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

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.

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rhA

f

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pipe

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all

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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

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tell u that sheet5 : 2 problems

Design of Saddle Support: or

Design of Horizontal Vessels

Sheet5: 2 Problems

In Mass Transfer?

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me that Sheet5: 2 Problems

Design of Bearing Plate:Assume:

Design of Anchor Bolts: only 4 bolts for fixation

Sheet5: 2 problems?

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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.