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Phosphoric Acid Plant Design

This document provides calculations to check the mechanical design of a top plate for a phosphoric acid plant. It calculates the required and provided plate thicknesses accounting for corrosion. Loads on the plate are calculated, including self-weight, live load, nozzle weight, agitator weight, and additional load. The maximum stresses and deflection are calculated using Roark's formulas and compared to allowable values based on the material properties. The results indicate the design is acceptable with stresses and deflection below allowable limits.

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ABIDEEN BAMNE
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445 views1 page

Phosphoric Acid Plant Design

This document provides calculations to check the mechanical design of a top plate for a phosphoric acid plant. It calculates the required and provided plate thicknesses accounting for corrosion. Loads on the plate are calculated, including self-weight, live load, nozzle weight, agitator weight, and additional load. The maximum stresses and deflection are calculated using Roark's formulas and compared to allowable values based on the material properties. The results indicate the design is acceptable with stresses and deflection below allowable limits.

Uploaded by

ABIDEEN BAMNE
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Phosphoric Acid Plant TITLE - Mechanical Design Calculation Rev.

TOP PLATE CALCULATION

Corrosion allowance Ca 1.60 mm


Minimum required thickness tmin 5.00 mm
Hence, Required thickness t 6.60 mm
(tmin + Ca)
Provided thickness (corroded) 8.40 mm
Provided thickness 10.00 mm
Material of plate IS 2062 E250 B
2
Yield Strength of material 250 Mpa 2549.25 Kg/cm
2
Resisting downward force due to self wt. 65.94 Kg/m
2
Resisting downward force due to live load 102 Kg/m
2
Agitator Weight 950 Kg 193 Kg/m

Outer diameter Do 2502 mm


Stiffener section Provided 2 vertical + 2 Horizontal N 4.00 Nos.
Max. spacing between two stiffener b 0.925 m
Max. length of unsupported span a 0.925 m
Self weight of Plate p1 65.94 Kg/m2
Live load p2 102.00 Kg/m2
Nozzle & misc. Weight 300 Kg p3 61.02 Kg/m2
Agitator Weight p4 193.22 Kg/m2
Additional load p5 1000.00 Kg/m2
Total load q 1422.18 Kg/m2
Ratio a/b 1.00

As per Roarks Formula (Table 11.4 formulas for flate Plates)


2
Stress at edge Tde= β1*q*b^2/t^2 530.82 Kg/cm
2
Stress at centre Tdc= β2*q*b^2/t^2 239.02 Kg/cm

Allowable stress 0.66xYs σ 1698 Kg/cm2


Allowable stress is greater than induced stress,
Hence Design is O.K
Deflection, Tyd= α*q*b^4/E*t^3 1.19 mm
Where, β1= 0.308 β2= 0.139 α= 0.0138
young modulus 199000 Mpa E= 20292352.64 T/m2

Allowable deflection Y= t/2 4.20 mm

Allowable deflection is greater than actual deflection,


Hence Design is O.K

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