Flexalen 600

Flexible double and single pipe solutions

The Flexalen 600 flexible pre-insulated pipe range is specifically designed to beat today’s most pressing network lifecycle performance and installation challenges. Its unique design and material properties make it a highly versatile network solution for reliable heating, cooling, and potable water supply.

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Flexalen 600 pre-insulated pipes – first-rate material quality

The Flexalen 600 pre-insulated pipe system consists of a polybutene (PB-1) medium pipe: a flexible polyolefin material that assures quick and reliable assembly, over 50 year lifetime, while being the best in class for pressure and temperature rating, and energy efficiency.

Enclosing the pipe is a polyolefin-based polyethylene insulation that, thanks to its hydrophobic and closed cell structure, minimizes the risk of water absorption. This ensures the insulation properties of Flexalen 600 are safeguarded over its entire product lifecycle.

The protective HDPE outer casing with UV stabilizers ensures optimal protection against any risk of damage throughout the networks’ entire lifetime, while ensuring flexibility.

Proven sustainability

Flexalen 600, now the world’s only Cradle to Cradle Certified™ Silver pre-insulated pipe, was developed with the aim of offering an ideal district heating and cooling solution for both engineers, installers and end-users looking for a durable, maintenance-free and quick to install system. The first Flexalen 600 pre-insulated pipe system was already installed in 1983 in Heiligenkreuz (Austria), and has been running smoothly ever since with zero leaks or maintenance issues.

Check out this recent project in Roosendaal, the Netherlands (English subtitles available)

Assortment

Flexalen 600 is available as a single pipe system (OD25 to 225mm) or a double pipe system (OD25 to 63mm). The polybutene pipe is also available with an oxygen barrier. Flexalen pre-insulated pipes are delivered in coil up to 300m (depending on diameter). Lengths can be customized upon request.

We also offer services to optimize network design and dimensioning, calculation, training, and technical assistance on site.

Get in touch

Thermaflex Asia
Thailand
+66-038 249000-2

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Sustainability

Cradle 2 Cradle certified – for a circular economy
Download the certificate in the knowledge center!
Health

Produced without (H)CFC
Complies to REACH
Complies to VOC (Volatile organic components)
Specificities

High flexibility
Usable for both heating and cooling applications
Safe and secure operation
Long lifetime expectancy
Installation

Easy quick and safe to weld
Service temperature

Wide temperature range

Minimum -15°C

Maximum 95°C
Availabilities

Available in long lengths
Full range of accessories
Available with oxygen barrier
Available in twin or single carrier pipes
Several insulation thicknesses available for diverse applications

Polybutene-1, ideal for district heating, cooling and potable water networks

Flexalen 600 pre-insulated pipes consist of a flexible polybutene (PB-1) medium pipe, ensuring durable performance in large-scale district heating and cooling networks as well as domestic applications:

High flexibility
Minimal creep
High tensile strength
Minimal heat loss
Minimal expansion forces
Long lifetime (up to 100 years depending on use)
Size range from 20 to 125mm in SDR class 11
Available with oxygen barrier
Smooth internal walls (7 x 10^-6 m over lifetime)
Less pressure loss, no biofilm or incrustation
Allows electrofusion, poly-fusion and butt-fusion welding
Cradle to Cradle Certified™ Silver
100% recyclable

Thermaflex insulation foam – high and durable energy performance

Direct extruded polyethylene insulation encloses the pipe, keeping the water absorption coefficient to a minimum thanks to its integrated water vapor barrier and closed cell structure. It is available in 3 thicknesses: compact, standard and large-scale DHC.

HDPE jacket for superior protection

A protective corrugated HDPE outer casing with UV stabilizers ensures high mechanical strength and flexibility throughout the networks’ entire lifetime.

Complex networks mastered by design

Thanks to the unique features of the Flexalen 600 pre-insulated pipe system, many aspects of the network can be optimized to reduce the initial investment and operating costs:

Easy welding allows narrow trenches
Flexibility eliminates the need for work-arounds, reducing quantity of materials and fittings
Low pressure drop allows smaller pipe diameters, faster flow with less pump capacity
No network segmentation needed, limiting the number of on-site connections

Our team of network engineers is at your disposal for any technical questions or assistance in dimensioning or route optimization.

Find all the technical details in our product guide in the download section.

Flexalen 600 – Optimal installation efficiency

The flexibility, weldability and low weight of Flexalen 600 pre-insulated pipes greatly simplifies and accelerates installation. Electrofusion, poly-fusion and butt-fusion welding techniques ensure durable and record-breaking system welding in respect to ease and speed of installation.

Prefabrication smooths the way

For even faster installation, Thermaflex can deliver fully prefabricated and factory-tested connections. This reduces the amount of on-site welded connections to just 30% of traditional designs. This comes with multiple benefits.

