By G. F. (Jerry) Gilman
This booklet is for somebody who works with boilers as a utilities supervisor, strength plant supervisor, keep watch over structures engineer, upkeep technician or operator. the knowledge bargains essentially with water tube boilers with precipitated Draft (ID) and compelled Draft (FD) fan(s) or boilers with just a FD fan. although, it may well practice to any steam generator requiring the firing of gas. The ebook addresses matters to be thought of whilst defining dimension transmitters and specification for transmitters. ultimate keep watch over parts are reviewed as to features and sizing. Engineering information on keep an eye on platforms and the setup of a few of the regulate services are lined with particular examples of boiler keep an eye on together with configuration and tuning. The e-book additionally includes a few of the fundamental specifications for a Burner administration process.
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Apparently average specific gravity of such mixtures is different from specific gravity of liquid alone. The problem becomes more difficult, if the liquid is other than water, which is very common in chemical industries. As a result, the net pumping head, flow rate, power, NPSH of the mixture change. So the pump parameters of the mixture is converted into equivalent water parameters by using experimental coefficients called ‘consistency factor’. ‘Consistency’ is defined as the percentage by volume or by weight (or specific gravity) of the solid content or gas content or other liquid present in suspension in the whole pumping mixture.
7. Heavy duty pump Basically pump construction consists of three sub-assemblies namely (1) shaft assembly (2) casing assembly and (3) base assembly or bracket assembly. Shaft assembly, consists of impeller, impeller key, impeller nut, shaft, bushes at stuffing box, bearing inner races, pump coupling, key, and coupling nut, all mounted on a common shaft. The shaft is connected to the prime mover either through belt drive, or direct. This assembly is the only rotating assembly and hence this assembly must be perfectly balanced.
Quantity Q m3/second (sec) L3/t Newton . m sec ML2 3. Power N 4. Speed n 5. 6. Diameter Gravitational acceleration D 7. Density g ρ 8. Viscosity µ 1 sec m t2 1 t L m/sec2 L/t2 kg/m3 M/L3 kg m sec M Lt As per the laws of dimensional analysis, there are 8 parameters with 3 dimensions. Hence, (8 – 3) = 5 non-dimensional parameters can be evolved. After solving, we get the following nondimensional parameters. (1) µ ρVL which is Reynold’s number Re = ρ n D2 µ (2) Q V which is Struhaul’s number Sh = called unit discharge KQ in fluid machines nL nD 3 20 ROTODYNAMIC PUMPS (CENTRIFUGAL AND AXIAL) (3) N called unit power (KN) ρn3 D 5 V2 F = which is Froude number r gl n2 D H (5) D (4) g Multiplying non-dimensional parameters (4) and (5), we get another non-dimensional number H gH .