Mich. Admin. Code R. 339.5244 - Portable boilers
Rule 244. Portable boilers, used for purely portable purposes and transported from place to place, must comply with the rules for new construction when reinstalled at a new location. These portable boilers must have a factor of safety of at least a 5.5 strength-to-strength ratio for butt-strap construction and a factor of not less than a 6 strength-to-strength ratio for lap-seam construction.
Notes
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