Standards for the dimensions of fiberglass reinforced plastic pipe fittings

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Regarding the size standards for fiberglass-reinforced plastic pipes and fittings, I have the following questions: 1. HG21633-1991 covers the sizes of pipes and fittings, but it seems to be quite outdated; are there any newer standards? Some people on the Internet say that this standard is not widely used in the industry; is that true? 2. For JC552-1994, what is the corresponding standard for pipe fitting dimensions? 3. Apart from the specific dimensional standards for fiberglass-reinforced plastic, can the manufacturer produce the products according to the dimensions specified by the client? If so, will the cost increase significantly? For example, if the client requires that the outer diameter of pipes and fittings follow the standards for steel pipes, while the thickness should be based on the standards for fiberglass-reinforced plastic pipes. I hope I can get some guidance from colleagues in the industry; thank you.