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    TEMA DESIGNATION


    Front End Stationary Head Shell Type                 Rear End Stationary Head  

      
     
    A CHANNEL
    AND REMOVABLE COVER
        E ONE PASS SHELL     L FIXED TUBESHEET,
    LIKE 'A' STATIONARY HEAD
      
      
     
    B BONNET
    (INTEGRAL COVER)
        F TWO PASS SHELL
    WITH LONGITUDINAL BAFFLE
        M FIXED TUBESHEET,
    LIKE 'B' STATIONARY HEAD
      
      
     
    C CHANNEL INTEGRAL WITH TUBE-
    SHEET AND REMOVABLE COVER

    Shown: Removable Tube Bundle only
        G SPLIT FLOW     N FIXED TUBESHEET,
    LIKE 'C' STATIONARY HEAD
      
      
     
    C CHANNEL INTEGRAL WITH TUBE-
    SHEET AND REMOVABLE COVER

    Shown: Fixed Tube sheet only
        H DOUBLE SPLIT FLOW     P OUTSIDE PACKED FLOATING HEAD
      
      
     
    D SPECIAL HIGH PRESSURE CLOSURE     J DIVIDED FLOW     S FLOATING HEAD WITH BACKING DEVICE
    (SPLIT RING)
      
      
     
        K KETTLE TYPE REBOILER     T PULL THROUGH FLOATING HEAD
      
      
        U U-TUBE BUNDLE
      
      
        W PACKED FLOATING TUBE SHEET
    WITH LANTERN RING
      
      

      
    Some examples of the TEMA designation for Heat Exchangers
      
      
      
    BEMBonnet (Intergral Cover), One Pass Shell, Fixed Tubesheet Bonnet
    Fixed tubesheet heat exchanger. This is a very popular version as the heads can be removed to clean the inside of the tubes. The front head piping must be unbolted to allow the removal of the front head, if this is undesired this can be avoided by applying a type A front head. In that case only the cover needs to be removed. It is not possible to clean the outside surface of the tubes as these are inside the fixed part. Chemical cleaning can be used. Shown is a version with one shell pass and two tube passes.
      
      
      
    BEMThis is the same type of heat exchanger as above, but with one tube pass.
      
      
      
    AEMChannel with Removable Cover, One Pass Shell, Fixed Tubesheet Bonnet
    This is almost the same type of heat exchanger as the first BEM, the removable cover allows the inside of the tubes to be inspected and cleaned without unbolting the piping.
      
      
      
    AESChannel and Removable Cover, One Pass Shell, Floating Head with Backing Device
    Floating Head Heat Exchanger. A floating head is excellent for applications where the difference in temperature between the hot and cold fluid causes unacceptable stresses in the axial direction of the shell and tubes. The floating head can move, i.e. provides the possibility to expand in the axial direction.
    Note that the bundle can not be pulled from the front end. For maintenance both the front and rear end head, including the backing device, must be disassembled. If pulling from the front head is required a type AET should be selected.
      
      


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