Exact meaning for BS standard among steel pipe

We will ask for different standards when we negotiating with suppliers for seamless steel pipe or some specific welded steel pipe. What’s the exact meaning for those different standards among steel pipe? Today, we can have a view for some of them and get a basic understanding. Today, we will take BS standard for example. First of all, for BS3059 II, we can category 360 and 440 two main categories. BS3059 II 360: BS 3059-2:1990 would have the requirements for pipes not exceeding 127mm outside diameter and 12.5mm thickness. According to the operating temperature, it can be divided into two kinds general boiler pipes and high-pressure boiler pipes. BS3059-II 440: BS 3059 PART 2-78 is the standard which concludes the steel boiler and super heater pipes carbon alloy and specified elevated temperature prop.