Steel Pipeline Crossing Highways(Ect)Metric

8/12/2019 Steel Pipeline Crossing Highways(Ect)Metric

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Pipe and operational characteristics values units

Outside diameter D 9.625 in

Operating Pressure p 2800 psi

Pressure Test 305 psi

Steel Grade X65

Specific Minimum Yield Strength SMYS 65000 psi

Design Factor F 0.8

Longitudinal Joint Factor E 1Installation Temperature T 41 F

Maximum or minimum operating Temperature T 68 F

Temperature derating Factor T 0

Wall Thickness tw 0.27992126 in

Installation and Site Characteristics

Depth H 4.92 ft

Bored Diameter Bd 9.60629921 in

Soil Type loose sand

Modulos of Soil Reaction E' 0.15 ksiResilient Modulos Er 1.5 ksi

Unit Weight 124.855947 lb/ft3

0.0722546

Angle of Internal Friction 36

Cohesion Co

Coeffient of Lateral Earth Pressure Ko 0.41

Adhesion Factor 1.01

type of longitudinal wield saw

Design Wheel Load from single axle Ps 7.5 kips

Design Wheel Load from tandem axle Pt 7 kipsPavement Type flexible

Other Steel Properties

Youngs Modulus Es 10 ksi

Poissons Ratio vs 0.3

Coeffiecient of thermal expansion T 0.0000065 /f

Transversal Fatigue Stress Limit SFG 12 ksi

Longitudinal Fatigue Stress Limit SFL 12 ksi

Seismic

Maximum Magnitude (Richter) M 8.5

Hypocentral Distance DH

Apparent Velocity of Seismic Wave Cs

Wave Ratio 2

Apparent Seismic Wavelength

Earthquake Maximum Speed V


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Step 1

Check allowable Barlow Stress

pD/2twF*E*T*SMYS

pD/2tw= 48138.53727 psi

FETSmys 52000 psi

Step 2 Circumferential Stress Due to Earth Load

using tables to obtain

KHe 1339

figure 3 use

tw/D= 0.03

E= 0.15

Bc 1

figure 4 use

H/Bd = 6.1

soil type loose sand

Ee 1

figure 5 use

Bd/D= 1

She =KHeBeEeD= 931.2082429 psi

Step 3 Impact Factor, Fi, and Applied Design Surface Pressure, w

Fi 1.5

Use Figure 7 for highways

H= 4.92

refer to section 4.7.2.2.1

w=P/Ap 48.61111111 psi

Ap= contact area over load is applied = 144 in

Sttep 4 Cyclic Stress

Cyclic Circumferential Stress

SHh = KHhGHhRLFiw 1022.048125 psi

KHh 10.157


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figure 14 use

tw/D 0.03

Er 1.5

GHh 1.38

figure 15 use

D 9.625

H 4.92

Cyclic Longitudinal Stress

SLh = KLhGLhRLFiw 838.4473854 psi

KLh 8.231

Figure 16 use

tw/D 0.03

Er 1.5

GLh 1.27

figure 17 use

D 9.625

H 4.92

R 1.1

L 1

Table 2 with

flexible pavement and TANDEM AXLE

H= 4.92

D= 9.625

Step 5

Circumferential Stress Due to Internal Pressurization, SHi

SHi=p(D-tw)/2tw 45338.53727 psi

Step 6

Principal Stresses, S1,S2,S3

T 41 F

T 68 F

Es 10

vs 0.3

T 0.0000065


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S1=SHe+SH+SHi 47108.1929 psi

S2=SLH-EsT(T2-T1)+vs(SHe+SHi) 14719.36928 psi

S3=-p -2800 psi

Seff=[0,5((S1-S2)2+(S2-S3)2+(S3-S1)2]

0,543856.53836 psi

Allowable Effective Stress = F x SMYS 52000 psi

Step 7

Check Fatigue

Girth WeldsFrom table 3 use

SLh = 838.4473854 psi

SFG= 12000

F= 0.8

SFGx F= 9600 psi

Longitudinal Welds

From Table 3

SHh= 1022.048125

SFL= 12000F= 0.8

SFL x F= 9600 psi


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331.903517

358.527364

0.02908273

6.42045455

7.04677346

0.07003005


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5.78089098

312.598197


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324.799543

101.486474

-19.3053196

302.380175


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Depth of burial, H


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AND H4FT FOR ALL DIAMETERS

ps(44.5kN)


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Pipe and operational characteristics values units

Outside diameter D 9.625 in

Operating Pressure p 19.3 MPa

Steel Grade X65

Specific Minimum Yield Strength SMYS 448 MPa

Design Factor F 0.8

Longitudinal Joint Factor E 1

Installationn Temperature T 5 CMaximum or minimum operating Temperature T 20 C

Temperature derating Factor T 0

Wall Thickness tw 7.11 mm

Installation and Site Characteristics

Depth H 1.5 m

Bored Diameter Bd 0.244 in

Soil Type loose sand

Modulos of Soil Reaction E' 1 MPa

Resilient Modulos Er 10 MPaUnit Weight 2000 kg/m

3

type of longitudinal wield saw

Design Wheel Load from single axle Ps 53.4 Mpa

Design Wheel Load from tandem axle Pt 48.8 Mpa

Pavement Type flexible

Other Steel Properties

Youngs Modulus Es 70 ksi

Poissons Ratio vs 0.3

Coeffiecient of thermal expansion T 0.0000117 /C

Allowable Barlow Stress

Shi FxExTxSMYS or FxExSMYS

SHi= 332 MPa ok

FxExSMYS= 358.5 MPa

Allowable Effective Stress

Seff SMYS x F

Seff= 302.5 MPa ok

SMYS x F = 358.5 MPa

Fatigue

Girth Welds

SLH SFG x F

SLH= 6 MPa ok

SFG x F= 66 MPa


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Longitudinal Welds

SHh SFL x F

SHh= 7 MPa ok

SFL x F = 66 MPa


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Steel Pipeline Crossing Highways(Ect)Metric

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