Quadrol MRP EH

This systems is dedicated to expand the tubes wherever it is necessary to minimize tube elongation and its related stress for obtaining a perfect homogeneous contact between tube and tube-sheet along the entire expansion length.

The Quadrol MRP-EH is available in two models:

• Quadrol MRP EH 35 - For external tubes diameter range up to 31,8 mm (1.1/4")
• Quadrol MRP EH 100 - For external tubes diameter range up to 57,1 mm (2.1/4")

Parallel rolls tube expansion

Traditional tube expanders have a “feeding angle” which, due the friction between the tube and rolls, generates an “auto-feeding” of the conical part of mandrel with the consequent expansion of the tube. The “auto-feeding” cannot be controlled, therefore it generates stress on the wall of the tube to be expanded.

On the contrary with “Parallels Rolls” tube expanders, the feeding of the mandrel is hydraulically controlled by a system , regulated by the equipment QUADROL MRP-EH. Since the mandrel feeding speed is controlled ( it can be reduced or increased independently from the rotation of the mandrel ) the result is high reduction of the stress of the expanded tubes. The working time is reduced: mandrel feeding speed can be increased during the first part of the expansion and reduced only during the final part of the expansion, once the tube wall thickness is effectively reduced.