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Damper Systems

Gas Turbine
Exhaust Systems

Expansion Joints

Expansion Joints
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Metal EJ Metallic Expansion Joints
For petrochemical, power and industrial applications in both round and rectangular shapes. Specializing in critical service custom designs requiring adjoining piping, external hardware, refractory linings, FEA modeling, and non-destructive testing.
Non-Metal EJ Non-Metallic Expansion Joints
For low-pressure ducting applications including power boiler intake and flue gas ducting, gas turbine exhaust systems, petrochemical and various other industrial applications.
Service Field Service and Aftermarket
Our skilled technical field service professionals perform hands-on system walk-downs and evaluations for all types of plants. We specialize in objective, unbiased surveys, and are ready to respond, should you have an emergency situation that requires immediate attention.

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Metallic Expansion Joints

Bachmann Industries Bachmann metallic expansion joints are designed and manufactured in strict accordance with EJMA standards unless specified otherwise. Specializing in custom highly engineered custom designs for critical service applications, we provide solutions for even the most difficult expansion joint challenges.

SPECIFICATION Round Rectangular
Size 16"(406mm)
240" (6100mm)
for shipping
Pressure Full vacuum
500 psig (35 bar)
Full vacuum
25 psig (1.7 bar)
Temperature Cryogenic
2000°F (1093°C)
2000°F (1093°C)
Materials Stainless steel
high nickel alloy
Stainless steel
high nickel alloy
Compliant with
EJMA and
ASME B31.3, B31.1
Yes Yes
Other Specialized custom designs available

Bachmann® Convo-Flex Series High-Performance Round Convoluted Expansion Joints
- Full range of sizes available
- Customization for specific application
- Many accessories available: internal sleeves, hinges, pantographs, covers, two-ply testable bellows, etc.
- Materials selected based on application parameters, including stainless steels and nickel alloys
- Butt-weld and flanged end connections available

Single Type Expansion Joint

Single Type Expansion Joint

Single Type Expansion Joint
The Single Expansion Joint (the simplest expansion joint form of single bellows construction) is usually applied in applications of either straight axial extension or axial compression; however, a combination of axial, with limited amounts of lateral and angular rotation can be accommodated.

Single Type Expansion Joint    Single Type Expansion Joint

Single Type Expansion Joint    Single Type Expansion Joint

Universal Expansion Joint

Universal Expansion Joint

Universal Expansion Joint
The Universal Expansion Joint (articulated double expansion joint-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)usually furnished with control rods to distribute the movement between the two bellows of the expansion joint and to stabilize the common connector.

Overall control rods govern the movement of the center pipe section and equally divide motion between the bellows elements. This configuration is used primarily for lateral deflection but can accommodate axial movement as well. Another application for this type of expansion joint utilizes overall tie rods which fix the overall length of the expansion joint and contain full pressure thrust (Only lateral deflection is accommodated.

Hinged Expansion Joint

Hinged Expansion Joint

Hinged Expansion Joint
The Hinged Expansion Joint (an overall hinge mechanism which when furnished with fixed hinge points allows angular rotation in a single plane) is usually used as a pair separated by a pipe section. The combination in turn absorbs thermal motion in one plane. Used in sets of two or three to function properly. An alternate hinge type expansion joint is the slotted type (one of the hinge members has a slotted hole which allows axial motion and rotation). These hinge devices are usually used as a pair with external anchoring devices provided within the piping system.

Gimbal Expansion Joint

Gimbal Expansion Joint

Gimbal Expansion Joint
The Gimbal Expansion Joint (an extension of the hinge type,allowing rotation in any plane) is used in pairs to accommodate lateral deflection in any plane. The pressure thrust is contained within the gimbal arrangement. The most common use is a three-dimensional system with two gimbals in combination with one hinged expansion joint. This system accommodates thermal motion in three planes.

