Can national standard valves be manufactured according to API602?
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As stated in the title, the valve model specified by the design institute is Z41Y-25P DN15; the standard indicated is API602 with a pressure rating of 2.5 Mpa. Isn’t this a valve that follows national standards? Can it be manufactured using American standard specifications?
Don’t get stuck on the standard questions – why can’t it be done? What does it matter if the connection dimensions match? Don’t make technical issues too academic. A common problem in design institutes and universities in China.
At the end of the 1990s, Chuanhua Group launched a project to produce urea. During pipeline installation at that time, the structural length of the valve was increased by 10 MM; small-diameter valves are connected by butt welding. It’s not possible to install the valve on site, and it’s difficult to weld it. Damn, it took 4 meetings to solve this problem. For such a simple question, two days of meetings were held – the Chinese have too much free time. Dogma kills people.
API602 does not include the pressure class of PN2.5; it is therefore not possible to comply with this standard. In other words, this class is not specified in standards related to temperature and pressure curves or valve wall thicknesses. So what should manufacturers do? It is best to follow the relevant national standards.
API602 specifies that for valve bodies with a capacity of 800LB, PN25 is sufficient for the flanges and structural length; this is the standard practice.