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An expansion joint is a flexible connector that absorbs vibration and noise at the connections between the pump and the piping and prevents pipe stresses from being transmitted to the pump. Connection size, flange standard, working pressure and movement capacity are evaluated together when selecting a fire pump expansion joint.
According to Ayvaz, vibration absorbers are used at the pump inlet and outlet connections between the piping and the pump. Double-ply bellows vibration absorbers with limit rods prevent pump damage that may result from pipe stresses, absorb vibration and noise at the pump connections and reduce stress and axial misalignment in the system.
The standard MKTY-30 version is manufactured with a double-ply AISI 304 stainless steel bellows, St.37.2 carbon steel flanges and limit rods. With DIN EN 1092/1 PN16 flanges, it has a working pressure of 16 bar and an axial movement capacity of -20/+10 mm. Other bellows materials and flange standards such as ASTM and BS are available on request.
Ayvaz also manufactures rubber expansion joints for pump connections on the suction and discharge lines. Easy to install, the vibration absorbers take up little space in the pump room.
| Specification | Value |
|---|---|
| Model | MKTY-30 – double-ply bellows, flanged vibration absorber with limit rods |
| Nominal Size | DN25 – DN300 |
| Working Pressure | 16 bar |
| Axial Movement | -20 / +10 mm |
| Flange Standard | DIN EN 1092/1 PN16 |
| Bellows Material | AISI 304 stainless steel (options: 309, 316L, 316Ti, 321) |
| Flange / Rod Material | Carbon steel St.37.2 |
| Length (L) | 110 – 150 mm (depending on size) |
Technical values are based on manufacturer documents; confirm against the current data sheet before ordering.
Fire pump suction and discharge flange connections
Vibration isolation at pump, motor and compressor connections
HVAC and industrial facility pipingOther equipment considered together with the Fire Pump Expansion Joint in the fire pump room:
