Chemical industry standard HG20615 imposes restrictions on the use of socket flanges; then why are there no such restrictions on socket fittings?
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The use of SO socket weld flanges in Ministry of Chemical Industry standard HG 20615 is subject to certain restrictions, including low pressure limits, size constraints, and a prohibition on their use with flammable or explosive media. Thus, the pressure that can be handled by socket weld pipe fittings can reach 9,000 pounds, and there seems to be no limitation regarding the medium used. Why is this?
SO flanges can only be used in 150# and 300#