Moisture correction

Meiidional tiow vector, 152 Meter run requirements, 431 Method of piping, 190 Michell bearing, 201 Mini lube system, leeiprocating, 78 Mixed flow, II, 14 Mixed-flow impeller, 14 Mixture compressibility, 20 Mode shape,s, 386, 388 Moisture corrections, 2 Mole, U ... 

Was moisture correction, if required, performed for the final results ... 

The techniques described below have been tested for sediment analysis at the occasion of three interlaboratory studies (TBT-spiked sediment, harbour sediment and coastal sediment). As detailed in Section 5.3, they were first tested with simple solutions to verify that no systematic error could be attributed to the detection step. Since calibration is of paramount importance, participants were provided with pure calibrants of tributyltin chloride synthesized by TNO for the verification of their own calibrants. In all the methods, the storage of the extracts (when necessary) was always at 4 °C in the dark. The moisture correction was carried out by drying a separate sediment portion of 1 g at (105 + 2)°C for 2 h the moisture content obtained by the different laboratories ranged from 1.2 to 2.3%. 

The participating laboratories had to apply moisture corrections according to the procedure recommended by the SM T programme, as well as corrections for extraction recoveries using a trimethyllead-spiked urban dust material provided along with the reference material. 

In some cases, particularly in the filtration of highly concentrated suspensions, when working out the mass of dry cake from filtrate volume collected a cake moisture correction has to be applied, which accounts for the presence of moisture in the cake. The relationship that replaces equation 9.9 in such cases is obtained from solids concentration c (kg m ) in the original suspension and from the moisture content of the cake... 

There is hidden assumption in equation 4 that the volume of the soHds and Hquid retained in the cake is negligible. This is reasonable at low concentrations but can lead to errors at high soHds concentrations and moisture contents of cakes. A corrected value of the concentration c can be used in equation 4 to reduce the errors, ie. 

Polarimetric determination of the sucrose concentration of a solution is vaUd when sucrose is the only optically active constituent of the sample. In practice, sugar solutions are almost never pure, but contain other optically active substances, most notably the products of sucrose inversion, fmctose and glucose, and sometimes also the microbial polysaccharide dextran, which is dextrorotatory. Corrections can be made for the presence of impurities, such as invert, moisture, and ash. The advantage of polarization is that it is rapid, easy, and very reproducible, having a precision of 0.001°. 

AH = moisture-content correction of air saturated at wet-bulb temperature when barometric pressure differs from standard barometer, gr/lb dry air NOTE To obtain AH reduce value of AH by 1 percent where t — t, = 24 F and correct proportionally when t — is not 24 F h = enthalpy of moist air, Btu/lb dry air... 

Pretreatment Chemicals Even though the suspended solids concentration of the slurry to be tested may be correct, it is frequently necessary to modify the sluriy in order to provide an acceptable filtration rate, washing rate, or final cake moisture content. The most common treatment, and one which may provide improvement in all three of these categories, is the addition of flocculating agents, either inorganic chemicals or natural or synthetic polymers. The main task at this point is to determine which is the most effective chemical and the quantity of chemical which should be used. 

Variations in measurable properties existing in the bulk material being sampled are the underlying basis for samphng theory. For samples that correctly lead to valid analysis results (of chemical composition, ash, or moisture as examples), a fundamental theoiy of sampling is applied. The fundamental theoiy as developed by Gy (see references) employs descriptive terms reflecting material properties to calculate a minimum quantity to achieve specified sampling error. Estimates of minimum quantity assumes completely mixed material. Each quantity of equal mass withdrawn provides equivalent representation of the bulk. 

Coal analyses are reported on severalbases, and it is customaiy to select the basis best suited to the application. The as-received basis represents the weight percentage of each constituent in the sample as received in the laboratoiy. The sample itself may be coal as fired, as mined, or as prepared for a particular use. The moisture-free (diy) basis is generally the most useful basis because performance calculations can be easily corrected for the ac tual moisture content at the point of use. The dry, ash-free basis is frequently used to approximate... 

PB and MDE correction of the perforator value to 6.5% board moisture content... 

Since the adsorbent bed must be heated in a relatively short time to reactivation temperature, it is necessary that the reactivation steam rate calculation is increased by some factor that will correct for the nonsteady-state heat transfer. During the steaming period, condensation and adsorption will take place in the adsorbent bed, increasing the moisture content of the adsorbent. A certain portion of the adsorbate... 

Density Factor A factor used to correct the density of standard air or other gases for altitude, temperature, or moisture content. 

Waterproofing correctly formed concrete will not transmit liquid water but will always remain permeable to moisture vapor ... 

Essentially Complete Removal of Water from Sample. Though this assumption must be made in the case of all direct methods (oven, distillation, Fischer, etc.) its correctness is most difficult to prove and in many cases it turns out to be one of the greatest sources of error. Two factors are involved the equilibrium moisture content and the rate of removal of moisture. 

It is realized that such rigorous assignment of drying times cannot be strictly correct, because the required time should increase with increasing moisture content. The errors thus incurred would, however, be small for most dehydrated vegetables (moisture... 

The problem of permeability exists whenever a plastic material is exposed to vapor, moisture, or liquids. Typical cases are electrical batteries, instruments, components installed underground, encapsulated electrical components, food packaging, and various fluid-material containers. In these cases, a plastic material is called upon to form a barrier either to minimize loss of vapor or fluid or to prevent the entrance of vapor or fluid into a product. From the designers viewpoint, the tolerable amount of permeation established by test under conditions of usage with a prototype product of correct shape and material is the only direct answer. 

The correct and critical estimate of the diffusion coefficients may be used to get informations on the morphological modifications occurring in presence of the sorbed moisture. 

Liicker and Thorius-Ehrler 1993). In some cases also for the moisture content a correction factor has to be applied if the actual moisture content differs significantly from that stated in the certificate. 

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