Clasification Society Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, January 2016 - Part 10 SHIP UNITS - Chapter 1 General Requirements - Section 19 Fatigue
Section 19 Fatigue
19.1 General
19.1.1 The fatigue life is to be assessed in accordance with the LR ShipRight Procedure for Ship Units and Pt 4, Ch 5, 5 Fatigue design.
19.2 Factors of safety on fatigue life
19.2.1 The factors of safety defined in Pt 4, Ch 5, 5.6 Factors of safety on fatigue life are to be applied to the hull
structure. Examples are given in Pt 10, Ch 1, 19.2 Factors of safety on fatigue life 19.2.1.
Table 1.19.1 Example factors of safety on fatigue life for hull structure
| Location | Inspectable/repairable? | Substantial consequence of failure? | Fatigue life factor |
| Bilge keel in way of ballast tanks or void spaces |
Wet (OIWS) |
No (no pollution) |
2 |
| Bilge keel |
Wet (OIWS) |
Yes (pollution) |
4 |
| LNG pump tower attachment points (top dome penetrations and bottom base support penetrations) |
No (covered by insulation) |
Yes (loss of primary and secondary barriers) |
10 |
| LNG pump tower | Dry |
Yes (loss of primary and secondary barriers) |
2 |
| Bottom longitudinal stiffener end connections inway of ballast tanks or void spaces | Dry |
No (no pollution) |
1 |
| Bottom longitudinal stiffener end connections | Dry |
Yes (pollution) |
2 |
| Double hull hopper knuckle connection | Dry |
No (no pollution) |
1 |
| Stiffened plate module supports attachment to upper deck | Dry | No | 1 |
| Lattice module supports attachment to upper deck | Dry | Yes | 2 |
| Lattice module supports attachment to upper deckwith single member redundancy | Dry | No | 1 |
| Hull structure bounding membrane LNG tanks |
Equivalent to wet (repair will damage insulation) |
No | 2 |
| Penetrations in upper deck for LNG tank domes |
No (covered by seal) |
No | 3 |
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