|
Heat Exchanger
Model |
Construction |
Advantages |
Limitations |
AEM
BEM |
Non-removable Bundle,
Fixed Tubesheet |
1. Less
costly than removable bundle heat exchangers.
2. Provides maximum heat transfer surface per given shell and tube
size.
3. Provides multi-tube-pass arrangements. |
1. Shell
side can be cleaned only by chemical means.
2. No provision to correct for differential.
thermal expansion between the shell and tubes.
*Exception—Expansion of shellside expansion joint. |
AEW
AEP
BEW
BEP
CEW
CEP |
Removable
Bundle,
Packed Floating
Tubesheet |
1.
Floating end allows for differential thermal expansion between the
shell and the tubes.
2. Shell side can be steam or mechanically cleaned.
3. Bundle can be easily repaired Or replaced.
4. Less costly than full, internal floating head type
construction.
5. Maximum surface per given shell and tube size for removable
bundle designs. |
1. Shell
side fluids limited to nonvolatile
and/or non-toxic fluids. i.e. lube oils. hydraulic oils.
2. Tube side arrangements limited to one or two passes.
3. Tubes expand as a group. not individually
(as in U-tube unit) therefore sudden
shocking should be avoided.
4. Packing limits design pressure and temperature. |
AET
BET
CET |
Removable
Bundle,
Pull-Through Bolted
Internal Floating Head Cover |
1. Allows
for differential thermal expansion between the shell and the
tubes.
2. Bundle can be removed from shell. for cleaning or repairing
without removing the floating head cover.
3. Provides multi-tube pass arrangements.
4. Provides large bundle entrance area.
5. Excellent for handling flammable and/or toxic fluids.
|
1. For a
given set of conditions, it is the most costly of all the basic
types of heat exchanger design.
2. Less surface per given shell and tube size. |
AES
BES
CES |
Removable
Bundle,
Internal Clamp Ring
Type Floating Head
Cover |
1. Allows
for differential thermal expansion between the shell sod toe
tubes.
2. Excellent for handling flammable and/or toxic fluids.
3. Higher surface per given shell and tube size than
"T" type.
4. Provides multi-tube pass arrangements. |
1. Shell
cover, clamp-ring and floating head cover
must be removed prior to removing the bundle. Results in higher
maintenance cost.
2. More costly than fixed tube sheet or U-tube heat exchanger
designs. |
AEV
BEV
CEV |
Removable
Bundle,
U-Tube |
1. Less
costly than floating head or packed floating tubesheet designs.
2. Provides multi-tube pass arrangements.
3. Allows for differential thermal expansion between the shell and
the tubes, as well as between individual tubes.
4. High surface per given shell and tube size.
5. Capable of withstanding thermal shock. |
1. Tube
side can be cleaned only by chemical means.
2. Individual tube replacement is not practical.
3. Cannot be made single pass on tube side, therefore, true
counter-current flow is not possible.
4. Tube wall at U-Bend is thinner than at straight portion of the
tube.
5. Draining tube side difficult in vertical (head up) position. |
