Vessel Design

DESIGN OF VESSELS UNDER INTERNAL PRESSURE (PIN > POUT)

DESIGN OF SHELL

1. Design of Spherical Vessels:

2. Design of Cylindrical Vessels:

DESIGN OF HEADS

Hemispherical Head:

Elliptical Head:

Dished Head:

Flat Head:

Conical Bottom:

CE

DPt

all

ishd

c

cos**2

*

If α ≤ 30° Compression ring

If 30° < α ≤ 75° Intermediate Part

α > 75°

SHEET 1

When will we finish this long

section!!!!!!

1. A horizontal storage tank, 250 cm long and 70 cm inside diameter, is used to store liquefied butagas at 15 bar and 60ºC. The tank is fabricated from Carbon Steel with allowable tensile strength of 1,000 Kg/cm2. Calculate the thickness of the shell and that of the head in the following cases:Elliptical head.Torispherical head.Hemispherical head.

2. Determine the maximum operating pressure for each of the following vessels:

i. A spherical vessel having an internal diameter of 1.6 m and 5.0 mm thickness (σall = 1,100 Kg/cm2).

ii. A cylindrical tank having an internal diameter of 1.5 m, 4.0 mm thickness and a dished head with thickness of 3.0 mm .(r/R = 0.1 and σall = 1,300 Kg/cm2).

3. A spray dryer of 1.0 m inside diameter is to be fabricated from mild steel (σall = 1000 Kg/cm2). Conical bottom with a height of 1.1 m is to be fabricated. The shell is 3 m in length. The drier is to be designed under 1.3 atm.g.

Calculate:

i-Thickness of the shell.

ii-Thickness of the conical bottom.

iii-Thickness of the top head (Dished head).