Gravity Liner Solution

Folded & Formed Plastic Pipe (FFPP™)

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Trenchless Rehabilitation of gravity Pipes

FFPP (FOLDED AND FORMED PLASTIC PIPE) GRAVITY LINER SOLUTIONS

At ASOE we offer a gravity liner solution which is fully structural, smooth and close fit, perfect for sewer and stormwater pipelines. Our liner is made from a type of modified PVC compound designed and synthesized by ASOE and can structurally rehabilitate brick, concrete, grp, reinforced plastic or corrugated metal. This is a perfect solution for pipeline rehabilitation projects, which involve host pipes that cannot be repaired by the traditional remove-and-replace method.

ASOE’s Gravity Liner Solution is used to rehabilitate the following:
  • Stormwater Sewer &
  • Culvert Industrial
 
Our Gravity liners are classified into 2 categories:
  • C-SHAPE FOLD & FORM
  • H-SHAPE FOLD & FORM

Average size of wall thickness

Our Gravity Liners sizes range from DN 100mm to DN 900mm The wall thickness for the smaller diameters starts at 3.5mm and increases to 10.5mm for the larger sizes

Technical Advantages:

  • FFPP is made of ASOE’s special formula, which gives the liner better stiffness and longer service time
  • The liner is pre-made and folded in the factory, so no need for curing or grouting on site
  • Increased pipe flow capacity
  • Ability to install in cold weather
  • We have strict test procedures, including ring stiffness, wall thickness and the elongation at break
  • Quick installation, fast reinstatement
  • No annulus gap between the liner and the host pipe
  • No chemicals are used in the forming process, so zero pollution to the environment

Diameter of Liners

Our H-shape Liner ranges from DN 375mm – DN 900mm.

Our C-shape Liner ranges from DN 100mm – DN 375mm

H Shape Technical Specification

Trenchless Solution Type: Fully structural pipe rehabilitation

ID of host pipe: DN 375mm – DN 900mm

Max Length of each installation: Depends on diameter

Temperature of medium: 60º C (140°F) max

Installation mode: Pull in H-shape Liner

Raw Materials: Modified PVC compound

Tensile strength:  30 Mpa

Flexural modulus: 2000 Mpa

Flexural strength: 50 Mpa

Abrasion resistance: Tailored to specific application

Wall thickness: 3.5mm – 10.5mm

Pulling speed: 30m – 40m per minute 

Service Life: 50 years

C Shape Technical Specification

Trenchless Solution Type: Fully structural pipe rehabilitation

ID of host pipe: DN 100mm – DN 375mm    

Max Length of each installation: Depends on the diameter

Temperature of medium: 60º C (140°F) max

Installation mode: Pull in C-shape Liner

Raw Materials: Modified PVC compound

Tensile strength: 30 Mpa

Flexural modulus: 2000 Mpa

Flexural strength: 50 Mpa

Abrasion resistance: Tailored to specific application

Wall thickness: 3.5mm – 10.5mm 

Pulling speed: 30m-40m per minute 

Service Life: 50 years

   

The Installation process is as follows:

Use an existing manhole to install, no need for extra construction pits

  • Pre – installation CCTV inspection
  • Heat FFPP to soften it
  • Insert the FFPP Liner into the host pipe
  • Use steam to heat and expand the liner
  • Cool the FFPP until it turns hard
  • Post – installation CCTV inspection
  • Reinstatement of Service Connections

The whole process should take app 4-5 hours