Shell Length for Internal/External Pressure
When designing a cylindrical shell for internal pressure, the basic variables needed are the diameter, pressure, material allowable stress, and weld efficiency. The length of the shell is not a…
Category: ASME Code, TEMA and API Facts
ASME Code Part UHX and TEMA
Part UHX of the ASME code includes design, fabrication, and inspection rules for shell and tube exchangers. Any parts of UHX that apply to a certain exchanger must be followed…
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…
Wind Design
UG-22 of Section VIII says that vessel designers must account for any and all expected loads on a vessel, in addition to the internal and external pressure loadings you might…
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…
Heat Exchanger Fouling
Over time in service, deposits typically build up on the surface of tubes in a heat exchanger. This buildup is known as fouling and can occur on the inside or outside…
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