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Expansion Joints
Crucial Components of Expansion Joints
Metal expansion joints (they also called compensators) are compensating elements for thermal expansion and relative movement
in pipelines, containers and machines. They consist of one or more metal bellows, connectors at both ends, and tie rods that
depend on the application. They are differentiated according to the three basic types of movement: axial, angular and lateral
expansion joints.
Bellows (Elastic vessels): The Built-up of a bellows is complex in that it involves an evaluation of pressure capacity, stress due to
deflection, fatigue life, spring force and squirm. The determination of an acceptable design is further complicated by the numerous
variable involved such as diameter, material thickness, pitch , height, number of piles, method of reinforcement , manufacturing
technique , material type and heat treatment. In many cases the design for particular application will involve of conflicting
requirement.
Control Rod: Devices, usually in the form of rods or bars, attached to the expansion joints assembly whose primary function is to
distribute the movement between the two bellows. Control rods are not designed to restrain bellows pressure thrust.
Limit rod: Device, usually in the form of rods or bars, attached to the expansion joint assembly whose primary function is to restrict
the bellows movement range (axial, lateral and angular) during normal operation.
Tie Rods: Devices usually in the form of rods or bars, attached to the expansion joints assembly whose primary function is to
continuously restrain the full bellows pressure thrust during normal operation while permitting only lateral deflection. Angular
rotation can be accommodated only if tie rods are used located 90 opposed to the direction of rotation.
Cover: A device used to provide limited protection of the exterior surface of the bellows of an expansion joint from foreign objects
or mechanical damage. A cover is sometimes referred to as shroud.
Equalizing and reinforcing rings: Devices used on some expansion joints fitting snugly in the roots of the convolutions. The primary
purpose of these devices is to reinforce the bellows against internal pressure.
Flanged Ends: The ends of expansion joints equipped with flanges for the purpose of bolting the expansion joint to the mating
flanges of adjacent equipment or piping.
Internal Sleeve: A device which minimizes contact between the inner surface of the bellows of an expansion joint and the fluid
flowing through it, these devices have also been referred to as liners or baffles.
Motion indicators: Device attached to an Expansion Joint for the purpose of indicating the movement of the Expansion Joints.
These devices are useful in determination if the piping system is behaving as planned and if actual movements being imposed upon
the bellows are within the limits of the original design criteria.
Pipe alignment guide: A pipe alignment guide is the form of framework fastened to some rigid part of installation which permits the
pipe line to move freely only along the axis of the pipe.
Purge connections: Purge connections where required, are usually installation at the sealed end of each internal sleeve of an
expansion joint for the purpose of injecting a liquid or gas between the bellows and the internal sleeve to keep the area clear of
erosive and corrosive media or solid that could pack the convolution.
Stabilizer: A device, internally or externally attached to the expansion joint assembly, whose primary function is to increase the
stability of a universal Expansion joint assembly.
Weld Ends: The ends of an expansion joints equipped with pipe suitably beveled for welding to adjacent equipment of piping.
Types of bellows expansion joints
Single Bellows Assembly
For absorption of extension/compression low-pressure piping, exhaust piping, ducts, flues, etc. and for vibration absorption
of suction and exhaust pipes of engines and blowers, and at the inlet and outlet of pumps, Operating Pressure range - 0.1MPa
to 0.3Mpa.
NominalDiameter (A)
DesignPressure
(MPa)
InnerDiameter
(mm)
OuterDiameter
(mm)
Thickness(mm)
Number ofConvolution
AxialDisplacement
(mm)
Spring Rate Per Convolution.(N/mm cov.)
