The Reinforced Steam Pipe is a Steam Pipe encased in a shielding-alloy jacket, made for the one place ordinary pipes cannot survive: inside a working reactor room. A running reactor melts unprotected steam pipes there one at a time, roughly every 8 seconds, and melts them first the moment a meltdown starts; the Reinforced Steam Pipe carries the same #alaindustrial:meltproof tag as the reactor's own shielding shell, so it stays intact through both. Like the plain Steam Pipe, it moves only steam — 50 mB per tick, one bucket a second, along a 50 mB segment, with no energy cost — and never connects to a Fluid Pipe of either kind. It does connect to an ordinary Steam Pipe, continuing the same line. The body is the reactor casing's dark graphite, but the ribs and collar bands are brass rather than the Reinforced Fluid Pipe's teal, so a glance tells steam from water.

Six Reinforced Steam Pipes come from a 3×3 crafting grid: six Steam Pipes at the corners and edges, two Shielding Alloy Plates on the sides, and one Shielding Alloy Reinforced Plate in the center. The recipe unlocks once a player holds a Steam Pipe and both plates. In a working reactor, the Reinforced Steam Pipe carries steam from the top of a reactor column, through the Reactor Inlet, and out to an ordinary Steam Pipe feeding a Steam Nozzle — only the run inside the sealed room needs the reinforced version. A Reinforced Fluid Pipe that was carrying steam in an older world converts to a Reinforced Steam Pipe automatically on the first load after an update, so existing reactor plumbing keeps working without a rebuild.