Scribd
Upload
453 views2 pages

Calculation of Davit

The document summarizes the calculation of stresses on a davit used for lifting a 1963 lb weight. It provides the material properties, dimensions, and loading conditions used in the calculation. The maximum tensile stresses in the lifting and vertical directions were found to be 0.9 psi and 0.2 psi, both less than the allowable stresses, showing the davit meets the requirements.

Uploaded by

piziyu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
453 views2 pages

Calculation of Davit

The document summarizes the calculation of stresses on a davit used for lifting a 1963 lb weight. It provides the material properties, dimensions, and loading conditions used in the calculation. The maximum tensile stresses in the lifting and vertical directions were found to be 0.9 psi and 0.2 psi, both less than the allowable stresses, showing the davit meets the requirements.

Uploaded by

piziyu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
You are on page 1/ 2

CALCULATION OF DAVIT

Data Summary
Lifting lug material SA-106 B
Design Temperature T = 70 F
Minima Yield Strength Sy = 35,000 psi
Allowable stresstensile [t] = 21,000 psi
Allowable stressbending [b] = 23,100 psi
Lifting weight W = 1963 lb
Pipe out diameter D = 3.5 in
Pipe thickness t = 0.438 in
Arm radius R = 12 in
Arm length L1 = 28.324 in
Pipe length L2 = 14.75 in
Support point distance L3 = 15 in
Impact factor Kd = 1.1
Coefficient =4tR/D 2 = 1.716245
Coefficient =6/(5+62) = 0.264632
Coefficient K=(122+1)/(122+10) = 0.801526

Calculation Steps
(a) Load on one lifting direction :
fa=4KdW/D2 = 224.4 psi
(b) Vertical load :
fb1=32KdDWL1/(D4-(D-2t)4) = 21,240.2 psi
(c) Horizontal load :
fb2=64KdWL1(L2-R)D/3KL2(D4-(D-2t)4)(3)0.5 = 3,696.7 psi
(d) Maximal tensile stress on lifting direction :
fa/[t]+fb1/[b] = 0.9 psi < 1
fa/[t]+fb2/[b] = 0.2 psi < 1

Results.
Since the step (d) is OK,
THE DAVIT MEETS THE REQUIREMENTS.
Safe!
Safe!

You might also like