Piping Stress Analysis



Piping Stress Analysis

Pipe Stress Analysis(thermal flexibility analysis) will predict stresses in piping and loads on equipment resulting from thermal gradients, thermal transients, weights, pressure, and bolt-up strain. This study is typically required for piping that experiences high temperature fluctuations, or for long pipe runs such as hot piping to coolers or headers. Cases where equipment is sensitive to external loads may also require a Pipe Stress Analysis.

The study methodology becomes more complicated for piping systems in vibratory service. As discussed below, the design must address conflicting requirements between the Pipe Stress Analysis (where flexibility is desired) versus the Mechanical Vibration Analysis (which requires stiff supports). Methods are available to manage this conflict and create an optimal piping design.

As a standard engineering practice, it is recommended that following lines to be evaluated for stress analysis:

♦ Lines connected to Pressure vessel: All lines 10" and above.

♦ Lines connected to Rotating equipment: All lines 3" and above.

♦ Lines connected to Air cooler / Heat Exchanger: All lines 4" and above.

♦ Lines connected to flare header: All lines 4" and above.

Contact us for additional information on this.

As a part of Piping stress analysis, we would provide simple solutions and would try to use your existing pipe routing as much as possible. We would use tools like Caesar, Nozzle Pro to analyze pipe / Nozzle for stress evaluation.

Goal Of Piping Stress Analysis:

Structural Integrity:

Design adequacy for the pressure of the carrying fluid.

Failure against various loading in the life cycle . Limiting stresses below code allowable.

Optimal Design:

Avoiding excessive flexibility and also high loads on supporting structures. Aim towards an optimal design for both piping and structure.

Governing Codes and Standards:

Codes and Standards specify minimum requirements for safe design and construction (i. e. provides material, design, fabrication, installation and inspection requirements.)

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