指定两种类型的可视流量指示器，用于盛装油或水的储罐的溢流管道系统。A类包括易燃液体的指示器，包括特殊功能，以确保火灾条件下指示器的完整性，B类包括非易燃液体的指示器。交叉引用:BS 1452*BS 1832*BS 3463*BS 3643:第2部分*BS 3692*BS 4439*BS 4504*

Specifies two types of sight flow indicators for use in the overflow piping systems from tanks containing oil or water. Type A covers indicators for flammable fluids incorporating special features to ensure integrity of the indicator during fire conditions, and Type B covers indicators for non-flammable fluids.Cross References:BS 1452*BS 1832*BS 3463*BS 3643:Part 2*BS 3692*BS 4439*BS 4504*