Engineering Data & Specifications

V-Band Clamp/Coupling Load Formulas

V-Band Couplings must be designed to provide an axial preload that exceeds the total in-service loads. These loads include: internal pressure; bending moments; and axial tension. For economy, the V-Band Coupling should be designed based on the minimum strength required for the application loading. See the formulas below to determine your application loads or contact a Clampco sales engineer for assistance.

Symbols
Lp = Load Intensity due to Pressure, lbs./in. of circumference
Lb = Load Intensity due to Bending Moment, lbs./in. of circumference
La = Load Intensity due to Axial Tension, lbs./in. of circumference
L = Total Load Intensity, lbs. / in. of circumference
D = Flange O.D., in.
P = Internal Pressure, psi
M = Bending Moment, in.-lbs.
A = Axial Tension, lbs.

Step 1
Determine the Load Intensity due to Internal Pressure, Lp.Lp = (P x D) ÷ 4
Step 2
Determine the Load Intensity due to Bending Moment, Lb.Lb = (4 x M) ÷ (π x D2)
Step 3
Determine the Load Intensity due to Axial Tension, La.La = A ÷ (π x D)
Step 4
Determine the Total Load Intensity by adding the results of Steps 1, 2, and 3.  L = Lp + Lb + La

Example:
A V-Band Coupling meeting the following:
Flange O.D., D = 5.00 in.
Internal Pressure, P = 200 psi
Bending Moment, M = 1000 in.-lbs.
Axial Tension Load, A = 1200 lbs.

Lp = (200 x 5.00) ÷ 4 = 250 lbs. / in.
Lb = (4 x 1000) ÷ (3.14 x 5.002) = 51 lbs. / in.
La = 1200 ÷ (3.14 x 5.00) = 76 lbs. / in.
L = 250 + 51 + 76 = 377 lbs. / in.

Step 5
Use the formula below to convert the total load intensity to an equivalent operating pressure
Formula:
(4 x L) ÷ D = P
Example:
4 x 377 ÷ 5.00 = 302 psi*

*Please note: Equivalent operating pressure does not include a Factor of Safety.

MATERIALS & TEMPERATURES
For different materials and temperatures, the pressure chart data must be corrected using the following table:
Retainer Material70°F / 21°C200°F / 93°C400°F / 204°C600°F / 315°C800°F / 427°C
301 Annealed1.88.75.68.6
316.5.47.44.42.39
Carbon Steel.5.46.43.37
BAND STRENGTH
Minimum Yield Strength for 300 Series Stainless Steel 1/2 Hard Temper in-lbs. [kilograms]
Mat. ThicknessBand Width In Inches [Millimeters]
In Inches [Millimeters].500 [12.70].625 [15.88].750 [19.05].875 [22.22]1.000 [25.40]1.125 [28.57]1.250 [31.75]
.020 [.51]1100 [499]1375 [624]1650 [748]1925 [873]2200 [998]2475 [1123]2750 [1247]
.025 [.64]1375 [624]1719 [780]2063 [936]2406 [1091]2750 [1247]3094 [1403]3438 [1559]
.031 [.79]1705 [773]2131 [967]2558 [1160]2984 [1353]3410 [1547]3836 [1740]4263 [1934]
.040 [1.02]2200 [998]2750 [1247]3300 [1497]3850 [1746]4400 [1996]4950 [2245]5500 [2495]
.050 [1.27]2750 [1247]3438 [1559]4125 [1871]4813 [2183]5500 [2495]6188 [2807]6875 [3118]
.062 [1.57]3410 [1546]4263 [1934]5115 [2320]5968 [2707]6820 [3094]7673 [3480]8525 [3867]
MATERIAL SPECIFICATIONS
Common materials used to manufacture Clampco clamps.
Corrosion Resistant MaterialCommercial DesignationProcurement Specification
Steel Sheet & StripType 301 Annealed
Type 301 1/4 Hard
Type 301 1/2 Hard
AMS 5901
AMS 5517
AMS 5518
Steel Sheet & StripType 302 Annealed
Type 302 1/4 Hard
Type 302 1/2 Hard
AMS 5516
AMS 5903
AMS 5904
Steel Sheet & StripType 304L Annealed
Type 304 Annealed
Type 304 1/4 Hard
Type 304 1/2 Hard
AMS 5511
AMS 5513
AMS 5910
AMS 5911
Steel Sheet & StripType 316 Annealed
Type 316 1/4 Hard
Type 316l Annealed
Type 316 1/2 Hard
AMS 5524
AMS 5907
AMS 5507
ASTM–A–666
Steel Sheet & StripType 321 AnnealedAMS 5510
Steel Bars & ForgingsType 410AMS 5504
Steel Bars & ForgingsType 431AMS 5628
Steel Bars & ForgingsType A286AMS 5732
AMS 5735
AMS 5737
Steel Sheet & StripType A286 AnnealedAMS 5525
Steel Sheet & StripC276 HastelloyASTM–B–575
Steel Sheet & Strip6061–T6 AluminumAMS 4027
Steel Sheet & StripInconel 718AMS 5596


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