Flanged Exhaust Expansion Joint

Flanged metal bellows expansion joints connect to pipes or equipment through flanges and are mainly used to accommodate thermal movement caused by temperature changes. Compared with weld-end bellows, flanged connections are easier to install, remove, and maintain, and can be customized according to piping pressure ratings, flange standards, bolt patterns, and equipment interfaces.

Yueding is equipped with product design, CNC machining, and stamping capabilities. Round, square, and custom-shaped flange connections can be produced according to DIN, ASME, JIS, EN, and GB standards or customer drawings. OEM and ODM production is available, and suitable product solutions can be confirmed based on nominal diameter, design pressure, operating temperature, media, required movement, and installation dimensions.

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Product Description

Product Description

Specifications	Diameter (DN)	Axial Compensation (mm)	Axial Stiffness (N/mm)	Maximum Radial Size (mm)	Interface Dimension (D × d, mm)	Product Length L (mm)	Pressure Range (MPa)
TB100 × □-□	DN100	13–54	1323–115	238	Ø108 × 4	280–380	0.25–2.5
TB150 × □-□	DN150	15–67	1910–158	289	Ø159 × 4.5	280–380	0.25–2.5
TB200 × □-□	DN200	30–101	1493–106	389	Ø219 × 6	380–520	0.25–2.5
TB250 × □-□	DN250	30–124	1850–126	443	Ø273 × 8	380–520	0.25–2.5
TB300 × □-□	DN300	34–111	2945–110	495	Ø325 × 8	400–600	0.25–2.5
TB350 × □-□	DN350	33–117	3229–119	577	Ø377 × 8	400–600	0.25–2.5
TB400 × □-□	DN400	36–122	3690–131	626	Ø426 × 8	400–600	0.25–2.5
TB450 × □-□	DN450	38–125	4145–145	678	Ø478 × 8	400–600	0.25–2.5
TB500 × □-□	DN500	31–125	4600–160	729	Ø529 × 8	400–600	0.25–2.5
TB600 × □-□	DN600	53–156	2908–135	830	Ø630 × 10	560–850	0.25–2.5
TB700 × □-□	DN700	50–158	2656–145	980	Ø720 × 10	560–850	0.25–2.5
TB800 × □-□	DN800	50–159	2924–155	1080	Ø820 × 10	560–850	0.25–2.5
TB900 × □-□	DN900	50–164	3205–167	1180	Ø920 × 10	560–850	0.25–2.5
TB1000 × □-□	DN1000	50–163	4104–184	1280	Ø1020 × 10	560–850	0.25–2.5
TB1100 × □-□	DN1100	32–116	4473–263	1380	Ø1120 × 10	680–800	0.25–1.6
TB1200 × □-□	DN1200	32–116	4843–283	1480	Ø1220 × 14	680–800	0.25–1.6
TB1300 × □-□	DN1300	31–113	5215–303	1580	Ø1320 × 14	680–800	0.25–1.6
TB1400 × □-□	DN1400	31–111	5587–323	1680	Ø1420 × 14	680–800	0.25–1.6
TB1500 × □-□	DN1500	31–116	5961–343	1780	Ø1520 × 14	680–800	0.25–1.6
TB1600 × □-□	DN1600	33–113	6242–363	1880	Ø1620 × 14	680–800	0.25–1.0
TB1700 × □-□	DN1700	33–107	6611–383	1980	Ø1720 × 14	700–820	0.25–1.0
TB1800 × □-□	DN1800	33–106	6981–403	2080	Ø1820 × 14	700–820	0.25–1.0
TB1900 × □-□	DN1900	33–106	7351–423	2180	Ø1920 × 14	700–820	0.25–1.0
TB2000 × □-□	DN2000	36–88	5721–708	2360	Ø2020 × 14	725–800	0.25–1.0

Note: The above parameters are for reference only. The stated fatigue life is 1,000 cycles. Other specifications can be designed and calculated separately. The primary displacement direction is axial, with a limited amount of lateral and angular displacement.

Reduce the Impact of Thermal Movement

Stainless steel bellows flex to provide room for piping movement caused by temperature changes, helping reduce stress transferred to flange connections, equipment interfaces, and pipe supports. Axial, lateral, or angular configurations can be selected according to your piping layout, allowing the expansion joint to move in the same direction as the main thermal displacement and reducing connection risks caused by repeated expansion and contraction during long-term operation.

Easier Installation and Maintenance

Flanged ends connect directly to matching pipes or equipment interfaces. Compared with weld-end designs, inspection, maintenance, or replacement can usually be completed without cutting the existing pipeline, helping shorten on-site work and reduce disruption to the overall system. Once flange standard, pressure rating, bolt pattern, and sealing face are matched to your existing interface, dimensional consistency is also easier to maintain during new installation or future replacement.

Balance Movement Capacity and Operating Stability

Single- or multi-ply bellows can be selected according to pressure, temperature, media, required movement, and operating cycles. Under similar total wall thickness and convolution geometry, multi-ply bellows generally have lower stiffness, allowing easier elastic deformation and helping reduce working stress. This makes them suitable for applications involving larger movement or repeated displacement.

Internal liners, external protective covers, tie rods, or limit rods can also be added where required. These components may help improve internal flow conditions, protect the bellows, or control the movement range, allowing the expansion joint to match the actual installation rather than using one fixed configuration for every piping system.

Product Questions & Answers

Why must bolt-hole orientation be confirmed before installing fixed flanges?

Once fixed flanges are welded to the connecting pipes, their bolt-hole orientation usually cannot be rotated. If the hole positions at both ends do not align with the existing pipeline or equipment interfaces, installation may become difficult.

For square flanges, custom-shaped flanges, or projects with specific hole-orientation requirements, the bolt pattern and orientation should be clearly shown on the drawing before production. Where greater on-site alignment flexibility is needed, floating flanges or other suitable connection structures can be evaluated.

Which materials and surface treatments are available for the flanges?