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Steel Pipeline Design for Highway & Railroad Crossings

This document provides initial design information for a steel pipeline crossing a railroad, including pipe characteristics, installation details, soil properties, and stress calculations. It specifies the pipe will have an outside diameter of 12.75 inches, operate at 1000 psi, and be grade X42 steel. Stress calculations are provided for circumferential stress due to earth load, impact factors, and cyclic stress. The total effective stress is calculated to be less than the specified minimum yield strength, indicating the design is sufficient.

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eko123
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176 views53 pages

Steel Pipeline Design for Highway & Railroad Crossings

This document provides initial design information for a steel pipeline crossing a railroad, including pipe characteristics, installation details, soil properties, and stress calculations. It specifies the pipe will have an outside diameter of 12.75 inches, operate at 1000 psi, and be grade X42 steel. Stress calculations are provided for circumferential stress due to earth load, impact factors, and cyclic stress. The total effective stress is calculated to be less than the specified minimum yield strength, indicating the design is sufficient.

Uploaded by

eko123
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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Steel Pipelines Crossing Highways

Intial Design Information


Pipe and operational characteristics
Outside diameter D 12.75
Operating pressure P 1000.00
Steel grade X42
Specified minimum yield strength SYMS 42000.00
Design factor F 0.72
Longitudinal joint factor E 1
Installation temperature T1 N/A
Maximum or minimum operating temperature T2 N/A
Temperature derating factor T N/A
Wall thickness tw 0.25
Installation and site characteristics
Depth H 6.0
Bored diameter Bd 14.8
Soil type Loose sand
Modulus of soil reaction E' 0.5
Resilient modulus Er 10.0
Unit weight γ 0.069
Type of longitudinal weld ERW
Design wheel load from single axe Ps 12000
Design wheel load from tandem axles Pt 10000
Pavement Type flexible
Other pipe steel properties
Young's modulus Es 30000
Poisson's ratio ϑs 0.3
Coefficient of thermal expansion αT 6,5*10^-6
Check Allowable Barlow stress

Shi(Barlow) Shi 25,500


F*E*T*S 30240.0
Conditon Shi< allowable ? yes
Circumferential Stress Due to Earth Load
tw/D 0.02
E' 0.50
Stifness Factor Khe 3024.0
H/Bd 4.86
Soil type A
Burial Factor Be 1.09
Bd/D 1.16078431372549
Excavation factor Ee 1.11

Circumferential Stress Due to Earth Load She 3219


Impact Factor Fi and Applied Design Surface Pressure w
Impact Factor Fi 1.47
Critical case flexible

applied design surface pressure w 69.4


Cyclic Stress ∆SHh and ∆SLh
tw/D 0.019607843137255
Resilient modulus Er 10.0
highway stifness factor KHh 14.3
Outside diameter D 12.75
Depth H 6.0
Highway geromtery factor GHh 0.99
highway pavement type factor R 1
highway axle configuration factor L 1

cyclic circumferentiel stress ∆SHh 1445.19375


tw/D 0.019607843137255
Resilient modulus Er 10.0
highway stifness factor KLh 9.9

Outside diameter D 12.75


Depth H flexible
Highway geromtery factor GLh 1.01
highway pavement type factor R 1
highway axle configuration factor L 1
cyclic circumferentiel stress ∆SLh 1020.73125
Circumferential Stress Due to internal pressurization Shi

Operating pressure P 1000.00


Outside diameter D 12.75
Wall thickness tw 0.25
Circumferential Stress Due to internal pressurization Shi 25000
Principal stresses S1,S2,S3
Young'Modulus Es 30000000
Coefficient of thermal expansion αT 6,5*10^-6
Installation temperature T1 N/A
Maximum or minimum operating temperature T2 N/A
Poisson's ratio ϑs 0.3
Circumferential Stress Due to Earth Load She 3219
cyclic circumferentiel stress ∆SHh 1445.19375
Circumferential Stress Due to internal pressurization Shi 25000
Maximum circumferentiel stress S1 29664
cyclic circumferentiel stress ∆SLh 1020.73125
Maximum longitudinal stress S2 9486.36357108
Maximum Radial Stress S3 -1000.00

