UNS NUMBERS
When specifying materials for pressure vessels, heat exchangers, and piping, you may see material designations such as UNS N06625. The Unified Numbering System, UNS, was created to standardize the naming…
ASME Code, TEMA and API Facts
Category: ASME Code, TEMA and API Facts
IMPINGEMENT PROTECTION
In shell and tube heat exchangers, the fluid entering the shell side can create a high-velocity jet as it exits the inlet nozzle. If that flow is directed straight…
REPADS AND WEEP HOLES
When a nozzle is added to a pressure vessel shell or head, the opening removes material from the pressure boundary. In most cases, the ASME Code requires that this lost…
UW-33 ALIGNMENT TOLERANCE
The ASME code has a limit to the amount of offset permitted between two plate edges that are to be butt-welded together. Excessive misalignment can create stress concentrations and could…
THE ROLE OF THE AUTHORIZED INSPECTOR (the original AI)
Many people are using AI these days. But in ASME Code fabrication, “AI” stands for Authorized Inspector, a key part of the certification process. The Code requires fabricators to contract…
APPENDIX 46: LEVERAGING DIVISION 2 RULES FOR DIVISION 1 VESSELS
Appendix 46: Leveraging Division 2 Rules for Division 1 Vessels The vast majority of pressure vessels are designed and built to ASME Section VIII, Division 1. While Division 2 typically…
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