| Symbol | SHmin |
|---|---|
| Unit | - |
| Attribute-ID | abs_minimum_safety_factor_surface |
| Numeric ID | 5353 |
| Value Type | PMDouble |
The required minimum safety factor for contact stress SHmin is used to calculate the permissible contact stress σHP.
The following options are available acc. to ABS 2011 and ABS 2019:
| System type | SHmin |
| Main propulsion gears | 1.40 |
| Duplicated (or more) independent main propulsion gears | 1.25 |
| Main propulsion gears for yachts, single screw | 1.25 |
| Main propulsion gears for yachts, multiple screw | 1.20 |
| Auxiliary gears | 1.15 |
To obtain the pitting stress limit σHG the permissible contact stress σHP is multiplied by the minimum safety factor for contact stress SHmin. The pitting stress limit σHG divided by the contact stress σH resultis in the pitting safety factor SH.
Source: American Bureau of Shipping (ABS): Rules for Building and Classing Steel Vessels, Paramus, New Jersey - 2011 and 2019 editions