The NB series (Narrow body) clamshells are designed with a lower profile for reduced weight and increased functionality in confined work spaces. The series is comprised of 15 standard models covering a range from 2.0 in (50.8mm) to 36 in (914.4mm) OD.
The split frame design of them NB clamshell allows for installation of the machine at any point along a pipeline. These portable split frame machines accept a wide range of accessories to increase performance and expand capabilities. Accessories for the clamshells include sever slides, axial feed, single point, counterbore and swivel head modules.