How to Change Respirator Cartridges

In order to protect workers from inhaling toxic contaminants, respirator cartridges must be changed on a regular schedule depending on a number of factors, including the concentration of the contaminant, frequency of use, breathing rate, and presence of "potentially interfering chemicals." Traditionally, wearers have relied on the warning properties of a contaminant--odor detection, for example--in order to determine when to change the cartridges on their masks. However, several cartridges are now equipped with End of Service Life Indicators (ESLIs) to avoid over-exposing workers to hazardous air contaminants. Cartridges protecting against hydrogen sulfide, carbon monoxide, and mercury vapor all contain ESLIs. Regardless of what type of detection system you use, be sure to err on the conservative side if you doubt the effectiveness of your current cartridge.

Things You'll Need

• Respirator
• Cartridges
• Manufacturer's manual

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Instructions

• 1

  Obtain specific data related to the factors that influence your respirator cartridge change schedule. Take note of the physical parameters for your contaminant, such as chemical name, liquid density, and molecular weight. Determine the maximum expected temperature and humidity of your workplace, the maximum concentration of contaminants, and the volumetric flow rate of your contaminant in liters per minute (LPM). Visit the Occupational Safety & Health Administration (OSHA) website to view a comprehensive list of relevant variables.

• 2

  Use the data you obtained to estimate your cartridge's service life. Using your manufacturer's recommendation as a starting point, further refine your estimation by entering the variables into a math model, such as Advisor Genius, which can be found on the OSHA website. The math model is especially useful if your working conditions have an unusually high temperature or humidity level.

• 3

  When the service life of your cartridge runs out, unscrew the cartridge in a clockwise direction until it detaches from the mask.

• 4

  Take the new cartridge and screw it into the mask to replace your old cartridge. Repeat Steps 3 and 4 for the other cartridge on your mask. Make sure that the cartridges are secured tightly to your respirator before entering a contaminant-filled environment.

• 5

  Use your respirator with the new cartridges installed. If you notice an unusual odor or experience irritation of any kind, leave the contaminated environment immediately. One or more of the cartridges you installed may be defective. Consult your manufacturer for further assistance.