Activate Bourdon Effects - CAESAR II - Help

CAESAR II Users Guide

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English
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CAESAR II
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CAESAR II Version
12

Specifies the Bourdon effects option to use. Choose the option from the drop list to activate the Bourdon pressure effect. The Bourdon pressure effect causes straight pipes to elongate, or displace along their axes, and causes curved pipes or bends to elongate along the line that connects the bends near and far nodes. If the Bourdon effect is not activated, there are no global displacements due to pressure.

  • New Job Bourdon Pressure in the Configuration Editor sets the use of Bourdon effects for new jobs, but has no effect on an existing job. Activate Bourdon Effects sets the Bourdon effects for existing jobs.

  • The Bourdon effect is always considered for FRP pipe, regardless of the setting of the Activate Bourdon Effects option.

By default, CAESAR II does not include the Bourdon effect in the analysis of steel piping systems. That is, there are no displacements of the system due to pressure.

As an option, you can include pressure displacement effects. These effects can be appreciable in long runs of pipe or in high pressure, large diameter bends adjacent to sensitive equipment.

Bourdon effects are almost always important in fiberglass reinforced plastic piping systems. For this reason, the Bourdon (Translational) is automatically turned on for all FRP pipe runs and bends.

Two Bourdon options are available:

  • Use the Translation only option when the elbows in the system are forged or welded fittings and can reasonably be assumed to have a circular cross section.

  • Use the Translational & Rotational option when the bends in the system are fabricated by the hot or cold bending of straight pipe. In these cases, the slight residual ovalization of the bend cross-section, after bending, causes the bend to try to straighten out when pressurized. Fixed end moments are associated with this opening. These fixed end moments do not exist when the original shape of the bend cross-section is circular.