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Flexible, double-contained stainless-steel fuel pipework
DoubleTrac® is a flexible pipe-in-pipe system built around a corrugated 316L stainless-steel primary fuel pipe, with a monitorable interstitial space, EFEP secondary barrier and UV-stabilised Nylon 12 outer jacket. Supplied in continuous coils with mechanically assembled fittings, it provides a complete alternative to fabricated welded steel pipe-in-pipe.
Explore solutions for generator systems, automotive manufacturing and engine-test facilities, commercial and fleet refuelling, forecourts, heating-oil systems, terminals, aviation, rail and marinas.
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 creates long, flexible fuel routes with fewer site-made connections. Its mechanical fittings assemble without welding, so no hot works are required to join the DoubleTrac pipe and fittings.
Installation is faster and cleaner, complex routes are easier to negotiate, and the continuous interstitial space provides the foundation for permanent leak monitoring.
A corrugated 316L stainless-steel primary pipe carries the fuel. A continuous interstitial space enables leak monitoring, while an EFEP secondary barrier and UV-stabilised Nylon 12 jacket provide secondary containment and robust external protection.
Continuous coils minimise intermediate fittings, reduce potential leak paths and speed up installation across long routes.
Mechanical fittings create a secure metal-to-metal fuel connection using standard installation tools—without welding the pipework.
The flexible pipe follows changes in direction, reduces the need for elbows and makes constrained or complex routes easier to install.
The continuous interstitial space connects to pressure, vacuum or sensor-based leak detection for permanent system monitoring.
DoubleTrac provides one versatile pipework platform for pressure and suction fuel supply, return lines, tank filling, vent pipework, recirculation and vapour-recovery routes across a wide range of fuel-handling industries.
Ideal for data centres, hospitals, telecommunications facilities, commercial buildings, high-rise developments and industrial sites where reliable generator fuel delivery is critical.
Continuous pipe lengths, secondary containment and installation without hot works make DoubleTrac particularly well suited to live production environments where safety, cleanliness and uptime matter.
Listed to UL 1369 for above-ground use and UL 971A for underground use, DoubleTrac enables one continuous pipe family to transition between buried and exposed sections of a route.
A strong choice for schools, prisons, MOD facilities, estates, larger private properties and other off-grid buildings that need dependable, secondary-contained heating-oil pipework.
The Marine Use evaluation includes tide-cycle testing, giving designers proven performance evidence for fixed, semi-fixed and floating-dock fuel routes exposed to repeated movement.
The DoubleTrac listing includes aviation fuels, bringing flexible routing, secondary containment and independently evaluated system performance to airport and airfield infrastructure.
Flexible routing and monitorable secondary containment make DoubleTrac a practical solution for complex transfer routes where environmental protection and operational reliability are priorities.
DoubleTrac brings fast installation, fewer joints and monitored double containment to fixed rail-depot fuel infrastructure and difficult storage-to-dispensing routes.
DoubleTrac combines a UL 1369 above-ground listing with a UL 971A underground listing. That gives designers and installers one flexible, secondary-contained pipe family for routes that move between buried sections, plant rooms, risers, rooftops and dispensing equipment.
ANSI/CAN/UL/ULC 1369 is the dedicated product-safety standard for factory-manufactured above-ground piping used to transfer flammable and combustible liquids. It evaluates the complete pipe-and-fitting system across pressure integrity, secondary containment, mechanical strength, environmental exposure, fuel compatibility and fire performance.
This system-level approach goes far beyond specifying a material such as stainless steel. It demonstrates how the assembled DoubleTrac system performs under the real mechanical, environmental and fire challenges encountered by above-ground fuel pipework.
UL 1369 provides one of the most comprehensive independent assessment frameworks available for above-ground fuel pipework. It tests the complete manufactured system—not simply the pipe material—across the performance areas that matter most on a fuel installation.
UK and European standards cover important parts of the picture: BS EN 13480 addresses metallic industrial piping design and construction, while EN 14125 covers underground fuel pipework at filling stations. There is no directly equivalent BS or EN product standard that brings together the same breadth of pressure, functional, physical-abuse, environmental, fuel-compatibility and fire testing for a factory-manufactured above-ground fuel pipe-and-fitting system.
For UK and Irish projects, the UL 1369 listing gives specifiers, insurers and asset owners a powerful independent evidence base for selecting DoubleTrac over systems supported only by a material specification or general fabrication code.
UL 1369 subjects the complete pipe-and-fitting system to a broad programme of performance tests. Each group answers a practical question about how the system will perform throughout installation and service.
DoubleTrac carries a 120-minute UL fire rating, providing exceptional product-level evidence for fuel routes through buildings and critical infrastructure.
DoubleTrac carries a Marine Use classification covering fixed, semi-fixed and floating-dock arrangements, supported by documented tide-cycle evaluation.
UL evaluates the DoubleTrac pipe and fittings together as one complete system, proving performance beyond a generic pipe-material specification.
Independent certification under OmegaFlex file MH45578 gives project teams clear, traceable evidence backed by UL’s ongoing Follow-Up Service.
The result: a deeper and more complete evidence base for above-ground fuel pipework—covering the areas that matter to designers, insurers, contractors and asset owners.
DoubleTrac provides a continuous interstitial route between the primary fuel pipe and secondary barrier, enabling permanent pressure, vacuum or sensor-based leak monitoring across the pipework system.
Combined with clearly zoned alarms, the system can identify a loss of containment before fuel reaches the environment—strengthening environmental protection and giving operators faster, more precise fault information.
PFS can help match DoubleTrac with an SGB Class 1 pressure- or vacuum-based leak-detection system, using the pipe layout and operating information to identify the right monitoring arrangement for the project.
PFS helps contractors and project teams move from an initial pipe route to a complete DoubleTrac package, with the core products, technical information and installer support brought together in one place.
Core DoubleTrac pipework, fittings and installation components are stocked in the UK for responsive supply to projects across the UK and Ireland.
Pipe is supplied by the metre in continuous coils, cut to the required project lengths, then coiled and palletised for delivery and staged installation.
Source pipe, mechanical end fittings, entry fittings, installation tools, consumables and compatible leak-detection equipment through PFS.
Access fitting-assembly training, product-selection guidance, technical documents and project quotations from a team experienced in complete fuel systems.
The published PFS case study follows a demanding generator fuel route from basement bulk storage, through internal service areas and up to a rooftop day tank.
Continuous DoubleTrac runs carried fuel through service ducts, plant areas, external sections and high-level routes.
The contractor reported a substantially faster installation than its welded-steel comparison.
Reduced fabrication, fewer fittings and faster site work delivered a significant saving on the project.
PFS supplied the pipe in continuous coiled lengths with mechanical BSPT end fittings for assembly on site. Following fitting-assembly training, the installer pulled the flexible pipe through service ducts and supported it on the planned trays and brackets—without welding the DoubleTrac joints or bringing hot works to the route.
DoubleTrac is available in three core sizes. The figures below are the manufacturer’s maximum primary operating pressures and minimum bend radii from the UK/EU design and installation guide.
Access the UK/EU design and installation guide, product information, CAD drawings, BIM objects and written specification resources needed to take DoubleTrac from initial design through to installation.
The pipework, components and typical applications.
See the mechanical installation method.
A customer perspective on DoubleTrac in a marina environment.
Tell PFS the application, fuel, proposed pipe route, approximate lengths and sizes, operating pressure and preferred leak-monitoring approach. We can help identify the relevant DoubleTrac components and manufacturer information, discuss installer training and provide project pricing.
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