Direct Buried Expansion Joint
Directly buried expansion joint is a kind of compensation device used for directly buried pipeline, mainly used to absorb the axial displacement of pipeline caused by thermal expansion and contraction, with the characteristics of bending resistance and soil pressure resistance.
Overview
Directly buried expansion joint is a kind of compensation device used for directly buried pipeline, mainly used to absorb the axial displacement of pipeline caused by thermal expansion and contraction, with the characteristics of bending resistance and soil pressure resistance. Its structure usually includes bellows, connecting ring and end pipe, etc. The main structure consists of one or more bellows connected in series to compensate the displacement of pipeline through the expansion and contraction of bellows. It is protected by an outer sleeve to ensure the stability of the axial movement of the bellows. This structure enables the expansion joint to play an effective compensating role in the pipeline system, and at the same time has a certain bending resistance.
The main advantages of directly buried expansion joints include the following aspects:
Simple structure, easy installation and maintenance: Directly buried expansion joints are usually composed of bellows and outer sleeve, with simple structure, no need for complex guiding bracket, relatively easy installation and maintenance. In addition, no maintenance is required after installation, which can speed up the project progress and reduce the project cost.
Large compensation capacity and long service life: directly buried expansion joints have large axial compensation capacity and can adapt to large pipeline expansion and contraction changes. Due to its structural design and material selection, it usually has a long service life.
Strong bending resistance: Directly buried expansion joints have good bending resistance, which can resist the influence of pipe sinking and reduce the stress concentration problem caused by pipe bending.
Strong corrosion resistance: Directly buried expansion joints are usually made of stainless steel, which has good corrosion resistance and can work stably in harsh environments for a long time.
Wide range of application: Directly buried expansion joints are suitable for axial compensation of various directly buried pipelines and are widely used in the construction of heat network pipelines.
Design temperature:-20℃-+400℃ | ||||||||||
Path DN | Wavenumber | Pressure ratingMPa | Bellows Effective area cm2 | Maximum oute diameter Size mm | Take over port size mm | Length L(mm) | ||||
0.25 | 0.6 | 1.0 | 1.6 | 2.5 | ||||||
Axial compensation mm/Stiffness N/mm | ||||||||||
50 | 8 | 14/153 | 12/318 | 12/318 | 12/635 | 11/1310 | 37 | 120 | ф57x3.5 | 361 |
16 | 27/76 | 24/158 | 24/158 | 24/318 | 23/655 | 445 | ||||
32 | 52/38 | 48/79 | 48/79 | 48/159 | 46/328 | 621 | ||||
65 | 8 | 19/213 | 18/213 | 18/213 | 18/424 | 15/841 | 55 | 159 | ф73x4 | 377 |
12 | 30/142 | 29/142 | 27/142 | 27/283 | 25/421 | 425 | ||||
24 | 60/71 | 58/107 | 54/107 | 54/142 | 50/211 | 581 | ||||
80 | 8 | 30/179 | 30/179 | 30/358 | 29/358 | 27/650 | 81 | 162 | ф89x4 | 430 |
10 | 54/143 | 37/143 | 371286 | 37/286 | 32/325 | 466 | ||||
