Flow Block Mini 2

The Gastech Flow Block Mini 2 is a medium-pressure pipeline plugging and isolation machine for live gas and water pipelines from DN 3/4″ to DN 2″, rated to a maximum operating pressure of 5 bar. The system is constructed entirely in stainless-grade and heavy-duty metallic components — visible in the image as a compact gearbox housing body, central isolation spindle assembly, T-bar hand drive crossbar with rubber end grips, and a lower mechanical sealing head. The product is registered under the Flow Block® trademark and carries product code DA.2480.0050.0001. Pipe material compatibility covers steel, grey cast iron, ductile cast iron, and stainless steel across the DN 3/4″ to DN 2″ size range. The system is approved for use across gas, water, district heating, and petrochemical pipeline networks — making it one of the most versatile compact pipeline isolation tools in the Gastech special pipeline equipment range.

The Flow Block Mini 2 operates by inserting a mechanical sealing element directly into the live pipe bore through a pre-installed valve or service connection point — without requiring the pipeline to be drained or depressurized before isolation work begins. The T-bar hand drive rotates the spindle assembly to advance and deploy the mechanical seal against the pipe bore wall, creating a positive isolation barrier that stops flow through the section downstream of the plug. This allows repair, connection, or component replacement work to proceed on the isolated section while the pipeline upstream remains live and pressurized at up to 5 bar. The mechanical construction requires no compressed air, nitrogen bottles, or inflation equipment that balloon-type pluggers need — reducing field equipment requirements to the tool itself.

The Gastech Flow Block Mini 2 is deployed by gas and water network operators, utility contractors, and district heating maintenance teams for live-line isolation during service connection work, valve replacement, meter exchange, fitting repairs, and emergency pipe interventions on pressurized small-diameter pipelines — wherever shutting down the upstream supply is operationally or commercially unacceptable during the maintenance window.

Leader Infra supplies this medium-pressure mechanical pipeline isolation system for gas, water, district heating, and petrochemical network operators — enabling positive live-line isolation from DN 3/4″ to DN 2″ at up to 5 bar with no inflation equipment and no upstream supply interruption required.

FAQ — What is the operational advantage of a mechanical plug like the Flow Block Mini 2 over an inflatable balloon plug on a live gas pipeline? Mechanical plugs do not require any inflation medium — no compressed air cylinder or nitrogen bottle is needed on-site, removing the risk of inflation medium contamination entering the live gas pipeline. The mechanical seal is set by direct spindle rotation and holds a fixed, verifiable seating force independent of inflation pressure decay over time — making it a more reliable isolation method for extended maintenance windows on live gas networks where balloon deflation over time would create a safety risk.