By W.O.E. Korver
The measure of possibility within the surroundings of a harmful situation should be made up our minds sooner than settling on a suitable electric apparatus install. If greatest defense is the essential think about identifying the kind of electric installations, the price of electric gear might be tremendous excessive. If cost-effective of electric deploy is the important issue, security to body of workers and kit could be unacceptably low. it really is, for this reason, essential to discover a aspect of stability at which the associated fee and defense requisites are either chuffed and applicable.
In 9 out of ten instances, a damaging situation is assessed a lot too conservatively. the cause of this conservative strategy is a scarcity of information and a false impression of the particular inspiration of security and hazard. This ebook offers an in-depth figuring out of the standards that impact the type of a dangerous place. One issue, together with a number of different components, can have an impression at the point of risk and its harmful limitations. those elements and their affects are defined intimately, and as soon as their influence is known, the class of a unsafe situation turns into an easy technique.
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Additional resources for Classifying Explosion Prone Areas for the Petroleum, Chemical and Related Industries
Increase in wear is normally caused by excessive operations. The rate of wear is generally accelerated by high temperatures and high pressure in the system. Increasing wear will reduce life expectancy and eventually cause leakage and/or breakdown of the equipment. For example, valves being used for a prolonged period of time in a piping system for which classification is required, may start leaking when they are subjected to excessive opening and closing cycles. The same is true for piping systems with threaded fittings which are frequently screwed tight and unscrewed for the transfer of flammable liquid from a fixed container to a removable container, such as in loading docks.
When a "remote" ignition source is involved, the area between the source of hazard and the remote ignition source must be classified Div. 1. This is only true if the flammable gases or vapors in the area have not reached safe concentrations before contacting the remote ignition source. If the flammable gas or vapor has reached safe concentrations before contacting the remote permanent ignition source, then the area need not be classified Div. 1. To avoid a possible explosion as a result of a remote ignition source, it is necessary to maintain sufficient distance between the source of hazard and the remote ignition source.
1 OCCASIONAL RELEASE NOT SUFF. VENTILATED TABLE B B1 -B5 CLOSED SMALL OR LARGE NO DIV. 2 OCCASIONAL RELEASE SUFFICIENTLY VENTILATED TABLE A OPEN ANY SIZE YES UNDER VENTILATION FAILURE DIV. 1 CONTINUOUS RELEASEOF FLAMMABLE VAPORS TABLE D D-2 CLOSED ANY SIZE MAY UNDER VENTILATION FAILURE DiV. 1 FREQUENTLY WORKEDOR OPERATEDON EQUIVALENT TO C-9 OUTDOORS A A r 10 (5) . OPERATING MODEOF SOURCEOF HAZARD CONDITIONSOF HAZARDOUS LOCATIONS FOR WHICH CLASSIFICATION IS REQUIRED ,,,, . I Ill 0 T A B L E 1-3 SUMMARY OF CONDITIONS FOR WHICH NEC CLASS I LOCATIONS MUST BE CLASSIFIED ITEM NO.