Variable Spring Load Tables

Variable Springs>Load Tables               Get Pricing on this item                                                         Download PDFDownload Printable English Load Tables
                                                                                                                                  Download PDFDownload Printable Metric Load Tables
Variable Spring Load Tables
English Units

Load Selection Procedure - English Units
Variability is the key principle in selecting the figure and size of a variable spring support. Variability is determined by calculating the change in percentage of the supporting force of a variable spring between the hot (operating) and cold (installed) loads using the following formula:

Variability = Movement x Spring Rate
                        Hot (operating) Load

If the variability is in question, a lower variability is more desirable. The lower variability does not transfer as much stress to the adjacent equipment at the cold (installed) position than a spring with higher variability. To comply with requirements of MSS SP-58 specifications, variability should not exceed 25%. If the design conditions cause the variability to exceed the recommended maximum, RILCO strongly suggests the use of one of our Constant Supports instead of a variable.

NOTE: The lower the variability the better the result.

Your RILCO “Support Team” is always available to assist you with these calculations or to recommend product choices.

Spring Hanger Figure and Size Selection
Once hot (operating) or cold (installed) load and travel have been determined in order to select the correct Spring Hanger Figure and size selection:
1. Select a spring figure (RVS-82, 268, etc.) with a working range which will accommodate the travel.
2. Find a spring size where the load is approximately in the middle of the working range loads.
3. Calculate the missing load (either Hot or Cold) by using the following formulas:
Hot (operating) load = Cold (installed) load - (Travel x Spring rate)
                                                     or
Cold (installed) load = Hot (operating) load + (Travel x Spring rate)

4. Verify that both loads are within the working range, preferably equidistance from the center of the load chart.
5. If the loads are at either extreme, select a new spring size and re-calculate the missing load until both the loads are satisfactory.
6. Calculate the variability, which should not exceed 25%.

When Hot (operating) and Cold (installed) loads are known:
1. Select a spring size where both loads are ideally equidistance from the center of the load chart.
2. Calculate the movement with the following formula:
Movement = Cold (installed) load - Hot (operating) load
                                        Spring rate
3. Select a Spring figure (RVS-82, 268 etc.) which will give  a variability lower than 25%.

Variable Spring Load Chart (lbs)

Working Range (in)

Size

RVS-268

RVS-82, 268, 98, Triple & Quadruple Spring

RVS-

Quadruple

Triple

98

268

82

000

00

0

1

2

3

4

5

6

7

8

 

2

 

1-1/2

 

1

 

1/2

 

1/4

7

19

43

63

81

105

141

186

252

336

450

7

20

44

66

84

109

147

197

263

350

469

8

22

46

68

88

114

153

206

273

364

488

9

24

48

71

91

118

159

213

284

378

506

0

0

0

 

0

 

0

 

10

26

50

74

95

123

165

221

294

392

525

11

28

52

76

98

127

170

228

305

406

544

12

30

54

79

101

131

176

236

315

420

563

12

31

56

81

105

136

182

244

326

434

581

2

 

1-1/2

 

1

 

1/2

1/4

14

34

58

84

108

140

188

252

336

448

600

14

35

59

87

111

144

194

260

347

462

619

15

38

61

89

115

149

200

268

357

476

638

16

40

63

92

118

153

206

276

368

490

656

4

 

3

 

2

 

1

 

1/2

17

41

65

95

122

158

212

284

378

504

675

18

43

67

97

125

162

217

291

389

518

694

19

45

69

100

128

166

223

299

399

532

713

20

47

71

102

132

171

229

307

410

546

731

6

 

4-1/2

 

3

 

1-1/2

3/4

21

49

73

105

135

175

235

315

420

560

750

21

50

74

108

138

179

241

323

431

574

769

22

53

76

110

142

184

247

331

441

588

788

23

55

78

113

145

188

253

339

452

602

806

8

 

6

 

4

 

2

 

1

 

24

56

80

116

149

193

258

347

462

616

825

25

58

82

118

152

197

264

354

473

630

844

26

60

84

121

155

201

270

362

483

644

863

27

62

86

123

159

206

276

370

494

658

881

10

7-1/2

5

2-1/2

1-1/4

28

64

88

126

162

210

282

378

504

672

900

 

2

 

1-1/2

 

1

 

1/2

 

1/4

28

66

89

129

165

214

288

386

515

686

919

29

68

91

131

169

219

294

394

525

700

938

30

70

93

134

172

223

300

402

536

714

956

31

72

95

137

176

228

306

410

546

728

975

 

