In large projects, every start-up of a pump, compressor, or turbine sends a wave of vibration and mechanical shock through the piping. If left unchecked, it loosens bolts, compromises sealing, and can shut equipment down. An industrial vibration/expansion joint is the engineered answer: a flexible element that absorbs vibrational energy, extends the life of rotating equipment and piping, and cuts unplanned downtime. Within this field, AMA vibration joints—backed by innovation and long experience in piping equipment—stand out as a leading option in the domestic market.
AMA brand origins
AMA’s story began in the 1980s in a small machining shop where the founder learned industrial manufacturing alongside formal studies. The path evolved from raw parts to designing and producing industrial valves under the VIG brand, with a milestone contribution to the national Karkheh Dam project. A second turning point came in the 2000s amid water-scarcity challenges: AMA pivoted into elastomers, culminating in 2014 with the invention of a smart rubber expansion joint featuring active damping control—reported as the first registered example in Iran and even in global markets. Today, AMA’s factory integrates rubber mold lines, vulcanizing presses, precision welding, and an independent QA unit to deliver a full range of rubber and metal bellows expansion joints under one roof.
AMA product portfolio
1) Rubber expansion joints
- Structure: Composite body of natural/synthetic rubber reinforced with nylon or polyester cords; cast-iron or steel flanges; galvanized tie rods on high-pressure models.
- Benefits: Simultaneous absorption of vibration, noise, and axial/lateral movement; low weight; strong chemical resistance; no galvanic corrosion.
- Smart model: A tunable electronic layer adapts the damping ratio in real time to vibration intensity—ideal for dynamic lines with variable duty.
| Color/Type | Nominal Pressure (bar) | Operating Temp (°C) | Recommended Application |
|---|---|---|---|
| Yellow | 10 | 0–60 | HVAC and building services |
| Blue | 16 | 0–60 | General industrial piping |
| Red | 16–25 | 0–90+ | Oil, gas, and petrochemicals |
| Dual-mark (Blue/Red) | 16–25 | 0–90+ | Variable pressure & temperature |
| Smart | Adaptive | up to +100 | Severe shock and high-vibration lines |
2) Metal bellows expansion joints
- Body materials: Stainless steel 304/316 or special high-temperature/corrosion-resistant alloys.
- End connections: Flanged PN16–PN40 or weld ends for full integrity.
- Configurations: Cost-effective single-ply or safer dual-ply for shock pressures; optional limit rods.
- Operating envelope: High pressures to tens of bar and temperatures of several hundred °C for steam, hot oil, and process gases.
AMA Smart Technology: beyond passive damping
In the smart rubber joint, embedded sensors monitor vibration across a wide frequency band. An onboard controller commands changes in dynamic stiffness within the active polymer layer, optimizing energy absorption in real time. The results are tangible: lower flange-connection stresses, fewer premature bolt failures, and steadier equipment performance across extended duty cycles—an excellent fit for fluctuation-heavy lines in refineries and combined-cycle power plants.
Key technical advantages
- 10-year warranty: Signals robust design and continuous quality control.
- Prime materials: Anti-aging rubber compound, high-tenacity polyester cord, and flanges to EN 1092-1.
- 100% final inspection: Hydrostatic test, bend test, and micrometer visual checks on every unit.
- Custom builds: Diameters beyond DN 1200, special alloys for acidic/brackish media, and non-standard effective lengths to customer drawings.
- Engineering services: Modal analysis of piping, installation location advice, and technical documentation for EPC approvals.
Industrial applications: real-world scenarios
- Southern gas refinery: Replacing worn 20-bar line joints with AMA dual-ply bellows cut flange failures by 48% over one operating cycle.
- Thermal power plant: A DN 250 smart joint on a boiler feed-water pump reduced turbine-hall noise by 12 dB and eliminated weekly bolt-retightening rounds.
- 40-story residential tower: Yellow-series rubber joints on the central chiller stopped vibration transmission to slabs and improved acoustic comfort.
- Cement plant: Rubber joint with special anti-abrasion lining on slurry service doubled service life versus the previous imported unit.
AMA vs. notable domestic & imported competitors
| Key Feature | AMA | Erte’ashat San’ati Iran | Novin | Generic Imports |
|---|---|---|---|---|
| Smart vibration control | Yes | No | No | No |
| Rubber joint pressure/temperature | 10–25 bar / 100 °C+ | 6–16 bar / 70 °C | 6–16 bar / 70 °C | Variable, often lower |
| Official warranty (years) | 10 | 5 | 3 | Usually none |
| Documented standards | ISO + national patent | ISO | ISO | Unclear / questionable CE |
| Custom design capability | Yes | Limited | Limited | Generally no |
| Engineering consultancy | Specialized | Medium | Limited | None |
R&D outlook
AMA’s R&D unit partners with local universities on basalt-fiber polymer composites and metal additive manufacturing for complex bellows. An ongoing project is refining the smart-joint control algorithm for faster response to low-frequency vibration—keeping the brand at the forefront of piping innovation.
About Tamam Baha Industrial
Tamam Baha Industrial is one of AMA’s active suppliers, stocking a full range of rubber and metal-bellows models and providing technical support, sizing advice, and spare-parts supply. AMA also operates a broad distribution network; Tamam Baha is one authorized seller among others, and buyers may source AMA products through additional official channels.
