Metallic Expansion Joints - Pumps, Valves, Piping and Fittings
Metallic expansion joints are flexible bellows assemblies used in marine pumps, valves, piping and fittings to absorb thermal expansion, vibration, equipment movement and installation misalignment. They are commonly manufactured from stainless steel or nickel alloys and selected according to pressure, temperature, movement and corrosion conditions.
ProShipWorks provides end-to-end support to source and supply Metallic Expansion Joints for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.
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Product Information
| Product Name | Metallic Expansion Joints |
|---|---|
| Product Category | Pumps, Valves, Piping and Fittings |
| Product Reference | 655 |
| Brands / Manufacturers | Witzenmann, Senior Flexonics, BOA Group, MACOGA, EagleBurgmann |
| Unit of Measure | Piece |
Key Features
| Key Feature |
|---|
| 1. Corrugated metallic bellows for axial, lateral or angular movement |
| 2. Absorbs thermal expansion and mechanical vibration |
| 3. Stainless steel construction for marine corrosion resistance |
| 4. Available with flanges, weld ends, liners and covers |
| 5. Designed for seawater, cooling water, exhaust and process piping |
Applications of Metallic Expansion Joints
| Application |
|---|
| 1. Pump and valve connections in seawater and cooling-water systems |
| 2. Engine exhaust, fuel, lube-oil and auxiliary piping |
| 3. Marine HVAC, ballast, fire-fighting and ship-service piping |
Technical Specifications
| Model | Specification | Value | Unit |
|---|---|---|---|
| Axial metallic expansion joint | Bellows material | 304L, 316L, 321 or 254 SMO stainless steel, subject to service | — |
| Axial metallic expansion joint | Connection type | Flanged, welded or threaded connection according to design | — |
| Universal metallic expansion joint | Movement type | Axial and lateral movement; selected by manufacturer calculation | — |
| Hinged metallic expansion joint | Movement type | Angular movement with tie rods or hinges | — |
| Metallic expansion joint | Design parameters | Nominal diameter, pressure, temperature, movement and cycle life are project-specific | — |
Standards, Certifications & Class Approval
Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.
| Applicable Standards & Certification | Design and manufacture may reference EJMA Standards, EN 14917, ASME Section VIII and applicable piping codes such as ASME B31.3 or ISO 15649. Material certificates and pressure testing should comply with the purchase specification. |
|---|---|
| Class Approval | DNV, ABS, Lloyd's Register, Bureau Veritas and ClassNK may accept or approve metallic expansion joints when required by the vessel design, piping system or equipment certification. Approval is generally project- and service-specific rather than universal. |
Installation, Maintenance & Safety Information
| Installation Notes | Confirm movement, pressure, temperature, flow direction and face-to-face dimensions before installation. Keep bellows free from welding spatter and mechanical damage. Do not use the joint to correct major piping misalignment. Install guides, anchors and liners where specified, and remove shipping restraints before operation. |
|---|---|
| Maintenance Tips | Inspect bellows for corrosion, cracks, dents, bulging, leakage and excessive deformation during scheduled inspections. Check flanges, welds, liners, covers, tie rods and nearby pipe supports. Replace the joint if bellows damage or fatigue is detected; metallic bellows are normally not field-repaired. |
| Safety Notes | Isolate, depressurize, drain and cool the piping system before inspection or replacement. Do not stand near a pressurized expansion joint or loosen restraints in service. Verify compatibility with seawater, chemicals, temperature and pressure, and follow the manufacturer installation and operating limits. |
Request a Quote for Metallic Expansion Joints
Contact ProShipWorks for marine or industrial product sourcing, quotations and delivery.
- Vessel name and IMO number
- ETA / vessel schedule
- Berth or vessel location
- Required quantity
- Preferred delivery window
- Shipping agent contact details
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