Damages cause

Nuclear power plants of the future are to be designed and operated with the objective of better fiilfiUing the role as a bulk power producer that, because of reduced vulnerabiUty to severe accidents, should be more broadly accepted and implemented. Use of these plants could help stem the tide of environmental damage caused by air pollution from fossil-fuel combustion products (64). 

Despite all these safeguards to extend the service life of the antifreeze, fluid replacement is requited periodically. Typically, fluids are replaced because of irreversible damage caused by one of four conditions contamination, gel formation because of glycol/siUcate reaction, extensive glycol degradation caused by overheating or excessive oxygen exposure, or inhibitor depletion. 

The main mechanisms of hearth bottom wear are high heat load, chemical attack, erosion from molten Hquids, mechanical and thermal stress, and penetration because of ferrostatic and process pressure. A variety of special purpose carbons have been developed to minimize or eliminate the damage caused by these wear mechanisms. 

It is well accepted that hypertension is a multifactorial disease. Only about 10% of the hypertensive patients have secondary hypertension for which causes, ie, partial coarctation of the renal artery, pheochromacytoma, aldosteronism, hormonal imbalances, etc, are known. The hallmark of hypertension is an abnormally elevated total peripheral resistance. In most patients hypertension produces no serious symptoms particularly in the early phase of the disease. This is why hypertension is called a silent killer. However, prolonged suffering of high arterial blood pressure leads to end organ damage, causing stroke, myocardial infarction, and heart failure, etc. Adequate treatment of hypertension has been proven to decrease the incidence of cardiovascular morbidity and mortaUty and therefore prolong life (176—183). 

A blast incident overpressure of 35 kN/m" (5 psi) is often used to define the region beyond which the damage caused will be minor and not lead to significant involvement of plant and equipment beyond the 35 kN/m" boundary. 

Mechanical damage caused, for example, by corrosion or collision... 

Attack by strong acids tends to produce intense localized wastage. Weak acids cause more general corrosion. However, numerous exceptions to these general rules exist. Fortunately, corrosion damage caused by acids has many unique features that allow easy recognition in most cases. 

The toughness of wood is important in design for exactly the same reasons that that of steel is it determines whether a structure (a frame building, a pit prop, the mast of a yacht) will fail suddenly and unexpectedly by the propagation of a fast crack. In a steel structure the initial crack is that of a defective weld, or is formed by corrosion or fatigue in a wooden structure the initial defect may be a knot, or a saw cut, or cell damage caused by severe mishandling. 

The Journal fur Gasbeleuchtung mentions electrolytic corrosion damage caused by direct current cables in Berlin in 1892, and a few years later damage by tramway currents was reported in 14 German towns. As early as 1894 the electrolytic processes of stray current corrosion were explained in detail in this Journal by G.Rasch [65]. 

Impact damage Damage caused by the impact of a 25 mm diameter hemispherical impactor with 135 J of kinetic energy, or with that kinetic energy required to cause a dent 2.5 mm deep, whichever is least. 

A container of hydrogen at 2 bar at 27 F is damaged causing a 1 cm" sharp-edged opening What is the rate of hydrogen discharge into the atmosphere ... 

A tank of benzene (specific gravity 0.88) pressurized to 2 bar (1 bar above atmospheric) is damaged causing a 10 cm sharp opening located 2 m below the liquid level. What is the discharge rate... 

Impact damage Damage caused to lungs, surfaces of ductwork, or fans by particulate matter. 

When specifying compressor packages to API 1 IP, it may be necessary to specify certain sections of API 618 to ensure satisfactory installations. An example of this would be the supply of multiple compressors to be located in pipeline booster stations. In this case, an analog or digital pulsation and vibration study per API 618 Section 3.9 would be advisable to improve reliability and to minimize system problems and potential damage caused by gas pulsations and interaction between the individual compressor packages. 

Table 6.10 presents some damage effects. It may give the impression that damage is related only to a blast wave s peak overpressure, but this is not the case. For certain types of structures, impulse and dynamic pressure (wind force), rather than overpressure, determine the extent of damage. Table 6.10 was prepared for blast waves of nuclear explosions, and generally provides conservative predictions for other types of explosions. More information on the damage caused by blast waves can be found in Appendix B. 

The Chemical Process Industry (CPI) uses various quantitative and qualitative techniques to assess the reliability and risk of process equipment, process systems, and chemical manufacturing operations. These techniques identify the interactions of equipment, systems, and persons that have potentially undesirable consequences. In the case of reliability analyses, the undesirable consequences (e.g., plant shutdown, excessive downtime, or production of off-specification product) are those incidents which reduce system profitability through loss of production and increased maintenance costs. In the case of risk analyses, the primary concerns are human injuries, environmental impacts, and system damage caused by occurrence of fires, explosions, toxic material releases, and related hazards. Quantification of risk in terms of the severity of the consequences and the likelihood of occurrence provides the manager of the system with an important decisionmaking tool. By using the results of a quantitative risk analysis, we are better able to answer such questions as, Which of several candidate systems poses the least risk Are risk reduction modifications necessary and What modifications would be most effective in reducing risk ... 

These procedures are used to minimize tlie damage caused by these accidents. 

TABLE 7.3.1 Damage Caused at Various Incident Levels of Themial Radiation"... 

Typical Damage Caused by Overpressmre Effects of an Explosion... 

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