc inspection at every semi-annual NFPA 17A and NFPA 96 visit, with replacement after every discharge and per the scheduled interval in the ansul system repair documentation.

Inspect the bursting disc at every semi-annual NFPA 17A service visit. Check for corrosion pitting, deformation, or any indication of prior pressure stress. Replace the disc immediately if any defect is found — a compromised disc may not rupture at the correct pressure, causing either premature discharge or failure to discharge during an actual fire event. Replace with a new 417911 disc after every system discharge as part of the standard post-discharge service procedure. Document disc inspection and replacement in the fire suppression system inspection record per the ANSUL R-102 system service requirements.

Can the 417911 bursting disc be reused after inspection if it appears undamaged?

No. Bursting discs are single-use components. After any system discharge the disc has ruptured and must be replaced. Even on un-discharged systems, the disc must be replaced per the scheduled interval in the ANSUL service documentation — metal fatigue from pressure cycling can reduce burst pressure below the rated value without visible surface damage. Always install a new 417911 disc from the 10-pack at every scheduled replacement interval.

Is the 417911 used in both the R-102 and Piranha systems?

Verify which ANSUL system configurations use the 417911 disc using the ANSUL parts documentation for your specific system. The ANSUL product family includes multiple agent cylinder configurations across the R-102, Piranha, and Checkfire product lines — confirm the correct disc part number for each cylinder type through authorized ansul distributors before installation.