Steel casing pipe
Media
Manufacturers
Technical specifications
Insulation: vacuum and wool or vacuum and cryogel
Other names: double‑jacketed pipe, LNG transfer pipe, LNG pipe, steel‑cased pipe‑in‑pipe
What is a steel casing pipe?
The steel casing pipe consists of the actual product pipe and the surrounding casing pipe. After installation, the space between the pipes is evacuated, which improves the thermal insulation. The phenomenon is based on the so‑called thermosiphon effect, where the vacuum prevents heat conduction between the pipes. In addition to the vacuum, insulation is present in the interspace to prevent heat transfer by radiation.
The product pipe is supported by the outer pipe with bearings, resulting in a relatively rigid structure. The pipe can be embedded directly into the ground without concrete pipe wells or, in crossings, a normally longer bridging span can be used.
Steel casing pipe selection
We assist with inquiries and procurement of a steel casing pipe that meets the requirements of your application. For more information, please ask our contacts.
For steam and condensate
A drawback of traditional steam and district heating pipes is their high heat losses over long transfer distances. FW-Fernwärme-Technik GmbH’s steel casing pipe achieves significant energy savings. Its heat losses are approximately 40–50% lower compared to a conventionally insulated steam pipe.
For cryogenic media
The triple-layer FW chamber steel casing pipe designed for cryogenic applications consists of a product pipe, a surrounding chamber pipe, and a protective pipe. The product and chamber pipes of the LNG pipe are made of austenitic stainless steel, thereby preventing cold transition. In ground installations, carbon steel is used as the outer protective pipe.
In addition to the vacuum, a cryogel bound to a fibrous mat is used as insulation. The pipe helps avoid condensation problems because, due to its excellent insulating properties, the outer surface of the outer pipe remains relatively warm. Furthermore, thanks to the vacuum, no condensing water is present in the space between the inner and outer pipes, so the insulation always remains completely dry.
There is insulation in the space between the inner pipe and the chamber pipe. The chamber pipe is supported by bearings on the protective pipe, allowing it to move freely during thermal expansion.