Why Re-Rate a Vessel?
Re-rating a pressure vessel allows operating limits such as Maximum Allowable Working Pressure (MAWP) or temperature to be adjusted without replacing the equipment. In many cases, an existing vessel can safely operate at new conditions after engineering evaluation, minor modification, or component replacement.
Re-rating can help you:
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Accommodate process changes requiring different pressure or temperature conditions
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Extend the usefulness of existing equipment instead of purchasing a new vessel
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Reduce capital cost by re-using existing assets
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Support debottlenecking or capacity increases
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Maintain compliance with applicable codes and inspection programs
When performed properly, re-rating provides a documented and defensible path for continued service under revised operating conditions.
Our Re-Rate Engineering Services Include
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Code-based design calculations
Evaluation of all pressure-retaining components including shell courses, heads, nozzles, reinforcement, and attachments in accordance with applicable design codes. -
Engineering evaluation of limiting components
Identification of the governing component controlling MAWP and recommendations for modification if required. -
Calculation package and formal report
Complete documentation suitable for inspection records, owner documentation, and regulatory or audit review. -
Alteration guidance (when required)
Recommendations for component replacement, reinforcement, or repair necessary to achieve the desired operating conditions. -
3D modeling and stress analysis (optional)
Advanced modeling and stress evaluation available for complex geometries, high consequence service, or non-standard configurations.
Supporting Inspection & Mechanical Integrity Programs
Re-rate evaluations are coordinated with inspection findings to ensure revised operating limits remain consistent with actual equipment condition. The result is a clear, defensible operating envelope that supports safe operation and long-term asset management.