SADDLE SUPPORT DEFINITION A saddle support is a

SADDLE SUPPORT

DEFINITION �A saddle support is a support consisting of a stanchion that utilizes a curved section for cradling the pipe.

SELECTION OF SUPPORT �Supports for The vertical pressure vessels units are supported generally by : i)SKIRT SUPPORT , ii)BRACKET SUPPORT, iii)RING SUPPORT � The horizontal pressure vessels are supported by : i). saddle supports, ii). leg supports

SUPPORT IN HORIZONTAL CYLINDRICAL VESSELS �In general horizontal cylindrical vessels resistant to temperature and internal pressure are designed according to standards and international codes design, which often. Hresult in pressure vessels with wall thicknesses uniforms, which are governed by the calculation of circumferential stress.

SADDLE SUPPORTS CALCULATIONS PROCEDURES �The saddle design depend on two main forces : � 1 - the horizontal force � 2 - the total load force acting on the saddle �The total force per saddle calculated from three forces : A- the weight of the vessel B- the tangential forces C- the longitudinal forces

TYPE OF STRESS ACTING ON SADDLE � 1– Longitudinal stress � 2– Tangential stress � 3– Circumferential stress

� Longitudinal stress at top of the shell: - σ1= P*R/2*t – M 1/π*R*t � Longitudinal stress at the bottom of the shell: σ2= P*R/2*t + M 2/π*R*t � Longitudinal stress at top of Shell at supports: σ= P*R/2*t – M/π*R*t � Longitudinal stress at the bottom of the shell at support : - σ= P*R/2*t + M/π*R*t Where, R = radius of the pressure vessel. t = thickness of shell, mm. . σ1, σ2 = Longitudinal stresses in the shell at top and bottom of mid- span, kgf/cm 2. . M 1 = Maximum longitudinal bending moment at the saddle, N-m or kgf-m. M 2 = Maximum longitudinal bending moment between the saddle supports, N-m or kgf-m

Fabrication of Saddles �Fabrication of Saddles Inclined and Straight Types : This section explains how the saddles were fabricated and tested The saddle consists of a base plate, web plate, two ribs and a wear plate in top.

FABRICATION OF STRAIGHT SADDLE AND INCLINED SADDLE Figure 1 ribs plates of inclined saddle Figure 2 web plates of straight and inclined saddle

Figure 3 wear plates before rolling Figure 4 wear plates after rolling

Figure 5 grooving of plates in vertical milling machine Figure 6 fabricated saddle