{"id":5885,"date":"2017-02-01T12:10:11","date_gmt":"2017-02-01T12:10:11","guid":{"rendered":"http:\/\/arvengconsulting.com\/non-standard-flanges-asme-viii\/"},"modified":"2022-01-14T12:14:47","modified_gmt":"2022-01-14T11:14:47","slug":"non-standard-flanges-asme-viii","status":"publish","type":"post","link":"https:\/\/arvengtraining.com\/en\/non-standard-flanges-asme-viii\/","title":{"rendered":"Non-standard flanges – ASME VIII"},"content":{"rendered":"

Non-standard flanges will only be used in cases where pressure, temperature and size requirements exceed the capabilities of standard flanges.<\/strong> Keep in mind that non-standard flanges require calculation, design and special manufacturing procedures, which is why they are chosen only as a last resort. The most common such applications are large equipment flanges and heat exchangers body flanges.<\/p>\n

Non-standard flanges are designed and calculated according to ASME VIII Div.1 Appendix 2 and Appendix S, and according to ASME VIII Div.2 part 4.16.<\/strong><\/p>\n

Design criteria<\/h4>\n

Rules for the design of bolted flange connections as described in Div.1 Appendix 2 apply to flanges with gaskets placed entirely within the circle enclosed by the bolt holes and with no contact outside this circle.<\/p>\n

This method is applicable to circular flanges under internal pressure and takes into account only hydrostatic end loads and gasket seating loads.<\/strong> Rules have been further modified so that they can be applied to the design of flanges under external pressure, reverse flanges and flanges with nut stops.<\/p>\n

Design procedure for large diameter, low pressure flanges shall be supplemented by methods other than the code e.g.: check flange rotation. Flanges greater than 60 inches (1524 millimeters) inside diameter and designed for up to 100 psig (689 KPa) pressure fall under this category.<\/p>\n

Design of flanges involves the selection of the following:<\/p>\n