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Attention: Please see the following AutoPIPE help sections:
Help > Contents> Contents Tab>
1. Reference Information> Pipe SoilThis section will provide information on
a. Model Discretization
b. Defining Soil Points in AutoPIPE
c. Soil Restraint Properties in AutoPIPE
d. Calculation of Soil Restraint Properties - AutoPIPE Method
e. Calculation of Soil Restraint Properties - ASCE Method
f. Calculation of Soil Restraint Properties - PRCI Method
g. Comparison of Soil Restraint Properties
h. Soil overburden stresses application on AutoPIPE points
2. Modeling Approaches> Example systems> PIPE-SOIL Interaction: Transition Example.
The purpose of the following example system is to demonstrate the procedure required to
a. Calculate soil properties using AutoPIPE and ASCE method
b. Verification of values with hand calculations
c. Determine the location of critical piping points to be defined for the above to below ground (transition) piping system shown in the Figure below.
In this example, the piping system is subjected to a temperature rise of 230°F, and an internal pressure of 100 psi. For simplicity, a single soil will be assumed to interface with the pipe over the entire length of the buried portion of the system.This online help section will provide step by step procedure of modeling soil properties in AutoPIPE.
3. Procedure described in AutoPIPE Workbook was developed by SSD for piping systems and pipelines who also help write ASCE “Guidelines for the design of buried steel pipe”.
4. Soil parameters Definitions
k1 – soil stiffness value at yield displacement of the soil (lb/in/ft) – notice as this value decreases, the Yield Displacement will increase – Yield Disp. = p1 / k1
p1 – maximum soil resistance per unit length of pipe
k2 – stiffness of soil after yield has occurred (conservative to assume a small value)
1. These dialogs are only available for the following piping code years:
a. B31.1-2004 or higher b. ASME B31.4 Liquid Trans. 2004 or higher when ASME CC N-755-1 (HDPE) option was enabled.c. ASME B31.8 Gas Trans. & Dist 2004 or higher when ASME CC N-755-1 (HDPE) option was enabled.d. ASME NC 2004 or higher d. ASME NC 2004 or higher .
2. See AutoPIPE help for reference to Adams et. al.