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Flexible • Fire-Rated • Secondary-Contained Fuel Pipework
DoubleTrac® Pipework for Diesel, HVO & Critical Fuel Transfer Systems
A premium double-wall flexible fuel transfer pipework system for backup generators, refuelling systems, marinas, commercial buildings, plant rooms and demanding in-building fuel routes.
Technical Downloads
Specifier Resources
Watch Videos
View Case Study
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DoubleTrac® is a premium double-wall flexible fuel transfer pipework system, engineered for safe, reliable and efficient delivery of diesel, HVO, petrol and aviation fuels in demanding environments.
Designed for backup generator fuel systems, marine refuelling infrastructure, commercial buildings, automotive manufacturing plants and engine test facilities, DoubleTrac® offers fire-rated protection, corrosion resistance and rapid mechanical installation — with no welding required.
System Construction
Flexible Pipework with Robust Metal-to-Metal Fittings
DoubleTrac® is designed as a complete secondary-contained fuel transfer pipework system, combining flexible stainless steel pipework with mechanically assembled fittings. This gives specifiers and installers a practical alternative to fabricated welded steel pipework, especially on complex routes through plant rooms, risers, rooftops, marinas and building services spaces.
Pipe Construction
DoubleTrac® pipework uses a flexible stainless steel primary pipe within a secondary containment system, with a robust outer jacket suitable for demanding fuel transfer applications.
- Stainless steel primary pipe for fuel transfer
- Secondary containment layer to support leak detection
- EFEP barrier for containment performance
- Nylon 12 outer jacket for durability and protection
- Flexible coil format to simplify routing and reduce joints
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Fitting Construction
DoubleTrac® fittings are mechanically assembled using hand tools, removing the need for welding or hot works during installation.
- Stainless steel mechanical fittings
- Metal-to-metal primary liquid seals
- No hot works required for fitting assembly
- End fittings, elbows, tees and straight couplers available
- Interstitial test / monitoring ports to support leak detection
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Supplied & Supported by PFS Fueltec
Stocked for Fast Supply, Cut to Length and Ready for Site
PFS Fueltec stocks DoubleTrac® pipework and fittings for fast supply. We cut our master reels to the required project lengths before shipping, helping installers work with long, continuous pipe runs and significantly reducing the number of joints required on site.
Cut-to-Length Supply
Pipework can be supplied in project-specific coil lengths, helping create continuous, joint-free routes between key connection points.
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Free Installer Training
We offer free training for new DoubleTrac® installation contractors, including training at our premises, at the contractor’s premises, or on-site where suitable.
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Certified Installers
For clients who need a third-party installer, PFS Fueltec can introduce pre-certified DoubleTrac® contractors with experience installing the system.
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2 Hour
Fire-rated performance for demanding applications
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No Hot Works
Mechanical fitting installation using hand tools
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Pipe-in-Pipe
Secondary-contained construction for leak detection
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Cut to Length
Supplied from stock in project-specific coils for continuous, joint-free runs
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Technical Downloads
Product Data, Installation Guides & Case Study Documents
Download the key DoubleTrac® documents for product selection, project planning, specification support and installation reference. For project-specific advice, contact PFS Fueltec and we can help you select the correct pipework, fittings, leak detection and supporting equipment.
DoubleTrac® Product Sheet
A useful first-look product sheet covering the main DoubleTrac® features, applications and product information.
Download Product Sheet
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Technical Guide
Manufacturer technical information for DoubleTrac® pipework, useful for design review, specification checks and project documentation.
Download Technical Guide
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Design & Installation Guide
Design and installation guidance for DoubleTrac® pipework, including practical information for correct system planning and installation.
Download D&I Guide
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Critical Power Case Study
See how DoubleTrac® helped deliver a complex rooftop generator fuel supply project faster than traditional welded steel.
Download Case Study
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Resources for Specifiers
CAD Drawings, BIM Objects & Written Specification Clauses
Need to include DoubleTrac® in a project design package, tender document or M&E specification? Use the links below to access manufacturer-hosted technical resources for drawings, BIM objects and written specification clauses.
CAD Drawings
Access manufacturer CAD drawing resources to support project layouts, pipework details and technical design submissions.
View CAD Drawings
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BIM Objects
Download BIM objects for use in model-based design workflows and coordinated building services project packages.
View BIM Objects
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Spec Clauses
Use written specification clause resources as a starting point for project specifications and tender documentation.
View Spec Clauses
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Please check that any downloaded drawings, BIM objects or specification clauses are appropriate for the specific project, fuel type, installation route, local authority requirements and current manufacturer guidance. PFS Fueltec can assist with product selection and project-specific technical queries.
Why Choose DoubleTrac®?
- Built for Critical Infrastructure: Trusted in data centres, hospitals, industrial facilities, engine test cells and marina fuelling stations where dependable fuel transfer is essential.
