MAGNATECH Pipeliner II 609A, Operating And Maintenance Instruction Manual

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9.0 USE OF WELD HEAD ON PREHEATED PIPE.
If the Pipeliner Head and Guide Ring are to be used on preheated pipe, precautions may
be required to prevent damage for preheats of 95º C (200ºF) or lower, no special action
is required. For preheat higher (especially if preheat temp is to be over 150ºC (300ºF) it
is necessary to use an oversize Guide Ring and spacers (adaptors) to create additional
air spaces between the Guide Ring/weld Head and hot pipe surface. We recommend
using a Guide Ring which is oversized compared to the pipe OD by 10cm (4”) – using
5cm (2”) spacers (adaptors) attached to each of the square tubes of the Guide Ring.
This will increase the radial distance required for welding. We recommend that the
heating coils be wrapped with insulating material to minimize heating of the Head and
Guide Rings.