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Maintenance
Maintenance free P.T.F.E. dry bearings with stainless steel shafts are used on all
pivoting points and are totally enclosed. (See Maintenance Instructions).
Information Required when Ordering
Preset PositionNo. Required Mounting Type Actual Travel
Fig. No. (eg C50) Operating Load Total TravelSupport Size Hydro Test Load Travel Direction (Up/Down)
Drop Rod Size and Thread form if not standard (standard metric coarse).Finish if not Standard.
Finish
All units are painted; other corrosion-resistant finishes are available if required at
extra cost.
Using Kn Selection Table
Locate Total Travel Column of 120 mm, and follow down column for next load upfrom 10 Kn. This reads 10.405 Kn.
Next, move horizontally to the left under column headed Constant Support Size.
In this example the selected unit would be size 22.
Selection
To select a Constant Support, first calculate the load and travel which the support
is to accommodate. (Inclusive of pipeweight, insulation, contents and ancillaryequipment). It is then good practice to add overtravel to calculated travel.
Recommended overtravel: Add 25 mm for travels up to 125 mmFor travels in excess of 125 mm add 20 per cent
of the calculated travel.
This should then be rounded up to the next whole 10 mm increment giving the totaltravel, thus enabling a standard support to be selected.
To determine the correct constant support refer to the selection table and select a
support size to accommodate the calculated load and the total travel. It should benoted that the travel given in the table is the total travel, this being the maximumvertical travel the unit will accommodate.
When selecting vertical constants (Fig C51 only) these should always be selectedfrom the right hand side of the heavy line.
Example
Actual Load 10 Kn
Actual Movement (Vertical) 90 mmTotal Travel = 90 + 25, rounded up to the next whole 10 mm increment
= 120 mm
Note: For Base Mounted Constants C54 and C55 the maximum allowable lateralload is limited to 15% of the vertical load.
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Constant Effort Supports - Types Available
C50 C51 C52 C53
C54 C55 C56
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NOTE: See Selection tables on pages 8 & 9 for constant spring sizes 34 to 66
LOADS IN Kg
Constant
Support
Size
TOTAL TRAVEL IN mm
330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 530 540 550 560 570 580 590 600 610
Min Load
1
2
3
4
56
7 40 39 38 37 36 35 34 33 32 32
8 51 50 48 47 46 44 43 42 41 40
9 65 63 61 60 58 57 55 54 52 51
10 82 80 78 76 74 72 70 68 66 65
11 105 102 99 96 94 91 89 87 84 82
12 133 129 125 122 119 116 113 110 107 105
13 150 145 141 137 134 130 127 124 121 118
14 169 163 159 154 150 146 143 139 136 132
15 189 184 178 173 169 164 160 156 152 149
16 209 203 197 192 187 182 177 173 169 165
17 231 224 218 212 206 201 196 191 186 182
18 262 255 247 241 234 228 222 217 211 206
19 298 289 281 273 266 259 252 246 240 234 229 224 219 214 209 205 201 197
20 325 315 306 298 289 282 275 268 261 255 249 243 238 233 228 223 219 214
21 353 343 333 324 315 307 299 292 284 278 271 265 259 253 248 243 238 233
22 386 374 364 354 344 335 326 318 310 303 296 289 283 277 271 265 260 25523 421 408 397 386 375 366 356 347 339 331 323 316 309 302 296 289 283 278
24 457 444 431 419 408 397 387 378 368 360 351 343 336 328 321 315 308 302
25 503 488 474 461 448 437 425 415 405 395 386 377 369 361 353 346 339 332
26 555 539 523 509 495 482 470 458 447 436 426 416 407 398 390 382 374 366
27 632 613 596 579 564 549 535 521 509 496 485 474 463 453 444 434 426 417
