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Download Acrobat (PDF) Specification Sheet CMS_Advantages_Limitations.pdf (194kb)

Advantages and Limitations

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.

CMS Heat Transfer Division, Inc.

273 Knickerbocker Avenue • Bohemia, NY 11716 USA

Tel: 631-968-0084 • Fax: 631-968-0184 • Email: info@cmsheattransfer.com



CMS Heat Transfer products include shell and tube heat exchangers, fixed tubesheet and u-tube exchangers, oil coolers, pre-heaters, condensers, after-coolers, steam converters, kettles, reboilers and evaporators. CMS engineering include custom heat exchanger, process and mechanical design services to all TEMA and ASME conformance requirements.

IMPORTANT DISCLAIMER: All information provided on this site is for reference. While we make effort to provide accurate information, CMS cannot be held responsible for errors either of omission or typographical.



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