Minimize installation risk
Reduce handling and trench time
Stay on planning and budget
Control installation and overhead costs

Comprehensive installation support

Installation training
Pre-check of design and parts during order
On-site installation support
Welding training for complex projects
Installation manuals

Find all the technical details in the Flexalen product guide in the download section.

Westin Playa Bonita Driving smart, green development in Panamas' hotel industry Panamá, Panama

The Oberoi Rajvilas India Flexalen in one of the best hotels in the world Jaipur, India

Park Hyatt in Goa A comfortable fit Goa, India

Purmerend's network resurrection District Heating 2.0 Purmerend, Netherlands

Environmental Certifications

Cradle to Cradle - Carbon offsetting 2015-2019

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Thermaflex Isolatie B.V. has offset 290 tonnes of CO2 tooffset 50% of the emissions caused by the production of C2C products (Flexalen 600).

Thermaflex directly invests in emission reduction projects which combine energy, environment and developmental solutions into sustainable business opportunities in developing countries, with the help of the Climate Neutral Group.

Certificates

WRAS Approval - Polybutene pipes	PDF	823 KB	Preview	Download	Mail
Approval contact with wholesome water for domestic purposes having met the requirements of BS 6920-1:2000 'suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of water'.
Lambda test certificate according to EN 15632-1 - Flexalen 600, 0.037	PDF	1229 KB	Preview	Download	Mail
Lambda test certificate according to EN 15632-1 - Flexalen 600
Determination of the resistance to internal pressure at a constant temperature - PB pipes	PDF	106 KB	Preview	Download	Mail
Determination of the resistance to internal pressure at a constant temperature according to ISO 1167- PB pipes
DIN 4102 B2 Certificate Flexalen 600	PDF	1008 KB	Preview	Download	Mail
"Kleinbrenner"-test (Buyilding material Class B2) according to DIN 4102 B2 for Flexalen 600
Lambda test certificate according to EN 15632-1 - Flexalen 600, 0.036	PDF	1304 KB	Preview	Download	Mail
Lambda test certificate according to EN 15632-1 - Flexalen 600, 0.036
Determination of the resistance to internal pressure at a constant temperature - PB pipes grey	PDF	112 KB	Preview	Download	Mail
Determination of the resistance to internal pressure at a constant temperature according to BRL K17401 - PB pipes grey
Public health certificate - Polybutene pipes	PDF	191 KB	Preview	Download	Mail
Public health certificate for polybutene pipes (IT)
Determination of influence of heating at 110 degrees - PB pipes grey	PDF	104 KB	Preview	Download	Mail
Determination of influence of heating at 110 degrees according to DVGW W544 - PB pipes
VOC Microchamber test certificate - Flexalen 600, ThermaSmart PRO	PDF	151 KB	Preview	Download	Mail
VOC Microchamber test certificate - Flexalen 600, ThermaSmart PRO. According to ISO 16000.
Earth Quake resistance certificate	PDF	735 KB	Preview	Download	Mail
Technical report of dynamic tests performed on Flexalen pre-insulated pipe systems, simulating seismic with 7-9 intensity on the MSK-64 scale. Flexalen is recommended for applications in the regions with seismic activity of 7-9 magnitude.
Drinking water Health Certificate - Flexalen, PB pipes	PDF	225 KB	Preview	Download	Mail
Drinking water Health Certificate for Flexalen and PB pipes (RO)
KTW organoleptic test certificate - Flexalen, PB pipes - Size group 1	PDF	221 KB	Preview	Download	Mail
KTW organoleptic test certificate for drinking water purposes - Flexalen, PB pipes - Size group 1
DVGW W544 approval Flexalen PB (Group 1)	PDF	6752 KB	Preview	Download	Mail
DVGW type examination certificate. Product Category: Plastic pipes for drinking water installations. Registration number DW-8321CM0089 (April 2011).
CE Declaration of Conformity - ThermaSmart PRO, Flexalen 600	PDF	524 KB	Preview	Download	Mail
CE Declaration of Conformity - ThermaSmart PRO, Flexalen 600
Temperature cycling test certificate - Flexalen	PDF	1536 KB	Preview	Download	Mail
Temperature cycling test certificate according to EN 12293 - Flexalen
Determination of influence of heating at 110 degrees - PB pipes	PDF	103 KB	Preview	Download	Mail
Determination of influence of heating at 110 degrees according to DVGW W544
DVGW W544 approval Flexalen PB (Group 2)	PDF	434 KB	Preview	Download	Mail
DVGW type examination certificate. Product Category: plastic pipes for drinking water installations (group 2). Registration number: DW-8326CP0310 (September 2014).

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