The HEXPANDER provides manufacturer’s of large heat transfer coils a lower cost and efficient means of expanding their coils. While large multi-rod horizontal expander can expand large coils in one cycle, they involve both a larger capital investment and costly time-consuming setup procedures. Other tube expansion methods, such as hydrostatic and hydro-propulsive expansion, although adequate for some coil manufacturers, have disadvantages. Problems such as inconsistent tube-to-fin bond, ruptured tubes, and the extra cost for secondary cleaning and/or drying of the coil tube interiors tend to limit their value or preference.
Some of the Major Advantages of the HEXPANDER are as follows:
PRECISE CONTROL OF THE AMOUNT OF FIN-TO-TUBE BOND, when compared to hydraulically expanded coils.
VIRTUALLY NO LIMITATIONS ON THE LENGTH OF THE COIL TO BE EXPANDED, when compared to multi-rod expanders – horizontal or vertical.
VERSATILITY IN EXPANDING COILS OF DIFFERENT FIN PATTERNS, again when compared to multi-rod expanders and their costly tooling sets.
EXCELLENT CONTROL OF COIL DIMENSION, when compared other expansion methods, since the tube shrinkage rate is greatly reduced.
MINIMAL SECONDARY CLEANING & DRYING OPERATIONS, when compared to hydrostatic-types of coil expansion.
EASE OF CHANGE BETWEEN LONG & SHORT FINNED LENGTHS, when compared to horizontal multi-rod expanders.
MODERATE COST, when compared to large horizontal multi-rod expanders.
Semi-Automatic – HEX Description
GENERAL MACHINE DESCRIPTION: The TRIDAN Model HEX-3(4) HEXPANDER is a hydraulically powered incremental-type horizontal mechanical tube expander designed for the expansion of heat transfer coils, which use straight tube and return bend construction. It is designed to expand up to six (6) tubes per cycle (dependent upon center-to-center dimension) made of copper or aluminum, and other thin wall materials having outside diameters between 3/8″ (9.53mm) and 3/4″ (19.1mm). Note that since the HEXPANDER expands multiple tubes during its operational cycle with these tube centers being co-linear in the same row, hairpin tube construction cannot be used. The maximum finned length expandable is 159″(404cm) for the Model HEX-3(4)-13, 255″(648cm) for the HEX-3(4)-21, and 300″(762cm) for the HEX-3(4)-25.