Process Area Activity – [I See Now-47]: Flanges are classified by Class and PN

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Let me tell you about something that happened a few years ago. Since the pipeline standards used in the company’s projects were all ASME standards, and these standards were applied in construction, everyone was only familiar with ASME and API standards for flanges; they had no idea that there was also a PN standard. At that time, the company needed to install new equipment, and the Equipment Department was responsible for it. It was necessary to fabricate flanges that matched the valves (PN series), as purchasing such flanges would take too much time. An engineer from the Equipment Department was being lazy; hearing that we had a Pipedata software, he wanted to use it. I said the content didn’t match, but he insisted, so I gave it to him. Later, when it turned out that it wasn’t actually needed, I asked the senior colleague in my office (who had experience in the chemical industry) for the dimensional information of this flange. The older sister said kindly, “PN16 corresponds to the size of ClassXX (I can’t remember it); you can use that as a reference.” ” Then this guy, being extremely lazy, simply found the corresponding class level on Pipedata, specified the dimensions, and submitted it to the external manufacturer for production. It was finished in a few days, and when I brought it back to try to install it, it wouldn’t fit. So this guy called my colleague in the office (in a somewhat accusatory tone) and asked, \"Weren’t you saying that PN16 is equivalent to Class XX?\" Why can’t I connect it on the spot? ”I don’t know how the older sister replied. In the end, that equipment engineer must have been criticized by his supervisors, as the company’s management was also paying close attention to the installation and testing of that equipment. Before long, he either resigned or was fired; in any case, no one saw him again.