Division 2/Appendix 46 Assessments
Why use Metalmark Engineering for your Division 2 assessment?
Speed in Proving Viability: We quickly determine if your pressure vessel or heat exchanger is a good candidate to use Division 2 rules*.
Calculation Accuracy: We are experienced in using the latest software tools to generate Division 2 ASME Code calculations.
Cost Savings: Due to the differences in the Division 1 and Division 2 Code computations, designs using Division 1 Code calculations may require additional material than designs using Division 2 Code calculations. Taking advantage of these differences may result in significant cost savings.
Lead Time: Pressure vessels and heat exchangers designed using Division 2 rules may require significantly fewer welds; designs with fewer welds can significantly reduce your lead time.
Process Experience: We are experienced in identifying API 571 damage mechanisms in process equipment and piping. From material selection to long-term maintenance plans, we are experienced in supporting the integrity of your process equipment.
Appendix 46 for Large, Non-Radial Nozzles
Don’t let large, non-radial nozzle designs ruin your design schedule. Pass nozzle reinforcement calculations and stay ASME Code compliant by using Appendix 46.
A recent client had a big problem with a large nozzle. The 10’ (3m) vessel diameter and 42” (1m) nozzle diameter pushed the Division 1 nozzle calculations into Mandatory Appendix 1-7. The nozzle design would have easily passed the Appendix 1-7 calculation at the design pressure of 50 psi if it were radial. But it wasn’t. The 2” inch offset was non-negotiable and pushed it outside of Appendix 1-7 due to failing Appendix 1-7(b)(1).
This represented a perfect case for using the Appendix 46 nozzle rules. Appendix 46 combines Division 2 nozzle design rules with Division 1 allowable stresses. The more accurate numerical method combined with the high safety factor gives an ASME Code compliant solution that satisfies most regulators. Ask your regulator about using Appendix 46 as direct-replacement nozzle rules and solve problems like large, non-radial nozzles within minutes without employing FEA.
Is your Renewable Natural Gas (RNG) or Nuclear project trying to go fast? Metalmark Engineering works at turnaround speeds to help your team get your project up and running while adhering to the latest Codes and Standards.
Using Appendix 46 for External Pressure
Have you started using the Appendix 46 solution for external pressure calculations?
I encourage you to become familiar with the Appendix 46 external pressure solution as the more accurate calculation method provides benefits over the Division 1 solution. Try creating a spreadsheet for the Appendix 46 external pressure method and compare it to the Division 1 solution over a wide range of diameters and materials. This helped build my confidence in the method and will build your confidence too.
Take a look at this simple 8’ inner diameter carbon steel vessel at 425°F where the Appendix 46 solution passes the vacuum case and the Division 1 solution fails the vacuum case.