Zulkikasa Crane was founded in by one man, Richard Teller Crane, who built his company on a set of values that have guided its employees for over years. The current edition consists of crwne chapters that cover the theory and calculation methods used in the design of piping systems as well as the sizing and selection of valves, pumps and fittings, and is published in two versions Metric using SI units and ASME. Empowering Pumps and Equipment. Saving tp efficiently December 27, The two-part Piping System Principles is a self-paced learning course which provides gp comprehensive understanding of the hydraulic principles between components in a fluid system. This year marks its 75th anniversary, and since its inception inthe TP has undergone multiple revisions and updates to remain relevant to generation after generation of engineers.
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Posted 27 October - PM Paul: There are no restrictions on using the Darcy-Weisbach equation in the pressure region below local atmospheric pressure.
Of course, to a chemical engineer, this is lunacy and an invitation to calculation and decision errors. Your example points out a similar case. If you are dealing with compressible fluids, you should be employing absolute values.
It is my belief that Crane Tech Paper is expressing generalities and forgetting that they have published a Nomenclature page at the beginning of the Paper that they are bound to.
They have failed to take into consideration that to deal in psig forces the reader to work in units that define some pressures in the negative range values and worse still, in 0 psig which of course is a positive However, I doubt if there will be any corrections made to the Paper.
The reason, of course, is that Crane is no longer interested in sinking money into Paper ; the piping, valve, and fittings business is no longer that profitable where this can be justified. I still have my original printing version. Fluid Mechanics and fluid flow study is the loser and consequently less advancement in this area continues. A lot still needs to be done.
Thanks Milt Beychok, for your timely and excellent tips on how to employ BB code. May your tribe increase.