The relevant chart appears on:
http://www.mcnallyinstitute.com/Charts/NPSH_reduction_chart.html
Karassik et al., in their Pump Handbook (McGraw-Hill) show this chart (constructed from test data) saying that it could be used subject to some listed limitations.
I'd appreciate to read your...
I've a friend that has quite succesfully participated in HAZOP teams as chairman for a few years now, based on his wide and long experience as process engineer.
Somebody told me that nowadays such a person would need accreditation by a recognized authority to act as chairman of a HAZOP...
Question: Has anybody ever seen centrifugal pump characteristic curve plots (on cartesian coordinates) with head on the ordinate vs. the square of the flow rate on the abscissa to show a "straight" contour ?
Could you comment on the advantage of such, especially when referring to large pumps...
Although the efficiency of an engine operating between, say, 25oC (surface of tropical oceans) and 5oC (hundreds of meters down) is just 7% (= 1 - 278 K/298 K) there are sufficiently large amounts of warm ocean water to consider exploiting this free energy of solar origin.
Can anyone enlighten...
I'd be thankful for the submission of any link or other information on the comparative adhering tendency of coke-like polymeric deposits inside stainless vs carbon steel tubes in heat exchangers, as function of surface rugosities, or metallurgical chemical composition, or flow r[é]gimes.
Would anyone kindly tell us the advantages of either metallurgy for tubes in process fired heaters in oil petroleum refineries, in particular with regard to creep fatigue ?
I was used to the definition of WCF as the cooling effect of a combination of temperature and wind velocity, expressed as the heat lost by the skin surface exposed to higher convection heat transfer coefficients, depending on the body size, shape and metabolic rate. Re-reading an old thread I...
Tests and accumulated experience have shown that pumps can handle hydrocarbons and some alcohols with less NPSH than would be necessary for cold degassed water. The Hydraulic Institute (1983, 14th Ed.) NPSH depicted these reductions in a graph.
The admissible NPSH reduction is apparently a...
Following the famous concept of critical thickness of insulation (rout=k/h), has anybody confirmed by experience that, up to a given fouling thickness, heat transfer actually increases with fouling in the convection section of a fired heater ?
Where:
rout = outside radius, m
k = thermal...
I think this query belongs to the "fluid mechanics" forum. This is a question to satisfy my curiosity.
The sap being a water solution of mineral nutrients and aminoacids ascends through the xylem. What is the plausible driving force that explains the upward motion of the sap in tall trees...
Although these expressions are used interchangeably, there is, however, a difference, and the LFL/UFL are preferred over LEL/UEL values for safety reasons, probably because of their wider range. Any comment ?
I've read in eng-tips forums, at least, one discussion about the meanings and differences between accuracy and precision.
What can participants also say about repeatability, reproducibility, replicability, and their relation with precision or accuracy ?
Although quality is easy to talk about in generalities, it's difficult to define in specifics.
It was Aristotle who said: "Quality is not an act. It is a habit."
Think for a minute what quality, or the lack of it, means to you, objectively as well as subjectively, and let us learn from your...
