Flanged Expansion Joints and Bellows Assemblies

Flanged expansion joints

A flanged expansion joint must be selected for the actual piping system, not by nominal diameter alone. The quotation request should identify DN or NPS, flange standard and class, design pressure and temperature, axial, lateral or angular movement, cycle requirement and the conveyed medium.

Bellows and flange configuration

State the bellows, flange and liner materials, number of plies, overall length, tie-rod or restraint requirement and whether fixed or rotating flanges are needed. Include a drawing or flange drilling details when the assembly must match existing equipment. Values in the legacy size tables below require confirmation for the exact design.

Standard axial expansion joints with rotating and fixed flangeStandard axial expansion joints with rotating and fixed flangeStandard axial expansion joints with rotating and fixed flange

Reference data

Nominal diameter DN, mm Nominal diameter DN, mm 30 mm ±(15) 45 mm ±(22.5) 60 mm ±(30) D, mm d, mm k, mm b, mm n, mm o, mm Impact area cm2 Nominal pressure PN, bar
25 1″ 110 - - 115 43 85 18 4 14 18 16
32 1 ¼″ 110 - - 140 43 100 18 4 18 18 16
40 1 ½″ 120 150 - 150 49 110 18 4 18 22 16
50 2″ 120 150 - 165 61 125 18 4 18 36 16
65 2 ½″ 120 150 180 185 77 145 18 4 18 58 16
80 3″ 120 150 180 200 89 160 20 8 18 78 16
100 4″ 120 150 185 220 115 180 20 8 18 124 16
125 5″ 125 155 190 250 140 210 22 8 18 180 16
150 6″ 130 155 200 285 169 240 22 8 22 252 16
200 8″ 150 190 230 340 220 295 24 12 22 430 16
250 10″ 165 205 245 405 274 355 26 12 26 660 16
300 12″ 165 205 245 445 324 400 26 12 22 910 10
350 14″ 170 215 255 505 356 460 26 16 22 1060 10
400 16″ 170 210 255 565 407 515 26 16 26 1420 10
450 18″ 185 230 270 615 458 565 28 20 26 1750 10
500 20″ 195 235 285 670 509 620 28 20 26 2180 10
600 24″ 170 215 240 755 611 705 24 20 26 3110 6
700 28″ 190 245 270 860 712 810 24 24 26 4250 6
800 32″ 170 200 230 975 815 920 24 24 30 5510 6
900 36″ 190 225 255 1075 916 1020 26 24 30 6900 6
1000 40″ 165 205 205 1175 1018 1120 26 28 30 8580 6
Nominal diameter DN, mm Nominal diameter DN, mm 30 mm ±(15) 45 mm ±(22.5) 60 mm ±(30) D, mm d, mm k, mm b, mm n, mm o, mm Nominal pressure PN, bar
25 1″ 110 - 115 38 85 16 4 14 16 16
32 1 ¼″ 115 - 140 42.4 100 16 4 18 18 16
40 1 ½″ 120 - 150 48.3 110 16 4 18 23 16
50 2″ 110 - 165 60.3 125 18 4 18 37 16
65 2 ½″ 110 195 185 76.1 145 18 4 18 58 16
80 3″ 110 190 200 88.9 160 20 8 18 79 16
100 4″ 115 200 220 114.3 180 20 8 18 128 16
125 5″ 120 210 250 139.7 210 22 8 18 183 16
150 6″ 140 225 285 168.3 240 22 8 22 268 16
200 8″ 140 245 340 219.1 295 24 12 22 437 16
250 10″ 140 235 405 273 355 26 12 26 705 16
300 12″ 140 235 460 323.9 410 28 12 22 984 16

Engineering information for quotation

Expansion joints can be safety-critical piping components. Evek LLC can review a sourcing request, but final selection, anchors, guides, pressure thrust, movement capacity, fatigue life and code compliance remain subject to engineering review and purchaser approval. Availability and manufacturing route are confirmed during quotation.

Information required for a quote

Send DN or NPS, flange standard and class, pressure, temperature, medium, movement in each direction, cycle count, materials, overall length, quantity, drawing and U.S. delivery ZIP code.

Evek LLC reviews every requirement against the requested grade, specification, form, dimensions and quantity. Stock, production route, origin, minimum quantity, certification, price and compliance are confirmed during quotation; website text is not a stock or suitability guarantee.

Related products and contact

Request a U.S. quote

Evek LLC serves customers throughout the United States. Typical delivery is 2–3 weeks, subject to the material, specification, dimensions, quantity, production route and availability.

Send the complete requirement to Evek LLC and include the U.S. delivery ZIP code.