Total effective stress Seff 26994.2446695439


Condition Seff <= SYMS *F ? Yes
Check Fatigue
Design factor F 0.72
cyclic circumferentiel stress ∆SLh 1020.73125
Fatigue endurance Limits SFG 12000
Condition Girth welds ∆SLh <= SFG *F ? Yes
Design factor F 0.72
cyclic circumferentiel stress ∆SHh 1445.19375

Fatigue endurance Limits SFL 21000


Condition Girth welds ∆SLh <= SFG *F ? Yes
in
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Steel Pipelines Crossing Railroads
Intial Design Information
Pipe and operational characteristics
Outside diameter D 12.75 in
Operating pressure P 1000.00 psi
Steel grade X42
Specified minimum yield strength SYMS 42000.00 psi
Design factor F 0.72
Longitudinal joint factor E 1
Installation temperature T1 N/A
Maximum or minimum operating temperature T2 N/A
Temperature derating factor T N/A
Wall thickness tw 0.25 in
Installation and site characteristics
Depth H 6.0 ft
Bored diameter Bd 14.8 in
Soil type Loose sand
Modulus of soil reaction E' 0.5 ksi
Resilient modulus Er 10.0 ksi
Unit weight γ 0.069 ib/in^3
Type of longitudinal weld ERW
Distance of longitudinal weld from trach centerline LG 0 ft
Number of tracks 2
Rail loading E-80
Other pipe steel properties
Young's modulus Es 30000 ksi
Poisson's ratio ϑs 0.3
Coefficient of thermal expansion αT 6,5*10^-6 F°
Check Allowable Barlow stress
Shi(Barlow) Shi 25,500 psi
F*E*T*S 30240.0
Conditon Shi< allowable ? yes
Circumferential Stress Due to Earth Load

tw/D 0.02
E' 0.50 ksi
Stifness Factor Khe 3024.0
H/Bd 4.86
Soil type A
Burial Factor Be 1.09
Bd/D 1.16078431372549
Excavation factor Ee 1.11
Circumferential Stress Due to Earth Load She 3219 psi
Impact Factor Fi and Applied Design Surface Pressure w

Impact Factor Fi 1.72


Rail road E-80

applied design surface pressure w 13.9 psi


Cyclic Stress ∆SHh and ∆SLh
tw/D 0.01960784313725
Resilient modulus Er 10.0
highway stifness factor KHr 332
Outside diameter D 12.75 in
Depth H 6.0 fr
Highway geromtery factor GHr 0.98
Number of tracks 2
Railroad single or double factor Nh 1.11

cyclic circumferentiel stress ∆SHr 8634.3646368 psi


tw/D 0.01960784313725
Resilient modulus Er 10.0
highway stifness factor KLr 317
Outside diameter D 12.75
Depth H E-80
Highway geromtery factor GLr 0.98
Number of tracks 2
Railroad single or double factor NL 1
cyclic circumferentiel stress ∆SLr 7427.25928 psi
Circumferential Stress Due to internal pressurization Shi

Operating pressure P 1000.00 psi


Outside diameter D 12.75 in
Wall thickness tw 0.25
Circumferential Stress Due to internal pressurization Shi 25000 psi
Principal stresses S1,S2,S3
Young'Modulus Es 30000000 psi
Coefficient of thermal expansion αT 6,5*10^-6 F°
Installation temperature T1 N/A
Maximum or minimum operating temperature T2 N/A
Poisson's ratio ϑs 0.3
Circumferential Stress Due to Earth Load She 3219 psi
cyclic circumferentiel stress ∆SHr 8634.3646368 psi
Circumferential Stress Due to internal pressurization Shi 25000 psi
Maximum circumferentiel stress S1 36853 psi
cyclic circumferentiel stress ∆SLr 7427.25928 psi
Maximum longitudinal stress S2 15892.89160108 psi
Maximum Radial Stress S3 -1000.00 psi

