Question regarding the welded branch pipe platform
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MSS SP 97 2012 Tbale1 states that the pressure class of the branch fitting is determined by the wall thickness of the main pipe； The BONNEY FORGE sample states that when the wall thickness grades of the main pipe and the branch pipes are different, it is necessary to specify the wall thickness grades for both. The wall thickness of the main pipe is used to determine the pressure class Basis for the branch pipe, while the wall thickness of the branch pipe side walls is the same as that of the main pipe. So the question arises: the MSS SP 97 welded branch fittings are available in three pressure classes – STD, XS, and SCH160. As long as the main pipe is larger than DN300 and its wall thickness is greater than SCH60, it should be classified as SCH160. Is this requirement too strict? Moreover, SCH160 is only available up to DN600 in ASME B36.10M; it cannot be used for main pipes larger than 600. Dear friends and colleagues, in chemical engineering design, how do you represent weld branch supports? ? 1) Main pipe dimensions and wall thickness + branch pipe dimensions and wall thickness – no consideration at all for MSS SP-97 regarding pressure classes? 2) Main pipe size + branch pipe size and wall thickness – MSS SP-97 is not taken into consideration at all regarding pressure class? Does the manufacturer select the branch pipe base according to the wall thickness of the branch pipe? 3) Determine the pressure class in MSS SP97 based on the main pipe wall thickness, STD XS SCH160, and then provide the main pipe dimensions + branch pipe dimensions and wall thickness? 4) Determine the pressure class in MSS SP97 based on the branch pipe wall thickness, STD XS SCH160, and then provide the main pipe dimensions + branch pipe dimensions and wall thickness? Those who are aware of this could please help explain what the best way to do it is. Thank you @!
3) Determine the pressure class in MSS SP97 based on the main pipe wall thickness, STD XS SCH160, and then provide the main pipe dimensions + branch pipe dimensions and wall thickness?
I need to correct one of your statements: that is a wall thickness grade, not a pressure grade. The different wall thickness grades for the main pipe and the branch pipes indicate that there is a pipe diameter for which no corresponding wall thickness grade exists, so a higher grade was chosen. There is a simplest solution to this issue: the SCH calculated, that is, the lower-level SCH, should be used to determine the SCH for the branch manifold, with the highest value among the three being chosen. If you think the selected size is too large, there is a rather complicated solution: calculate the wall thickness of the branch pipe directly to obtain a specific value instead of using SCH, and then order the product with that specific wall thickness.