PVEng started in 1999 as a one person company located in the founder’s basement. The first paying job was the design of an ASME rated water filter 10 feet diameter by 15 feet tall. A faxed pencil sketch was turned into an AutoCAD drawing with Excel calculations. Other early jobs were for calculations only or review and P. Eng. stamp of calculations and drawings by others.
4,000 jobs later a lot has changed. Fax has been replaced by email. Calculations that used to be done in Excel are now done in industry standard programs like Compress, Design Calcs, PV Elite and Nozzle Pro. AutoCAD has been replaced with SolidWorks unless required by our customers. Finite Element Analysis has been added to solve problems that cannot be solved by the application of code rules. And the company of one is now nearing twenty. However, through all the changes, the mix of jobs has remained the same. While ASME code design is still our core focus, we now work to more ASME standards: I, IV, VIII-1, VIII-2, B31.1 B31.3 and others such as API-620 and 650. Although we use commercial design software where we can, we also have an extensive library of spreadsheets for applications where nothing else will work.
This is a typical audit vessel used for first time ASME VIII-1 audits, or when no in-production vessel can be used. Calculation verification, what happens during an ASME audit and how many sample vessels need to be built to justify more than one ASME stamp are discussed.
Water Softener Vessel
This water softener is typical of many we have designed for drinking water or industrial use. The use of Compress, IBC Seismic calculations, and using SolidWorks for vessel drawing is discussed.
Horizontal Retention Vessel
This 8ft diameter contact tank (or retention vessel) keeps water and chlorine in contact for a guaranteed minimum safe amount of time at the maximum possible flow rate. Saddle design is discussed.
This sample heat exchanger is a collaboration with H&C Heat Transfer Solutions who ran the heat transfer calculations. The sample includes a brief discussion of UHX design, PV Elite code calculation software and using SolidWorks for drawings.
External pressure (vacuum) calculations are more complex than internal pressure calculations. Once jackets or other sources of pressure are added the difficulty increases. What affects the external pressure rating and the failure mechanisms are discussed.
Designing Trouble-free Large Obround Nozzles
ASME VIII-1 Code provides the required rules to design obround nozzles, but it takes more to design a trouble free obround nozzle that does not leak.
Tower with Wind, Seismic and Vacuum Loads
This tower is designed for a combination of seismic, wind and external pressure (vacuum) loads. The calculations are done in Compress, and the drawing is made in SolidWorks. Which loads govern and how to support junctions is discussed.
Comparison Between Head Types: Hemi, SE, F&D and Flat
We compare the required thickness of Hemispherical (Hemi), Semi Elliptical (SE), Flanged and Dished (F&D) and Flat heads using the rules of VIII-1 and VIII-2 FEA.
ASME Methods Blog
Samples, articles and guides for the design and modeling of ASME pressure vessels.
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