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Carlon External Load Calculation for Buried Conduit User Manual

Page 7

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EXTERNAL LOAD CALCULATIONS FOR DIRECT BURIED CONDUIT

25701 Science Park Drive

Cleveland, Ohio 44122

216-464-3400

1-800-3CARLON (322-7566)

www.carlon.com

3.

CALCULATE THE PIPE STIFFNESS (PS)

PS = E*I/(0.149*r

3

) = [150,000 lb/in

2

*0.003 in

3

]/[0.149*(2.084 in)

3

] = 337.7 in

2

4.

CALCULATE THE MAXIMUM LOAD FOR 5% DEFLECTION (W)

W = [

X*(0.149*PS + 0.061*E

1

)]/(D*K) = [0.05*(0.149*333.7 lb/in

2

+0.061*1000

lb/in

2

)]/(1.5*0.1) = 36.9 lb/in

2

5.

CALCULATE THE DEAD LOAD (DL)

DL = γγγγ * H/144 = 120 lb/ft

3

*4 ft/144 = 3.33 lb/in

2

6.

DETERMINE THE LIVE LOAD (LL) USING THE TABLE

LL = 2.78 lb/in

2

7.

CALCULATE THE TOTAL LOAD (TL)

TL = DL + LL = 3.33 lb/in

2

+ 2.78 lb/in

2

= 6.11 lb/in

2

SINCE THE TOTAL LOAD OF 6.11 lb/in

2

IS LESS THAN THE MAXIMUM LOAD

OF 36.9 lb/in

2

THE 4” SDR 13.5 CONDUIT WOULD DEFLECT LESS THAN 5%.

DISCLAIMER:

THIS DOCUMENT IS FOR INFORMATIONAL PURPOSES ONLY. A

PROFESSIONAL ENGINEER SHALL BE RESPONSIBLE FOR ALL

SELECTIONS AND CALCULATIONS TO DETERMINE WHICH TYPE AND SIZE

OF CONDUIT OR DUCT SHALL BE USED.

Gross Automation (877) 268-3700 · www.carlonsales.com · [email protected]