Special axial-type starter bellows expansion joint with a two-piece protective casing. DN 80 to 1600 mm.
Bellows expansion joints compensate changes in the length of a pipeline section caused by thermal expansion or incorrect installation. The bellows is a corrugated high-strength stainless-steel tube with multi-ply walls for maximum flexibility. The protective casing shields the bellows from external influences and mechanical damage.
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The joint is selected from the pipe linear-expansion calculation; only one joint is fitted between two fixed supports.
Products can also be manufactured to the customer's drawings and technical requirements, including larger diameters.
| DN | 80–1600mm |
|---|---|
| Axial movement 2λ | 80–170mm |
| Axial stiffness | 409–2500N/mm |
| Effective area | 0.0075–2.2114m² |
| Weight | 12–1360kg |
| Bellows material | Stainless steel |
The joint is selected from the pipe linear-expansion calculation; only one joint is fitted between two fixed supports.
Send us the diameter, operating conditions and timeline — we will reply with an engineering review and an indicative price.
Data from the 2025 factory catalogue. All dimensions in mm. Products can be manufactured to the customer's drawings and technical requirements, including larger diameters, based on the specific operating conditions.
| Designation | DN, mm | D — outer diameter, mm | L, mm | d — pipe end diameter, mm | Axial movement 2λ, mm | Axial stiffness, N/mm | Effective area, m² | Weight, kg |
|---|---|---|---|---|---|---|---|---|
| СКСТ 80-2,5-150/О±40/ПП | 80 | 159 | 350 | 89 | 80 | 409 | 0.0075 | 12 |
| СКСТ 100-2,5-150/О±55/ПП | 100 | 174 | 400 | 108 | 110 | 447 | 0.0123 | 19 |
| СКСТ 125-2,5-150/О±55/ПП | 125 | 193 | 450 | 133 | 110 | 490 | 0.0174 | 20 |
| СКСТ 150-2,5-150/О±55/ПП | 150 | 226 | 550 | 159 | 110 | 765 | 0.0239 | 31 |
| СКСТ 200-2,5-150/О±70/ПП | 200 | 292 | 550 | 219 | 140 | 765 | 0.0441 | 50 |
| СКСТ 250-2,5-150/О±70/ПП | 250 | 351 | 550 | 273 | 140 | 908 | 0.0671 | 74 |
| СКСТ 300-2,5-150/О±70/ПП | 300 | 414 | 550 | 325 | 140 | 1089 | 0.0967 | 100 |
| СКСТ 350-2,5-150/О±70/ПП | 350 | 454 | 550 | 377 | 140 | 1200 | 0.1408 | 117 |
| СКСТ 400-2,5-150/О±70/ПП | 400 | 524 | 550 | 428 | 140 | 1567 | 0.1634 | 134 |
| СКСТ 500-2,5-150/О±85/ПП | 500 | 640 | 600 | 530 | 170 | 1110 | 0.2560 | 218 |
| СКСТ 600-2,5-150/О±85/ПП | 600 | 760 | 600 | 630 | 170 | 1520 | 0.3562 | 245 |
| СКСТ 700-2,5-150/О±85/ПП | 700 | 936 | 650 | 720 | 170 | 1090 | 0.5095 | 331 |
| СКСТ 800-2,5-150/О±85/ПП | 800 | 955 | 650 | 820 | 170 | 2500 | 0.6123 | 346 |
| СКСТ 900-2,5-150/О±85/ПП | 900 | 1120 | 760 | 920 | 170 | 1870 | 0.7775 | 470 |
| СКСТ 1000-2,5-150/О±85/ПП | 1000 | 1180 | 760 | 1020 | 170 | 1974 | 0.9126 | 532 |
| СКСТ 1200-2,5-150/О±85/ПП | 1200 | 1390 | 800 | 1220 | 170 | 2100 | 1.2827 | 850 |
| СКСТ 1400-2,5-150/О±85/ПП | 1400 | 1590 | 800 | 1420 | 170 | 2200 | 1.7156 | 1100 |
| СКСТ 1600-2,5-150/О±85/ПП | 1600 | 1790 | 800 | 1620 | 170 | 2330 | 2.2114 | 1360 |
The stuffing-box expansion joint is the most reliable, time-tested engineering device for absorbing the thermal expansion and contraction of metal (thermal deformation) on high-temperature trunk pipelines.
Flanged expansion joint with a corrugated stainless-steel bellows.
Single-sphere rubber expansion joint with galvanised flanges.