Custom Engineered Metallic Expansion Joints

Inline Pressure Balanced
Bachmann® Inline Pressure Balanced Expansion Joint
These 36" diameter expansion joints were part of an order for sixteen high temperature units. The expansion joints shown are designed to operate at 15 psig internal pressure at 1800°F.
Bachmann® Steam-Purged Hinged Expansion Joint
This metallic bellows expansion joint was supplied as part of an order for seven expansion joints on the hot oil quench process for a Naptha Cracking Facility. The 24" ID refractory joint was designed for 50 psig at 1200° F and lateral movements approaching 6.5".
Tied Universal
Bachmann® Tied Universal Expansion Joint
This 35-foot long expansion joint was ordered by a wood chip gasification plant. The equipment is subject to very abrasive flow media and designed to operate at 15 psig internal pressure at 2000°F.
Pressure balanced elbow
Bachmann® Pressure Balanced Elbow Expansion Joint
This 90-degree elbow is 78" diameter x 190" long and incorporates an over pressure rupture disc for steam condenser service.
Tied Universal
Bachmann® Tied Universal Expansion Joint
This 114" diameter x 364" joint incorporates a blind tee, 5-piece miter elbow, vane, and 2-ply bellows with monitoring indicators.

Non-Metallic (Fabric) Expansion Joints

Non-metallic (fabric) expansion joints absorb movements caused by thermal changes. They are capable of multi-plane movements in small breach openings and produce very low spring rates. A variety of flexible element materials may be selected for corrosion resistance, temperature requirements, and other specific application requirements.

SPECIFICATION Round or Rectangular
Size Unlimited; field-spliced
for shipping
Pressure +/- 2 psig
Temperature -20°F (-29°C)
2000°F (1093°C)
Materials Elastomers, fluoroplastics,
and composites
Other Specialized custom
designs available

Bachmann® non-metallic expansion joints are a proven solution for tough applications. Each flexible element (molded flanges, flat belt, or diaphragms) is designed for the specified temperature and chemical environment. Each metal frame design (hot frame, cold frame, telescoping liner) has specific longevity and application advantages. Let our experts properly guide you to the best solution.

"A" Style Expansion Joint
Belt-only supply, mounted directly to the customer duct or as a replacement on an existing frame. Bachmann has the capability to deliver emergency replacement belts on a same-day shipment anywhere in the world. Field service technicians are also available for emergencies and installation supervision.

"B" Style Expansion Joint
Hot-molded flange self-sealing elastomer for low-temperature requirements and also fabricated in the composite buildup for the high-temperature applications. This design offers low cost due to eliminating the required metal frame. Installation is also inexpensive because it is mounted directly to the existing duct flange.

"C" Style Expansion Joint
Captive angle to prevent dust accumulation in the joint cavity and is designed to accommodate large lateral movements. The floating angle is in constant contact with the joint frame and liner. Additional insulation may be used to prevent dust fines from entering the joint cavity.

"D" Style Expansion Joint
Designed to accommodate large axial movements and may also include a captive angle. The belt geometry and special insulation mounting provides the proper movement of the flexible elements to reduce stress.

Hinged E-Style for Economizer
in coal fired utility service

"E" Style Expansion Joint
Features overlapping liners for smooth gas flow and to protect the belt and insulation from abrasive particulate. The insulation serves as an acoustic barrier and provides thermal insulation. Bachmann designs the belt for the full gas temperature and uses superior quality materials to provide a long service life.

"EMOD" Style Expansion Joint
Similar features to the "E" style joint, but is used in applications where external bolting to the mating duct flange and fabric mounting is required or preferred. Refractory lining of the Bachmann joints is available for temperature applications to 2300F.

F-Style with liners
for industrial application
"F" Style Expansion Joint
General-purpose design where the belt is mounted to an angle frame. Modified designs may accommodate installation inside or outside existing failed metal expansion joints. This eliminates costly removal of the metal joint and asbestos removal.

"GTJ" Style Expansion Joint
Special patented design specifically to handle thermal stresses from rapid temperature rise in Gas Turbine exhaust applications.

Metal components in the gas stream must be allowed to thermally expand without adverse effect on the adjoining equipment. Cold side frames must be attached independently of the hot liners for proper expansion. A low profile must also be maintained to prevent distortion. Special design of the belt and geometry of the insulation mounting allows proper movement.

Custom Engineered Non-Metallic Expansion Joints

E-Mod Style
E-Mod Style
Bachmann® E-Mod Style Non-metallic Expansion Joint
132" diameter x 24" F/F with refractory lining for 1500° F service.
F Style
Bachmann® "F" Style Non-metallic Expansion Joint
52" x 84" x 18" F/F with pneumatic flange clamps and retraction mechanism.


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