Can Japanese standards be used for pressure vessel pipe flanges?

In the Chinese mainland, the design, manufacture, and use of pressure vessels generally must comply with **standards or industry standards. For the pipe flanges of pressure vessels, the Chinese chemical industry standard HG/T 20592 \"Steel Pipe Flanges (PN Series)\\" is commonly used. This standard is widely used in industries such as chemicals and petroleum within the country. 1. Whether flanges conforming to the Japanese JIS standard can be used depends on the design requirements of the pressure vessel, the operating conditions, and what is permitted by relevant domestic regulations and standards. Under certain specific circumstances, if domestic standards are recognized alongside international standards, or if the industry in which the product is used permits the use of international standards, then JIS-standard flanges may be used. But in most cases, especially for equipment in areas of critical importance to safety, the use of **standards** is recommended or required. 2. As for whether there are relevant documents supporting the use of flanges that comply with the JIS standard, this usually requires consulting **relevant laws and regulations, industry standards, or the technical specifications of the specific project. This includes, but is not limited to, the regulations set by the Quality and Technical Supervision Bureau and the General Administration of Work Safety, as well as possible **standards (GB), industry standards (HB, JB, etc.), and enterprise standards. Before deciding whether to use flanges according to the JIS standard, it is necessary to consult engineers, designers, or the local quality and technical supervision authorities. In certain special circumstances, when flanges that serve as substitutes for those conforming to the HG/T 20592 standard are required, it may be necessary to evaluate whether they offer an equivalent level of safety. Appropriate approval procedures may also be required to ensure that the safety performance of these substitutes is comparable to that stipulated in the HG/T 20592 standard. In the absence of specific industry permits or clear regulations, using components that do not meet domestic standards may carry high risks. Therefore, before making a decision, it is essential to ensure that all replacements are carried out in compliance with relevant laws and regulations as well as safety standards, and that they have received approval from all relevant regulatory authorities. .

Using the Japanese standard for this is perfectly fine; generally, pipe flanges are manufactured according to the customer’s requirements. At present, many of our domestic customers require that the pipe flanges comply with the ASME B16.5 standard. On our drawings, we specify the American standard HG/T 20615 (which is equivalent to ASME B16.5), and no inspection body will object to this. It is recommended that you use Japanese-style flange specifications and dimensions, while employing domestic materials.

Check whether HG/T20592 and HG/T20615 can be used with Japanese flanges; if not, use non-standard flanges instead. The flange dimensions here are not a big issue; the key is that the performance parameters of Japanese materials need to be applied to containers manufactured according to domestic standards, and a technical review must also be conducted, right?

It isn’t a problem which country’s standards to adopt; in some of the earliest ethylene and synthetic ammonia projects introduced in China, JIS standards were basically used. As long as the requirements for strict standard implementation are met and the substitution standards for JIS-standard flanges are accurate, there will be no problems.

Japanese flange standards, represented by JIS B 2238—1996 \"General Rules for Steel Pipe Flanges\", have pressure ratings of 2K, 5K, 10K, 16K, 20K, 30K, 40K, and 63K. Their dimensions form their own series and are not interchangeable with those of other flange standards. Japanese flanges are characterized by their small size and correspondingly low weight, which is why they are mainly used in utility applications. The internationally accepted standards for pipe flanges can be summarized as two distinct, non-interchangeable systems: one is the European pipe flange system represented by Germany; the other is the American pipe flange system represented by the United States. The Japanese flange system is a niche one; the world over, as well as in China, Europe and the Americas still have dominant systems.

Firstly, Japanese-standard flanges cannot be used directly; if compatibility is required, separate drawings and calculations must be prepared, with technical requirements following HG20592

20615 is basically formulated in accordance with ASME B16.5; the differences are minor. Japanese standards are rarely used these days, I guess