Double Tubesheet Designs
If your process absolutely cannot tolerate mixing of the shell side and tube side fluids in a heat exchanger due to safety or process purity concerns, you may want to…
Tag: Joint Design
Seismic Design
Similar to our discussion of wind design last month, seismic forces should be considered in pressure vessel design. Earthquakes are rare, but if not properly accounted for, a pressure vessel…
Dimensional Tolerances
The ASME code has surprisingly few dimensional tolerances. In fact, in section U-5, the Code states that tolerances are not fully addressed, and allowable tolerances should be based on engineering…
ASME Section IX – Welder Qualifications
In previous articles, we discussed weld procedures and PQR’s (qualifications of weld procedures). What about the people making the welds? Welders also must be qualified per the rules of Section…
ASME Section IX – Weld Procedures
All welds on pressure vessels must be made by qualified welders, using qualified weld procedures. Section IX of the ASME Code specifies all the requirements for those qualifications. A weld procedure,…
Seal vs. Strength Welds
Heat exchanger tube end welds can be specified as strength welds or seal welds. What is the difference? The tube to tubesheet joint is a critical component of the exchanger…
