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Pipeng Free Online Software : Cross Section Calculators
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Pipeng : Pipeline Diameter and Cross Section Property Calculation Module

Cross Section Calculators

Description : Pipeline cross section property calculators.

Discussion : Section properties include inside and outside diameter, cross section area and area moments. For standard pipelines (single pipeline layer with no external coatings), use the single layer calculators. For multi layer pipelines with internal lining or external coatings use the multi-layer calculators. For multi layer pipelines, only include the layers which will contribute to the property being calculated. Select the number of layers on the setup page. The first internal layer is the pipe wall.

References :

Calculator Tools In This Module:

CALC : Pipe : Diameter 001 : Multi Layer Pipe Inside and Outside Diameter and Cross Section Area : Calculator
CALC : Pipe : Diameter 006 : Multi Layer Pipe EI Modulus or Bending Stiffness - E Modulus x I Modulus : Calculator
CALC : Pipe : Diameter 007 : Single layer Pipe I Modulus EI Modulus Section Modulus W Shape Factor SF and Radius of Gyration r : Calculator


Link

Module List

CALC : Pipe : Diameter 001 : Multi Layer Pipe Inside and Outside Diameter and Cross Section Area : Calculator

Description : Calculate diameter and cross section area for multi layer pipelines.

Discussion : Calculates the cross section area, and internal and external diameter of each layer, and the innermost and outermost diameter overall. Select the number of inner and outer layers on the setup page. The pipe wall is the first inner layer (inner layer 1).

Calculation Steps :

  • Outside layer diameters and cross section area
  • Inside layer diameters and cross section area
  • Inner and outer diameters

Input Variables :

  • D = Pipe Nominal Diameter
  • WTi = Pipeline Inner Layer Wall Thickness
  • WTo = Pipeline Outer Layer Wall Thickness

Output Variables :

  • AXi = Pipeline Inner Layer Cross Section Area
  • AXo = Pipeline Outer Layer Cross Section Area
  • ID = Pipe Inner Diameter Including Layers
  • IDi = Pipeline Inner Layer Inside Diameter
  • OD = Pipe Outer Diameter Including Layers
  • ODo = Pipeline Outer Layer Outside Diameter

Calculation :

ODo[0] = D
IDi[0] = D
Loop i
j = i - 1
ODo[i] = ODo[j] + 2 WTo[i]
AXo[i] = π / 4 ( ODo[i] 2 - ODo[j] 2 )
End of i Loop
Loop i
j = i - 1
IDi[i] = IDi[j] - 2 WTi[i]
AXi[i] = π / 4 ( IDi[j] 2 - IDi[i] 2 )
End of i Loop
ID = IDi[3]
OD = ODo[4]

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CALC : Pipe : Diameter 006 : Multi Layer Pipe EI Modulus or Bending Stiffness - E Modulus x I Modulus : Calculator

Description : Calculate pipeline EI modulus or bending stiffness, EA modulus or xxial stiffness and thermal expansion force coefficient EAα for multi-layer pipelines.

Discussion : Only include the layers which will contribute to the modulii. Generally external coating layers do not contribute. Goto the setup page to change the number of layers.

Calculation Steps :

  • Outside layer modulii
  • Inside layer modulii
  • Total modulii values

Input Variables :

  • αi = Pipeline Inner Layer Thermal Expansion Coefficient
  • αo = Pipeline Outer Layer Thermal Expansion Coefficient
  • D = Pipe Nominal Diameter
  • Ei = Pipeline Inner Layer Youngs Modulus E
  • Eo = Pipeline Outer Layer Youngs Modulus E
  • WTi = Pipeline Inner Layer Wall Thickness
  • WTo = Pipeline Outer Layer Wall Thickness

Output Variables :

  • EA = Pipeline EA Modulus
  • EAα = Pipeline Thermal Expansion Force Coefficient
  • EAαi = Pipeline Inner Layer EAα Coefficient
  • EAαo = Pipeline Outer Layer EAα Coefficient
  • EAi = Pipeline Inner Layer EA Modulus
  • EAo = Pipeline Outer Layer EA Modulus
  • EIi = Pipeline Inner Layer EI Modulus
  • EIo = Pipeline Outer Layer EI Modulus
  • EIp = Pipeline Nominal EI Modulus
  • IDi = Pipeline Inner Layer Inside Diameter
  • ODo = Pipeline Outer Layer Outside Diameter

Calculation :

ODo[0] = D
IDi[0] = D
Loop i
j = i - 1
ODo[i] = ODo[j] + 2 WTo[i]
EIo[i] = Eo[i] π / 64 ( ODo[i] 4 - ODo[j] 4 )
EAαo[i] = αo[i] Eo[i] π / 4 ( ODo[i] 2 - ODo[j] 2 )
EAo[i] = Eo[i] π / 4 ( ODo[i] 2 - ODo[j] 2 )
End of i Loop
Loop i
j = i - 1
IDi[i] = IDi[j] - 2 WTi[i]
EIi[i] = Ei[i] π / 64 ( IDi[j] 4 - IDi[i] 4 )
EAαi[i] = αi[i] Ei[i] π / 4 ( IDi[j] 2 - IDi[i] 2 )
EAi[i] = Ei[i] π / 4 ( IDi[j] 2 - IDi[i] 2 )
End of i Loop
EIp = ArraySum( EIi ) + ArraySum( EIo )
EAα = ArraySum( EAαi ) + ArraySum( EAαo )
EA = ArraySum( EAi ) + ArraySum( EAo )

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CALC : Pipe : Diameter 007 : Single layer Pipe I Modulus EI Modulus Section Modulus W Shape Factor SF and Radius of Gyration r : Calculator

Description : Calculate pipeline I modulus, Shape factor, W section modulus, EI modulus or bending stiffness, EA modulus or sxial stiffness and thermal expansion force coefficient EAα for single layer pipelines.

Discussion : Coatings are not included in the calculations.

Calculation Steps :

  • ID and area
  • Modulii

Input Variables :

  • α = Pipe Thermal Expansion Coefficient
  • D = Pipe Nominal Diameter
  • E = Pipeline Youngs Modulus E
  • t = Pipe Nominal Wall Thickness

Output Variables :

  • Ax = Pipe Wall Nominal Cross Section Area
  • EA = Pipeline EA Modulus
  • EAα = Pipeline Thermal Expansion Force Coefficient
  • EI = Pipeline Nominal EI Modulus
  • I = Pipeline Nominal I Modulus
  • ID = Pipe Nominal Inside Diameter
  • SF = Pipeline Nominal Shape Factor - Section Modulus Ratio
  • We = Pipeline Nominal Section Elastic Modulus
  • Wp = Pipeline Nominal Section Plastic Modulus
  • r = Pipe Nominal Radius Of Gyration

Calculation :

ID = D - 2 t
Ax = π / 4 ( D 2 - ID 2 )
I = π / 64 ( D 4 - ID 4 )
EI = E I
We = π / ( 32 D )( D 4 - ID 4 )
Wp = 1 / 6 ( D 3 - ID 3 )
SF = Wp / We
r = 1 / 4 √( D 2 - ID 2 )
EA = π / 4 ( D 2 - ID 2 ) E
EAα = π / 4 ( D 2 - ID 2 ) E α

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3 rows selected

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