OverallLength(mm)
50
65
80
100
125
150
200
250
300
350
400
450
500
550
600
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
50
64
78
100
128
152
201
251
301
340
385
435
485
535
585
80
100
114
135
168
205
270
335
395
410
465
515
575
625
685
0.8
0.8
1.0
1.0
1.0
1.0
1.2
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
10
10
15
15
15
12
12
12
12
12
10
10
9
9
9
210
230
340
340
420
470
630
720
840
580
590
590
610
610
620
12.6
17.3
21.4
20.5
27.6
39.4
53.0
61.7
77.1
43.9
48.0
48.0
54.5
54.5
59.3
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
2260.8
1697.8
3864.2
5086.5
4103.2
2010.0
2145.5
2959.0
2455.4
6566.4
4863.7
5433.9
4178.1
4571.2
3593.9
Standard Dimensions
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
Dual Free Type:
For absorption of extension/compression low-pressure piping, exhaust piping, ducts, flues, etc. and for vibration absorption
of suction and exhaust pipes of engines and blowers, and at the inlet and outlet of pumps, Operating Pressure range - 0.1MPa
to 0.3Mpa.
NominalDiameter (A)
DesignPressure
(MPa)
InnerDiameter
(mm)
OuterDiameter
(mm)
Thickness(mm)
Number ofConvolution
AxialDisplacement
(mm)
Spring Rate Per Convolution.(N/mm cov.)
OverallLength(mm)
50
65
80
100
125
150
200
250
300
350
400
450
500
550
600
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
50
64
78
100
128
152
201
251
301
340
385
435
485
535
585
80
100
114
135
168
205
270
335
395
410
465
515
575
625
685
0.8
0.8
1.0
1.0
1.0
1.0
1.2
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
10 + 10
10 + 10
15 + 15
15 + 15
15 + 15
12 + 12
12 + 12
12 + 12
12 + 12
12 + 12
10 + 10
10 + 10
9 + 9
9 + 9
8 + 8
390
430
620
630
760
840
1060
1230
1410
1030
1040
1040
1070
1080
1100
25.3
34.6
42.9
41.1
55.2
78.8
106.1
123.5
154.3
87.9
96.0
96.0
109.0
109.0
118.6
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
2260.8
1697.8
3864.2
5086.5
4103.2
2010.0
2145.5
2959.0
2455.4
6566.4
4863.7
5433.9
4178.1
4571.2
3593.9
Standard Dimensions
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
Single Guide Rod Type:
Mainly used in Gas flow, cold blast, low-pressure steam, and other pipelines based on design engineers recommendations.
Operating pressure range – 0.1MPa to 1Mpa
NominalDiameter (A)
DesignPressure
(MPa)
InnerDiameter
(mm)
OuterDiameter
(mm)
Thickness(mm)
Number ofConvolution
AxialDisplacement
(mm)
Spring Rate Per Convolution.(N/mm cov.)
OverallLength(mm)
50
65
80
100
125
150
200
250
300
350
400
450
500
550
600
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.44
50
64
78
100
128
152
201
251
301
340
385
435
485
535
585
80
100
114
135
168
205
270
335
395
410
465
515
575
625
685
0.8
0.8
1.0
1.0
1.0
1.2
1.5
2.0
2.0
1.5
2.0
2.0
2.0
2.0
2.0
10
10
15
15
15
12
12
13
12
12
10
10
9
9
8
360
390
500
500
610
610
690
850
930
820
840
840
900
910
930
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
2260.8
1697.8
3864.2
5086.5
4103.2
3546.3
4291.8
7247.5
5991.8
6566.4
11925.7
13322.1
10203.7
11162.7
8749.4
Standard Dimensions
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
12.1
16.2.
20.6
19.8
26.2
31.0
40.1
47.9
55.0
40.8
34.4
34.4
38.9
38.9
42.8
Dual Guide Rod Type:
Mainly used in Gas, cold blast, low-pressure steam, and other pipelines based on design engineers recommendations.
Operating pressure range – 0.1MPa to 1Mpa
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
NominalDiameter (A)
DesignPressure
(MPa)
InnerDiameter
(mm)
OuterDiameter
(mm)
Thickness(mm)
Number ofConvolution
AxialDisplacement
(mm)
Spring Rate Per Convolution.(N/mm cov.)
