MEI venturis are successfully being used on heat exchangers in dozens of plants in the US and Canada, handling large, medium, and small loads.
Qualifying the Application and Sizing the Orifice of a Venturi for Optimal Performance of a Heat Exchanger (HX)
Several factors are taken into consideration when qualifying and sizing a HX for conversion to venturis. MEI evaluates the basic HX design and layout. What is the rated capacity of the HX? If that is not available MEI relies on client running data. MEI makes note of the steam pressure, how the HX is regulated, and whether there is a drip leg present before control.
How is condensate return currently handled? Is the condensate lifted to the return or is it gravity fed to receiver. What is the condensate receiver back pressure. MEI notes the lift in the return and the diameter of return line.
MEI needs the rate of product flow with the temperature in, temperature out, specific gravity and heat of product at a given running pressure. If product flow is not known, MEI requires the steam load at a given pressure to produce the same result in increasing product temperature.
If there is lift in the return and if the return line is large enough to allow flashing, the HX may not qualify for MEI venturis. These are conditions for generating substantial water hammer or flooding of the HX. While these conditions are not caused by the venturi, MEI would prefer to remedy the situation before qualifying the application.
Remedies to Design Problems with Heat Exchangers
MEI has special expertise in areas of heat exchanger design that have resulted in water hammer because of lift in the return. MEI is available as a consultant to review the design and implementation of applications with these situations. MEI will work toward providing a study of these situations on this web site at a near future time in the Technology section. In the meantime, feel free to contact us to engage in this discussion with your particular HX design.