Vessel DesignDesign of Horizontal & Short Vertical Vessels
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A Real Tall Vertical Vessel
Sheet 5: 2 Problems
Design of Short Vertical Vessels (L < 6m)
Sheet 5: 2 Problems
In designing short vessels, we firstly calculate the
thickness of shell and heads according to the
operating pressure [i.e. internal or external]. In this
case we will not do checks on the thickness as done
in tall vessels so, we will design the support directly.
Lug SupportThe use of lugs is typically limited to vessels of small to medium diameter (1 to 10 ft.) and moderate height-to-diameter ratios in the range of 2:1 to 5:1.
And of Course Sheet5: 2 problems
Design of Lug support:
After calculating fs, you should select the dimension of pipe (lug) and check on your selected dimensions [i.e. check if the lug supports will withstand the load applied on it]. Following are the steps used to select the suitable pipe dimensions:
1. From the following table, assume nominal diameter to get the inside and
outside diameter of the pipe. Begin your assumption with nominal
diameter = 2" [always take the Schedule number = 80].
Sheet5 : 2 Problems
Sheet 5: 2
Problems
2. Calculate the radius of gyration (r) from the following
equation:
3. Calculate the value of h’/r.
4. Make the check on the selected pipe dimensions
according to the value of h’/r . Those values are
summarized in the following table:
rh' 60'
rh 200'60
rh 200'
rh
The Check
Relation pipeallpipe
s
Af
2
.
.
'*11
rhA
f
pipe
pipe
all
all
pipe
s
..min
.min'2
'**
*5
cal
critical
scritical
IIhIEF
fF
5. If the corresponding check is not correct, assume another nominal
diameter [greater than 2"] and repeat the above steps.
Assume:
Design of Bearing Plate:
In order to check on this assumption, use the following formula:
Design of Anchor Bolts:
If σtension) max = - ve value: the number of bolts equal 4 used for fixation.
If σtension) max = + ve value: the number of bolts calculated from the
following equation:
Design of Horizontal Vessels
Hello !?I just want to
tell u that sheet5 : 2 problems
Design of Saddle Support: or
Design of Horizontal Vessels
Sheet5: 2 Problems
In Mass Transfer?
!
Assume:I’ll go to the section now .
I don’t know which subject but they told
me that Sheet5: 2 Problems
Design of Bearing Plate:Assume:
Design of Anchor Bolts: only 4 bolts for fixation
Sheet5: 2 problems?
Yes
Sheet 5
1. A pressurized vessel lined internally with 4 mm Nickel material is to be fabricated and installed out of doors in Mostorod area. The vessel has the following specifications:
Shell inside diameter 1.5 mShell length 4 mMaximum internal pressure 20 atm.gageOperating temperature 150ºCLug support height 2 m No. of lugs 6 Corrosion allowance 1 / 16 in.Insulation thickness 2 in.Shell material C.steelAllowable tensile strength of material of construction 15000 psiHead type Dished Specify the design for:- Shell & heads.- Lug support, bearing plate & anchor bolts.- Maximum permissible vacuum applied in the vessel.
2. A process horizontal vessel is to be fabricated and installed out of doors. The vessel has the following specifications:
Shell inside diameter 1.1 mShell length 2.1 mMaximum internal pressure 10 barDistance between two supports 1.25 mOperating temperature 150ºCSupport height 1 mFluid Heavy hydrocarbonCorrosion allowance 3 mmInsulation thickness 50 mmShell material Carbon steelAllowable tensile stength of material of construction 1000 kg/cm2
Type of heads DishedSpecify the design for:- Shell & heads.- Support, bearing plate and anchor bolts.