…..through the NFPA 1981/1982 2013 standard change in the Low Air Alarm End of Service Time Indicator (EOSTI)!
The NFPA 1981 2007 standard required the alarm to sound when 25% of the cylinder’s air was available. The NFPA 1981 2013 edition will increase that requirement to 33% of the cylinder’s available air.
The NFPA 1981 2013 edition is the first time the EOSTI level has actually been set for the fire service. The 25% number accepted for years came from a NIOSH standard that actually had a tolerance of 20% to 25%.
With the addition of the 33% threshold for reserve air, the fire service can now more closely follow the NFPA 1404 standard on Fire Service Respiratory Protection and Training which calls for:
- The individual shall exit from an IDLH atmosphere “before” consumption of reserve air supply begins.
- The individual shall recognize that the low air alarm notification indicates that the member is consuming the reserve air supply.
In the world of air management and firefighter safety, increasing the safety margin through additional reserve air and clear indicators of the use of reserve air is definitely a positive move!