I recently was helping a client with some questions regarding their CAT 1B Flammable Refrigerant Process and was surprised to see that the “new” MAQ for these refrigerants is 10,000 pounds. Add the footnote exceptions, and we could have 30,000 pounds of this flammable refrigerant in a single fire area, either in “storage” or in a “closed system.”
NOTE: these flammable gases are a PSM flammable gas and have a TQ of 10,000 pounds. But as I have been saying for 10 years, don’t be surprised when OSHA says that only Cat 1A are PSM flammable gases. They have already updated the HAZCOM standard by redefining flammable gas categories.