20 | 108/72 | 74/72 | 74/143 | 74/143 | 64/163 | 660 | ||||
100 | 6 | 34/138 | 34/277 | 33/417 | 33/417 | 32/817 | 121 | 180 | ф108x4 | 410 |
10 | 56/83 | 56/166 | 56/250 | 54/417 | 50/409 | 492 | ||||
20 | 112/42 | 112/83 | 112/125 | 108/125 | 100/205 | 712 | ||||
125 | 5 | 37/136 | 36/272 | 36/408 | 35/408 | 33/801 | 180 | 221 | ф133x4 | 410 |
9 | 66/76 | 65/151 | 65/227 | 63/227 | 60/401 | 412 | ||||
18 | 132/38 | 130/76 | 130/114 | 126/114 | 120/201 | 711 | ||||
150 | 5 | 49/100 | 49/200 | 48/300 | 45/456 | 44/845 | 257 | 245 | ф159x4.5 | 433 |
8 | 88/63 | 78/125 | 77/188 | 71/286 | 65/423 | 518 | ||||
16 | 159/32 | 156/63 | 154/94 | 142/143 | 130/211 | 756 | ||||
200 | 4 | 58/95 | 56/193 | 56/288 | 56/480 | 55/800 | 479 | 327 | ф219x6 | 475 |
6 | 86/63 | 85/128 | 85/192 | 84/320 | 80/927 | 553 | ||||
12 | 172/32 | 170/64 | 170/96 | 168/160 | 160/200 | 800 | ||||
250 | 4 | 75/170 | 74/343 | 63/588 | 53/930 | 50/1856 | 769 | 404 | ф273x8 | 500 |
6 | 112/113 | 110/228 | 95/392 | 80/620 | 78/927 | 620 | ||||
12 | 220/57 | 220/114 | 190/196 | 160/310 | 156/464 | 984 | ||||
300 | 4 | 73/250 | 72/503 | 65/830 | 57/1253 | 54/2142 | 1105 | 451 | ф325x8 | 584 |
6 | 110/167 | 109/335 | 97/553 | 85/835 | 80/1071 | 713 | ||||
12 | 220/84 | 218/168 | 194/277 | 170/418 | 160/536 | 1116 | ||||
350 | 4 | 79/263 | 78/523 | 72/840 | 64/1265 | 62/2684 | 1307 | 500 | ф377x10 | 614 |
6 | 119/175 | 117/348 | 107/560 | 97/843 | 90/1342 | 759 | ||||
12 | 238/88 | 234/174 | 214/280 | 194/442 | 180/671 | 1216 | ||||
400 | 4 | 83/280 | 73/458 | 70/918 | 65/1373 | 63/3675 | 1611 | 537 | ф426x10 | 625 |
6 | 125/187 | 109/305 | 102/612 | 97/915 | 90/1838 | 771 | ||||
12 | 250/94 | 218/153 | 204/306 | 194/458 | 180/920 | 1225 | ||||
450 | 4 | 98/203 | 96/405 | 82/690 | 69/2305 | 65/4350 | 1972 | 632 | ф478x10 | 620 |
6 | 147/135 | 144/270 | 124/460 | 103/1537 | 90/2175 | 762 | ||||
12 | 294/68 | 288/135 | 248/230 | 206/769 | 180/1087 | 1200 | ||||
500 | 4 | 102/212 | 100/423 | 84/728 | 70/2452 | 63/4256 | 2445 | 699 | ф529x10 | 624 |
6 | 153/142 | 149/282 | 126/485 | 105/1635 | 90/2128 | 766 | ||||
12 | 306/71 | 298/141 | 252/243 | 210/818 | 180/1064 | 1216 | ||||
600 | 4 | 123/265 | 121/530 | 86/1468 | 99/1740 | 95/2842 | 3534 | 806 | ф630x10 | 676 |
6 | 185/177 | 181/353 | 148/978 | 140/1160 | 120/1420 | 848 | ||||
12 | 370/89 | 362/177 | 358/489 | 280/580 | 240/710 | 1382 | ||||
700 | 4 | 128/287 | 126/573 | 87/1625 | 85/2972 | 84/4100 | 4717 | 915 | ф720x10 | 708 |
6 | 192/192 | 188/382 | 168/1083 | 131/1982 | 120/2050 | 882 | ||||
12 | 384/96 | 376/191 | 336/542 | 262/991 | 240/11025 | 1422 | ||||
800 | 4 | 128/310 | 126/620 | 84/1778 | 85/3183 | 84/6234 | 5822 | 1005 | ф820x10 | 724 |
8 | 256/155 | 252/310 | 168/889 | 170/1591 | 168/3117 | 1071 | ||||
12 | 384/103 | 378/207 | 252/596 | 241/1061 | 236/1558 | 1538 | ||||
900 | 4 | 151/378 | 149/758 | 118/1329 | 117/2575 | 7620 | 1137 | ф920x10 | 792 | |
8 | 302/189 | 298/379 | 236/664 | 234/1288 | 1211 | |||||
12 | 453/126 | 447/253 | 351/443 | 354/825 | 1650 | |||||
1000 | 4 | 140/423 | 140/845 | 115/2270 | 90/5038 | 9043 | 1227 | ф1020x10 | 800 | |
8 | 280/212 | 280/423 | 230/1385 | 180/2519 | 1200 | |||||
12 | 420/141 | 420/282 | 345/923 | 170/1679 | 1616 | |||||
