BOLT TENSIONER APPLICATION
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| 50% Tool Coverage |
100% Tool Coverage |
Important formula:
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| Residual Bolt Load |
Bolt Stress x Bolt Tensile Stress Area
(Bolt Stretch x Modulus of Elasticity x Bolt Tensile stress area) Effective Length) |
| Bolt Tensile Stress Area |
(3.14 x D x D) / 4 (D is smallest Stress Dia Bolt) |
| % of Yield Strength |
(Bolt Stress Required / Yield Strength of bolt) x 100 |
| Hydraulic Pressure |
(Residual Bolt Load x Load Relaxation Factor) / Hydraulic Area of Load Cell. |
| Lond Relaxation Factor |
1.01 + (Bolt Size (Dia.) / Effective Length) or 1.1 which ever is greater. |
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Basic Calculation and Working:
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- Calculate Bolt Residual Load: Residual Load can be calculated from known stress or bolt stretch requirement.
- Calculate Load Relaxation factor using Bolt Dia and Effective Length. It can be calculated from below formula / Chart.
- Calculate application hydraulic load.
- Calculate hydraulic pressure for required hydraulic load.
- Select Tensioning Procedure. (25%, 50%, 100%...etc.)
- Calculate pass load as applicable. (Max applied load should never exceed 95% bolt yield strength).
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| Useful Conversions |
| Area |
1 millimeter² (mm²) = 0.00155 inch²
1 centimeter² (cm²) = 0.155 inch²
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1 inch² = 645.16 mm²
1 inch² = 6.4516 cm |
| Load (Force) |
1 Metric Ton (mt) = 1.10231 Short Ton (US)
1 Kilo Niwton,kN = 224.8089 Ib
1 Metric Ton (mt) = 9.8066 kN |
1 mt = 0.9842 Long Ton (US)
1 kN = 0.0958 mt
1 st = 0.0958 mt |
| Pressure |
1 Megapascal (MPa) = Bar
1 Kg per cm² (Kg/cm²) = 0.98066 Bar |
1 bar = 14.5037 psi
1 bar = 1.0197 Kg/cm² |
| Pressure |
1 Megapasca (Mpa) = 10 bar |
1 bar = 14.5037 psi |
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impact sockets 