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GAB Neumann Annular Groove Graphite Heat Exchangers

Mersen GAB Neumann Graphite Annular Groove heat exchangers are specially designed for use as coolers or heaters for highly corrosive liquid media.
Mersen GAB Neumann Graphite Annular Groove heat exchangers are specially designed for use as coolers or heaters for highly corrosive liquid media.

  • Annular Groove graphite heat exchangers (interchangers) are especially adapted to the heating or cooling of ultra-corrosive liquid chemicals. 

    This specific design allows for heat recovery between two ultra-corrosive fluids. 

    Annular grooves are machined into impervious graphite discs to form the process and service channels. Heat is transferred by conduction through the graphite left between the process and the service channels. Annular groove graphite heat exchangers consist of a stack of graphite discs that are fused together.

  • Snapshots

    Ringnutscheibe
    Graphitstutzen Ringnutwärmetauscher
    Graphit Ringnutwärmetauscher

  • Materials

    • Impregnated graphite: grades GAB GPX1, GPX1T or GPX2 
    • Pressure plates and flanges: carbon steel or stainless steel (optional) 
    • Tie rods, bolts, nuts, washers, springs: Stainless steel

  • Design

    • Totally modular design: number of discs, size of discs and number of passes can be adjusted
    • Impervious graphite discs with annular groove (spiral)
    • Maximum disc diameter: 900 mm
    • Three different groove widths possible
    • Parallel groove arrangement from 1 to 21 grooves
    • Wavy groove design for increased turbulence (optional)
    • Graphite nozzles on product and utility sides
    • Thermal expansion compensation ensured by tie rods and helical springs

  • Key Features

    • Design pressure: -1 barg (full vacuum) to +10 barg (145 psig)
    • Design temperature: -60 to +200°C (-76 to 392°F)
    • Heat transfer area: 0.3 to 55 m2 (3 ft2 to 592 ft2)
    • Design: according to European Pressure Equipment Directive 2014/68/EU (PED) or ASME Code

  • Optional features

    • Carbon-fiber reinforcement (optional)
    • ATEX version

  • Key Benefits

    • Outstanding corrosion resistance on one side (RA series) or on both sides (WA series)
    • Superior heat transfer performance thanks to adjustable cross sections on both sides that guaranty a high level of turbulence
    • Gasket-free design (fused discs)
    • Resin-free surfaces (impregnation before machining) prevents release of black particles
    • Self-cleaning design prevents fouling and clogging
    • High operational safety
    • Highly reliable equipment therefore low cost of ownership and low maintenance cost
    • Compact and robust design
    • Short lead time
    • Long lifetime

  • Main Applications

    • Heat recovery
    • Heating or cooling of ultra-corrosive chemicals
    • Heat transfer between two ultra-corrosive chemicals
    • Best suited for single purpose units

  • 3D Pictures

    • Querschnitt eines Ringnut-Graphit-Wärmetauschers

      Cross section of an annular groove graphite heat exchanger

      3D representation

      GAB Neumann's heat exchangers consist of a series of annular grooves machined on each side by impregnated graphite disks.

    • Ringnutwärmetauscher

      Graphite Annular Groove Heat Exchanger

      with special snake groove channel system

      GAB Neumann's unique serpentine groove design improves the already turbulent flow in the annular groove channels.

    • Ringnutscheibe 3D

      Annular Groove Heat Exchanger Disc

      Top View

      Spiral channels are milled into a disk of impregnated graphite.

    • Ringutscheibe 3D Kanäle

      Annular Groove Heat Exchanger Disc

      Product and service channels

      Annular groove channels are incorporated on both sides in a disc made of impregnated graphite.

  • Working Principle

    How does a graphite annular groove heat exchanger work?

    Annular groove heat exchangers transfer heat from one liquid medium to another liquid medium without direct contact between fluids. For material properties, cost and efficiency reasons, annular groove heat exchangers are not manufactured out of any material other than impervious graphite.

    The thermal performance of annular groove heat exchangers can vary significantly. It is therefore essential to select the type and size of heat exchanger that are the most adapted to the specific application and industrial process. There are a number of considerations including flow rate, pressure drop, risk of erosion, design pressure and temperature, material compatibility, fouling, and many more that should be taken in account.

  • Video

    What is a graphite annular groove heat exchanger and how is it manufactured?

  • Our experts' answers

    What are the 5 main features?

  • Downloads

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Mersen designs and manufactures graphite cylindrical block Polybloc®, graphite shell and tube heat exchanger, cubic block heat exchanger, graphite plate and annular groove heat exchangers. We also manufacture graphite columns and graphite quenches. We propose a complete range of silicon carbide block, and shell and tube heat exchangers as well as steam jet vacuum pumps. We offer PTFE lined columns and vessels, as well as PTFE-lined steel pipes and fittings, and PTFE bellows We supply a complete range of graphite busting discs. We manufacture process equipment in reactive metals such as titanium, zirconium and nickel alloys. 

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