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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.
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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.
USES
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:
- Sulfuric Acid plants
- Coke and Coal Tar By-Product Plants
- Natural Gas Reforming Plants
- Manufactured Gas Plants
- Chemical Plants
- Petroleum Refineries
- Fat and Oil Extraction Plants
- CO2 Plants
- Steam Power Plants
- Diesel or Gas Engine power Systems
- Heat Treating Plants
- Wood Preserving Plants
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