Abstract

The design of bolted flange joints according to the ASME BPVC uses the Taylor Forge method, first published in 1949. This method uses geometric factors (F, V and f for integral flanges and FL and VL for loose flanges) in the calculation of stresses in a tapered hub flange. The ASME BPVC, Section VIII, Division 1 provides charts and equations that can be used to calculate the factors. The charts are provided over a range of hub thickness ratios (g1/g0) from 1 to 5, and for hub length parameters (h/h0) between 0 and 2. Section VIII, Division 2 uses the same factors, but provides a different set of equations to calculate the factors. Within the parameter ranges of the Division 1 charts, the Division 1 and Division 2 equations give essentially the same results, but the methods diverge for parameters outside the chart ranges. This paper will describe the origin of the geometric factor curves and problems that arise when using the Division 1 and Division 2 flange design factor equations outside the parameter ranges of the Division 1 charts. New equations for the flange design factors that are valid over extended parameter ranges were derived from the original closed-form solution of the tapered hub flange and are proposed as an improvement to the current equations used in ASME Section VIII, Division 1 and Division 2.

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