Space Flight Hardware

Shell And Tube Heat Exchangers

Glass Shell and Tube Heat Exchangers are of recent development.  These heat exchangers can be used for condensation of vapours, vaporisation, cooling and heating of liquids.

The shell and tube heat exchangers are available in various combinations of Glass/Metal/FRP in shell or headers.  Glass shells are constructed using standard glass components like pipe section, tee, cross, etc.  Metal shells are generally constructed of MS in one piece.

Shell and tube heat exchanger consists of a cylindrical shell which houses a glass tube bundle.  Tubes are sealed with shell with the help of PTFE tube sheets.  Each tube is individually sealed by 'O' ring in tube sheets at both ends.  Baffles are provided in the shell to maintain state of turbulence of fluid as well as to hold the tubes.

Shell and tube heat exchangers have come out to be more advance and beneficial for its following advantages :

- Bigger heat transfer area in one unit.
- Less pressure drop.
- Stuffing box sealing allows easy tube replacement.
- Less maintenance.

Technical information
All the shell and tube heat exchangers are constructed with 12mm OD, 1.5mm thick glass tubes.  These tubes are arranged in triangular pitch of 21mm.  Baffles are provided with 30% cut at a distance of approximately equal to inner diameter of shell.  Generally, PTFE baffles are used in Glass shells and PP baffles in Metal shells.

Shell and tube heat exchanger can be operated within a temperature range of ~ 40°C to 150°C on either side.  However, differential temperature should not exceed 120°C at any point.  All the Shell and tube heat exchangers can be used predominantly under full vacuum, provided differential pressure does not exceed 3 bar g.

The range of overall heat transfer co-efficient in the Shell and tube heat exchangers are considered as follows:

Condensation   :   Water - Water                   :   600-900 Kcal/m² ,h, °C
Condensation   :   Water - Organic solvents   :   400-600 Kcal/m² ,h, °C
Evaporation     :    Steam - Water                  :   500-900 Kcal/m² ,h, °C
Cooling            :   Water - Water                   :   500-600 Kcal/m² ,h, °C
Cooling            :   Water - Organic solvents   :   250-600 Kcal/m² ,h, °C
Cooling            :   Water - Oil                       :    75-350 Kcal/m² ,h, °C
Cooling            :   Water - Air                       :    25-250 Kcal/m² ,h, °C

DN No. of
Tubes
Cross section Cm² Max. Operating Pressure
Shell
Side
Tube
Side
Tube
Side
Shell Side
Glass Metal
80
100
150
225
300
7
19
37
73
151
23
43
93
189
348
5
12
23
46
96
3.0
2.0
1.5
1.0
0.7
3.0
2.0
1.5
1.0
0.7
3.0
2.0
2.0
2.0
2.0
Metal Shell

Cat.
Ref.
HTAm² DN DN1 N1 N2 L L1 L2 P S H K B Baffles
RMG6/1
RMG6/1.5
RMG6/2
RMG6/3

RMG9/4
RMG9/5
RMG9/6

RMG12/8
RMG12/11
RMG12/14
RMG12/16
RMG12/22

1
1.5
2.2
2.9

4.1
5.2
6.6

8.5
10.8
13.7
16.5
22.2

150
150
150
150

225
225
225

300
300
300
300
300

50
50
80
80

80
100
100

100
150
150
150
150

25
25
50
50

50
80
80

80
80
80
80
80

25
25
25
25

25
50
50

50
50
50
50
50

1050
1400
2000
2500

1900
2350
2850

2000
2550
3050
3550
4550

800
1150
1650
2150

1550
1950
2450

1550
1950
2450
2950
3950

500
900
1350
1850

1250
1600
2100

1200
1600
2100
2600
3600

570
1100
1600
2100

1500
1900
2400

1500
1900
2400
2900
3900

25
25
25
25

25
25
25

25
25
25
25
25

125
125
175
175

175
200
200

225
300
300
300
300

350
600
1000
1200

800
1000
1500

800
1000
1500
2000
2600

104
124
144
138

171
168
183

223
30
288
279
270

6
8
10
14

8
10
12

6
6
8
10
14

Each Shell and tube heat exchanger is supplied with following spares :

DN 150-5 tubes, 4 plugs, 4 brushes, 4 'O' rings, 1 key.
DN 225-10 tubes, 6 plugs, 6 brushes, 6 'O' rings, 1 key.
DN 300-15 tubes, 8 plugs, 8 brushes, 8 'O' rings, 1 key.

Orientation of branches, if other than above, should be specified in order.

Following accessories are recommended to use with Shell and tube heat exchanger :

- PTFE bellows on all nozzles.
- Pressure relief valve.
- Supporting clamps.


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    Phone: (352) 466 0051
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