Class A Ovens And Furnaces

Chapter 11 class a ovens and furnaces 11 1 general.

Class a ovens and furnaces.

An oven or furnace that has heat utilization equipment operating at approximately atmospheric pressure wherein there is a potential explosion or fire hazard that could be occasioned by the presence of flammable volatiles or combustible materials processed or heated in the furnace. A 1 1 explosions and fires in fuel fired and electric heat utilization equipment constitute a loss potential in life property and production. Efficient safe easy to use. Industrial ovens and industrial furnaces in batch and conveyor configurations for thermal processing applications such as annealing curing drying heat treating sterilizing burn in and testing.

11 7 low oxygen atmosphere class a ovens with solvent recovery. The tfd class a walk in oven is specifically designed to meet nfpa 86 requirements. Whether you have a direct gas fired furnace or an electrically heated industrial oven understanding and following the nfpa 86 standard for ovens and furnaces can minimize the risk of a catastrophic event at your plant. Reserved 11 4 commissioning operations maintenance inspection and testing.

Known for tighter temperature tolerances higher yields and consistent repeatable results. This additional equipment is sized based on the volume of solvent being evaporated and the maximum operating temperature. Nfpa 86 2019 pertains to class a class b class c and class d ovens dryers and furnaces as well as thermal oxidizers. Order additional factory installed options for our heratherm and vacutherm lines.

And any other heated enclosure used for processing of materials and related equipment. 11 6 safety ventilation for class a ovens. An oven with an interior volume of 100 ft3 and exhaust ventilation of 125 ft3 min would require 3 2 min purge time 100 ft3 x 4 400 125 3 2 min. The large size and maximum 343 650 temperature of the tfd walk in ovens make these models a perfect choice for curing and drying large size or large batch components.

This purge period must be long enough to get at least four air changes of interior volume. In order to keep flammable vapor concentration at safe levels class a ovens include additional equipment to provide safety ventilation. Class a ovens must have a purge period before the heat source can be energized. Ovens are separated by class per nfpa 86.

From ovens and furnaces to dryers and thermal oxidizers a piece of equipment that breaks down hazardous gases to fend off air pollution many machines fall under the support of nfpa 86 2019. This standard shall apply to class a class b class c and class d ovens dryers and furnaces. Nfpa 86 defines ovens for these applications as class a ovens. Reserved 11 2 location and construction.

Reserved 11 3 heating systems.