Coflexip® Flexible Steel Drain Pipe Systems

TReK STS BV is official distributer for Coflexip® flexible steel drain pipe systems for floating roof storage tanks. The most reliable, simple and cost-effective system available in the market. Typically available in 3”, 4”,and 6” diameter.

The Coflexip® drain system is a fully engineered, 100% maintenance free system with an excellent reliability. It will never interfere with equipment inside the tank, even with the roof in the lowest position.

The unique repeatable lay pattern configuration takes limited space inside the tank. Even though the flexible pipe moves freely, due to its construction it will lay itself on the tankfloor in the same position and pattern when the roof is lowered. The system is one component only, no combinations of moving parts with rigid parts. A very limited extra length is needed, typically the system is only 3 meter longer than the highest roof position.

Coflexip® drain systems are custom engineered for each tank and verified with the customer’s tank specification via computer simulation and analysis. Due to its free movement the system does not induce lateral forces on the floating roof.

Coflexip® will issue a full set of installation drawings, to ensure a long term problem free operation.

Correct Installation is a critical part of the reliability of any drain system. That is why TReK STS will guide the whole installation process from a first verification of the tank construction with an initial measurement, cooperation with a, by the operator appointed contractor, up to a final inspection of the system after the installation is completed.

This system needs very limited space in the tank, typically we need a 3 meter radius free spot around a roofleg in the vicinity of the line from the exit of the sump to the inlet of the nozzle. We have now lay-patterns which will allow low-roofheights as little as 40 cm during operation.

After 36 years, worldwide over 10.000 systems have been delivered. Many of the Coflexip® systems have been in operation for more than 20 years. It is therefore the most suitable system for Condition Based Maintenance programs, where maintenance intervals are expected to increase to 20 – 25 years.

No chemical attack, kinking or gas permeation. Unlike other systems, no ballasting with weight is needed, neither are chains needed to keep the system in its position. It does not cause any mechanical wear on the tankcoating.

If requested, additional inspections can be carried out during the operation of the tank, to determine the condition of the Coflexip® flexible steel pipe.

Why not ask us for an offer? It will give you a free of charge opportunity to experience how we work, and you can find out all reasons why the Coflexip® drain system is the most economical system available in the market today. All we need to start is a tank drawing and the type of product you are storing in the tank, and we will take it from there. You will get a price and an engineering study to show how we would like to build the drainsystem in the tank. No strings attached, no costs involved.

Although norms exist to determine the size of the drains, we all know that looking into the future more severe precipitation is expected. We can calculate the capacity of the drainsystem needed.

Who we are

TReK STS, based in Rotterdam, acts as distributer and agent for products used for refining applications. Having in-depth knowledge of these products, combined with a vast experience, we advise and deliver to our customers in Belgium, Germany and the Netherlands.

Latest News

Liquid Leak Detection Systems

TReK STS is very proud to inform you that we have recently added a new line of products to our portfolio, Liquid Leak Detection systems made by TTK S.A.S.

TTK's concept, intelligent cable sensing, is unique and offers innovative products and tailored solutions for hydrocarbon leaksensing as well as waterleaksensing and in some instances, vapour detection.

Read more about these products at www.ttk.fr


Coflexip® - Flexi France state of the art production facility is located in Le Trait, Normandy, France. Coflexip® is design and market leader, having more than 40 years’ experience in the design, production and installation of flexible pipe systems. Coflexip® is a registered tradename of FlexiFrance SA, part of the TechnipFMC Group, a worldwide multinational with over 45000 employees.

TTK S.A.S. has a 25 years' expierence in designing, manufacturing and installing innovative digital liquid leak detection equipment, and has build its brand name on Quality and Innovation.


Contact us


De Coopvaert Building
Blaak 520
3011 TA Rotterdam

Tel: +31 (0)10 486 8839

E-mail: qstn@trektank.com