Tough hose for aggressive fluids


Tough hose for aggressive fluids

Customers in the petroleum and chemical industries asked for a marine hose that could accommodate aggressive fluids and at the same time withstand tough working environments. Trelleborg rolled up its sleeves and came up with the unique Chemiline range. 

The petroleum and chemical industries handle some very pure fluids in their processes. It stands to reason that any peripheral equipment, such as hoses, must not break down and contaminate these fluids, or the processes and the end product quality might be seriously jeopardized.

The fluids handled in these industries are sometimes very aggressive, for example MTBE (methyl tertiary-butyl ether), toluene and xylene, so the hoses used for transport must be very tough if the purity of the fluids is to be safeguarded. 

Raising the bar further, as the fluids are generally transported by sea and have to be transferred from vessels to onshore factories, the hoses also have to be able to withstand an often harsh marine environment without breaking down. 

“We had several customer inquiries for a hose that could handle those requirements,” says Nicolas Landrière, sales engineer at Trelleborg Industrial Solutions. “We listened to the customers and brought their requirements back to our R&D department, which started to develop a suitable, purpose-built solution.”

Relying on Trelleborg’s field-proven technology, the development was carried out by the R&D team in Clermont-Ferrand, France. 

“There were already existing products and technology that could be used as a foundation,” Landrière says, “both in terms of withstanding the sea environment and for handling aggressive fluids.” 

Bringing the two aspects together, the R&D team developed a new inner liner for an existing hose, coming up with the Chemiline hose range. The products are highly resistant to chemicals, featuring a neutral fluoroelastomer (FKM) continuous inner line and an integrated gasket. This way the fluid is only in contact with the hose, which minimizes the risk that it is contaminated by the peripheral equipment. 

The hose also features Trelleborg’s nippleless flange design, which is fully embedded in the rubber. It is attached to a reinforced structure, with steel cable layers and steel rings. The design makes the hose flexible, with a low bending movement, but also makes it highly resistant to tension and collapse. There is no stress concentration in the flange area, which improves working reliability. 

The Chemiline hoses have been fully certified according to GMPHOM 2009 (Guide to Manufacturing and Purchasing Hoses for Offshore Moorings), which provides technical recommendations and guidance for offshore hoses. “The hoses went through comprehensive laboratory tests to secure their performance in seawater in terms of, for example, aging and resistance to chemicals as well as corrosion and low temperatures,” explains David Mayau, technical manager at Trelleborg Industrial Solutions. 

“The petroleum and chemical industries are the primary industries,” says Mayau, “but the Chemiline range can also be used with advantage in the oil and gas industry, where a stronger inner liner is needed for off-loading high aromatic crude oil.”


Trelleborg’s Chemiline hose is a dedicated hose with a continuous FKM inner liner for transfer of aggressive fluids, mainly in the petroleum and chemical industries.

The Chemiline range has a working rated pressure (WRP) of up to 21 bars. The range covers internal diameters from 150 millimeters (6 inches) to 300 millimeters (12 inches) with diameters up to 600 millimeters (24 inches) available on request. Section lengths are available up to 12.2 meters (40 feet). The range includes both floating and submarine versions.   

Main features

  • Flexible and though design
  • High chemical resistance
  • Superior sealing solution
  • Qualified according to GMPHOM 2009

This article has been reproduced from T-Time, Trelleborg's magazine for customers and stakeholders. 

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