Saddle supports design

Procedures for the design of saddle supports are given by Brownell and Young (1959), Megyesy (2001), Escoe (1994) and Moss (2003). 

The method used to support a vessel will depend on the size, shape, and weight of the vessel the design temperature and pressure the vessel location and arrangement and the internal and external fittings and attachments. Horizontal vessels are usually mounted on two saddle supports see Figure 13.20. Skirt supports are used for tall, vertical columns see Figure 13.21. Brackets, or lugs, are used for all types of vessels ... 

There are 14 main stresses to be considered in the design of a horizontal vessel on saddle supports ... 

Moody, G. B., How to Design Saddle Supports, Hydrocarbon Processing, November 1972. 

Procedure 3-11 Design of Saddle Supports for Large Vessels, 177... 

DESIGN OF HORIZONTAL VESSELS WITH SADDLE SUPPORTS... 

Design of Horizontoi Vessels with Saddle Supports... 

Zick, L. F., Stresses in Large Horizontal Cylindrical Pressure Vessels on Two Saddle Supports in Pressure Vessel and Piping Design, Collected Papers 1927-1959, American Society of Mechanical Engineers, New York, 1960. 

Spheres, spheroids, and toroids use steel or concrete saddles or are suppoi ted by columns. Some may rest directly on soil. Horizontal cyhndrical tanks should have two rather than multiple saddles to avoid indeterminate load distribution. Small horizontal tanks are sometimes supported by legs. Most tanks must be designed to resist the reactions of the saddles or legs, and they may require reinforcing. Neglect of this can cause collapse. Tanks without stiffeners usually need to make contact with the saddles on at least 2.1 rad (120°) of their circumference. An elevated steel tank may have either a circle of steel columns or a large central steel standpipe. Concrete tanks usually have concrete columns. Tanks are often supported by buildings. 

The metallic catalyst support can be in form of chips, open-mesh and reinforced wire structures, and staggered layers of metal screens or saddles. In one design, screens woven from metallic wires 0.01 to 0.03 in. diam are placed in a deep stack. In another design, metal foils 0.004 in. thick are perforated and expanded to form a screen, which is then rolled into a cylinder. See Fig. 12. 

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