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Pre-insulated Pipes

Smart networks for decades of service

For decades, we’ve worked closely together with engineers, municipalities, contractors, and installers to drive continuous innovation in the development of our district heating and cooling systems. Today, our pre-insulated pipe systems go above and beyond industry standards in ensuring reliability, durable performance, simplicity, and speed of installation.

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Network solutions for any challenge

We offer a complete range of flexible pre-insulated pipes ideal for district heating, cooling, and potable water applications in renovation, newbuild or retrofit projects. All our network solutions are fully adaptable to local circumstances and future needs. From single take-away box solutions for A to B connections to complete prefabricated district heating and cooling networks on coil.

Discover our range of pre-insulated pipe systems:

  • Flexalen 600: Cradle to Cradle Certified™ Silver, and the most popular choice
  • Flexalen SL semi-rigid pipes for high volume networks
  • Flexalen 1000+ multi-pipe system for absolute freedom in network design
  • Tailor-made prefabrications combining optimal reliability and installation speed
  • Complete range of tools and accessories to facilitate system installation

Why choose Thermaflex pre-insulated pipes?

  • Quick and easy installation
  • High energy efficiency
  • Consistent performance over time
  • Extended lifetime
  • Fully and homogeneously weldable for increased reliability
  • Non-corrodible
  • Modern high-end materials
  • Technical benefits of Polybutene (PB-1)
  • High ecological value
  • Extensive installation support: integrated network design, calculation tools, training and on-site support

Downloads

Reports

  Pressure drop PB-pipes PDF 44 KB Preview Download Mail

Pressure drop PB-pipes

Articles

  EuroHeat&Power: Optimized heating and cooling systems PDF 270 KB Preview Download Mail

New economic connection solution for flexible piping: optimized heating and cooling systems for low energy housing developments. 

(EuroHeat&Power Magazine, English Edition, Feb. 2013)

  EuroHeat&Power: Innovative concept with flexible pipes PDF 435 KB Preview Download Mail

Innovative Concept with flexible pipes: 

New Record: 1,5 hours for ten house connections.

(EuroHeat&Power Magazine, English Edition, Nov. 2014)

Brochures Catalogues

  Flexalen Product Guide PDF 4736 KB Preview Download Mail

The Flexalen Product Guide offers all system, application & technical specifications for all Flexalen product ranges.

  Successful in the past - prepared for the future (PBPSA) PDF 1619 KB Preview Download Mail

This brochure is giving an introduction to Polybutene including a review of the performance of Polybutene pressure piping systems in meeting the needs of sustainable building regulations.

  Flexalen - No1 choice for specifiers around the world PDF 438 KB Preview Download Mail

Why is Flexalen the No1 choice for specifiers around the world?

Installation Manuals

  Flexalen instruction: Laying instruction PDF 1936 KB Preview Download Mail

Laying instruction for Flexalen 600, Flexalen 1000+, Straight lenghts and Flexalen Solar.

  Flexalen instruction: Pressure testing PDF 1599 KB Preview Download Mail

Pressure testing and pressure test protocol.

Technical Datasheets

  Drukverliezen PB-leidingen PDF 44 KB Preview Download Mail

Drukverliezen PB-leidingen

Safety Data Sheets

  Flexalen: Corrugated tubes PDF 133 KB Preview Download Mail

Safety data sheet: Flexalen corrugated tubes (outer casing).

  Flexalen: Foam PDF 136 KB Preview Download Mail

Material safety data sheet: Flexalen foam

  Flexalen: Polybutene PDF 45 KB Preview Download Mail

Material safety data sheet: Polybutene-1 (PB grey)

Whitepapers

  Flexalen: Acoustic properties PDF 29 KB Preview Download Mail

Acoustic properties Polybutene.

  Flexalen: Creep resistance PDF 23 KB Preview Download Mail

Creep resistance Polybutene.

  Flexalen: Dimensions Plumbing Pipes PDF 25 KB Preview Download Mail

Dimensions plumbing pipes

  Flexalen: Expansion compensation PDF 420 KB Preview Download Mail

Expansion compensation.

  Flexalen: Fire behaviour PDF 18 KB Preview Download Mail

Fire behaviour of Polybutene.

  Flexalen: Flexural Elastic Modulus PDF 28 KB Preview Download Mail

Flexural Elastic Modulus of Polybutene.

  Flexalen: Heat conductivity PDF 40 KB Preview Download Mail

Insulation value - heat conductivity of Polybutene.

  Flexalen: Heat conductivity plastics PDF 28 KB Preview Download Mail

Heat conductivity comparision Polybutene to other plastics.

  Flexalen: Oxygen permeation resistance PDF 32 KB Preview Download Mail

Oxygen permeation resistance

  Flexalen: Temperature pressure PDF 48 KB Preview Download Mail

Temperature - pressure - resistance of Polybutene.

  Flexalen: Thermal expansion PDF 29 KB Preview Download Mail

Thermal expansion.

  Flexalen: Water hammer resistance PDF 65 KB Preview Download Mail

Water hammer resistance.

  Flexalen: Wet abrasion resistance PDF 80 KB Preview Download Mail

Wet abrasion resistance.

Certificates

  REACH Declaration PDF 348 KB Preview Download Mail

We fully commit ourselves to the protection of human health and environment. We take that responsibility seriously, so that also goes for the materials that we use in our production. All Thermaflex components are REACH compliant: risk-free and safe to use under any conditions in conformity with the Registration, Evaluation, Authorisation and Restriction of Chemicals by EU regulation.

  KIWA International Conformity EN15632 Flexalen 600 PDF 524 KB Preview Download Mail

KIWA International Conformity EN15632 part1 and 3 - Flexalen 600.

(May 2011).

  KIWA - KOMO Certificate BRL 5609 - Flexalen 600 PDF 1179 KB Preview Download Mail

KIWA - KOMO technical approval-with-product certificate for Flexalen 600. 

(January 2007).

  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

  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

  KIWA certificate K8492801 welding process for plastic piping systems Flexalen 600 PDF 371 KB Preview Download Mail

This process certificate is issued by KIWA on the basis of BRL 5609 'pre-insulated flexible plastics piping systems for warm water distribution outside buildings'

Together with KIWA the welding process of electrofusion, polyfusion and butt welding is technical approved with product certificate stated requirements.

  KTW organoleptic test certificate - Flexalen, PB pipes - Size group 1and 2 PDF 221 KB Preview Download Mail

KTW organoleptic test certificate for drinking water purposes - Flexalen, PB pipes - Size group 1 and 2

Certification nr. DW-8326CP0310 75 - 160mm

Certification nr. DW-8321CM0089 10 - 63mm

  KIWA Certificate BRL K536C - PB pipes PDF 543 KB Preview Download Mail

Product certificate for PB pipes.

(August 2005).

  KWR Biofilm cultivation test certificate - PB pipes PDF 577 KB Preview Download Mail

KWR Biofilm cultivation test certificate - PB pipes

  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

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