OverallLength(mm)
50
65
80
100
125
150
200
250
300
350
400
450
500
550
600
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.44
50
64
78
100
128
152
201
251
301
340
385
435
485
535
585
80
100
114
135
168
205
270
335
395
410
465
515
575
625
685
0.8
0.8
1.0
1.0
1.0
1.2
1.5
2.0
2.0
1.5
2.0
2.0
2.0
2.0
2.0
10 + 10
10 + 10
15 + 15
15 + 15
15 + 15
12 + 12
12 + 12
13 + 13
12 + 12
12 + 12
10 + 12
10 + 12
9 + 9
9 + 9
8 + 8
570
610
850
850
1030
1050
1190
1480
1620
1390
1390
1390
1490
1520
1550
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
2260.8
1697.8
3864.2
5086.5
4103.2
3546.3
4291.8
7247.5
5991.8
6566.4
11925.7
13322.1
10203.7
11162.7
8749.4
Standard Dimensions
24.2
32.4
41.2
39.6
52.4
62.0
80.2
95.9
110.0
81.7
68.9
68.9
77.9
77.9
85.7
Single Reinforced Type:
Reinforce Expansion a joint is designed for high internal pressure applications. The Expansion Joint is designed with
reinforcement rings located around the outside of the convolution in order to avoid bellows being forced out of shape due to
high pressure. Mainly used in chemical, Steam, hot water and other pipelines, operating pressure range 0.2MPa to 10MPa
NominalDiameter (A)
DesignPressure
(MPa)
InnerDiameter
(mm)
OuterDiameter
(mm)
Thickness(mm)
Number ofConvolution
AxialDisplacement
(mm)
Spring Rate Per Convolution.(N/mm cov.)
OverallLength(mm)
50
65
80
100
125
150
200
250
300
350
400
450
500
550
600
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
50
64
78
100
128
152
201
251
301
340
385
435
485
535
585
80
100
114
135
168
205
270
335
395
410
465
515
575
625
685
0.8
0.8
1.0
1.0
1.0
1.0
1.2
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
390
400
540
550
650
690
820
940
1090
910
910
920
940
950
980
13.3
18.3
23.4
22.1
29.5
40.8
55.5
64.4
81.8
48.7
53.2
53.2
60.9
60.9
66.9
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
2178.6
1640.2
3577.6
4778.0
3892.7
2010.0
2145.5
2959.0
2455.4
6079.3
4549.6
5082.9
3939.2
4309.8
3409.5
Standard Dimensions
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
10
10
15
15
15
12
12
13
12
12
10
10
9
9
8
Dual Reinforced Type:
Dual reinforced type Reinforce Expansion joint application similar to single reinforces type custom is based on process
design engineer. Mainly used in chemical, Steam, hot water and other pipelines, operating pressure range 0.2MPa to 20MPa
NominalDiameter (A)
DesignPressure
(MPa)
InnerDiameter
(mm)
OuterDiameter
(mm)
Thickness(mm)
Number ofConvolution
AxialDisplacement
(mm)
Spring Rate Per Convolution.(N/mm cov.)
