Conference on developments in desalination technology
An FRP-reinforced liner pipe consists of the inner liner pipe, the outer FRP-reinforcement and the interface in between, where the bonded connection between the materials is established. FRP reinforced liner pipes have an equal constructive setup of the FRP-duallaminates used to build tanks, scrubbers, columns, reactors and other equipment.
The liner pipe serves for the protection against chemical attack and permeation, the outer FRP reinforcement is responsible for the mechanical strength and bears all loads. Typical wall thicknesses for liner pipes made of melt-extruded fluoroplastics are between 2.3 mm and 5 mm (depends on the material and the diameter). This is in contrast to the thermoplastic pressure pipes, which usually have greater wall thicknesses. While for pressure pipes used without reinforcement, the opperation pressure is defined by the polymer itself, the pressure rating of the liner pipes is given by the FRP reinforcement.
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PVDF HV-Liner are an economical alternative to the traditional fabric backed pipe. The surface-treated PVDF pipe has a threedimensional surface structure that provides an optimal bonding to the FRP pipe. The piping systems are available in PVDF, PVDFFLEX and PVDF-el ESD. The pipes can be produced in diameters OD 20 – 400 mm, as well as injection-moulded HV-Liner parts from OD 20 mm – 200 mm.
Mostly neutral and acidic media, up to approx. 120 °C, anti-static applications.
SK+ fabric backed ECTFE pipes are characterised by outstanding resistance to chemicals and hydrolysis, even at high temperatures. Due to the high resistance of the SK+ laminate, it is the preferred system for applications with hydro-chloric acid (HCl) or hydrofluoric acid (HF) up to approx 120 °C.
GGS knitted glass fabric backing is still the industrial standard for a remarkable wide selection of media also in the hottest and most aggressive environments. AGRU GGS is state of the art for fabric backed pipes made of high temperature fluoropolymers.
Highly corrosive media, up to approx. 180 °C for PFA and FEP liner pipes.