Kelvion – Shell & Tube Double Safety

Kelvion – Shell & Tube Double Safety


Double tube safety heat exchangers play an important role in applications where preventing media mixing in the event of a leak is paramount. They are widely used and accepted as standard in the chemical industry, power, heavy and light industry, oil & gas, marine, transportation, refrigeration and food & beverage sectors. Kelvion has a long track record in developing ground-breaking technologies always aiming to reach the highest levels of safety, environmental protection and cost-efficient operation. Our expert engineers are fully trained to provide you with the best-in-class solutions tailored to your specific requirements. As industries face ever stricter regulations for safeguarding requirements of environment and water supply, double tube safety heat exchangers are the technology of choice.

Kelvion is a market leader in double tube safety technology, with more than 40 years‘ experience in supplying pioneering solutions that are at the forefront of industry standards. Our product line Shell & Tube Double Safety comprises standard, advanced and customized models, all designed and manufactured in close cooperation with our customers to meet the demands of their applications. We are continuously adapting our range to suit changing market requirements, as well as developing new products.

Double Tubes – Function and Design

Unlike a standard shell & tube heat exchanger with a single wall design, the tubes in double tube safety models have two walls, consisting of an inner and outer tube. They also have two tube sheets at each end. If a tube wall is damaged, the product flows through leakage channels arranged between the double tubes into a leakage collection space and triggers an alarm in the leak detection device. Because the second tube wall remains undamaged, the media are kept separate. This means that the plant operator can continue to run the heat exchanger until the next maintenance, avoiding costly unplanned downtimes, as well as contamination of your process and its equipment.

Safety First with Double Tubes

Kelvion double tube safety heat exchangers are available in different materials or their combinations, depending on application and media. The inner tube is normally plain, while the outer tube has a carved fin profile on the inside. This ensures the contact between the two tubes for optimum heat transfer. It also generates channels between the tubes for leaking media, which are then registered by the leak detector. Depending on the application and different media properties, the outer surface of the outer tube can be executed in a plain or low-fin design.

Product Line Overview

Typical Media Typical Applications Design Data Materials
  • Water
  • Steam
  • Oil
  • Refrigerants and glycol
  • Natural gas
  • Solvents
  • Chemical and toxic media
  • Machine Cooling
  • Thermal oil heating / cooling
  • Natural gas heating and cooling
  • LNG treatment
  • Chlorine liquefaction
  • Ammonia evaporation
  • Polysilicon treatment

  • up to 100 bar, higher on request (shell side)
  • up to 320 bar, higher on request (tube side)


  • -200 to 550°C
    (tube side and shell side)
  • Carbon steel
  • Stainless steel
  • Copper
  • Non-ferrous metals (CuNi)
  • Titanium
  • Hastelloy
  • Super Duplex


Classification societies and Institutions Design Codes Regulations / Certifications
  • Det Norske Veritas – Germanischer Lloyd (DNV-GL)
  • American Bureau of Shipping (ABS)
  • Lloyds Register of Shipping (LRS)
  • Bureau Veritas (BV)
  • Registro Italiano Navale (RINA)
  • Russian Maritime Register of Shipping (RS)
  • China Classification Society (CCS)
  • TÜV
  • AD 2000
  • EN 13445
  • ASME
  • TEMA
  • PED
  • ASME Code Stamp (U)
  • KTA – Certificate
  • EAC – Certificate (TR-TS)
  • SELO (China)
  • CRN (Canada)
  • DIN 2303 Q2
  • Euro Chlor
  • DVGW