OverallLength(mm)
50
65
80
100
125
150
200
250
300
350
400
450
500
550
600
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
50
64
78
100
128
152
201
251
301
340
385
435
485
535
585
80
100
114
135
168
205
270
335
395
410
465
515
575
625
685
0.8
0.8
1.0
1.0
1.0
1.0
1.2
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
10 + 10
10 + 10
15 + 15
15 + 15
15 + 15
12 + 12
12 + 12
12 + 12
12 + 12
12 + 12
10 + 10
10 + 10
9 + 9
9 + 9
8 + 8
650
700
990
990
1160
1160
1390
1600
1860
1600
1580
1590
1650
1670
1700
26.6
36.6
46.9
44.2
59.1
81.7
111.1
128.9
163.6
97.4
106.5
106.5
121.8
121.8
133.9
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
2178.6
1640.2
3577.6
4778.0
3892.7
2010.0
2145.5
5959.0
5455.4
6079.3
4549.6
5082.9
3939.2
4309.8
3409.5
Standard Dimensions
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
Universal Type:
A Universal Expansion Joint is one containing two bellows joined by a common Connector for the purpose of absorbing any
combination of the three basic movements: Axial movement, Lateral deflection and angular rotation. Universal Expansion
Joints are usually furnished with control rods to distribute the movement between the two bellows of the Expansion Joint and
stabilize the common connector; this definition does not imply that only a Universal Expansion Joint can absorb combined
movement. General operating pressure rage 0.2MPa to 2Mpa
NominalDiameter (A)
DesignPressure
(MPa)
InnerDiameter
(mm)
OuterDiameter
(mm)
Thickness(mm)
Number ofConvolution
AxialDisplacement
(mm)
Spring Rate Per Convolution.(N/mm cov.)
OverallLength(mm)
50
65
80
100
125
150
200
250
300
350
400
450
500
550
600
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
50
64
78
100
128
152
201
251
301
340
385
435
485
535
585
80
100
114
135
168
205
270
335
395
410
465
515
575
625
685
0.8
0.8
1.0
1.0
1.0
1.0
1.2
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
10 + 10
10 + 10
15 + 15
15 + 15
15 + 15
12 +12
12 + 12
12 + 12
12 + 12
12 + 12
10 + 10
10 + 10
9 + 9
9 + 9
9 + 9
390
430
620
630
760
840
1060
1230
1410
1030
1040
1040
1070
1080
1100
25.3
34.6
42.9
41.1
55.2
78.8
106.1
123.5
154.3
87.9
96.0
96.0
109.0
109.0
118.6
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
2260.8
1697.8
3864.2
5086.5
4103.2
2010.0
2145.5
2959.0
2455.4
6566.4
4863.7
5433.9
4178.1
4571.2
3593.9
Standard Dimensions
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
NominalDiameter (A)
DesignPressure
(MPa)
InnerDiameter
(mm)
OuterDiameter
(mm)
Thickness(mm)
Number ofConvolution
Angulardisplacement
0( )
Moment.(N m)
OverallLength(mm)
50
65
80
100
125
150
200
250
300
350
400
450
500
550
600
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
50
64
78
100
128
155
200
250
300
340
385
435
485
535
585
80
100
114
135
168
195
250
310
370
410
465
515
575
625
685
0.8
0.8
1.0
1.0
1.0
1.0
1.2
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
250
250
300
250
300
300
400
450
500
500
580
580
620
620
670
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
20.6
24.6
73.5
146.5
188.7
310.8
580.9
1271.6
1342.9
1880.9
1806.0
2518.9
2428.7
3180.3
3014.9
Standard Dimensions
Hinge Type:
A hinged Expansion Joint contains one bellows and is designed to permit angular rotation in one plane only by the use of a pair
of pins through hinge plates attached to the Expansion Joint ends. The hinges and hinge pins must be designed to restrain the
thrust of the Expansion Joint due to internal pressure and extraneous forces, where applicable. Hinged Expansion Joints
should be used in sets of two or three to function properly. Mainly used in Steam, cold water, hot water and other pipelines,
operating pressure range 0.2MPa to 20MPa
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
Gimbal Type:
A gimbal expansion joint is designed to permit angular rotation in any plane by the used of two pairs of hinges affixed to a
common floating gimbal ring. The gimbal ring, hinges and pins must be designed to restrain the thrust of the Expansion Joint
due to internal pressure and extraneous forces, where applicable. Mainly used in Steam, cold water, hot water, high-pressure
steam, warm water, high-pressure gas, and other pipelines operating pressure range 0.2MPa to 20MPa
