FM Global approval is based upon a satisfactory evaluation of the product and the manufacturer in the following major areas:

  • The structural integrity of the tanks to withstand anticipated design conditions
  • The ability of the manufacturer to properly design, fabricate and install bolted steel tanks in accordance with industry practices and the requirements of FM approvals, and
  • The ability to provide a highly reliable and durable structure for the storage of water for fire protection purposes.

FM 4020 are essentially the same provisions for steel tanks, but to a higher degree. The 3rd party certification approval from FM is to ensure that the particular tank that is being designed is so to the highest standard. All Facility’s and building materials must be tested, inspected and approved according to FM QC requirements to be considered FM approved.

Drawings, calculations, along with the manufactured tank must be to FM Standards and approved and stamped.

FM approves specific tanks and sizes to be installed in various designated seismic zines and categories/Occupancy’s. FM recognizes the following (5) earthquake seismic criteria:

50-year
100-year
250-year
500-year
>500-year

The listed seismic categories are based on the return period of a seismic event of damaging ground motion.