The FlexiGas 50mm Double Sleeved Flexible Gas Pipe (DS-50) – 100m Spool is a pre-sleeved, twin-layer CSST gas pipe designed for large-scale gas installation projects. Its patent-pending pipe-in-pipe construction combines a corrugated stainless steel gas pipe with a yellow PE cover inside a V0 fire-rated corrugated sleeve, providing a ready-to-install solution for solid walls, solid floors, screed, soil and unventilated voids without requiring additional sleeving on site.
Manufactured to BS/EN 15266 and certified under the BSI Kitemark scheme (KM 598726), the DS-50 bends easily by hand to create long continuous runs with fewer joints and potential leak points. The 100 metre spool format is particularly suited to major commercial and industrial projects requiring 50mm gas mains at volume.
Key Features
Patent-Pending Pipe-in-Pipe Design
The DS-50 combines an inner corrugated stainless steel gas pipe with a yellow PE cover, positioned inside a V0 fire-rated corrugated sleeve in a slidable configuration. This allows the CSST to be inserted and withdrawn when required.
Built-In Sleeving for Multiple Installation Scenarios
The pre-sleeved construction meets the supplied BS 6891 and IGEM/UP/2, 3 & 7 sleeve requirements for installation through solid floors, solid walls, structural elements, earth or soil, screed, unventilated voids and unventilated risers.
Fast, Flame-Free Installation
The flexible CSST bends by hand to create continuous runs with far fewer joints and potential leak points. According to the supplied product information, installation requires no soldering, sealants or specialist tools.
Secure Metal-to-Metal Connection
The DS-50 pairs with FlexiGas™ DN50 male BSP adaptors and straight unions manufactured in dezincification-resistant brass for a secure metal-to-metal connection.
FG Bond™ Ready
The DS-50 can be paired with the integrated earthing terminal certified to BS 951:2009 for quick and tidy electrical bonding.
Easy On-Site Handling
Metre-marked tubing, a high-visibility yellow jacket and one free roll of silicone tape supplied with every spool provide practical features for installers working on larger gas pipework projects.
Designed for Flexible 50mm Gas Pipe Installation
The FlexiGas DS-50 is designed for installations where 50mm flexible gas pipework is required across a variety of building and installation environments. Its pre-sleeved pipe-in-pipe construction provides the built-in sleeve specified for the installation scenarios supplied with the product.
Solid Walls & Floors
Suitable for the specified installation scenarios through solid walls, solid floors and structural elements.
Screed & Soil
The pre-sleeved construction is designed for the supplied installation scenarios including screed and earth or soil.
Unventilated Voids
Built-in sleeving supports the specified use through unventilated voids and unventilated risers.
Long Continuous Runs
Flexible tubing bends by hand to help create long continuous runs with fewer joints.
Certification & Compliance
The DS-50 is manufactured to BS/EN 15266 and certified under the BSI Kitemark scheme (KM 598726). The supplied product information also states that the pipe has passed EN 1775 Annex A & B fire testing, with a jacket classification of B-s1 d0.
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BSI Kitemark: KM 598726
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Manufacturing standard: BS/EN 15266
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Fire testing: EN 1775 Annex A & B passed
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Jacket classification: B-s1 d0
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Electrical bonding: FG Bond™ ready with terminal certified to BS 951:2009
Technical Specifications
| Manufacturer / MPN |
FlexiGas™ / DS-50-100 |
| Size |
DN50 (50mm) |
| Length |
100 metres — spool |
| CSST Outer / Internal Diameter |
60mm / 50mm |
| Total Maximum Diameter Including Sleeve |
73mm |
| Maximum Operating Pressure |
0.5 bar (BS/EN 15266) |
| Tubing Material |
1.4404 / 1.4541 stainless steel (BS/EN 10088) |
| Fire Performance |
EN 1775 Annex A & B passed; jacket B-s1 d0; UV resistant |
| Certification |
BSI Kitemark KM 598726, EN 15266 |
| Colour |
Yellow |
| Warranty |
1 year (subject to manufacturer's T&Cs) |
Installation Benefits
Flexible by hand: The corrugated stainless steel pipe can be bent by hand, helping installers create long continuous routes.
Fewer joints: Continuous runs can reduce the number of connections and potential leak points compared with installations requiring numerous rigid sections.
No additional sleeving: The pipe-in-pipe construction provides the built-in sleeve for the specified installation scenarios.
100m spool format: The large spool allows installers to make exact cuts for major projects while helping minimise material wastage.
Ideal For
The FlexiGas DS-50 100m spool is particularly suited to major commercial and industrial projects requiring 50mm gas mains at volume. Its large spool format supports exact cuts and helps minimise material wastage across larger installations.
- Major commercial gas installation projects
- Industrial gas pipework installations
- Large-scale 50mm gas main installations
- Projects requiring long continuous flexible gas pipe runs
- Installations through solid walls, floors, screed and soil
- High-volume projects where a 100m spool is practical
Compatible & Complementary Products
The DS-50 can be paired with FlexiGas installation accessories and connection components, including:
DN50 Male BSP Adaptors
FlexiGas connection components
DN50 Straight Unions
For compatible pipe connections
FlexiGas Spool Roller
Designed for spool handling
Frequently Asked Questions
What is the FlexiGas DS-50?
The FlexiGas DS-50 is a 50mm DN50 double-sleeved flexible gas pipe supplied on a 100 metre spool. It uses a pipe-in-pipe CSST design with a built-in sleeve.
Does the DS-50 require additional sleeving?
The supplied product information states that the pre-sleeved DS-50 is designed to pass through the specified installation scenarios without additional sleeving on site.
What length is the FlexiGas DS-50 supplied in?
The DS-50 is supplied as a 100 metre spool, making it suitable for major commercial and industrial gas pipework projects.
What is the maximum operating pressure?
The specified maximum operating pressure is 0.5 bar in accordance with BS/EN 15266.
What fittings are compatible with the DS-50?
The supplied product information states that the DS-50 pairs with FlexiGas DN50 male BSP adaptors and straight unions in dezincification-resistant brass.
What is included with the spool?
Each 100 metre spool includes one free roll of silicone tape. The tubing is also metre-marked and supplied with a high-visibility yellow jacket.
FlexiGas DS-50 100m Spool
A pre-sleeved DN50 flexible gas pipe solution for major commercial and industrial installations, combining flexible CSST construction, built-in sleeving, BSI Kitemark certification and a practical 100 metre spool format for high-volume gas pipework projects.
