‘1A’ Type
(3 roller, single belling roller type)
This is a Single Belling Roller Expander, suitable for high and low pressure steam generating installations. The flare angle is 300 inclusive. Extended mandrels and sets of short mandrels can be supplied. When ordering it is important to show your tube plate thickness and other details that relate to the expanding conditions, i.e., hand hole sizes, drum and header diameter etc.
Description
(3 roller, single belling roller type)
This is a Single Belling Roller Expander, suitable for high and low pressure steam generating installations. The flare angle is 300 inclusive. Extended mandrels and sets of short mandrels can be supplied. When ordering it is important to show your tube plate thickness and other details that relate to the expanding conditions, i.e., hand hole sizes, drum and header diameter etc.
Order Instructions
To ascertain the correct tool number for your purposes, first establish the minimum bore which the tool enters (1st column of table below). Then select the appropriate Seat Thickness column, and read off at the Minimum Bore size line… e.g. for a tube with minimum bore size of 40mm and a seat thickness of 35m the tool number will read: 1A40/35.
Intermediate range tools are available to special order.
Drum mandrels will be supplied unless header or short series mandrels are ordered.
Note: In all cases the effective parallel rolling lengths of these tools is 9mm longer than the seat thickness dimensions given in the tables. Where it is necessary to expand in seats which are thicker than those covered below, the recommended procedure for rolling in thick drums applies.