Best Practices For Expanding Water-Tube Boiler Tubes

2020-01-22T10:39:42-05:00

The American Society Of Mechanical Engineers (ASME) develops standards to provide consistency and ensure public safety and reliability. While these codes are not always required, they have been widely adopted and implemented across many industries. As a result, it is important to be knowledgeable and aware of these standards prior to beginning a job.

Best Practices For Expanding Water-Tube Boiler Tubes2020-01-22T10:39:42-05:00

Basic Principles Of Tube Expanding

2019-11-25T14:11:32-05:00

Tube Expanding is the art of reducing a tube wall by compressing the O.D. of the tube against a fixed container, such as rolling tubes into tube sheets, drums, ferrules or flanges. To assure a proper tube joint, the tube wall must be reduced by a predetermined percentage.

Basic Principles Of Tube Expanding2019-11-25T14:11:32-05:00

Is the free speed RPM of a torque control the best indicator of how fast a tube can be rolled?

2019-11-25T14:11:44-05:00

For tube expanding it is desirable to roll the tube quickly as it prevents work hardening of the tube and less frictional heat is generated. The limiting factors in this balance of speed vs. power are voltage or pneumatic pressure. These either limit the speed or power being produced.

Is the free speed RPM of a torque control the best indicator of how fast a tube can be rolled?2019-11-25T14:11:44-05:00

How To Prevent Tubes From Rotating When Rolling

2019-11-25T14:11:44-05:00

Tube rolling occurs when the tube rotates due to inadequate friction between the tube OD and the hole in the tube sheet. This can cause increased expansion times and decrease the efficiency of the operator. Increasing the friction between the tube and tube sheet and or collar the tube will not rotate within the tube sheet. Increasing the friction can be done using several different methods:

How To Prevent Tubes From Rotating When Rolling2019-11-25T14:11:44-05:00