When it comes to modern gas installations, the demand for safer, faster, and regulation-compliant solutions has never been higher. Whether you're working on a new build or a complex retrofit, certain gas installation environments require extra considerations. That's where Flexigas DS shines, offering a truly complete solution for gas pipe in pipe installation projects, designed to simplify and future-proof your installs.
In this blog, we’ll break down exactly how Flexigas DS supports a wide range of gas installation scenarios and why it should be your go-to flexible gas pipe system for pipe-in-pipe compliance.
What Is Flexigas DS?
Flexigas DS is a double-layered CSST (Corrugated Stainless Steel Tubing) system, designed to meet UK installation standards for gas pipe in pipe installation. It features:
* An inner CSST layer for safe, durable gas transport.
* A slidable outer sleeve made from corrugated fire-retardant PVC and polyethylene.
* A compact annulus between layers to maintain flexibility while meeting the regulatory definition of a pipe sleeve.
This outer layer is key, it allows the tubing to comply with British Standards such as BS 6891 and IGEM/UP/2, 3 & 7, which require gas pipes to be sleeved when routed through certain environments.
One of the standout features of Flexigas DS is its versatility across a wide range of installation scenarios. If you're looking for a single gas pipe in pipe installation system that can handle just about everything, this is it.
Here are all the environments where Flexigas DS can be safely and compliantly installed:
Solid Walls and Structural Elements
Passing pipework through brick or concrete? No problem. The integrated sleeve makes Flexigas DS fully compliant for these installations without needing to add sleeving on-site.
Solid Floors
Flexigas DS meets all the criteria for burying under solid floors, with its dual-layer system providing both mechanical protection and fire resistance.
Earth or Ground/Soil
While single-sleeved Flexigas can be used for direct burial in soil, Flexigas DS offers the added benefit of allowing the inner pipe to be replaced in future, making it the ideal choice for installers looking to future-proof their system.
Screed
Single-sleeved Flexigas is fully suitable for screed installations, and many installers prefer it as it doesn’t require wrapping like copper does. However, Flexigas DS can also be used in these environments for added protection and peace of mind.
Unventilated Voids
The double-sleeve construction and small annulus between layers ensure compliance in unventilated areas, where typical CSST or copper pipe may require additional sleeving or modification.
Unventilated Risers
Thanks to its tight annular space and solid structure, Flexigas DS is ideal for vertical risers in high-rise buildings or plant rooms where airflow is restricted.
These capabilities mean installers no longer need to carry extra sleeves, perform on-site modifications, or worry about non-compliance. With Flexigas DS, your gas pipe in pipe installation is good to go, straight out of the box.
Conventional methods using copper or single-layer flexible gas pipe often require additional work and materials to meet UK regulations. In contrast, Flexigas DS delivers:
* Factory-fitted sleeve
* Reduced risk of damage during installation
* Compliance with EN15266 and BSI Kitemark Certification
* Fire-tested and UV-resistant construction
* Sizes from DN15 to DN50 with full fitting compatibility
Built with Installers in Mind
Flexigas DS is available in 25m, 50m, 75m and 100m coil lengths, making it ideal for continuous runs with fewer fittings. The system is designed to reduce leak points, installation time, and labour costs, all while meeting the criteria for gas pipe in pipe installation in the UK.
The outer sleeve is also marked to indicate the gas-carrying CSST core, with clip-on supports available for quick and secure mounting. For safety, every installation can be electrically bonded using FG Bond, Flexigas’ patented integrated earthing terminal.
Flexigas DS Makes Gas Pipe in Pipe Installation Effortless
Whether you’re working on a residential build, commercial site, or retrofit in a tight space, Flexigas DS is the ultimate system for gas pipe in pipe installation. With full compliance, a flexible profile, and zero need for extra sleeving, it streamlines every part of the process.
Ready to future-proof your next gas installation? Contact us and make the switch to Flexigas DS. The smarter, safer, and faster flexible gas pipe system that keeps you compliant in every scenario.