在不超过与储罐深度对应的静压头的压力下工作，由1220平方毫米的压制钢板制成。截面尺寸可与1949年版标准的英制尺寸互换。交叉引用:BS 449:第1BS 449部分:第2BS 639BS 1387BS 1449部分:第1BS 1856BS 3692BS 4190BS 4211BS 4320BS 4360BS 4439BS 4504BS 5493PD 3343PD 4064

Working under a pressure not exceeding the static head corresponding to the depth of the tank, built up from pressed steel plates 1220 mm square. The sectional dimensions are interchangeable with the imperial dimensions of the 1949 edition of the standard.Cross References:BS 449:Part 1BS 449:Part 2BS 639BS 1387BS 1449:Part 1BS 1856BS 3692BS 4190BS 4211BS 4320BS 4360BS 4439BS 4504BS 5493PD 3343PD 4064