Process conditions: how are primary and secondary release sources classified?
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May I ask how the release sources for the feed inlet and discharge outlet of the reactor are defined? For example, if materials containing an ethanol solvent are manually fed into the centrifuge, and the discharge outlet of the tank is connected using a bucket directly, then the material discharged will be those containing the ethanol solvent According to the Code for Design of Electrical Installations in Explosive Atmospheres, as shown in the figure below, I would like to ask first whether these two stages can be considered normal operation? Secondly, are these two stages considered level one or level two? I would also appreciate your valuable advice!
Classify it as a primary emission source; use local exhaust ventilation to control the explosion-proof zone in the area near the openings. The entire workshop should still be classified as Zone 2 for explosion protection
Are both feeding and discharging treated as Class 1 release sources? I heard from the instrumentation that it seems their specifications don’t address how to design a Class 1 release source. It seems that electrical systems can also have their explosion-proof classification reduced by adopting measures such as local exhaust ventilation.
I’m sorry, OP; I can’t answer your question, but the definition posted is incorrect.
Regardless of the release source level, it is necessary to determine the explosion-proof area level; if it is Explosion-Proof Zone 1, then the design will be carried out accordingly. Level 1 is not difficult to design; electrical explosion protection meets the requirements. The instruments are the same.
Let’s first look at the definitions of the various terms: A release source refers to a location or point that may release combustible gases, mists, or liquids into the atmosphere, thereby creating an explosive mixture. Every processing equipment, such as tanks, pumps, pipes, containers, etc., should be regarded as a potential source of release of flammable substances. Continuous release source: A source that releases substances continuously or is expected to release them over a long period of time, with frequent releases over short intervals. Level 1 release sources: Sources that are expected to release substances periodically or occasionally during normal operation. Level 2 release source: Sources that are not expected to release under normal operation, and if release does occur, it is only occasional and short-lived. From above, the level of the release source is primarily determined by the release frequency and duration. The feed port and discharge port are release sources that discharge periodically or occasionally, and are classified as primary release sources. The centrifuge should be a continuously staged release source. In practice, there are both single-level emission sources and combinations of two or more.