Total effective stress Seff 32844.8009171559 psi


Condition Seff <= SYMS *F ? No
Steel Pipelines Crossing Railroads
(Revised Wall thickness)
Intial Design Information
Pipe and operational characteristics
Outside diameter D 12.75 in
Operating pressure P 1000.00 psi
Steel grade X42
Specified minimum yield strength SYMS 42000.00 psi
Design factor F 0.72
Longitudinal joint factor E 1
Installation temperature T1 N/A
Maximum or minimum operating temperature T2 N/A
Temperature derating factor T N/A
Wall thickness tw 0.28 in
Installation and site characteristics
Depth H 6.0 ft
Bored diameter Bd 14.8 in
Soil type Loose sand
Modulus of soil reaction E' 0.5 ksi
Resilient modulus Er 10.0 ksi
Unit weight γ 0.069 ib/in^3
Type of longitudinal weld ERW
Distance of longitudinal weld from trach centerline LG 0 ft
Number of tracks 2
Rail loading E-80
Other pipe steel properties
Young's modulus Es 30000 ksi
Poisson's ratio ϑs 0.3
Coefficient of thermal expansion αT 6,5*10^-6 F°
Check Allowable Barlow stress
Shi(Barlow) Shi 22,687 psi
F*E*T*S 30240.0
Conditon Shi< allowable ? yes
Circumferential Stress Due to Earth Load
tw/D 0.02
E' 0.50 ksi
Stifness Factor Khe 2500.0
H/Bd 4.86
Soil type A
Burial Factor Be 1.09
Bd/D 1.16078431372549
Excavation factor Ee 1.11
Circumferential Stress Due to Earth Load She 2661 psi
Impact Factor Fi and Applied Design Surface Pressure w
Impact Factor Fi 1.72
Rail road E-80
applied design surface pressure w 13.9 psi
Cyclic Stress ∆SHh and ∆SLh
tw/D 0.02203921568627
Resilient modulus Er 10.0
highway stifness factor KHr 320
Outside diameter D 12.75 in
Depth H 6.0 fr
Highway geromtery factor GHr 0.98
Number of tracks 2
Railroad single or double factor Nh 1.11
cyclic circumferentiel stress ∆SHr 8322.279168 psi
tw/D 0.02203921568627
Resilient modulus Er 10.0
highway stifness factor KLr 305
Outside diameter D 12.75
Depth H E-80
Highway geromtery factor GLr 0.98
Number of tracks 2
Railroad single or double factor NL 1
cyclic circumferentiel stress ∆SLr 7146.1012 psi
Circumferential Stress Due to internal pressurization Shi
Operating pressure P 1000.00 psi
Outside diameter D 12.75 in
Wall thickness tw 0.28
Circumferential Stress Due to internal pressurization Shi 22186.8327402135 psi
Principal stresses S1,S2,S3
Young'Modulus Es 30000000 psi
Coefficient of thermal expansion αT 6,5*10^-6 F°
Installation temperature T1 N/A
Maximum or minimum operating temperature T2 N/A
Poisson's ratio ϑs 0.3
Circumferential Stress Due to Earth Load She 2661 psi
cyclic circumferentiel stress ∆SHr 8322.279168 psi
Circumferential Stress Due to internal pressurization Shi 22186.8327402135 psi
Maximum circumferentiel stress S1 33170 psi
cyclic circumferentiel stress ∆SLr 7146.1012 psi
Maximum longitudinal stress S2 14600.4581658141 psi
Maximum Radial Stress S3 -1000.00 psi

Total effective stress Seff 29629.4228314376 psi


Condition Seff <= SYMS *F ? Yes
Check Fatigue
IF LG < ft then
Distance of longitudinal weld from trach centerline LG 0
single or double track factor NL 1
Design factor F 0.72
cyclic circumferentiel stress ∆SLr 7146.1012 psi
Fatigue endurance Limits SFG 12000 psi
Condition Girth welds ∆SLh /NL<= SFG *F ? Yes
else
Distance of longitudinal weld from trach centerline LG 0
single or double track factor NL 1
Design factor F 0.72
cyclic circumferentiel stress ∆SLr 30000000 psi
Fatigue endurance Limits SFG 12000 psi
longitudinal stress reduction factor or fatigue RF ******
Condition Girth welds RF*∆SLh /NL<= SFG *F ? #VALUE!
Design factor F 0.72
cyclic circumferentiel stress ∆SHr 8322.279168 psi
Railroad single or double factor Nh 1.11
Fatigue endurance Limits SFL 21000 psi
Condition Girth welds ∆SLh <= SFG *F ? Yes

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