Bolted tanks up to 40 ft square and 12 ft deep excluding supporting structures not subject to pressure other than static head with internal or external flanges and open or closed tops, and made from unit plates 2, 3 or 4 ft square. Mild steel tie rod ends and turnbuckles, sizes and thicknesses of unit plates. Illustrations of typical tanks, tables of scantlings and of approximate weights and nominal capacities.Cross References:1486-184158081672004862315872613861861-14614624634646435297161290394465590166378148259182530235064976514401856257326422947Building (Safety, Health and Welfare) Regulations, 1948Electricity (Factories Act) Special Regulations, 1944Electricity Regulations, 1908