Introduction
PVEng was contracted to perform a pipe stress analysis on a new piping system layout which was to replace an existing system. For the new piping layout, the customer wanted to use the existing Spring Hanger location and install a new Spring Hanger for the new operating loads.
A model of the piping system was created in Caesar II using the client provided drawings and design data. Conservatively it was assumed that the Nozzles N4 and N5 are fully restrained. The load setup values for the existing Spring Hanger were not provided, so the client requested PVEng to make recommendations on Spring Hanger operating load value, size and type.
The piping internal design pressure was 2,337 psi @ 374 °F and the fluid media was urea solution.
Recommended Spring Hanger to be used in this application based on CAESER II Output values was:
Anvil B-268, Type F, Size 8.
Below are the highlights of an example of a typical pipe stress analysis report for a small piping system with spring hanger.
Read the full sample report for more details. Download Report
Highlights
Fig 1: NPS 4″ Connecting Inlet and Outlet Piping
Fig 2: Model Design Temperature T1 Distribution
Fig 3: Model Design Pressure P1 Distribution
Fig 4: Maximum code stresses
Fig 5a: Node N-50 Maximum Displacements. Maximum displacement values were taken from all operating conditions design cases (L19). The values in the X, Y, and Z directions are shown above.
Fig 5b: Node N-50 Maximum Displacements. Maximum displacement values were taken from all occasional cases (L20) and expansion case (L22). The values in the X, Y, and Z directions are shown above.
Fig 6a: Maximum nozzle load values were taken from all operating design cases (L19). The values in the X, Y, and Z directions above are shown above.
Fig 6b: Maximum nozzle load values were taken from all occasional cases (L20). The values in the X, Y, and Z directions above are shown above.
Fig 7a: Maximum nozzle load values were taken from expansion case (L22). The values in the X, Y, and Z directions above are shown above.
Fig 7b: Load values table
Fig 8a: Spring Hanger operation load values were taken from operation case (L19). The values in the X, Y, and Z directions are shown above
Fig 8b: Load values table
Fig 9: Spring Hanger Recommended Type, Size and loads are presented in the table above. Spring Hanger Table – Caesar II Output