10-04-2017, 08:06 PM
saddle support design spreadsheet
ABSTRACT
In order to investigate the impact of different geometrical parameters like number of gussets, and gusset thickness, on the design of saddle support, the horizontal pressure vessel is designed and analyzed by Finite Element Method. The saddle support of the horizontal pressure vessel is designed as per Handbook of the Pressure Vessel by Megyesy. The solid model of pressure vessel with realistic details of two saddle supports is analyzed by using FEA software package ANSYS APDL.
The purpose of this paper is to optimize the geometrical parameters of the saddle and to find whether saddle support can sustain the horizontal pressure vessel under loading conditions. We found 28 % reduction in material requirement which results reduction in costs.
INTRODUCTION
The design of horizontal cylindrical vessels with dished heads to resist internal pressure is covered by existing codes. However, the method of support is left pretty much up to the designer. In general the cylindrical shell is made a uniform thickness which is determined by the maximum circumferential stress due to the internal pressure. Since the longitudinal stress is only one-half of this circumferential stress, these vessels have available a beam strength which makes the two-saddle support system ideal for a wide range of proportions. However, certain limitations are necessary to make designs consistent with the intent of the code. The purpose of this paper is to indicate the approximate stresses that exist in cylindrical vessels supported on two saddles at various locations. Knowing these stresses, it is possible to determine which vessels may be designed for internal pressure alone, and to design structurally adequate and economical stiffening for the vessels which require it. Formulas are developed to cover various conditions, and a chart is given which covers support designs for pressure
vessels made of mild steel for storage of liquid weighing 42 lb. per cu. ft.