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KRAH Profile tubes

Haplast is the only manufacturer of KRAH profile pipes in Norway.

We use KRAH technology which makes it possible to produce PE profile pipes up to 3 meters in diameter. The pipes can be produced in several ring stiffness classes – including SN-8.

Products

Profile types for KRAH- pipe

Haplast produces KRAH™ profile pipes in several profile types. This allows us to adapt the pipe wall to the application, dimension, load and desired ring stiffness, including SN8.

The difference between the profile types lies in how the pipe wall is built up. Some profiles are open and light, while others are closed and extra robust. The correct profile type is selected based on what the pipe or product will be used for, and what requirements the project has for strength, ring stiffness, weight, density and further processing. All profile types can be produced with internal dimensions from Ø600mm to Ø3000 mm.

We help you choose the right profile type that meets your project's needs.

How to choose the right profile and ring stiffness

VW profile/Flatband

Flatband is a solid, smooth-walled profile type with a homogeneous pipe wall. It is very suitable where a smooth surface and a robust construction are desired. The solid profile ensures 100% tight penetrations and allows

Typical applications:

  • Water basins
  • Drainage sumps
  • Special products

When do we choose VW?

VW is a good choice when the product is to be further processed, welded or rebuilt. We use solid VW profiles in our water and sewage sumps.

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PR profile has a smooth inside and a profiled outside. The smooth inside provides good hydraulic properties, while the profiled outside contributes to lower weight and high ring stiffness. PR profile can be laid in several layers.

Typical applications:

  • Road pipe
  • Culvert
  • Overhead water pipe

When do we choose PR?

PR is a good choice for pipelines where low weight, high ring stiffness and efficient water flow are important. PR is most often chosen for road pipes and culverts in road projects.

CPR

CPR is a closed profile type with a solid, smooth inner layer, a layer with a profile and a solid outer layer. The structure provides a robust pipe wall with high strength, low weight and tight pipe penetrations. CRP can be combined with PR.

Typical applications:

  • Water and fire water tanks
  • Sedimentation tanks
  • Sludge separators and storage tanks

When do we choose CPR?

CPR is well suited for products that need to be strong, stable and tight, and which may also require further processing or welding. The profile type is used when a closed and robust pipe wall is an advantage.

OP

Omega profile (OP) is a stronger variant of PR. The profile type has a smooth inside and a stronger profiled outside, and is used where there is a need for higher strength and ring stiffness than a simpler profile structure provides.

Typical applications:

  • Road pipe
  • Culvert
  • Stormwater pipes
  • pipe in large dimensions
  • Projects with extra high requirements for strength and ring stiffness

When do we choose OP?

OP is chosen when we want the benefits of a profiled pipe , but with increased strength and higher ring stiffness. The profile type is well suited for pipe which must withstand external loads from the ground, roof covering or high traffic loads.

SOP

SOP is a closed, Omega profile that provides very favorable stiffness-to-weight for high loads, high coverage or large diameters.




Typical applications:

  • Mind
  • Large PE structures
  • Special products
  • Projects with extra high requirements for strength and ring stiffness

When do we choose SOP?

SOP has the same main application as CPR, but has extra profile layers that provide increased strength and ring stiffness. This makes the profile type well suited for projects with higher demands on load, dimensional stability and structural strength.

11K

11K is a heavy-duty profile type used where high demands are placed on strength and ring stiffness. The profile structure provides a robust pipe wall that is well suited for larger dimensions and more demanding projects. 11K can be laid in multiple layers.

Typical applications:

  • Special products
  • Very high basins
  • Pumping stations



When do we choose K11?

11K is chosen when the project requires a strong profiled pipe wall with high load-bearing capacity combined with density. The profile type is relevant where dimensions, covering, ground conditions or traffic load mean that the pipe must be dimensioned for extra strength.