- Ideal for Generator Fuel Supply & Return Lines: Suitable for day tanks, belly tanks, sub-base tanks and bulk-to-day tank transfer systems.
- Suitable for Diesel and HVO: Supports the move from conventional diesel to Hydrotreated Vegetable Oil in backup power and fuel transfer applications.
- Fire-Rated to 2 Hours: Designed for high-risk commercial, industrial, marine and in-building environments.
- Weld-Free Installation: Mechanical fittings can reduce project timelines, labour requirements and hot works on site.
- Stocked and Cut to Length by PFS Fueltec: We stock DoubleTrac® pipework and fittings for fast supply, cutting master reels to the required project lengths before shipping to help installers achieve continuous, joint-free pipe runs wherever possible.
- Leak Detection Ready: DoubleTrac® is designed with an interstitial space suitable for monitoring. PFS Fueltec would normally recommend an SGB Class 1 constant monitoring over-pressure or vacuum electronic leak detection system for double-wall fuel pipework where continuous leak monitoring is required.
- Installer Training and Contractor Support: PFS Fueltec offers free training for new DoubleTrac® installation contractors and can introduce pre-certified installation contractors where a third-party installation team is required.
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Flexible routing helps simplify complex fuel transfer installations through plant rooms, risers and service routes.
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Recommended Leak Detection
Class 1 Continuous Electronic Leak Detection for Double-Wall Pipework
For double-wall fuel pipework systems, PFS Fueltec would always recommend leak detection via an SGB Class 1 constant monitoring over-pressure or vacuum electronic leak detection system, selected to suit the application and installation arrangement.
This provides continuous monitoring of the interstitial space and gives a clear alarm if the containment integrity is compromised, helping support environmental protection, compliance and long-term fuel system safety.
View SGB Leak Detection Systems
View DoubleTrac® Downloads
Watch DoubleTrac® in Action
Product Videos, Fitting Guidance & Customer Testimonial
See why DoubleTrac® is becoming a preferred pipework system for specifiers and installers working on generator fuel systems, building services routes, marinas and critical fuel transfer projects.
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DoubleTrac® Overview
A practical overview of the DoubleTrac® system, its construction, main benefits and common fuel transfer applications.
Open on YouTube
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Threaded Fitting Assembly
See how DoubleTrac® fittings are assembled using hand tools — with no welding, no hot works and no specialist fabrication required.
Open on YouTube
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Customer Testimonial
A real-world marina installation showing how DoubleTrac® performs on demanding fuel transfer projects.
Open on YouTube
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Customer Success Story
Fire-rated diesel transfer pipework installed 10 days faster on a complex rooftop genset project
A real-world DoubleTrac® installation from a basement bulk tank to a rooftop day tank on a new-build commercial office project in Dublin.
“Whenever we’re installing diesel transfer pipework systems on gen-set installs, we turn to DoubleTrac® pipework as our go-to solution.
Compared to traditional welded steel, installation was around 10 days faster — supporting programme delivery and saving approximately €9,000.
No other pipework system offers this combination of simplicity, speed, performance, safety, and cost efficiency.”
Jonathan Heasley — Premier Energy Storage
View Full Case Study PDF
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250m
Approximate pipe run
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2 hour
Fire-rated performance
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10 days
Programme saving vs welded steel
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~€9k
Approximate project cost saving
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Primary Applications for DoubleTrac® Pipework
Backup Generator Fuel Systems
Flexible pipe solutions for fuel supply and return lines serving day tanks, sub-base tanks and belly tanks in data centres, hospitals and commercial buildings.
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Marine Refuelling Installations
Fire-rated, corrosion-resistant pipework for diesel and petrol dispensing at marinas and portside fuelling points.
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Automotive & Engine Test Facilities
Proven in automotive production lines and engine test cells requiring clean, durable and fire-safe fuel transfer infrastructure.
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In-Building Fuel Distribution
Designed for complex routes through plant rooms, risers, overhead trays, ducting systems and service spaces.
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Key Features of the DoubleTrac® Fuel Piping System
- 316 Stainless Steel Pipework: Inner and outer pipes constructed from corrosion-resistant stainless steel for compatibility with diesel, HVO, petrol, bio-diesel, aviation fuels, AdBlue / DEF and various industrial chemicals.
- Double-Wall Construction: Inner stainless steel layer with EFEP outer barrier delivers excellent containment performance and long-term durability.
- Fire-Tested to 2 Hours: Suitable for demanding environments including generator enclosures, risers and plant rooms.
- Manual Flexibility: Can be hand-bent to suit on-site routing, reducing the need for elbow fittings and lowering potential leak paths.
- Custom Coiled Lengths: Supplied cut-to-measure in coils to minimise jointing and streamline installation.
