Danger potential

The above example is simply one of the safety problems that must be faced with the completion of wells drilled with air (or gas) and making formation gas. The principle behind the above procedure is to eliminate or limit the exposure of the rig floor to the dangerous, potentially explosive formation gas. 

Catecholamine neurotransmitters are subsequently inactivated by enzymic methylation of the 3-hydroxyl (via catechol-O-methyltransferase) or by oxidative removal of the amine group via monoamine oxidase. Monoamine oxidase inhibitors are sometimes used to treat depression, and these drugs cause an accumulation of amine neurotransmitters. Under such drug treatment, simple amines such as tyramine in cheese, beans, fish, and yeast extracts are also not metabolized and can cause dangerous potentiation of neurotransmitter activity. 

Allopurinol prevents the oxidation of mercap-topurine to an inactive metabolite if an ordinary dose of mercaptopurine is given to a patient whose gout is being treated with allopurinol, dangerous potentiation occurs (see also azathiopurine, p. 292). 

Small quantities of adrenaline, such as are present as an additive in local anesthetic formulations, can be dangerously potentiated by beta-adrenoceptor blockers propranolol should be discontinued at least 3 days in advance of administering such products for local anesthesia. A combined infusion of adrenaline and propranolol has been used for diagnosing insulin resistance, but it can evoke cardiac dysrhythmias, even in patients without signs of coronary disease (17). 

Monoamine oxidase inhibitors can dangerously potentiate the hjrpertensive effects of ephedrine (38). 

A serious relapse of Parkinson s disease can occur after withdrawal. The most dangerous potential consequence is a syndrome identical to the neuroleptic mahgnant syndrome, with hyperthermia, semistupor, rigidity, and tremor, after withdrawal of levodopa (53,54). 

The shaman] Jose explained that he must master the forces of both the left and the right and he never spoke of the left side as a locus of evil powers for him, it was the field of life-threatening powers, with no explicitly stated moral evaluation... Jose described the ritual sessions as dangerous, potentially fatal encounters with life-threatening powers. He even told of other curers, with less powerful altars and careless ritual habits, who had lost their lives when they confronted potent sorcerers. On the other hand, Jose also commented on the aesthetic and pleasurable elements in the sessions. 

The safety system of the refinery is called AES and has been applied to units with high danger potential in addition to the usual shut down system. The AES system was developed originally for use in steam crackers and ethylene plants, and is initiated using both simultaneously pressing and turning a switch. 

When an earth fault occurs at the far end of a cable it is possible that the armouring, cable gland and the frame of the consumer equipment can be raised to a dangerous potential with respect to electric shock exposure to human operators. This subject has been given considerable attention over the last 20 years, and is well documented in for example IEC60364. The international documentation concentrates on low voltage fixed and portable equipment protected by fuses and miniature circuit breakers. See also Chapter 13. 

Vigran IM. Dangerous potentiation of meperidine hydrochloride by paigyline hydrochloride. 

NPP Safety versus Radioactive Waste Management. The basic danger potential of nuclear power plants and radioactive waste repositories is similar the threat of leakage of radioactive materials into the biosphere. Thus, there are some similarities in the safety approaches, too. For example, the safety objective in both areas is achieved as long as the radioactive materials are confined. When high reliability in confinement is required the multiple barrier principle is a natural solution. The differences between nuclear power plant safety and repository safety will be discussed in greater detail later in this paper. 

Source of Danger, Danger Field, Danger Potential, and Potential of Endangerment... 

The danger potential of a technical system equals the upper limit of its combined potentials of endangerment. 

Severe accidents in installations of considerable danger potential are rare occurrences for which a sufficient number of observations is not possible. 

The legislature has taken into consideration the necessity for relativity in the field of loss prevention by graduating the possibility for intervention on the part of the authorities according to the installation s danger potential (hazard potential) or its intended use. 

Before or simultaneously to the chemical lesion induction, these very concentrated corrosives can cause a ceU necrosis by dehydration and/or by thermal effect. Once more, this justifies the necessity to wash as soon as possible and to optimize the decontamination. This includes washing and physical mechanical rinsing in a better control of the dangerous potential degradation products of the chemical reaction. 

Measures to prevent shock by direct contact are in section 412 and subsections 471-04 to 471-07 and include the insulation of live parts, the use of barriers, enclosures and obstacles, and placing out of reach. The intention is to prevent any part of the body coming into contact with live parts at dangerous potentials. Subsection 412-06 refers to back-up protection by means of a sensitive RCD. This does not prevent but mitigates the effect of an... 

In those situations where testing must be done with the conductors live, the most important requirement is that the tester is protected against direct contact with those conductors energised at dangerous potentials. There are two main ways in which this can be achieved ... 

The neurologic examiner should always personally check the pulse (it only takes a minute). Aging patients can have an unrecognized tachycardia or arrhythmia, potentially dangerous, potentially quite treatable. A number of times we have found a previously undetected atrial fibrillation or other arrhythmia, or a pulse >90 BPM, and even >110 BPM. 

New classes—Im, 2m, and 3r— will further delineate the danger potential of medical and industrial lasers. Laser energy is light energy. Consider all Class 3 and Class 4 lasers as nonionizing, which indicates that laser energy does not cause molecular changes to tissue of the operator or others in... 

The dangerous potential of two-phase systems (bubbles with combustible gas mixture-i-liquid) to maintain explosive mode propagation is manifest when the system is subjected to a blast wave with a significant amplitude. Thus, the explosion propagates through the water filled with bubbles containing 2H2 + O2 stoichiometric mixture when the system is subjected to a blast load of AF = 50-60 MPa. As this takes place, the bubble volume concentration should not be less than shown in Fig. 5.21. An increase in the liquid viscosity causes a decrease in the blast load that promotes the bubble detonation. A six-time increase in the liquid viscosity in comparison to water, results in nearly twice the decrease in the critical blast pressure. 

---