Jed, it is not polite to lie, I was not babbling about the impossibility of making errors with a flowmeter I have told exactly that your statement:
"*"Anyone knowledgeable about flowmeters can tell you a dozen ways to make the answer 10 times too large."* *is false and offensive etc. It is not about errors it is about manipulating results- inflating readings.* *Please abstain from using dirty rhetorical tricks.. * *Elementary decency will only help you to become a better propagandist* *you have seemingly found something that fits you better than LENR * *supporter. * On Wed, Jul 6, 2016 at 5:41 PM, Jed Rothwell <jedrothw...@gmail.com> wrote: > Peter Gluck has been babbling on about how it is impossible to make a > mistake with a flow meter. I pointed him to a handy guide to flow meters > from Omega, which he then ignored. Anyway, let me point it out here, > because it is handy. If you are going to work with flowmeters you should > read this carefully. I wish I had read it more carefully years ago. > > http://www.omega.com/prodinfo/flowmeters.html > > Below are some quotes from it. > > If you deliberately install a flowmeter with one of these parameters > wrong, such as bubbles for a meter not designed for them, or "whether the > flow can reverse" (Defkalion's trick), you get the wrong answer. > > > Fluid and flow characteristicsThe fluid and its given and its pressure, > temperature, allowable pressure drop, density (or specific gravity), > conductivity, viscosity (Newtonian or not?) and vapor pressure at maximum > operating temperature are listed, together with an indication of how these > properties might vary or interact. In addition, all safety or toxicity > information should be provided, together with detailed data on the fluid's > composition, presence of bubbles, solids (abrasive or soft, size of > particles, fibers), tendency to coat, and light transmission qualities > (opaque, translucent or transparent?). > > Pressure & Temperature RangesExpected minimum and maximum pressure and > temperature values should be given in addition to the normal operating > values when selecting flow meters. Whether flow can reverse, whether it > does not always fill the pipe, whether slug flow can develop > (air-solids-liquid), whether aeration or pulsation is likely, whether > sudden temperature changes can occur, or whether special precautions are > needed during cleaning and maintenance, these facts, too, should be stated. > > > The sections on "Piping and Installation Area" and "Flow Rates and > Accuracy" shows many more ways to screw up. As I said, if you are a > nefarious person and you want to get the wrong answer, this guide is a > bonanza of information on how to cheat. > > > Piping and Installation AreaConcerning the piping and the area where the > flow meters are to be located, consider: For the piping, its direction > (avoid downward flow in liquid applications), size, material, schedule, > flange-pressure rating, accessibility, up or downstream turns, valves, > regulators, and available straight-pipe run lengths. The specifying > engineer must know if vibration or magnetic fields are present or possible > in the area, if electric or pneumatic power is available, if the area is > classified for explosion hazards, or if there are other special > requirements such as compliance with sanitary or clean-in-place (CIP) > regulations. > > Flow rates and AccuracyThe next step is to determine the required meter > range by identifying minimum and maximum flows (mass or volumetric) that > will be measured. After that, the required flow measurement accuracy is > determined. Typically accuracy is specified in percentage of actual reading > (AR), in percentage of calibrated span (CS), or in percentage of full scale > (FS) units. . . . > > -- Dr. Peter Gluck Cluj, Romania http://egooutpeters.blogspot.com
