hx report 1

8/8/2019 HX REPort 1

1/11

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

LONGITUDINALBAFFLE

M FIXED TUBESHEET,

LIKE 'B' STATIONARY

HEAD

C CHANNEL INTEGRAL

WITH TUBE- SHEETAND REMOVABLE

COVER

Shown: Removable Tube

Bundle only

G SPLIT FLOW M FIXED TUBESHEET,

LIKE 'C' STATIONARYHEAD


2/11

C Shown: Fixed Tube sheetonly

H DOUBLE SPLITFLOW

P OUTSIDE PACKEDFLOATING HEAD

DSPECIAL HIGH

PRESSURE CLOSURE

J DIVIDED FLOW S FLOATING HEAD WITHBACKING DEVICE

(SPLIT RING)

K KETTLE TYPEREBOILER

T PULL THROUGHFLOATING HEAD

U U-TUBE BUNDLE


3/11

W PACKED FLOATING

TUBE SHEET WITHLANTERN RING

Some Examples of the TEMA Designationfor Heat Exchangers:

BEM Bonnet (Integral Cover), One Pass Shell, Fixed Tube sheet Bonnet

BEM This is the same type of heat exchanger as above, but with one tube pass.

AEM Channel with Removable Cover, One Pass Shell, Fixed Tube sheet Bonnet


4/11

AES Channel and Removable Cover, One Pass Shell, Floating Head with Backing Device

TEMA Type BEP or AEP:

Construction:

Available in TEMA B, C, or R construction

Removable bundle.

Straight tube

Skirt type packed floating tube sheet

Applications:

Recommended for:

Hydrogen

Oxygen

Air

Nitrogen

Hydrocarbon gases
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5/11

Gases with low molecular weights

Advantages:

Floating end allows for differential thermal

expansion between the shell side and tube side,

eliminating the need for a costly expansion joint

Well-suited to higher pressure, gas in the tube

units, and low molecular weight gas units

Intermixing of shell and tube fluids is unlikely

Provides maximum heat transfer surface and

high thermal efficiency.

Multi-pass tube side designs are available

Straight tubes can be easily cleaned

Tube bundle can be easily removed for cleaning shell side, repairing or replacing.

Limitations:

>Maximum shell side design pressures are generally limited to 150 PSIG

Gases, except for low pressure air and nitrogen, should be kept on the tube side

General Specifications:

Shell Side:

Sizes from 6" to 44" Diameter

Pressures: 150 PSIG standard

Temperatures: 250 degrees F standard, up to 375

degrees F available

Tube Side:

Tube sizes 5/8" OD to 1" OD

Pressures: Up to 3000 PSIG

Temperatures: 300 degrees F, up to 600 degrees F available


6/11

TEMA Type BEW or AEW (OR)

Construction

Available in TEMA B, C, or R construction

Removable bundle

straight tube

full floating head with double O-ring seal

Applications:

Recommended for:

Oil

Water

Air

Nitrogen

Dry Carbon Dioxide

Other inert gases

Should not be used for:

Hydrocarbon gases

Hydrogen

Oxygen

Lethal gases

Gases with low molecular weights

Volatile, toxic, or flammable fluids

Advantages:
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7/11

Tube bundle can be easily removed for cleaning shell side, repairing or replacing


Double O-ring seal allows tube bundle to expand and contract freely

Prevents intermixing of shell and tube side

fluids.

Telltale holes are provided in the O-ring retainer

for leak detection

Most cost-effective floating head type

construction.

All gasket joints are exposed for easy

observation of leaks.

Limitations:

Maximum number of tube passes is two

Fluid intermixing is possible in the event of an O-ring failure

Maximum temperatures are limited


Shell Side:

Sizes from 6" to 44"

Pressures: Up to 550 PSIG for units up to 12 diameter

Up to 300 PSIG for units 14 diameter and greater

Temperatures: Up to 375 degrees F

Tube Side:

Tube sizes 3/8" OD to 1" OD

Material: Admiralty and copper alloys, carbon steel, stainless steel, monel and others

Pressures: Up to 1000 PSIG for sizes 6" to 16"; up to 300 PSIG for sizes over 16"

Temperatures: Up to 375 degrees F

TEMA Type BEU or AEU


8/11

Construction:

Removable bundle U-tube

Full floating bundle

ASME and TEMA "B", "C" or "R" construction

Application:

Recommended for gas & liquid services.

For oil and other viscous fluid heaters with

steam on the tube side.

Advantages:

No packed joint to leak and contaminate fluid

Gasket joints are minimized

Provides multi-pass tube designs

U-bends allow for differential thermal expansion

Less costly than packed floating head or floating head

designs, especially for higher tube side pressured since

there is only one tube sheet, shell flange and head

Limitations:
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9/11

Should be avoided where the tube side fluid is dirty or fouling since tubes can only be

cleaned by chemical means.

True counter-current flow cannot be obtained since single pass on the tubeside is not

possible.

Cannot be used where a temperature cross exists.


Shell Side:

Pressures: 150 PSIG standard, up to 1200 psig available

Temperatures: 300 degrees F standard, up to 600 degrees F available

Tube Side:

Pressures: 150 PSIG up to 3000 PSIG


TEMA Type BEM or AEM

Construction:

Available in TEMA "B", "C," or "R" construction

Fixed tube sheet,

Non-removable bundle

Straight tube

Application:

Any clean fluid on the shell side

Lube oils

Hydraulic oils
http://www.auroraindustrialmachining.com/public/userfiles/images/BEM-main.jpg


10/11

Most chemicals

Acids

Refrigerants

Steam

Other gases

Advantages:

No shell side gaskets or packing


Provides multi-pass tube side arrangements

Less costly than removable bundle units

Limitations:

Tube bundle is not removable for cleaning or replacement

Shell side can only be cleaned by chemical methods

No provision for thermal expansion between shell and tubes unless and expansion joint is

used.


Shell Side:

Pressures: 150 PSIG standard, up to 600 PSIG available


Tube Side:

Pressures: 150 PSIG standard, up to 3000 PSIG available

Temperatures: 300 degrees F standard, up to 600 degreed F available

TEMA Type BES or AES


11/11

Construction:

Available in TEMA "B", "C", or "R" construction

Removable bundle Internal clamp ring

Full floating head

Straight tube

Can be designed to comply with API-660.

Application:

Refinery services

Flammable fluids

Toxic fluids

Advantages:

Full floating head provides for differential thermal expansion between the shell and tubes

Straight tubes can be cleaned

Limitations:

Difficult to remove tube bundle resulting in higher maintenance costs.

The internal floating head cover gasket is not visible for detection of possible leaks.

More costly than U-tube or floating head designs
http://www.auroraindustrialmachining.com/public/userfiles/images/AES-main.jpg

hx report 1

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