Radiant tubes flame impingement, avoidance

Take a distance of about 20 ft between tube banks. A rough guide to furnace dimensions is a requirement of about 4 cuft/sqft of radiant transfer surface, but the ultimate criterion is sufficient space to avoid flame impingement... 

Perhaps the best and cheapest solution is to avoid flame impingement on radiant tubes. The 1250 to 1300°F temperature needed to melt the eutectic of vanadium-sodium is above the normal tube temperature in most heaters. However, flame impingement can easily raise the exterior surface of a radiant tube above 1250°F. 

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See also in sourсe #XX -- [ ]

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