Hello mariog

The final outcome of this correspondence throws light on a very simple problem. By the codes (API, ASME and B31.xx) trying to marry the metric and Imperial systems together in one code has not been completely successful. Other countries have embellished the metric system by introducing non-metric unit such as the kgf and the bar. In my opinion, it has been an unsuccessful marriage.

Industry, again in my opinion, is to blame. It has not taken the lead. The various codes have also avoided taking this bold step.

It is interesting to note, one of the very few countries to use the S.I. Metric system is South Africa. It is legislated. It is completely consistent. It is in their pressure vessel regulations.