Page 10 of Airetool Tube Cleaners & Expanders by Cooper Power Tools

airetool heat exchanger ­ condenser expanders condenser/heat exchanger expanders airetool condenser heat exchanger expanders are selffeeding parallel rolling ball bearing thrust expanders they are available in standard sizes for 1/4 o.d through 3 o.d for tube sheets up to 6 3/4 thick other sizes and lengths are available upon request we supply most of the air conditioning manufacturers with expanders sixteen feet long the g-800 expanders are supplied with 1 1/2 or 2 1/4 long rolls for 1/2 o.d through 1 1/2 o.d tubes the g-1200 series is available with the same length rolls and for the same tube o.d but has a longer cage and mandrel the standard g-1200 with the 1 1/2 roll will expand tube sheet thicknesses from 1 1/2 through 5 while the g-1200 with 2 1/4 rolls will handle tube sheets 2 1/4 through 5 3/4 thick when you must expand thicker tube sheets the tool is available in the g-1200 type the g-900 expander is available with 3/4 rolls and 1 1/4 rolls for 1/4 o.d and 3/8 o.d tubes the g-1300 expander has 3/4 long or 1 1/4 long rolls for 3/8 o.d tubes in tube sheets through 3 1/2 thick airetool heat exchanger ­ condenser expanders five roll expander vs three roll expander many manufacturers prefer the five-roll expander for applications that use tube materials that work harden quickly such as stainless steel and titanium also used in applications with closely spaced tubes having triangular pitch the five-roll expander inherently has more contact area with the tube than the three-roll this extra contact with the tube reduces the amount of work hardening and spring back effect which is common with these tube materials the thinner the tube walls 18 bwg 049 1.25mm and thinner the more apt this is to occur to select the correct tube expander the following information is required tube od tube wall thickness or bwg tube sheet thickness tube material special conditions i.e double tube sheet tubes close to tube sheet channel tubes or protrusions long reach expanders are available upon request in 6 increments setting the tube expander s collar it is very important to set the tube expander s collar in the correct position inside the tube sheet to el pinch point the expander s roll high point should be positioned away from the inner side of the tube sheet as shown in the figure below the purpose for setting the expander s collar this way is to allow for thermal expansion and contraction of the tube while it is in service if the tube is expanded beyond the tube sheet the thermal expansion and contraction of the tube will cause stress on the tube which may cause the tube to crack or rupture at the inner tube sheet location when tightening the setscrew on the expander s collar be sure it is aligned with the cage grove example only collars tube sheet channel double tube sheet application thrust collar tube tube expander tube sheet flip collar 800/1200 series tube expanders are supplied with a flip collar with a 10-32 unf auto-lube port the flip collar allows for flush and recessed tube rolling the standard expander is supplied with a recess of 1/8 3 mm other recess lengths are available contact customer service for details 5 roll expanders do not have flip collars small diameter thrust collar small diameter thrust collars are recommended for rolling tubes in confined areas thin wall thrust collar thin wall thrust collars are recommended when expanding 20 bwg .035 0.9 mm or lighter wall tubes this design limits the possibility of the tube being drawn up inside the thrust collar removing the collar s collet allows the expander to be used as a full recess style compensating for various length tube projections from the tube sheet adjustable recess thrust collar the adjustable recess collar accommodates tube projections up to 1/2 12.7 mm from the tube sheet in a double tube sheet application additional information is example only required the thickness of the outer tube sheet primary tube sheet and inner tube sheet secondary tube sheet and the distance between the two tube sheets must be shown when expanding the tube in the primary tube sheet the expanders collar is positioned as in the figure above with an 800 series tube expander for the secondary tube sheet a 1200 series expander is required with s type double radius rolls the s type rolls are required to allow the expander to have clearance on each side of the secondary tube sheet this is to reduce stresses in the tube due to thermal expansion and contraction 16 17

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