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DoubleTrac® is flexible, double-contained fuel pipework for generator systems, marinas and other fuel-transfer routes. Continuous coils and mechanically assembled fittings offer an alternative to fabricated welded steel pipe-in-pipe.
For above-ground applications, its UL 1369 listing provides independently evaluated product evidence, including a 120-minute fire rating and a separate Marine Use classification.
PFS Case Study - DoubleTrac - Dublin Commercial New Build Rooftop Genset Fuel Supply - 23-06-26.pdf
PFS_Product-Sheet_DoubleTrac.pdf
DBT-148-Rev-11-20.pdf
DBT 001UK-EU DI Guide June2025.pdf
DoubleTrac is a flexible fuel-piping system with built-in secondary containment. It is designed for specified above-ground, underground and marina applications, subject to the relevant manufacturer guidance.
Corrugated stainless steel carries the fuel. Field-assembled fittings form a metal-to-metal seal at the primary fuel connection.
A monitorable interstitial space sits between the primary pipe and the EFEP secondary barrier. Nylon 12 forms the protective outer jacket.
The outer layers are not a second stainless-steel pipe—an important correction to wording elsewhere on the current page.
DoubleTrac can simplify demanding routes without giving up secondary containment or documented fire performance.
Long coils can create continuous runs and reduce the number of site-made connections where the route allows.
Mechanically assembled fittings avoid welding when assembling the DoubleTrac pipe system.
The pipe can bend within its specified radius, reducing the need for some direction-change fittings.
Less on-site fabrication can shorten installation. Results are project-specific; see the Dublin generator case study.
UL 1369 addresses above-ground piping for flammable and combustible liquids, including fuel supply to generators and additional evaluation for marina use. DoubleTrac's listing identifies a defined pipe-and-fitting system—not just a grade of stainless steel.
Why that matters: specifiers can examine independent product evidence covering fuel compatibility, pressure and leakage performance, physical and mechanical stresses, environmental exposure and fire performance, rather than relying only on material properties or a manufacturer's general suitability statement.
The UL listing report records a 120-minute rating for the listed above-ground DoubleTrac system under defined test conditions.
The listing separately identifies marina use, with the route and installation still subject to manufacturer requirements.
A product fire rating is not a guarantee of how every completed installation will perform in a fire, and UL listing does not replace applicable UK or Irish project requirements. Read the UL report extract.
Fuel feed and return lines may need to connect bulk storage with day tanks or generator equipment through plant rooms, risers and external or rooftop spaces. These are routes where continuous lengths, fewer welded joints and built-in secondary containment can be particularly useful.
DoubleTrac also gives the project team defined above-ground fire-performance evidence to consider alongside its fuel, pressure, flow, monitoring and installation requirements. See the PFS rooftop generator project for a real installation example.
Marina fuel routes face outdoor exposure and, in some arrangements, movement between structures. DoubleTrac has a UL 1369 Marine Use classification for fixed, semi-fixed and floating docks. OmegaFlex reports additional tidal-cycle evaluation involving 10,000 pressurised bending cycles.
Its flexibility and secondary containment can be useful along appropriately designed docks. Shore-to-dock transitions and floating-gangway arrangements need project-specific assessment; the Marine Use rating is not blanket approval for every route. Read OmegaFlex's marina guidance.
Start with the UK/EU design and installation guide for local operating parameters, including the updated UK/EU pressure ratings. Use the drawings and specification resources as project-documentation starting points, checking them against the actual installation.
Tell us the application, fuel, proposed route and pipe sizes. PFS can help you identify the relevant DoubleTrac products and manufacturer information, and provide project pricing.
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