Calculate bolt torque from bolt load.
The bolt pitch diameter can be calculated for either ANSI or ISO threads. The mean radius of the nut face can be taken as the middle diameter between the bolt diameter and the nut width across the flats. The flank angle is half of the thread angle: 30 degrees for v threads (ISO NPT UTS), 27.5 degrees for Whitworth and BSP threads, and 0 degrees for square threads. Typical values of friction factor vary between 0.05 and 0.4. The friction factor is assumed to be the same for both the bolt thread and the nut contact face.
Reference : Australian Standard AS 2885.1 : Pipelines - Gas And Liquid Petroleum Part 1 : Design And Construction
Tool Input
- syutype : Stress Schedule
- mattype : Bolt Material Type
- SMYSu : User Defined Specified Minimum Yield Stress
- bolttype : Bolt Schedule
- diabtype : Bolt Size
- Du : User Defined Bolt Diameter
- Pu : User Defined Pitch Length
- TPIu : User Defined Threads Per Inch
- areatype : Bolt Tensile Area Type
- Axu : User Defined Bolt Tensile Area
- satype : Design Stress Type
- Sau : User Defined Bolt Allowable Stress
- dfactype : Stress Design Factor Type
- Fdu : User Defined Stress Design Factor
- pitchtype : Bolt Pitch Diameter Type
- fpu : User Defined Bolt Pitch Factor
- Dpu : User Defined Bolt Pitch Diameter
- angletype : Thread Flank Angle Type
- αu : User Defined Thread Flank Angle
- Dc : Nut Mean Contact Diameter
- Nd : Bolt Load
- μ : Friction Factor
Tool Output
- α : Bolt Thread Flank Angle
- λ : Bolt Helix Lead Angle
- Ax : Bolt Tensile Area
- D : Bolt Diameter
- Dp : Bolt Pitch Diameter
- Fac : Torque Factor
- Fd : Stress Design Factor
- Na : Bolt Design Load
- P : Bolt Thread Pitch
- SMYS : Yield Stress
- Sa : Bolt Design Stress
- Sd : Bolt Stress
- Sd/Sa : Bolt Stress Over Design Stress Ratio (≤ 1)
- T : Bolt Torque
- TPI : Bolt Threads Per Inch