28 716 695 675 656 638 622 606 591 576 562 549 537 525 514 503 492 482 472
29 782 759 737 717 698 679 662 645 630 615 600 587 574 561 549 538 527 516
30 852 827 803 781 760 740 721 703 686 669 654 639 625 611 598 586 574 562
31 929 901 876 851 828 807 786 766 748 730 713 697 681 666 652 639 626 613
32 1012 983 955 928 903 879 857 835 815 795 777 759 742 726 711 696 682 668
33 1159 1125 1093 1063 1034 1007 981 956 933 911 890 869 850 832 814 797 781 765
Constant Effort Support Selection TableStandard Travel Range ( )Spring Sizes 1 to 33Total Travels 330 to 610mm
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NOTE: See Selection tables on pages 12 & 13 for constant spring sizes 34 to 66
Standard Travel Range ( )Total Travels 330 to 610mm
Constant Effort Support Selection TableSpring Sizes 1 to 33
LOADS IN Kn
Constant
Support
Size
TOTAL TRAVEL IN mm
330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 530 540 550 560 570 580 590 600 610
Min Load
1
2
3
4
5
6
7 0,392 0,383 0,373 0,363 0,353 0,343 0,333 0,324 0,314 0,314
8 0,500 0,491 0,471 0,461 0,451 0,431 0,422 0,412 0,402 0,392
9 0,638 0,618 0,598 0,589 0,569 0,559 0,540 0,530 0,510 0,500
10 0,804 0,785 0,765 0,746 0,726 0,706 0,686 0,667 0,647 0,637
11 1,030 1,006 0,971 0,942 0,922 0,892 0,873 0,854 0,824 0,804
12 1,305 1,265 1,226 1,197 1,167 1,138 1,108 1,079 1,049 1,030
13 1,470 1,421 1,382 1,343 1,315 1,275 1,246 1,216 1,187 1,158
14 1,657 1,598 1,559 1,510 1,471 1,432 1,403 1,364 1,334 1,295
15 1,853 1,804 1,745 1,696 1,658 1,609 1,570 1,530 1,491 1,462
16 2,049 1,990 1,931 1,882 1,834 1,785 1,736 1,697 1,658 1,619
17 2,265 2,196 2,137 2,078 2,021 1,972 1,923 1,874 1,825 1,785
18 2,568 2,450 2,421 2,363 2,296 2,237 2,178 2,129 2,070 2,021
19 2,922 2,834 2,756 2,677 2,608 2,540 2,471 2,412 2,353 2,295 2,246 2,197 2,147 2,098 2,049 2,010 1,971 1,932
20 3,187 3,089 3,001 2,922 2,834 2,765 2,697 2,628 2,560 2,500 2,442 2,383 2,334 2,285 2,236 2,187 2,147 2,098
21 3,462 3,364 3,266 3,177 3,089 3,010 2,932 2,863 2,785 2,726 2,657 2,599 2,540 2,481 2,432 2,383 2,334 2,285
22 3,785 3,668 3,570 3,472 3,373 3,285 3,197 3,119 3,040 2,971 2,903 2,834 2,775 2,716 2,657 2,598 2,550 2,500
23 4,129 4,001 3,893 3,785 3,677 3,589 3,491 3,403 3,324 3,246 3,167 3,099 3,030 2,961 2,903 2,834 2,775 2,726
24 4,482 4,354 4,227 4,109 4,001 3,893 3,795 3,707 3,609 3,530 3,442 3,363 3,295 3,216 3,148 3,089 3,020 2,961
25 4,933 4,786 4,648 4,521 4,393 4,285 4,167 4,069 3,971 3,873 3,785 3,697 3,618 3,540 3,461 3,393 3,324 3,256
26 5,443 5,286 5,129 4,992 4,854 4,726 4,609 4,491 4,383 4,275 4,177 4,079 3,991 3,903 3,824 3,746 3,667 3,589
27 6,198 6,011 5,845 5,678 5,531 5,383 5,246 5,109 4,991 4,864 4,756 4,648 4,540 4,442 4,354 4,256 4,177 4,089
28 7,022 6,816 6,619 6,433 6,256 6,099 5,942 5,795 5,648 5,511 5,383 5,266 5,148 5,040 4,932 4,825 4,726 4,628
29 7,669 7,443 7,228 7,031 6,844 6,658 6,491 6,325 6,178 6,031 5,884 5,756 5,629 5,501 5,383 5,276 5,168 5,060
30 8,355 8,110 7,875 7,659 7,452 7,256 7,070 6,894 6,727 6,560 6,413 6,266 6,129 5,991 5,864 5,746 5,629 5,511
31 9,110 8,836 8,591 8,345 8,119 7,913 7,707 7,511 7,335 7,158 6,992 6,835 6,678 6,531 6,393 6,266 6,138 6,011
32 9,924 9,640 9,365 9,101 8,855 8,619 8,404 8,188 7,992 7,796 7,619 7,443 7,276 7,119 6,972 6,825 6,688 6,550
33 11,366 11,032 10,719 10,424 10,140 9,875 9,620 9,374 9,149 8,933 8,727 8,521 8,335 8,158 7,982 7,815 7,658 7,501
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Installation Instructions
1.0 Attachment to Supporting SteelworkThe Constant Support Units are attached to the supporting steelwork
by means of welding or bolting. (See data sheets for details.)
