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Bellows Short Style

"Matchless" metal expansion joints are commonly used to absorb the movements in piping caused by thermal changes. UNA-FLEX has designed the latest technology to help produce a premium product produced from fully annealed stainless steel sheet rolled into a tube and seam welded.

Short Style:

  • Size (in.): 2 to 144
  • PSI: 50 to 300
  • Overall length: 8 to 5200
  • Force (lbs/in.): 180 to 9430
  • Movement (in): 0.8 to 2.0
  • Lateral movement (in.): 0.1 to0.08

Short Style Specification Chart
SLP - Short Low Pressure
SMP - Short Medium Pressure
SHP - Short High Pressure
DS - Duct Short

     
Style
44 & 66
Style 22
Axial
Lateral
Size
(In.)
Series
PSI
O.A.L.
Weight
O.A.L.
Weight
Force
(lbs./in.)
Move-
ment
(in.)
Force
(lbs./in.)
Move-
ment
(in.)
2

SLP

SMP

SHP

50

150

300

6

8

8

8.2

6

1

1.1

1.3

180

180

600

0.8

305

345

1050

0.1
2-1/2

SLP

SMP

SHP

 

50

150

300

 
6

10.5

10.5

10.7

7

1.8

1.9

2

140

460

840

0.8

500

1506

2525

0.1
3

SLP

SMP

SHP

 

50

150

300

 
6

13.5

13.7

14

9

2.6

2.7

2.9

280

500

1275

0.8

866

944

2610

0.1
3-1/2

SLP

SMP

SHP

 

50

150

300

 
6

14.2

14.5

15

9

2.8

3

3.3

325

726

1396

0.8

1075

1400

3152

0.1
4

SLP

SMP

SHP

 

50

150

300

 
7

15.7

16

16.2

9

3.5

3.8

4

550

699

1135

0.8

1500

1550

3480

0.1
5

SLP

SMP

SHP

 

50

150

300

 
8

21

21.7

22.2

10

6

6.8

7.3

597

775

1500

1.3

2400

2400

7800

0.1
6

SLP

SMP

SHP

 

50

150

300

 
8

22.2

25.2

27

10

8.5

9.5

10

600

978

2000

1.3

2200

2700

7900

0.2

0.1

0.1

8

SLP

SMP

SHP

 

50

150

300

 
8

48.5

53.7

56.7

10

14.5

16

21

625

1060

2900

1.6

2608

6026

8200

0.2

0.1

0.1

 
10

SLP

SMP

SHP

 

50

150

300

 
8

53.7

58.5

63

10

20.5

22

26.8

645

1712

5065

1.6

3040

6275

11375

0.2

0.1

0.1

 
12

SLP

SMP

SHP

 

50

150

300

 
9

87

89

92

10

23

26.3

28.5

615

1428

6310

1.6

3494

6376

18830

0.1
14

SLP

SMP

SHP

 

50

150

300

 
9

103

107

110

12

26

27.8

30

590

1500

7302

1.6

5899

9970

21650

0.1
16

SLP

SMP

SHP

 

50

150

300

 
9

138

143

147

12

29

33

36

604

2100

6100

1.6

9334

14890

38115

0.1
18

SLP

SMP

SHP

50

150

300

10

156

161

166

12

33

39

43

615

2800

6080

1.8

11350

21455

61400

0.1
20

SLP

SMP

SHP

50

150

300

10

162

167

172

14

38

41

49

620

3062

6143

1.8

13600

24010

68350

0.1
22

SLP

SMP

SHP

50

150

300

10

205

210

214

14

40

43

47

680

3100

5000

1.8

17115

30950

71600

0.1
24

SLP

SMP

SHP

50

150

300

11

222

225

230

14

46

49

50

815

3400

9500

1.8

21300

42750

102700

0.1

30

36

40

DS
50
11

377

497

602

14

56

67

72

960

1100

1490

1.8

175000

248000

380000

0.2

42

46

48

DS
50
11

641

750

810

14

84

98

170

1680

1742

3600

2.0

410000

470000

500000

0.2

50

52

54

DS
25
11

900

1008

1061

14

179

210

218

2500

3215

3605

2.0

174900

318000

604000

0.2

60

66

72

DS
25
11

1347

1591

1799

14

242

283

309

4200

4400

4750

2.0

780000

1300500

2800300

0.1

84

96

108

DS
15
11

2137

3916

4200

14

395

460

491

5478

6300

7210

2.0

4610000

12100000

18400000

0.1

126

132

144

DS
15
11

4400

4700

5200

14

565

600

660

8005

8715

9430

2.0

19500000

21000500

25000100

0.08
Design Movements based on 80% axial compression, 20% extension and total lateral offset.
Unaflex Matchless Metal Bellows Expansion Joints Data
  • Metal expansion joints are primarily used to absorb movements in piping caused by thermal changes. Our designs incorporate the latest technology to produce a premium product.
  • Unaflex "Matchless" expansion joint bellows are produced from fully annealed stainless steel sheet rolled into a tube and seam welded.
  • Service: Units are capable of handling Vacuum to 300 PSI.
  • Standard bellows: 321 stainless steel. Other alloys are available to withstand your toughest applications.
  • Standard fittings: welding nipples, fixed and floating flanges.
  • Standard sizes: 2" through 144".
Pressure Thrust

When a bellows is pressurized, it reacts causing a load equal to its effective area X working pressure along its longitudinal axis. These loads must be considered when designing the system arrangement and appropriate anchors.

 

Eff.

Area

 

Eff.

Area

 

Eff.

Area

Size
Sq. In.
Size
Sq. In.
Size
Sq. In.
2
6.3
18
290
52
2290
2-1/2
9.6
20
354
54
2460
3
12.0
22
426
60
3025
4
20
24
500
66
3635
5
30.0
30
775
72
4300
6
43.0
36
1090
84
5800
8
72.0
40
1350
96
7550
10
110
42
1470
108
9510
12
150
46
1775
126
13200
14
180
48
1940
132
14110
16
234
50
2125
144
16750

 

Temperature:

Elevated temperatures reduce both rated movement and pressure capabilities.
To compensate multiply both rated movement and rated pressure by the temperature compensating factor shown in the chart below.

Temperature °F
Temperature Compensating Factor
Temperature °F
Temperature Compensating Factor
Room Temp.
200
300
400
500
1.00
.86
.80
.78
.77
600
700
800
901
1000
.74
.70
.66
.62
.60

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