BOILER TUBE EXPANDERS

SERIES 28 EXPANDERS

Three Roll - Self Feeding - Flaring Type
Series 28 Expanders
Series 28 Expanders

Features
  • Three Roll
  • Self Feeding
  • Flaring Type
  • Non-Parallel Expansion
  • Flaring type to 3/4-Inch Tubesheet

The Model 28 expander features three flare rolls and three straight self retained rolls. The use of this expander simultaneously flares the tube as a preliminary to beading operations. The revolving thrust collar sets the tube and is notched to clear adjacent tubes if on close centers. Ideal for most HRT and other fire tube boilers. The self retained roll feature also makes this expander a popular one for far end rolling when used in conjunction with reverse mandrels and extension drives.
 
Tube Assembly
with Mandrel
Part No. 		Spares Reverse Taper Mandrel Expansion
Range*
Inches
OD Wall Standard Mandrel Roll Set Part No.
Inches (mm) GA (mm) Part No. Square Part No. Square
Inch (mm) Inch (mm)
2 (50.8) 10-16 (3.4-1.7) 35004 35024 3/4 (19.1) 35037 20766 1/2 (12.7) 1.687-2.000
2-1/2 (63.5) 35008 35026 35040 20769 3/4 (19.1) 2.156-2.500
3 (76.2) 35012 35028 1 (25.4) 35043 20772 1 (25.4) 2.625-3.000
* Expander range is taken at front of thrust collar.

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