NominalDiameter (A)
DesignPressure
(MPa)
InnerDiameter
(mm)
OuterDiameter
(mm)
Thickness(mm)
Number ofConvolution
Angulardisplacement
0( )
Moment.(N m)
OverallLength(mm)
50
65
80
100
125
150
200
250
300
350
400
450
500
550
600
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
50
64
78
100
128
155
200
250
300
340
385
435
485
535
585
80
100
114
135
168
195
250
310
370
410
465
515
575
625
685
0.8
0.8
1.0
1.0
1.0
1.0
1.2
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
250
250
300
250
300
300
400
450
500
500
580
580
620
620
670
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
20.6
24.6
73.5
146.5
188.7
310.8
580.9
1271.6
1342.9
1880.9
1806.0
2518.9
2428.7
3180.3
3014.9
Standard Dimensions
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
Straight Pressure Balanced Type
An in-line pressure balanced Expansion Joint is designed to absorb axial and/or lateral movement while restraining the
pressure thrust by means of tie devices Interconnecting the line bellows with outboard compensating bellows also subjected
to line pressure. Each bellows set is designed to absorb the axial movement and usually the line bellows will absorb the lateral
deflection. This type of Expansion Joint is used in a straight run of piping. Mainly used in Steam, Oil, cold blast, steam, and
other pipelines operating pressure range 0.2MPa to 10Mpa
NominalDiameter (A)
Designpressure
(Mpa)
Force applied to fixed point(N)
Overalllength(mm)
300
400
500
600
2.0
2.0
2.0
2.0
26.0
26.0
28.5
32.0
1090
1210
1270
1370
53000
69000
74000
84000
615
655
700
770
205000
309000
466000
658000
Standard Dimensions
Force applied to fixed point
(N)
Overalllength(mm)
Bent pipe pressure balanced type Reference: When double reinforced type(5 convolutions + 5 convolutions) is used
AxialDisplacement
(mm)
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
Bend Pressure Balanced Type:
A Bend pressure balanced Expansion joint design application similar to straight pressure balanced type. Mainly used in Cold
blast, crossover piping and oil piping connections to spherical gas tanks etc, operating pressure range 0.2MPa to 10Mpa
NominalDiameter (A)
Designpressure
(Mpa)
LateralDisplacement
(mm)
Force applied to fixed point
(N)
Overalllength(mm)
300
400
500
600
0.2
0.2
0.2
0.2
26.5
21.5
20.0
19.5
50.0
50.0
50.0
50.0
2100
2700
2930
3230
22000
32000
33000
37000
1200
1500
1500
1500
198000
296000
452000
643000
Standard Dimensions
Force applied to fixed point
(N)
Overalllength(mm)
Bent pipe pressure balanced type Reference: When double reinforced type(5 convolutions + 5 convolutions) is used
AxialDisplacement
(mm)
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
Rectangular Metallic Bellows Expansion Joints
Specializing in the production of cigarette wind pulverized coal pipeline compensator series products. Smoke wind pulverized
coal pipeline compensator mainly has: metal circular compensator metal rectangular right-angle compensator rectangular
rounded compensator (CE waveform) circular 3d compensator 3d ripple compensator (A) 3d ripple compensator (B) three-
dimensional spherical compensator rectangular 3d compensator power transmission compensator rectangular rounded
compensator (YV waveform) circular wave compensator 3d los's compensator circular nonmetal compensator rectangular
nonmetal compensator. Rectangular is mainly used in power plant, which absorb smoke duct larger axial and transverse
displacement. Corrugated pipe using UV wave, rounded (" see rectangular rounded compensator (UV wave) "), considering
actual application occasion, delete parts of the small-bore and heavy-caliber specification and actual cataloging from 800 x
800 ~ 50 x 4200, total 71 specifications.
The specifications, but the series to factory orders separately.
Performance parameters
1, use pressure (p) : - 30 ~ 30kPa
2 \, use temperature (t) : more than 400 ?Three, corrugated pipe materials
Commonly used high resistance decreases 09CuCrNi - A (Gb4171), austenitic stainless steel 0Cr19Ni9 (GB3280) and ordinary
carbon steel Q235 - A (GB700)
High resistance decreases atmospheric corrosion resistance, good performance, recommend using high cost performance.
