constant load supports

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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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NOTE:

Type R not recommended over 150mmTravel or Size 33.

NOTE:

Type S & T

Not recommended over:

190 Travel Sizes 1 to 12




500 Travel Sizes 34 to 39 or for all Travels, Sizes 40 to 66


TYPE V TYPE R

TYPICAL YOKE

ARRANGEMENT(USED ON SPRING SIZES

48 TO 66 ALL TYPES)

0

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* ACCESS TO LOAD

ADJUSTER

TYPE TTYPE U

TYPE X TYPE Z

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TYPE S TYPE W



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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TYPE Y

GG

CC

CC

HH

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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


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



420 TRAVEL FOR FRAME SIZE 19 - 26 & 27 - 33



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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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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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pp

HEIGHT B CALCULATED WHEN LOAD

ARM IS IN HIGH POSITION.

FOR UP TRAVEL, INSTALLED HEIGHT

EQUALS B MINUS UP TRAVEL.


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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.


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

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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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constant load supports

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