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Sodium chloride solution pipeline

FEP fabric backed sheets and liner pipes

The finnish company Muovityö Hiltunen Oy manufactured a 65 m long dual-laminate DN 600 pipeline for the transport of a sodium chloride solution (NaCl).

Figure 1: Pipe segments lined with AGRU FEP GGS sheets

Project Date: 2020
Distributor: Atolli Oy (Fluorotech)
Material: 2.3 mm FEP GGS fabric backed sheets and OD 110 mm liner pipes, FEP welding rod
Medium: Sodium chloride solution (NaCl)
Pressure: 2.5 bar
Temperature: 100 °C
Dimensions: DN 600 pipe segments, DN 100 stub-ends/flanges total length of 65 m

About the project

Large quantities of sodium chloride solution are used in many industrial processes within the chemical industry. It is a source of sodium and chlorine compounds used as feedstocks for further chemical syntheses. Since sodium chloride solution is corrosive to stainless steel and other metal alloys, a long-term dual-laminate solution consisting of the thermoplastic liner material FEP (Fluoroethylene-Propylene) and an outer fibre-reinforced plastic (FRP) structure was chosen. While the outer FRP structure bears the mechanical load, the FEP liner material guarantees the chemical resistance and leak-tightness against the media.

Muovityö Hiltunen Oy constructed 19 DN 600 mm pipe segments each with 3.4 m length and with approximately 100 stub-ends and flanges resulting in a total length of 65 m.

pipe segment FEP inliner — Figure 2: Inside view of a pipe segment (FEP inliner)

The liner material FEP

FEP, which is a fully fluorinated thermoplastic, offers outstanding chemical resistance. It performs reliably over the enormous temperature range of -190 °C to +205 °C, and can therefore be used in numerous industrial applications. Flexibility, thermosformability and optimal welding properties ensure easy fabrication of tanks and appa-ratus made from AGRU FEP products.

Fluoropolymers are also distinguished by their extremely low surface tension and thus their antiadhesive qualities. As a result, fluids pearl off the hydrophobic surface allowing to empty tanks and pipework with a minimum of residues.

Figure 3: Pipe segment with stub-flanges

Dual-laminate constructions with fabric backed products

AGRU offers a wide range of semi-finished products including fabric backed sheets and pipes. During the produc-tion process a fabric backing is embedded into the polymer which later ensures an optimal bonding strength between the liner material and its FRP structure. Fabric backed products provide long-lasting solutions for a variety of applications thanks to chemically resistant fabrics made of various materials like polyester, synthetic or glass fibres.

AGRU fabric backed semi-finished products are available out of all our materials, be it PE, PP, PVDF, ECTFE, FEP or PFA. A comprehensive product portfolio and extensive stock-keeping makes AGRU a one-stop shop for manufacturers of the industry.

Advantages of AGRU FEP GGS fabric backed sheets, liner pipes and dual-laminate constructions

AGRU FEP has an outstanding chemical resistance to almost any chemical media
AGRU FEP performs reliably over an enormous temperature range
Flexibility, thermoformability and optimal welding properties ensure easy fabrication of tanks and apparatus made from AGRU FEP products
In general dual-laminate applications are suitable for operation temperatures of up to 180 °C (depending on the composition of material and chemical), even under vacuum

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