2.0 Connecting and Loading of Constant Support Units
2.1 In the case of Constant Support Units Fig Nos C50-C51-C52-C53utilising sling rods, these should be connected between the
equipment support attachment and the support unit connector
(turnbuckle or yoke). The load is transferred from the temporaryinstallation condition to the Constant Support Unit by the adjustmentof the turnbuckle or yoke arrangement.The correct load setting is attained by adjusting the turnbuckle or yoke
arrangement until the preset pin is easily removed.
2.2 In the case of Constant Support Units Fig Nos C54 and C55
where the equipment is supported from below, the Constant SupportUnit is positioned between the equipment support bracket andsupporting steelwork, differences in height are accommodated using
the height adjustment nut. The load is transferred from the temporaryinstallation condition to the Constant Support Unit by furtheradjustment of the height adjustment nut.
The correct load setting is attained by rotation of the heightadjustment nut until the preset pin is easily removed.
3.0 Pre-Commissioning
3.1 The red painted preset pins should normally remain in position for any
pre-commissioning overload conditions, but must be removed prior tooperation and stored for future use.
4.0 Load Adjustment4.1 In the event that the load is greater or lesser than the load for which
the unit is calibrated, it will be necessary to make use of the loadadjustment facility.
The load adjuster allows for an increase or decrease of loadcarrying capacity of plus or minus 20 per cent of the mean load.Rotating the load adjuster nut in the appropriate direction will
increase or decrease the load accordingly. The load adjustmentscale is calibrated in 2 per cent divisions.
5.0 Operating
5.1 Prior to start-up the following checks must be carried out.
5.1.1 All preset pins are removed and stored.5.1.2 The unit travel indicator is set at the correct cold setting.
5.2 During normal running operation a check should be made to ensurethat the unit travel indicator is at the correct hot position.
5.3 A periodic check during the first few months of operation should bemade to ensure that euipment movement is within the travel range of
the unit. Minor site adjustments may be necessary during this period.
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Constant Effort Supports C50
Rod take
out calculated
when load arm is
in high position.
For up travel, rod
take out equals
total up travel
plusB, B1 or B2
* ACCESS TO LOAD ADJUSTER
TYPE J TYPE P
TYPE KTYPE M
TYPE LTYPE O
NOT RECOMMENDED OVER 150TRAVEL OR SIZE 33
U1
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Constant Effort Supports C51
NOTE:
Type R not recommended over 150mmTravel or Size 33.
NOTE:
Type S & T
Not recommended over:
190 Travel Sizes 1 to 12
210 Travel Sizes 13 to 18
290 Travel Sizes 19 to 26
300 Travel Sizes 27 to 33
500 Travel Sizes 34 to 39 or for all Travels, Sizes 40 to 66
* ACCESS TO LOAD ADJUSTER
TYPE V TYPE R
TYPICAL YOKE
ARRANGEMENT(USED ON SPRING SIZES
48 TO 66 ALL TYPES)
0
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Constant Effort Supports C51
* ACCESS TO LOAD
ADJUSTER
TYPE TTYPE U
TYPE X TYPE Z
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TYPE S TYPE W
* ACCESS TO LOAD ADJUSTER
Constant Effort Supports C51
ROD TAKE OUT CALCULATED
WHEN LOAD ARM IS IN HIGH
POSITION. FOR UP TRAVEL, ROD
TAKE OUT EQUALS TOTAL UP
TRAVEL PLUS B, B1 OR B3.
E
0
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Constant Effort Supports C51
* ACCESS TO LOAD ADJUSTER
TYPE Y
GG
CC
CC
HH
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Constant Effort Supports C5228
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Constant Effort Supports C52
* ACCESS TO LOAD ADJUSTER
TYPE Y TYPE Z TYPE X
E
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ROD TAKE OUT = B FOR TYPES Y and Z
B1 OR B2 FOR TYPE X
TYPICAL YOKE ARRANGEMENTALSO APPLIES TO TYPE X
ROD TAKE OUT CALCULATED WHEN
LOAD ARM IN HIGH POSITION.
