Back in the 70's or 80's the Chinese Government invited member of the National Board for an undetermined amount of time to their country. I don't have the itinerary and the subjects covered during that visit, however, I suspect that the Chinese Government was interested in the NB Unfired and Fired Pressure Vessel Codes, so I would not be surprised if the Chinese Unfired and Fired Pressure Vessel Codes were similar to that of the NB's.