Development and production of helical extrusion technology for large-volume plastic pipes from DN/ID 300 to 5000 mm
Krah GmbH
Schutzbach (Westerwald) · GermanyNew on Amplifa
About Krah
Krah GmbH is a family-owned company based in Schutzbach in the Westerwald region, which has been developing and producing the Krah helical extrusion technology for the manufacture of large-volume plastic pipes since 1968. With a single Krah machine, pipes from DN/ID 300 to DN/ID 5000 mm can be produced: profile pipes for gravity applications, solid-wall pressure pipes, low-pressure pipes as well as fittings, manholes, tanks and special applications made of polyethylene (HDPE), including PE 100 with structured wall according to DIN 16961. The seamless, smooth and inspection-friendly inner surface features an integrated socket for electrofusion pipe joints. In addition to machine manufacturing, including in-house produced auxiliary machines for complete pipe production halls, Krah offers engineering services such as technical calculations, feasibility studies and custom pipe systems, as well as comprehensive turn-key support from financing assistance through training to know-how transfer. Projects have been realized, among others, in Peru (deep-water discharge of the Taboada wastewater treatment plant, DN/ID 3000) and Argentina (drinking water supply Buenos Aires, PE 100 DN/ID 3600 mm).
- Site
- Schutzbach
- Processes
- Helical extrusion (spiral wound pipe production, Krah technology), Manufacture of profile pipes for gravity applications (gravity pipes), Manufacture of solid-wall pressure pipes (pressure pipes), Manufacture of fittings, manholes and accessories, Manufacture of tanks and special applications, Electro Fusion Jointing (electrofusion pipe jointing), Patented electrofusion welding process for wound pipes and fittings, Engineering services: technical calculations, feasibility studies, customized
- Materials
- HDPE / Polyethylene (High Density), PE 100, Structured polyethylene according to DIN 16961, Polyethylene (High Density), Helical Extrusion (winding extrusion), Electro Fusion Jointing
- Founded
- 1968
- Industries
- Pipeline construction, Water supply, Wastewater disposal, Treatment technology, Civil engineering
- 01
Engineering: technical calculations and feasibility studies
- 02
Design and construction of machines and tools
- 03
In-house manufacturing of the Krah pipe winding machines and auxiliary machines
- 04
Helical extrusion (wound pipe production DN/ID 300–5000 mm)
- 05
Patented electrofusion welding of pipes and fittings
- 06
Turn-key project support, training and know-how transfer
Materials and Processes
Polyethylene (High Density)
Base material for wound profile pipes, pressure pipes, fittings, manholes and tanks.
PE 100
Material for the world-record pipe DN/ID 3600 mm, SDR 17, in the Buenos Aires waterworks project.
Structured polyethylene according to DIN 16961
Structured wall with properties comparable to or better than solid-wall pipes, without frozen-in stresses.
Helical Extrusion (winding extrusion)
Spirally wound process for cost-efficient, application-tailored pipe wall design.
Electro Fusion Jointing
Electrofusion pipe joints via integrated socket, patented for wound pipes and fittings.
Locations
Schutzbach
DEHeadquarters: mechanical engineering, manufacturing and administration
- Materials
- Polyethylene (HDPE), PE 100
- Krah pipe winding machine (helical extrusion) for DN/ID 300–5000 mm
- Extrusion systems for pipe production
- In-house manufactured auxiliary machines for complete equipping of pipe production halls
Components and Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Helical extrusion (spiral wound pipe production, Krah technology)Plastics | – | – | – | – | Polyethylene (HDPE), PE 100 |
| Manufacture of profile pipes for gravity applications (gravity pipes)Plastics | – | – | – | – | Polyethylene (HDPE) |
| Manufacture of solid-wall pressure pipes (pressure pipes)Plastics | – | – | – | – | Polyethylene (HDPE), PE 100 |
| Manufacture of fittings, manholes and accessoriesPlastics | – | – | – | – | Polyethylene (HDPE) |
| Manufacture of tanks and special applicationsPlastics | – | – | – | – | Polyethylene (HDPE) |
| Electro Fusion Jointing (electrofusion pipe jointing)Joining | – | – | – | – | Polyethylene (HDPE) |
| Patented electrofusion welding process for wound pipes and fittingsJoining | – | – | – | – | Polyethylene (structured wall according to DIN 16961) |
| Engineering services: technical calculations, feasibility studies, customizedEngineering | – | – | – | – | – |
| Design and construction of machines and tools (mechanical/plant engineering)Engineering | – | – | – | – | – |
| Assembly/installation of deepwater intake and outfall pipes (sinking strings, integrated sockets)Assembly | – | – | – | – | Polyethylene (HDPE) |
3 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Krah pipe winding machine (helical extrusion pipe production machine) | Krah GmbH | – | Pipe diameter DN/ID 300 mm to DN/ID 5000 mm | – | Schutzbach / Westerwald, Germany |
| Extrusion system for pipe production | Krah GmbH | – | – | – | Schutzbach, Germany |
| Auxiliary machines for complete equipping of a pipe production hall (in-house manufactured) | Krah GmbH | – | – | – | Schutzbach, Germany |
Additional services
Reference customers
History
- 1968
Founded as a small engineering office for the design of small machines and tools by Karl-Heinz Krah; since then development and production of the Krah helical extrusion technology in the Westerwald.
- 2013
Delivery of PE pipes DN/ID 3000 for the deep-water discharge of the Taboada wastewater treatment plant in Lima, Peru (manufactured by PPA & Krah, Spain).
- 2014
World record: PE 100 pipe DN/ID 3600 mm, SDR 17, for the waterworks project Planta Potabilizadora Juan Manuel de Rosas in Buenos Aires, Argentina.