Anderson - Snow Corporation offers a coil that solves this problem! ANSCOR has developed a coil fabricated from 5/8" O.D. x .049" wall type 304 or type 316 Stainless Steel tubing and .010" thick Copper flat plate fins. Fin spacings are available from 4 to 14 fins per inch, with a fin thickness of either .010", .016" or .025". This heavy fin is available in Copper, Aluminum, Type 304 or Type 316 Stainless Steel, Monel, Carbon Steel and Cupro-Nickel. The heavy wall 5/8" O.D. tubing used in conjunction with this fin is also available in the above materials. This heavy fin can take more abuse without the fins collapsing. The wide fin spacing also makes plugging less likely to occur. The heavy wall Stainless Steel tubing offers a fully welded tube to header joint. The coil is available in 1, 2 or 3 rows, either standard steam or steam distributing (tube within a tube type) coils.