BS 417-1:1964

Cold and hot water storage vessels for domestic purposes, as follows: Cisterns: 20 sizes, from 4 to 740 gallons capacity, in two grades; with covers. Tanks: 5 sizes, from 21 to 34 gallons capacity, in two grades. Cylinders: 10 sizes, from 16 to 97 gallons capacity, in three grades. Materials, workmanship, design and construction, dimensions and tolerances; provision for pipe connections and electric immersion heater and gas circulator connections. Optional internal coating of cisterns with bitumen, testing and marking requirements, test pressures and working heads.