Nozzle Loads and Piping Flexibility Analysis for CRN Registration

The interface between pressure vessels and connecting piping is one of the most complex aspects of pressure system design. CRN submissions for vessels with significant connected piping must address nozzle load capacity. Kopfkino provides integrated nozzle load and piping flexibility analysis.

Nozzle Load Analysis Methods

• WRC Bulletin 107: stresses in cylindrical and spherical vessel shells at nozzle junctions
• WRC Bulletin 297: local stresses for nozzle-in-shell configurations
• FEA for nozzles outside WRC applicability range
• Documentation of nozzle load allowables in CRN package

Piping Flexibility Analysis for CRN

Piping systems registered under CRN require flexibility analysis to confirm thermal expansion stresses are within code-allowable limits. Kopfkino performs Caesar II piping stress analysis as part of piping CRN submissions, including equipment nozzle load summaries for rotating equipment.

Frequently Asked Questions

Do CRN submissions require Caesar II analysis reports?

For piping CRN submissions, piping flexibility analysis is typically required by ABSA and expected by other authorities. The Caesar II output and code compliance summary form part of the CRN package.