This tool is developed to perform stress analysis on buried steel line pipe to ensure code compliance under maximum operational conditions. Please refer to applicable design codes and standards for allowable limits. When machinery is involved in the piping system, the same consultants performing the dynamic mechanical finite element analysis FEA should also complete the Pipe Stress Analysis. Solution: In order to help environment, Bentley no longer produces printed application manuals.
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SST Systems, Inc. All Rights Reserved. So, we decided to provide a simple tutorial on the basics of piping stress analysis. So, when as designed piping systems are handed-off to pipe stress engineers for detailed analysis, they soon realize that the systems are stiff and suggest routing changes to make the systems more flexible.
The piping designers, in turn, make changes to routing and send the revised layout to the pipe stress engineers to check for compliance again. Such back and forth design iterations between layout and stress departments continue until a suitable layout and support scheme is arrived at, resulting in significant increase in project execution time, which, in turn, increases project costs.
This delay in project execution is further worsened in recent years by increased operating pressures and temperatures in order to increase plant output; increased operating pressures increase pipe wall thicknesses, which, in turn, increase piping stiffnesses further. Such increased operating temperatures applied on stiffer systems increase pipe thermal stresses and support loads.
So, it is all the more important to make the piping layout flexible at the time of routing. Sustained Loads These mainly consist of internal pressure and dead-weight. Dead-weight is from the weight of pipes, fittings, components such as valves, operating fluid or test fluid, insulation, cladding, lining etc. Additionally, internal pressure gives rise to axial stresses in the pipe wall.
A pipes deadweight causes it to bend generally downward between supports and nozzles, producing axial stresses in the pipe wall also called bending stresses which vary linearly across the pipe cross-section, being tensile at either the top or bottom surface and compressive at the other surface.
If the piping system is not supported in the vertical direction i. For the calculated actual stresses to be below such allowable stresses for sustained loads, it may be necessary to support the piping system vertically. Typical vertical supports to carry deadweight are: Variable spring hangers Constant support hangers Rod hangers Resting steel supports. Rod hangers and resting steel supports fully restrain downward pipe movement but permit pipe to lift up.
A couple of examples are presented in this tutorial to illustrate how piping can be supported by spring hangers and resting steel supports to comply with the code requirements for sustained loads. Thermal Loads Expansion Loads These refer to the cyclic thermal expansion or contraction of piping as it goes from one thermal state to another for example, from shut- down to normal operation and then back to shut-down.
If, on the other hand, the pipe is restrained in the directions it wants to thermally deform such as at equipment nozzles and pipe supports , such constraint on free thermal deformation generates cyclic thermal stresses and strains throughout the system as the system goes from one thermal state to another.
So, in order to avoid fatigue failure due to cyclic thermal loads, the piping system should be made flexible and not stiff. For example, if two equipment nozzles which are to be connected by piping are in line, then the straight pipe connecting these nozzles will be very stiff. In addition to generating thermal stress ranges in the piping system, cyclic thermal loads impose loads on static and rotating equipment nozzles.
By following one or more of the steps from a to d given above and steps e and f given below, such nozzle loads can be reduced.
Pipe Stress Analysis Tutorial
LC Peng has authored, co-authored and presented many technical papers on these subjects. Electronic versions of his most popular papers are available below. Pipeplus drawbacks consist of the use of the "control card" for setting analysis parameters, and what was for me just totally terrible customer support including cancelling an appointment at their home office the day before it was scheduled and then informing me that no "office visits" were allowed. For my money I would rank thse programs on a scale of 1 to 10 as: Ceasar 9, Autopipe 9, Pipeplus 3. It has served us well and is easy to use. They used to have a training course taught by a B31 code committee member and the Caepipe staff. I assume they still offer that.
Piping systems experience different loadings, categorized into three basic loading types listed below. Sustained Load: It mainly consists of internal pressure and dead-weight. Dead-weight is from weight of pipes, fittings, components such as valves, operating fluid, insulation, cladding, lining etc. In addition, internal pressure develops axial stresses in the pipe wall. On the other hand, dead-weight causes the pipe to bend generally downward between supports and nozzles, producing axial stresses in the pipe wall also called "bending stresses" ; these bending stresses linearly vary across the pipe cross-section, being tensile at either the top or bottom surface and compressive at the other surface. If the piping system is not supported in the vertical direction i.
CAEPIPE MANUAL PDF
Create piping models quickly and easily Piping Design and Analysis Software AutoPIPE provides you with a comprehensive and advanced software tool specialized in pipe stress analysis. Increase your productivity and improve quality control with an intuitive modeling environment and advanced analysis capabilities. Ensure efficient workflows between pipe stress engineers, structural engineers, and CAD designers through interoperability with leading plant design applications. Speed the design of Class 1, 2, and 3 nuclear piping systems with advanced analysis capabilities such as nonlinear hydrotest analysis, integrated through-wall thermal gradient, built-in fluid transient analysis, thermal bowing or stratification, and seismic response spectra enveloping, for process, power, oil and gas, nuclear, underground, offshore, and subsea pipeline. AutoPIPE saves you time by enabling you to create, modify, and review piping and structural models and their results quickly and easily.
07. What are the Participation Factors and the Captured Modal Mass in AutoPIPE's frequency report?
CAEPIPE performs linear and non-linear, static and dynamic pipe stress calculations for piping systems of any complexity, in any industry. It determines structural response of pipe and pipeline systems to various types of loadings and computes stresses in accordance with numerous international codes and standards. The Evaluation version of CAEPIPE pipe stress analysis software lets you work with any pipe size and allows you to model up to 20 nodes with no time limit. Designed by piping engineers who understand your job Dedicated pipe and pipeline stress analysis solution, not a copied together and repackaged CAD program Practical and intuitive, flexible and nimble, mature and robust Unmatched speed with tight coding and zero bloatware Long-term clients ABB, US Navy, ConEd, Exxon, Northrop Grumman Corp. SST pioneered piping analysis software for the PC with the introduction of CAEPIPE and continues to lead the industry with the best in class capabilities, most cost-effective, productive, and easiest-to-learn software available.