- Leak Detection Integration: Built-in interstitial space suitable for connection to an appropriate Class 1 leak detection system.
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Compatible Fuels & Fluids
- Diesel
- HVO
- Petrol / Gasoline E0–E85
- Bio-Diesel
- Jet A / Jet A-1 / Avgas
- AdBlue / DEF
- Various industrial chemicals
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Why Installers Like DoubleTrac®
Traditional welded steel pipework can be slow, labour-intensive and disruptive — especially when routes pass through plant rooms, risers, rooftops and live construction environments. DoubleTrac® helps simplify the job.
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No welding
Reduced hot works and permit requirements.
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Fewer joints
Long continuous pipe runs help reduce potential leak paths.
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Fast fitting system
Mechanical fittings installed with standard hand tools.
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Flexible routing
Useful for complex routes through buildings and service spaces.
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Certifications & Compliance
- UL 1369 Certified: Listed for aboveground fuel piping and pressure tested for commercial and industrial safety compliance.
- UL 971 Certified: Approved for underground fuel transfer applications, including tank farm connections and site-wide distribution.
- Marine & Building Use Ratings: Suitable for fuel transfer through ductwork, sumps and marina fuel systems.
- Temperature Resilience: Suitable for demanding climates and exposed installations, subject to the latest manufacturer guidance and project-specific design review.
- Leak Detection: For monitored double-wall installations, PFS Fueltec recommends SGB Class 1 constant monitoring over-pressure or vacuum electronic leak detection systems.
Warranty & Durability
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15-Year Warranty
For aboveground and marine installations.
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30-Year Warranty
For underground applications in compliance with UL 971.
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Engineered for Professional Installations
Whether you're designing a critical backup generator system, specifying pipework for a marine fuelling project, or integrating fuel infrastructure in an automotive production or test facility, DoubleTrac® offers long-term performance, strong safety credentials and rapid deployment — all backed by certified compliance and expert technical support from PFS Fueltec.
PFS Fueltec can also help with the associated system package, including suitable SGB Class 1 leak detection, installation guidance, pipework sizing, fittings, project quotes and fast delivery.
Product Specifications
Common DoubleTrac® pipework sizes and operating parameters are shown below. Please contact PFS Fueltec for project-specific sizing, compatibility checks, fitting selection, leak detection selection and technical support.
| Part # |
Pipe Size |
Internal Diameter |
Jacket Outer Diameter |
Minimum Bend Radius |
Weight |
Max Horizontal Support Distance |
Max Vertical Support Distance |
| UGF-FSP-16 |
1” (DN25) |
27mm |
39mm |
305mm |
1.16 kg/m |
1.8m |
4.5m |
| UGF-FSP-24 |
1.5” (DN40) |
39mm |
58mm |
610mm |
2.23 kg/m |
2.4m |
4.5m |
| UGF-FSP-32 |
2” (DN50) |
52mm |
74mm |
813mm |
2.97 kg/m |
3.0m |
4.5m |
Primary Pipe Operating Parameters
| Pipe Size |
Primary Max Operating Pressure |
Primary Max Test Pressure |
Bend Radius |
Max Vacuum Rating |
| 1” (DN25) |
425 psi / 29.30 bar |
622.5 psi / 42.92 bar |
12 inch / 304.8mm |
29 Hg / 98.2 kPa |
| 1.5” (DN40) |
330 psi / 22.75 bar |
495 psi / 34.13 bar |
24 inch / 609.6mm |
29 Hg / 98.2 kPa |
| 2” (DN50) |
250 psi / 17.24 bar |
375 psi / 25.86 bar |
32 inch / 812.8mm |
29 Hg / 98.2 kPa |
Secondary Containment Operating Parameters
| Pipe Size |
Secondary Max Operating Pressure |
Secondary Max Test Pressure |
Weight |
| 1” (DN25) |
50 psi / 3.4 bar |
75 psi / 5.17 bar |
0.75 lbs/ft / 1.16 kg/m |
| 1.5” (DN40) |
50 psi / 3.4 bar |
75 psi / 5.17 bar |
1.5 lbs/ft / 2.23 kg/m |
| 2” (DN50) |
50 psi / 3.4 bar |
75 psi / 5.17 bar |
2.0 lbs/ft / 2.97 kg/m |
Please verify dimensions, pressure ratings, test pressures and support requirements against the latest DoubleTrac® technical documentation before final specification or installation.
Need to Add DoubleTrac® to a Specification or Design Package?
Specifiers can access manufacturer-hosted CAD drawings, BIM objects and written specification clauses for OmegaFlex / DoubleTrac® via ARCAT. These resources are useful when preparing drawings, BIM models, tender packages and project specifications.
CAD Drawings
BIM Objects
Written Spec Clauses