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Flexline Metal Expansion Joints

Single

  • Motion: Axial, lateral offset (limited) and angular rotation
  • Simplest and least expensive expansion joint. Lack of built-in control devices calls for strict control of adjacent piping. Lateral or angular motion applications may require tie rods to contain pressure thrust.
Single

Universal

  • Motion: Lateral offset (large) in any direction
  • Least expensive for application. As with the single expansion joint, lack of control devices demands careful anchoring and guidance of connected piping. Suitable for low pressure applications only.
Universal

Universal Tied

  • Motion: Lateral offset (large) in any direction
  • Like the simple (non-tied) Universal expansion joint, the Tied Universal accommodates large lateral offset by virtue of small angular rotations. Tie rods are used to limit center spool motion and contain pressure thrust. This configuration can be used in systems which cannot provide optimum anchoring and guiding.
Universal Tied

Pressured Balanced Elbow

  • Motion: Axial (plus limited lateral and angular)
  • Eliminates pressure thrust and requirement for main anchors. Minimizes guiding requirement. Frequently used at point of connection to equipment which is sensitive to nozzle loading.
Pressured Balanced Elbow

Hinged

  • Motion: Angular rotation (single plane)
  • Maximizes bellows life by closely controlling movement and preventing torsion damage. Hinge structure contains pressure thrust, transmits extraneous loads and supports dead weight. Use of two or three hinged expansion joints separated by pipe spools in a system containing a go to turn can accommodate large pipe excursions in a single plane.
Hinged

Gimbal

  • Motion: Angular rotation (all planes)
  • Like the Hinged expansion joint, the Gimbal expansion joint closely controls bellows movement and prevents torsion damage. Gimbal structure contains pressure thrust, transmits extraneous loads, and supports dead weight.
Gimbal

External Pressured

  • Motion: Axial (long) only
  • Design incorporates alignment guide, internal liner and external cover. Convolutions are self draining, minimizing entrapment of sediment or corrosive residues. Fully-enclosed bellows minimizes danger in the event of bellows failure.
External Pressured

Rectangular

  • Motion: Axial, lateral offset (limited) and angular rotation
  • Typically used in low pressure ducting. Rectangular shape with deep convolutions provides low spring rates but limits pressure capacity. Available in single or universal configurations, these expansion joints may be fitted with control devices such as rods or hinges to fit individual applications.
Rectangular

Temperature Correction Factors

Temp (°F) 304, 316L Stainless 321 Stainless Bronze Monel Hastelloy Inconel
Room 1.00 1.00 1.00 1.001.00 1.00
150 0.96 0.97 0.92 0.930.97 0.99
200 0.92 0.94 0.89 0.900.94 0.98
250 0.91 0.92 0.86 0.870.92 0.97
300 0.86 0.88 0.83 0.830.91 0.97
350 0.85 0.86 0.81 0.820.89 0.96
400 0.82 0.83 0.78 0.790.87 0.95
450 0.80 0.81 0.75 0.770.86 0.94
500 0.77 0.78 --- 0.730.85 0.94
600 0.73 0.74 --- 0.720.84 0.92
700 0.69 0.70 --- 0.710.82 0.90
800 0.64 0.66 --- 0.700.81 0.89
900 --- 0.62 --- ---0.79 0.87
1000 --- 0.60 --- ---0.78 0.86
1100 --- 0.58 --- ---0.75 0.84
1200 --- 0.55 --- ---0.73 0.82
1300 --- 0.50 --- ---0.69 0.079
1400 --- 0.44 --- ---0.65 0.77
1500 --- 0.40 --- ------ 0.74

Saturated Steam Pressure To Temperature (HG)

Saturated Steam Vacuum (in. of Hg) Temp (°F)
--- 0
29.84 20
29.74 32
29.67 40
29.39 60
28.89 80
27.99 100
26.48 120
24.04 140
20.27 160
15.20 180
6.46 200

Saturated Steam Pressure To Temperature (PSIG)

Saturated Steam (PSIG) Temp (°F)
0 212
10 238
20 259
30 274
40 287
50 298
60 307
70 320
80 324
90 331
100 338
125 353
150 366
170 377
200 388
225 397
250 406
275 414
300 422
325 429
350 436
375 442
400 448
425 454
450 460
475 465
500 470
550 480
600 489
700 505
800 520
900 534
1000 546
1250 574
1500 606
2500 669