.: PIPE STRESS ANALYSIS :.

SERVICES

We perform pipe stress analysis on new and existing piping systems to accomplish the following:
  • Verify that piping stresses are below code allowable values (ASME B31.1, ASME B31.3, etc)
  • Verify that piping loads on rotating equipment are below industry standards (API-610, NEMA SM23, etc.)
  • Verify that piping loads on vessels, tanks, heaters, etc, are below code allowable values (ASME Section VIII, API, etc.)
  • Design spring supports
  • Design rigid pipe supports and restraints
  • Calculate forces and moments for failure analysis
  • Calculate thermal movements
If piping stresses and/or loads on connected equipment exceed their respective allowable values, we make recommendations to reduce the overloaded component/s to acceptable values.

APPLICATIONS
.: New Designs
.: Peer Review of Designs by Others
.: Existing Systems Being Modified
.: Existing Systems with Maintenance Problems
.: Analyzing Piping Failures

INDICATIONS OF PIPING PROBLEMS
.: Excessive Pipe Sag
.: Broken Supports or Restraints
.: Bottomed or Topped Out Spring Supports
.: Unexplained Rotating Equipment Vibrations
.: Damaged Foundations of Connected Equipment and Vessels
.: Flange Alignment Problems
.: Leaking Flanges
.: Shaking or Vibrating Piping
.: Squirming or Leaking Expansion Joints

STRESS ANALYSIS DETAILS
Accuracy and a high level of detail are needed for the analysis to accurately predict piping stresses and piping loads onto connected equipment. PEC excels in this area. Our experience collecting data, field checking piping drawings against as-built systems, knowing what data is needed, detailed modeling techniques, and pipe modeling experience, allows us to quickly and accurately model piping systems.

PROBLEM SOLVING
PEC excels in solving piping problems. Our experience solving piping problems of all kinds, allows us to quickly recognize problems and develop solutions that work, are practical, and economical. Quite often piping problems are identified during our field visits collecting data. When this occurs, we sketch details needed for recommendations during our preliminary visits, thus, solutions are provided sooner, and the results of the modifications have been previously used and are known to be successful.

TEACHING PIPE STRESS ANALYSIS
PEC will teach plant engineers how to perform piping stress analysis, and how to properly apply ASME B31.1 and ASME B31.3 piping codes. If you have a piping problem or need a new line designed and analyzed, and would like to learn piping stress analysis we do the following: Visit your plant or facility, bringing a laptop computer, stress analysis software, and engineering books. Together, our engineer and your plant engineer will collect the needed analysis drawings, specifications and data; build the piping model with the stress analysis software; then analyze the piping system and develop recommendations so that piping stresses and piping loads on connected equipment are below their respective allowable values. In the end, the plant has its system modeled and analyzed (Goal #1), the plant engineer knows and understands this piping system very well (Goal #2), and the plant engineer has began developing a knowledge of how to design a piping system per the ASME B31 piping codes (Goal #3). After approximately three of these jobs, the plant engineer can analyze his own piping systems. If needed, we are available to check input, calculations, results, recommendations, etc. The cost for this analysis is about the same as an ordinary engineering job. It usually takes a few hours longer to model the piping system and make recommendations because it requires explanations and instructions. However, it takes less time to collect the analysis data because the plant engineer can usually locate drawings and specifications quicker than our engineers whom are not as familiar with your drawing/file rooms.