2012-02-28_REVISION - M1980244 ‎(70)‎

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 2/28/2012
• Doc Name: VOL 5, Appendix C: Design Calculations
• From: CC&V
• To: DRMS
• Type & Sequence: AM10
• Email Name: TC1
• Media Type: D
• Archive: No

'PROJECT:
wow Gulch VLF
ATURE:
Riser Pipe Design
DETAILS:
Pipe Collapse Strength and Shear Traction Stress
Collapse Strength (Timoshenko's Formula):
Per = [( /( * (1/[(0,/t) -1])
E = 3 x 10 psi (Modulus of Elasticity) - Assumed typical
y = 0.3 ( ) - Assumed typical
0, = Outer diameter = 24"
t = wall thickness = 0.375"
P _ [(2 * (3 x 107) /[1- 0.32]) * (1/[(24/.375) -1])
P = 263.7 psi : 37,973 psf
Maximum lateral stress = 5,723,3 psf
F05 = 37,973 psf / 5,723.3psf = 6.63
Shear Traction Stress Calculation:
T = a,tan.
a = Average Lateral Stress = 2,861.7 psf
T = (2,861.7 psf) * tan(17°) = 874.9 psf
Convert Shear Traction Stress to Shear Stress:
Shear force = c * area
area = 2id * L = 2ir * (2/2) * 110 ft = 691.2 ft
Shear force = 874.9 psf * 691.2 ft = 604,731 lbs
JOB NO:
11256
BY:
OV
CHKD BY:
DTW
O.D. = 24"
I.D. = 23 1/4"
Wall = 3/8" = 0.375"
Carbon Steel A53
SHEET,A_OF_/
DATE:
08/03/2010
DATE:
08/03/2010