SHELL AND TUBE

Shell & tube heat exchangers offer large surface area in combination with efficient heat transfer and compactness. These are widely used in industries for various duties like cooling, heating, condensation, evaporation etc. GOEL are the pioneers in the field of glass shell and tube heat exchangers in India and their product has a wide market acceptability.

Salient Features of Shell and Tube Heat Exchanger :

1.Universal corrosion resistance an excellent alternative to expensive MOCs like graphite, hastelloy, copper titanium, tantalum and other exotic metals.
2. Excellent heat transfer as fouling does not occur on smooth glass surfaces.
3. Flexibility of installation vertical/horizontal.
4. Easy replacement of tubes for repair and cleaning.
5. Available in wide range of HTAs.
6. Ease of installation due to light weight.
7. Economical.
8. Suitable for applications where large HTAs are required in limited space.

Advantages of Shell and Tube Heat Exchanger Over Conventional Coil Type Heat Exchangers :

1. The overall heat transfer coefficient in shell and tube heat exchanger is about 3 times higher than in coil type heat exchanger.
2. The pressure drop in shell and tube heat exchanger is minimal compared to 2-3 kg/cm2 in coil side of coil type heat exchanger.
3. For requirement of higher heat transfer areas shell and tube heat exchanger is the only alternative.

Construction Features of Shell and Tube Heat Exchanger :

The glass tubes are sealed individually into PTFE tube sheet with special PTFE sockets and packing. This unique ferrule type sealing arrangement permits easy replacement and cleaning of tubes. Baffles on shell side ensure improved heat transfer by increased turbulance. Further details of construction can be seen in the diagram.

TYPE:

Three basic versions * are available :

Material Of Construction of Shell & Tube Heat Exchanger

 Model Shell Tube Header Duty
 RGG Glass Glass Glass For heat transfer between two aggressive media.
 RGM Glass Glass Steel/FRP For heat transfer between aggressive media in shell & non-aggressive media in tubes. 
 RMG Steel/FRP Glass Glass For heat transfer between aggressive media in tubes & non-aggressive media in shell

 * GOEL provides assistance to clients for selecting the right model for specific duty.

* GOEL provides assistance to clients for selecting the right model for specific duty.

Dimensional Specifications of Shell and Tube Heat Exchanger :

Cat.Ref.
 RGG/RMG

6/3

6/4

6/5

6/6

9/6

9/8

9/10

9/12

12/12

12/16

12/21

12/25

Area (m2)

3

4

5

6

6

8

10

12

12

16

21

25

 DN

150

225

300

 DN1

80

100

150

 DN2

50

80

80

 DN3

25

40

40

 DN4

50

50

50

 H1

175

250

300

 H2

150

200

250

 L

2500

3100

3700

4300

2620

3220

3820

4520

2550

3150

3950

4550

 L1

1900

2500

3100

3700

1900

2500

3100

3800

1800

2400

3200

3800

 L2

150

150

150

150

225

225

225

225

225

225

225

225

 L3

1600

2200

2800

3400

1450

2050

2650

3350

1350

1950

2750

3350

 L4

250

250

250

250

300

300

300

300

300

300

300

300

 L5

125

125

125

125

175

175

175

175

175

175

175

175

 L6

1980

2580

3180

3780

2000

2600

3200

3900

1930

2530

3330

3930

 T

50

60

75

 No. of   Tubes

37

73

151

 No. of  Baffles

11

15

19

23

7

9

13

17

5

7

9

11

Range Of Applications :

Permissible temperature range for both shell & tube sides - 40° C to 150° C.
Maximum permissible temperature difference between shell & tube sides 120° C.

All sizes & models are suitable for full vacuum on both side. Maximum limiting pressures are tabulated here below :

   

Maximum Permissible Pressure Range, Kg/cm2(g)

 Model

Side

150DN

225DN

300DN

 RGG

Shell
Tube

2.0
2.0

1.0
1.0

1.0
1.0

 RGM

Shell
Tube

2.0
3.5

1.0
3.5

1.0
3.5

 RMG

Shell
Tube

3.5
2.0

3.5
1.0

3.5
1.0

The above ranges of applications are admissible limiting values. For each specific case GOEL recommends the admissible operating data based on the relations between pressure and temperature, size and model.

Performance & Design Data :

The particular advantage of shell & tube heat exchanger is high heat transfer performance. The relation between heat transfer and velocity of flow can be easily seen in the diagram. On receipt of the operating data from client the most favourable shell and tube heat exchanger is selected. This accurate design combined with most reliable quality assurance ensures economy and operational reliability for the user. For approximate sizing some typical heat transfer coefficients are given here below :

   

U-Values

 Media

Use

kcal/m2hrk

W/m2k300

 DN      
 Steam water

condensation

350-550

410-640 

 Water - water

cooling

250-350

290-410

 Water - air

cooling

30-60

35-70