FOR UP TRAVEL, ROD TAKE OUT EQUALS
TOTAL UP PLUS B, B1 OR TOTAL UPMINUS B2.
ROD TAKE OUT = B FOR TYPES Y and ZB1 OR B2 FOR TYPE X
* ACCESS TO LOAD ADJUSTER
ROD TAKE OUT CALCULATED WHENLOAD ARM IN HIGH POSITION.FOR UP TRAVEL, ROD TAKE OUT EQUALS
TOTAL UP PLUS B, B1 OR TOTAL UPMINUS B2.
TYPICAL YOKE ARRANGEMENTAPPLICABLE TO TYPES X, Y AND ZSEE YOKE TABLE (ON PAGE 30)
FOR UNIT SIZE AND TRAVEL RANGEAPPLICABLE.
NOTE: TYPES Y,Z, and G ARE NOT RECOMMENDED OVER:
250 TRAVEL FOR FRAME SIZE 1 - 6
300 TRAVEL FOR FRAME SIZE 7 - 12
360 TRAVEL FOR FRAME SIZE 13 - 18
420 TRAVEL FOR FRAME SIZE 19 - 26 & 27 - 33
500 TRAVEL FOR FRAME SIZE 34 - 39
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Constant Effort Supports C52
NOTE:
WHEN USING TYPE G THE WORKING
LOAD MUST BE HALVED TO SELECT
HANGER SIZE.
NOTE:
ARMS IN HIGH POSITION ALLOW
DOWNWARD PIPE MOVEMENT
TYPE G
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Constant Effort Supports C53
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Constant Effort Supports C53
ROD LENGTHS ADD B OR SUBTRACT B1.
ROD TAKE OUT CALCULATED WHEN LOAD ARM
IS IN HIGH POSITION.
WHEN USING B FOR UP TRAVEL, ROD TAKE OUT
EQUALS TOTAL UP TRAVEL MINUS B.
WHEN USING B1 FOR UP TRAVEL, ROD TAKE
OUT EQUALS TOTAL UP TRAVEL PLUS B1.* ACCESS TO LOAD ADJUSTER
LONGER TOP RODS CAN BE
SUPPLIED ON REQUEST
+
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Constant Effort Supports C54
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pp
HEIGHT B CALCULATED WHEN LOAD
ARM IS IN HIGH POSITION.
FOR UP TRAVEL, INSTALLED HEIGHT
EQUALS B MINUS UP TRAVEL.
* ACCESS TO LOAD ADJUSTER
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Constant Effort Supports C55
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pp
EXTENDED BASEPLATES
USED FOR TRAVELS OVER
150.
HEIGHT B CALCULATED WHEN LOAD
ARM IS IN HIGH POSITION.
FOR UP TRAVEL, INSTALLED HEIGHT
EQUALS B MINUS UP TRAVEL.
* ACCESS TO LOAD ADJUSTER
SQUARE BASEPLATES USED FOR
TRAVELS UP TO AND INCLUDING 150.
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Travel R S T B B1
51 68 60 105 247 170
64 85 63 108 241 164
77 102 66 112 235 157
Load in Kg
Travel Size 1 2 3 4 5 6 7 8 9 10
5109 15 24 37 56 78 105 151 232 350
14 23 36 54 77 104 150 231 349 499
6407 12 19 30 44 63 84 121 186 280
11 18 29 43 62 83 120 185 279 399
7706 10 16 25 37 52 70 101 155 234
09 15 24 36 51 69 100 154 233 333
Dim L 175 175 175 175 175 175 205 205 205 205
Note:
Rod Take Out Calculated whenLoad Arm is in High Position
For UP travel, Rod Take Outequals B or B1 plus UP travel
Admiralty Approved
Type A
Type B
Type C04/10
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ROLLER
TROLLEYS
ROLLER TROLLEYS
Occassionally it is necessary to support piping having large
longitudinal movements which is located very close to the
supporting structure above. In these or similar circumstances,
a large angular movement is imparted to the sling rod andassociated spring supports. To overcome these problems, a
range of roller trolleys are available, to which the spring unit isattached. As the pipe expands horizontally, the roller trolley
follows the point of attachment of the rod to the pipe, thus the
angle of the sling rod is maintained within approximately 2 - 3to the vertical. Full details of these units are available on
request.
Constant Effort Supports/10
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Recommended