Clamshell or Split Frame Pipe Cold Cutting & Beveling
OD Mount Pipe cutting Tools are a great method of cold cutting pipe insitu. The Clamshell /split frame comes as a 2 pieces that connect together forming a full circumference ring that mounts using adjustable feet.
Typically clamshells cover a narrow range of pipe diameters 4” – 6” below its actual size. Ie a 16” clamshell will mount down to 10” OD Pipe. It should be noted that the size selection should be kept as close as possible to the pipe OD to give the most accurate finish.
The clamshell works like a rotary lathe, with 2 tools / bits rotating around the OD of the pipe being drawn inwards to the pipe center on each pass. This operation allows for cutting and beveling in a single operation under certain circumstances. Square Cutting, Beveling (including compound), and counter boring finishes can all be completed with this tool.
Out-of-Round Chasers and Counter Boring tools are available as options. The Counter Boring tool can also be used for OD Flange facing as well.
Clamshells also come with Pneumatic, Electric, and Hydraulic motor options. Pneumatic motors are most common, with Hydraulic being preferred for sizes larger than 18”. The Mactech Line of Clamshells covers you from 2” up to 110” in diameter.