Stopping Machines for Pipeline Hot Tap Applications

Folding heads are built for specific pipe-to-valve combinations, so the right model depends on the pipe diameter and on the size of the branch fitting and valve it passes through. Pivoting heads are a size-on-size solution matched to the pipe. Schallert provides the specifications for each model on request and can recommend the right head for your line.

Folding head machines insert through a reduced branch fitting and unfold to seal larger pipe diameters, saving on valve and fitting costs. Pivoting head machines are a size-on-size solution suited to higher pressures and temperatures, making them ideal for hazardous gases and chemicals in mills and refineries.

Pressure ratings are specific to each model and component, including the head, sealing element, housing, jackscrew actuator, and plug setter. Pivoting heads are typically chosen for higher-pressure and high-temperature service, while folding heads offer a cost-effective option through reduced branch fittings. Schallert's team matches each component to the pipeline's operating pressure and provides model ratings on request.

Yes, select models such as the FH7248 Folding Head and FH1612 are available for both purchase and rental. Rental is a practical option for one-off or infrequent line stopping jobs, while purchase suits companies performing regular pipeline maintenance and repair work.

A full line stop operation typically requires a folding or pivoting head, a compatible housing, a jackscrew actuator to drive the head into position, a completion plug setter to finish the job, and line stop flanges or fittings for pipe access. Schallert manufactures all of these components to work together as a complete system.

Jackscrew actuators drive the folding or pivoting head into the pipeline through the housing until it fully seals the line. They feature a chrome bar with etched stroke measurements viewable through a porthole, and the stroke length and drive arrangement are matched to the pipe size and the head being used.