Buried Pipe Analysis

ANALYSIS OF EXTERNAL LOADS ON BURIED PIPE (Based on ALA - Guidlines for the design of Buried steel pipe)

Project

: 13404

Pipeline : 6" Jet fuel pipeline

FLOODED

1.) EARTH LOAD Total dry unit weight,

r =

NON-FLOODED

1

120

LB/FT^3

3 18.86 kN/m

Height of backfill above pipe, C =

59.06

INCH

1.50 m

unit weight of water ,

62.4

LB/FT^3

3 9.81 kN/m

59.06

INCH

1.50 m

rw =

height of water above pipe, Water buoyancy factor,

hw = Rw =

0.67

= Earth Load,Pv

(1-0.33(hw/C) rw.hw+Rw.r.C

=

4.88

=

PSI

2.) LIVE LOAD Concentrated load at the surface above pipe, Ps = offset distance from pipe to line of application of surface load d = Impact factor,

F' =

Pressure Transmitted to pipe,

Pp = =

18000

lb

0

inch

1.15 F'*3Ps/(2*π*C2[1+(d/C)2]2.5) 2.83 PSI

3.) OVALITY Pipe Outside Diameter,

D=

6.625 INCH

Bedding constant,

K (~0.1) =

0.1

thickness of pipe, thicknes of liner,

t = tL =

0.280 INCH

thicknes of coating ,

tc =

0.1063 INCH

0 INCH

Pressure on pipe due to load, P =

dy/D =

1.5

E` =

500 PSI

Youngs modulus of pipe, modulus of elasticity of liner,

E= EL =

29000000 PSI

modulus of elasticity of coating, Ec=

113000 PSI

0 PSI

7.71 PSI

Equi. pipe wall stiffness, (EI)eq = Ovality ,

Deflection lag factor, D1(~1.0 -1.5) = Modulus of sol reaction,

53016.52 (D1.K.P)/((EI)eq/R^3 + 0.061 E') 0.001 INCH 0.15%

Ovality percentage =

Check Ovality