Airetool Tube Cleaner and Expanders Catalog - Tecno Italia s.r.l
Airetool Tube Cleaner and Expanders Catalog - Tecno Italia s.r.l
Airetool Tube Cleaner and Expanders Catalog - Tecno Italia s.r.l
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Five roll exp<strong>and</strong>er vs. Three roll exp<strong>and</strong>er<br />
Setting the tube exp<strong>and</strong>er’s collar<br />
Double <strong>Tube</strong> Sheet Application<br />
<strong>Airetool</strong> Heat Exchanger – Condenser Exp<strong>and</strong>ers<br />
Many manufacturers prefer the five-roll exp<strong>and</strong>er for applications that use tube materials that work harden quickly such<br />
as stainless steel <strong>and</strong> titanium. Also used in applications with closely spaced tubes having triangular pitch. The five-roll<br />
exp<strong>and</strong>er inherently has more contact area with the tube than the three-roll. This extra contact with the tube reduces<br />
the amount of work hardening <strong>and</strong> spring back effect, which is common with these tube materials. The thinner the<br />
tube walls, 18 BWG (.049"/1.25mm) <strong>and</strong> thinner, the more apt this is to occur.<br />
It is very important to set the tube exp<strong>and</strong>er’s collar in the correct position<br />
inside the tube sheet to EL pinch point. The exp<strong>and</strong>er’s roll high point should<br />
be positioned away from the inner side of the tube sheet as shown in the<br />
figure below. The purpose for setting the exp<strong>and</strong>er’s collar this way is to<br />
allow for thermal expansion <strong>and</strong> contraction of the tube while it is in service.<br />
If the tube is exp<strong>and</strong>ed beyond the tube sheet, the thermal expansion <strong>and</strong><br />
contraction of the tube will cause stress on the tube, which may cause the<br />
tube to crack or rupture at the inner tube sheet location. When tightening<br />
the setscrew on the exp<strong>and</strong>er’s collar, be sure it is aligned with the cage<br />
grove.<br />
EXAMPLE ONLY<br />
In a double tube sheet application additional information is EXAMPLE ONLY<br />
required. The thickness of the outer tube sheet (primary tube<br />
sheet) <strong>and</strong> inner tube sheet (secondary tube sheet) <strong>and</strong> the<br />
distance between the two tube sheets must be shown. When<br />
exp<strong>and</strong>ing the tube in the primary tube sheet the exp<strong>and</strong>ers<br />
collar is positioned as in the figure above with an 800 series<br />
tube exp<strong>and</strong>er. For the secondary tube sheet a 1200 series<br />
exp<strong>and</strong>er is required with “S” type (double radius) rolls. The “S”<br />
type rolls are required to allow the exp<strong>and</strong>er to have clearance<br />
on each side of the secondary tube sheet. This is to reduce stresses in the tube due to thermal expansion <strong>and</strong><br />
contraction.<br />
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