WHAT IS A HOLD POINT?
A hold point is a required inspection or approval step that must be completed before fabrication can continue. Hold and other inspection points are identified in the Inspection and Test…
ASME Code, TEMA and API Facts
Category: ASME Code, TEMA and API Facts
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…
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…
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