The principal use of AX HEAT TRANSFER sections is for the cooling of strong sulfuric acid in its manufacture or handling. Gray cast iron of close grain structure has proven itself over the years to be the ideal material for this service, inexpensive, rugged and adaptable.

Compared to stainless steel, cast iron has the distinct advantage of surviving higher metal temperature and acid velocity, limits on which must be closely observed with the more expensive material, even with the electronic protective devices utilized to prevent rapid attrition. Just as critically important is cast iron's resistance to chloride attack which is a sensitive problem area with stainless steels. In the case of sea water for coolant, extra protection in the form of paints or coatings can be provided on AX HEAT TRANSFER sections, which, along with gasketless (push nipple) connections make the sections the only reliable choice for the conditions. Cast iron has proven demonstrably superior to other recent types of coolers utilizing tiny tubes of inert (TFE) plastic which unfortunately is an excellent insulator and has very little tensile strength, resulting in passage sizes incompatible with types of flows and fouling problems normally encountered in acid plant service.

AX HEAT TRANSFER AX sections have an internal area of 6.73 square inches compared to an I.D. of the TFE tubes of .08 inches, and a minimum wall thickness of 1/2" compared to .01", and unit strengths of cast iron is so much higher than plastic that they are not in the same order of magnitude.

The very nature of the standard modular concept of AX HEAT TRANSFER acid coolers makes for ease of maintenance with a minimum of downtime and expense and the innate ruggedness of the thick walled cast iron sections provide a "forgiveness" factor in operation not available elsewhere. At such time as replacements may be required they are always immediately available.


AX HEAT TRANSFER Condensing and Cooling Sections are used extensively in the following types of plants and are suitable for either submerged or sprayed service in any of the process industries:

  1. Sulfuric Acid plants
  2. Coke and Coal Tar By-Product Plants
  3. Natural Gas Reforming Plants
  4. Manufactured Gas Plants
  5. Chemical Plants
  6. Petroleum Refineries
  7. Fat and Oil Extraction Plants
  8. CO2 Plants
  9. Steam Power Plants
  10. Diesel or Gas Engine power Systems
  11. Heat Treating Plants
  12. Wood Preserving Plants
Comparison with Shell and Tube H2SO4 Coolers
Design Features of Sections
Push Nipple Sections
Installation Advantages
Physical Characteristics
Type of Installations