Unexpected start

The accidental or unexpected starting of electrical equipment can cause severe injury or death. Employees must not work near any part of an electric power circuit that they could contact during their work, unless protected against shock by de-energizing the circuit and grounding it or by guarding it effectively. 

Failure to adequately control energy accounts for many serious accidents in construction. Lockout/tagout procedures help safeguard employees from the unexpected start-up of machinery or equipment or release of hazardous energy while performing servicing or maintenance tasks. 

Hazards Deriving from Unexpected Start-up, Unexpected Overrun/Overspeed (or Any Similar Malfunction) from... 

A preventive maintenance program makes sure that tools, equipment, and machinery operate properly so that unexpected starts/stops or breakdowns do not occur. Effective preventive maintenance programs include adequate scheduling and reporting. If tools, equipment, or machinery fail or become defective, causing a safety hazard, it s important that they be corrected as soon as possible to prevent an injury. When failed equipment causes a safety hazard, an effective procedure that processes safety work orders is an important part of the corrective maintenance program. 

Unexpected start up, etc. Apparently it seems the task is not very difficult but in reality it needs experts view to foresee hazards and interactions are not so easily forthcoming. 

The safety function prevention of unexpected start-up of a movement of a linear or rotational axis with an incorrectly clamped workpiece of the standard prEN ISO 16090 (ISO 2013) was chosen to be analysed and quantified in order to keep the practical use of the researches. 

The selected safety function for 2.) is very similar to the safety function prevention of unexpected start-up of a movement of a linear or rotational axis with an incorrectly clamped workpiece of the standard ISO 16090-1. This safety function was chosen in another paper of Modden, Gunnel for ESREL 2014. Therein, the analysis of field data of real milling machines shows that a reliability between PL = a and PL = b is actually being achieved with state of the art design. This finding connects quite well theory and practice of state of the art milling machines. 

In ISO 13849-1 is not possible to take an occurrence probability explicitly into account. Very different from this, in lEC 62061 we have five levels available. As regards automatically controlled machines, especially the risk of unexpected start-up of a movement has to be taken into consideration in the context of the three-step-method of risk reduction of ISO 12100. Only then it is possible to estimate the occurrence probability that will be caused, if the SRP/CS fails. The intended use needs to be taken into consideration e.g. as regards the modes of operation (e.g. setup, manual or automatic working, maintenance). On the background of a kind of... 

Clear To prepare equipment by isolating and placing it in a safe condition to avoid injury or damage if equipment should unexpectedly start during the Try step. This includes removing and warning personnel. 

The accidental or unexpected sudden starting of electrical equipment can cause severe injuiy or death. Before ANY inspections or repairs are made (even on the so-called low-voltage circuits) the current should be turned off at the switch box and the switch padlocked in the OFF position. At tlie same time, the switch or controls of the macliine or other equipment being locked out of service should be securely tagged to show which equipment or circuits are being worked on. Lockouts and tagouts should be removed only by the individual(s) who installed them. 

Note, that the OCH2C=CH group in the alkyne starting material occupies an axial position. Why is this unexpected Offer an explanation. 

The unexpected source of starting material for partial synthesis i)f these agents was the sea. The isolation of 15CR)-PGA2 and its iicetate (44) from the lowly sea whip, Plexura homomalla, one of I he so-called soft corals, made an approach to prostaglandins rrom natural products possible. 

The substances involved in bioluminescence reactions are usually unstable. Thus, the extraction and purification of bioluminescent substances should be carried out in the shortest possible period of time, usually at a low temperature. It is known through experience that luminescent substances are almost always more stable in the original animal tissues than in extracts when preserved at a low temperature. Therefore, before starting extraction and purification, the stability of the extracts and purified substances should be investigated by carrying out a small-scale pilot experiment. A pilot experiment is also essential in the course of purification to avoid an unexpected loss of the target substance. If a component of the luminescence system is insoluble in common buffer solutions, it must be solubilized to purify it (see C1.3). 

A possible extension of the modified Neber reaction would be the synthesis of sulfonyl-substituted 2ff-azirines following the chemistry shown in Scheme 17 [27]. Unexpectedly, the oxime derived from -keto sulfones could not be converted into the oxime tosylate. Therefore, a different route to these requisite starting materials was designed, viz., via the corresponding sulfides 30 which were then oxidized with peracid to the sulfones 31. 

Recently, some hght was shed on these and other compounds as well as on their structures and properties. Today it may be considered that some of the mistakes made earher could have been avoided by the availability of elements or compounds of higher purity, and thereby have prevented the incorporation of unexpected impurities. In this context it is important to note some experimental principles of solid-state synthesis that should be considered In solid-state synthesis, great attention should be always dedicated to the purity of the starting materials, the purity of the container material (and gas atmosphere) used in the reaction, and the control and adjustment of the reaction conditions in order to finally obtain a high yield product... 

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