Connection mode
Interpolation, welding, namely pipeline insert compensator interface, insert the quantity is within 20mm.
Third, the parameters of the need to provide when ordering
Rectangular pipe diameter (A x B);
Corrugated pipe material, the default using high resistance decreases when the other materials, when must explain.
External Pressure Type:
Externally pressurized expansion joints are capable of absorbing large axial movements at higher pressures due to their
bellows being pressurized externally. Absorbing large axial movements require high number of convolutions and this, in turn,
increases the bellows instability. By pressurizing the bellows externally, while keeping the unit pressurized internally, bellows
column instability problem is eliminated. This type of design also protects the bellows from outside medium, any possible
damage during shipping, handling and installation, and from high flow velocities. Mainly used in Steam, hot water, warm
water, and other pipelines operating pressure range 0.2MPa to 1.5 Mpa
NominalDiameter (A)
DesignPressure
(MPa)
InnerDiameter
(mm)
OuterDiameter
(mm)
Thickness(mm)
Number ofConvolution
Angulardisplacement
0( )
Moment.(N m)
OverallLength(mm)
50
65
80
100
125
150
200
250
300
350
400
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
50
64
78
100
128
155
200
250
300
340
385
140
166
166
217
268
319
356
407
458
508
559
0.8- 2ply
0.8- 2ply
0.8- 2ply
1.0-2ply
1.0-3ply
1.0-3ply
1.0-3ply
1.0-3ply
1.2-3ply
1.2-3ply
1.2-3ply
25
25
25
19
16
16
16
16
13
13
13
800
800
800
800
800
800
800
800
800
800
800
25
25
25
25
35
35
35
35
30
30
30
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
+-
105
122.6
148.1
262
230.6
294.2
357
421.8
718
811
867
Standard Dimensions
The bellows must be multi-ply depending on design pressure.
Material type: SUS304, SUS316L
Bellows can be fabricated with other material and variation in sizes as per client requirement.
The bellows must be multi-ply depending on design pressure. Material type: SUS304, SUS316L Bellows can be fabricated with other material and variation in sizes as per client requirement.
Neutral Contraction Expansion Bending Misalignment
Term Description Symbol
Main anchor
Slide anchor
Intermediate anchor
Guide
Direction of
expansion of pipe
Must be resistant to the expansion joint thrust force and
the spring reaction force.
Must be resistant to the expansion joint thrust force and the spring
reaction force but does not restrain the force in the sliding direction.
Must be resistant to the spring reaction force of expansion joint.
Pipe guide device for transmitting smoothly the necessary force for centering
of expansion joint and pipe and movement in the axial direction to the anchor
Examples of application of bellows expansion joints
Basic motions of bellows expansion joints
(Single expansion joints)
Absorption of misalignment
(Universal)
Absorption of misalignment
Self-absorption of thrust force
(Single expansion joint)
Absorption of expansion
and contraction
• For explanation of example of application, please refer to JIS B 2352.
(Double hinge)Absorption of misalignment
Self-absorption of thrust force
(Hinges at 3 points)Absorption of expansion and
contraction in two directions
Self-absorption of thrust force
(Single expansion joints)
Absorption of expansion
and contraction
(Straight Pipe
balanced)Absorption of
expansion & contraction
in two directions
Self-absorption of
thrust force
(Double bent pipe balanced)Absorption of expansion and
contraction in two directions
Self-absorption of thrust force
(Double gimbal)Direction unspecified in lateral direction
Self-absorption of thrust force
INSTIL Technologies Pvt. Ltd.
Office Address: MN-10/12, Kashish Park, Thane (West). 400604
Factory Address: Add MIDC Murbad , J78/J79/J80 Fax: +91 022 25829162
Email: [email protected] / [email protected] / [email protected] Website: www.instil.in
Tel: +91 022 25829162 / 9820559842 / 9869464866
