Drip feed

Typically, chemical formulations were supplied as balls or briquets and dispensed through bypass feeders or hanging baskets. Alternatively, pulverized or powdered treatments were dissolved in water and pumped to FW tanks or added via drip-feed arrangements. 

A means of adding liquid chemical treatment to a FW tank by means of an overhead dripping container rather than by use of a dosing pump. From a control viewpoint, drip feed is most usually unsatisfactory as the feed rate reduces over time with decrease in treatment head pressure, and ultimately the device tends to gum up. 

Are pumps and day tanks installed for dosing the chemical inhibitors Are they interlinked with the conductivity/TDS control If not, is there a drip-feed system. 

T.I.Fowle ° has pointed out the potential for molybdenum disulphide to reduce wire-wool failures of plain bearings. This type of failure can occur when a hardened adhesive wear particle becomes embedded in a relatively soft bush, causing severe abrasive wear of the counterface. The formation of the initial wear particle can arise from a transient failure of the hydrodynamic lubricant film, caused, for example by temporary interruption of a drip feed or coolant flow. Addition of a small amount of molybdenum disulphide, say 3% or more, to the lubricant can prevent the short-term occurrence of adhesive wear, and thus the formation of the initiating particle. 

This may be either a continuous process, used when the sample size is relatively large (1 ml or more), or a discrete process, used with samples of less than 20 /il. Continuous-flow systems are simpler to use and more precise, but they are less sensitive. They employ a nebulizer in association with a flame or gas plasma, and either a rotating electrode (Rotrode) or drip-feed to the electrode with the arc or spark. The pneumatic nebulizer has an efficiency of 5-10% and generates an inhomogeneous aerosol. Efiiciency can be improved by proper design of the nebulizer and spray chamber (N4), by use of heated nebulizer gas (R6) or ultrasonic devices (S23). The maximum improvement is a 5- to 10-fold increase in sensitivity. There is also an increase in the complexity and cost of the instrument which usually offsets these benefits. The effect... 

Drip feed devices Simple to use, no moving Contaminants can interfere for feed... 

The dye liquor is made up in a manner similar to that described for Class A but the salt is omitted. It is added gradually during the period that the liquor is coming to the boil, and, if desired, the addition may be continued after the boil is reached. If the salt can be dissolved in a separate vessel and added through a drip feed, this method is greatly to be preferred. Surface-active compounds, of which Lyogen DK is an example, can be added to the dyebath with Class B dyes to reduce sensitivity to salt and exercise further control over the rate of exhaustion. 

Drip feed No moving parts as The rate of dosing depends on the level... 

Advocates of context-based courses often cite two particular features which should enhance the understanding of scientific ideas. The first of these is the motivational aspect of the approach if students can see the point of what they are studying, they will engage with the materials and they are likely to learn more effectively. The second relates to the drip feed approach the revisiting of ideas at different points in a course provides more opportunities for students to develop their understanding of scientific ideas. On the other hand, there are those who maintain that such an approach fragments the... 

LUBRICATION, DRIP FEED - A system of lubrication in which the lubricant is supplied to the bearing surface in the form of drops at regular intervals. 

During illness, carbohydrates can be provided as small frequent meals, as drip-feeding, and sometimes as continuous drip-feeding. Using alpha-dextrin maltose preparations has the added advantage of low osmolality and easy digestion. 

If a continuous-drip feeding is used, determine the rate needed to maintain adequate glucose concentrations. 

Derks TG, et al. Dietary treatment of glycogen storage disease type la uncooked cornstarch and/or continuous nocturnal gastric drip-feeding Mol Genet Metab. 2013 109(l) l-2. 

As a liquid, oil can be introduced into the bearing in many ways, such as drip feed, wick feed, pressurized circulating systems, oil bath, or air-oU mist. Each is suited to certain types... 

Open gears operate under conditions of boundary lubrication. The lubricant can be applied by hand or via drip-feed cups, mechanical force-feed lubricators, or sprays. Heavybodied residual oils with good adhesive and fihn-strength properties are required to survive the relatively long, slow, heavy tooth pressure while maintaining some film between applications of lubricant. 

Type I Manual or Drip Feed, less than 1000 fpm Type II Bath or Slinger Disk, less than 2500 fpm Type III Forced Feed, greater than 2500 fpm... 

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