Lifting Incorrectly

There are two possible causes. The first could be incorrect control of water treatment and blowdown. This can result in excessive levels of suspended solids in the boiler water, organic matter in the boiler water or high alkalinity. The second can be mechanical. If the boiler is operated below its designed working pressure it will increase the efflux velocity of the steam leaving the water surface area to a point where it may lift the water surface and drop the water level. It is important therefore to give due consideration to the steam load required from the boiler. 

Correct manual lifting and handling of material prevents strains and injury and also reduces the effort required. Persistently incorrect lifting and handling may lead to the person suffering from permanent back strain or other health problems. Points to consider when preparing to lift material are ... 

With a volume-pneumatic test, mechanics can detect defects in the parts due to incorrect replacement parts, incorrect machining, corrosion, or weak springs. Each of these problems can be discovered by such characteristics as early simmer, only a partial lift or leakage after the test. Defects such as inadvertently installing a spring too strong for the set pressure can be detected by short blow-down or chatter. Competent SRV test craftsmen can pinpoint defects with this type of test equipment. 

Pneumatic Conveying Dryers A gas-solids contacting operation in which the solids phase exists in a dilute condition is termed a dispersion system. It is often called a pneumatic system because, in most cases, the quantity and velocity of the gas are sufficient to lift and convey the solids against the forces of gravity and friction. (These systems are sometimes incorrectly called flash dryers when in fact the moisture is not actually flashed off. True flash dryers are sometimes used for soap drying to describe moisture removal when pressure is... 

According to Kisner Colby (1998), depending on how forestry activities are performed, workers needs often lift and carry loads which weight goes beyond the tolerable limits. In addition, they usually perform these movements in an incorrect and... 

In many tasks, the continuous weight lifting, the movement of heavy weights (since most users are dependent), as well as the need to adopt incorrect postures are hazards which are present in the daily hves of workers, leading to the appearance of critical and sometimes chronic injuries (Johanning, 2000). 

The ergonomy is an important factor to consider when it comes to the health of workers. Sometimes it s observed that the workers do not take the correct postures in terms of load lifting or carrying something, such as is the case with signalling. These incorrect postures are due to a lack of employee training on how to adopt the correct postures in order to prevent serious injury in the short or long term. 

Back injuries are also caused by improper lifting and ergonomically incorrect office chairs. To avoid these injuries, employees should be instructed in proper lifting techniques and provided with ergonomically correct office equipment. 

Skill-based behaviours depend mostly on the operator s practice in performing the task. In short the operator can perform the task without ambiguity. A simplistic view is that skill-based errors are slips or hrpses. These errors tend to be related to highly routine activities in familiar circumstances omissions, repetitions, reversals, interference errors and double-capture slips. An example is incorrect use of foot pedal controls of fork-lift trucks. Some fork-lift trucks... 

Martin Scheerer (4) published several illustrations to exemplify how insight to a problem solution can he delayed or thwarted by fixation of an inappropriate solution. One example required that nine dots (Figure 4.7) he connected by four straight lines without lifting the pencil from the paper. To solve this problem, one must extend the lines beyond the dots (see the solution, Figure 4.8). Most people assume incorrectly that they may not do this and are not able to solve the problem. 

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