 

 

 

 

82

Spring Rate (lbs/In)

-

-

30

42

54

70

94

126

168

224

300

268

7

15

15

21

27

35

47

63

84

112

150

98

-

-

7

10

13

17

23

31

42

56

75

TRIPLE

-

-

5

7

9

12

16

21

28

37

50

QUADRUPLE

-

-

4

5

7

9

12

16

21

28

38

Variable Spring Load Chart (lbs)

Size

Working Range (in)

RVS-82, 268, 98, Triple & Quadruple Spring

RVS-

10

11

12

13

14

15

16

17

18

19

20

21

22

82

268

98

Triple

Quad

780

1020

1350

1800

2400

3240

4500

6000

7990

10610

14100

18750

25005

 

1/4

 

1/2

 

1

 

1-1/2

 

2

813

1063

1406

1875

2500

3375

4688

6250

8322

11053

14588

19531

26047

845

1105

1463

1950

2600

3510

4875

6500

8655

11495

15275

20313

27089

878

1148

1519

2025

2700

3645

5063

6750

8987

11938

15863

21094

28313

910

1190

1575

2100

2800

3780

5250

7000

9320

12380

16450

21875

29173

0

0

0

0

0

943

1233

1631

2175

2900

3915

5438

7250

9652

12823

17038

22656

30215

975

1275

1688

2250

3000

4050

5625

7500

9985

13265

17625

23438

31256

1008

1318

1744

2325

3100

4185

5813

7750

10317

13708

18213

24219

32298

1040

1360

1800

2400

3200

4320

6000

8000

10650

14150

18800

25000

3340

1/4

 

1/2

 

1

 

1-1/2

 

2

 

1073

1403

1865

2475

3300

4455

6188

8250

10982

14592

19388

25781

34382

1105

1445

1913

2550

3400

4590

6375

8500

11315

15035

19975

26563

35424

1138

1488

1969

2625

3500

4725

6563

8750

11647

15477

20563

27344

36466

1170

1530

2025

2700

3600

4860

6750

9000

11980

15920

21150

28125

37508

1/2

 

1

 

2

 

3

 

4

 

1203

1573

2081

2775

3700

4995

6938

9250

12312

16362

21738

28906

38549

1235

1615

2138

2850

3800

5130

7125

9500

12645

16805

22325

29688

39591

1268

1658

2194

2925

3900

5265

7313

9750

12977

17247

22913

30469

40633

1300

1700

2250

3000

4000

5400

7500

10000

13310

17690

23500

31250

41675

3/4

 

1-1/2

 

3

 

4-1/2

 

6

 

1333

1743

2306

3075

4100

5535

7688

10250

13642

18132

24088

32031

42717

1365

1785

2363

3150

4200

5670

7875

10500

13975

18575

24675

32813

43759

1398

1828

2419

3225

4300

5805

8063

10750

14307

19017

25263

33594

44801

1430

1870

2475

3300

4400

5940

8250

11000

14640

19460

25850

34375

45843

1

2

4

6

8

1463

1913

2531

3375

4500

6075

8438

11250

14972

19902

26438

35156

46885

1495

1955

2588

3450

4600

6210

8625

11500

15305

20345

27025

35938

47926

1528

1998

2644

3525

4700

6345

8813

11750

15637

20787

27613

36719

48968

1560

2040

2700

3600

4800

6480

9000

12000

15970

21230

28200

37500

50010

1-1/4

2-1/2

5

7-1/2

10

1593

2083

2756

3675

4900

6615

9188

12250

16302

21672

28788

38281

51052

 

1/4

 

1/2

 

1

 

1-1/2

 

2

1625

2125

2813

3750

5000

6750

9375

12500

16635

22115

29375

39063

52094

1658

2168

2869

3825

5100

6885

9563

12750

16967

22557

29963

39844

53136

1690

2210

2925

3900

5200

7020

9750

13000

17300

23000

30550

40625

54178

Spring Rate (lbs/In)

 

82

 

 

 

 

520

680

900

1200

1600

2160

3000

4000

5200

7080

9400

12500

16670

260

340

450

600

800

1080

1500

2000

2660

3540

4700

6250

8335

268

130

170

225

300

400

540

750

1000

1330

1770

2350

3125

4167

98

87

113

150

200

267

360

500

667

887

1180

1567

2083

2778

TRIPLE

65

85

113

150

200

270

375

500

665

885

1175

1563

2084

QUADRUPLE