Boiler Expanders

Tube expanding is the art of cold working the ends of tubes into intimate contact with the metal of the containing tube holes to form a leak proof mechanical seal and/ or joint. In other words, it is a mechanical method of establishing a mechanical joint between a tube and a tube hole. Boiler expanders do not include a mandrel when ordered because its possible to obtain them with three different types of mandrels depending on the application.

When selecting a boiler expander, you must know:

Tube O.D.
Tube wall thickness or BWG
Tube Sheet or drum thickness
Minimum straight section at end of tube
Drum diameter if less than 18"

This information will allow you to select the proper type of boiler expander and mandrels.

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Straight Roll Expanders

Our product engineers have designed an economical, yet durable Firetube boiler tube expander available for 2”, 2-1/2” and 3” O.D.Tubes with 10-14 gauge tube walls, non-flaring applications with 3/8” to 1” thick tube sheets. This unique design increases the expansion range for a given expander and includes a metal roll retainer that keeps the rolls in the expander’s cage when the mandrel is removed. Drum mandrel sets are available for specific applications and space limitations.

Firetube Flare Roll Expanders

Our Firetube Flare-Roll Series boiler expanders provide tube flaring capabilities, with a design that incorporates a thrust collar for torque-controlled tube rolling, roll retainers, and offset flare rolls. Available in tube sizes of 2”, 2-1/2” and 3” O.D. and 10–14-gauge wall thickness for tube sheets of 3/8” - 1” thick.

Specialty Boiler Expanders

EGI application engineers can produce a variety of applications specific to boiler expanders for your needs. Covering everything from sugar mill operations to nuclear applications.

Boiler Accessories & Technical Data

EGI can provide a broad range of ancillary accessories for boiler work ranging from parrel gear drives, right-angle gear drives, double universal joints, and drive extensions.

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