🔍 Key Concepts

• Allowable Wind and Wave Charts purpose and what they are designed to limit on a jack-up like COASTAL DRILLER • Typical environmental factors considered for safe operations: wind, waves, and sometimes currents • Typical structural/operational inputs for a jack-up rig: displacement/total weight, leg penetration, air gap, etc.

💭 Think About

• Ask yourself: which of these choices is more of an environmental condition and which are more rig/soil parameters used to establish the chart limits? • Think about how the chart is built: does it start from the rig’s weight and leg/soil conditions, or from the sea state and current? Which of these is more likely to be a result rather than an input? • On a jack-up, what must you know about the legs and bottom conditions before you can safely apply any wind and wave limits?

✅ Before You Answer

• Identify which options relate to the rig and seabed characteristics versus metocean (environmental) conditions • Consider whether leg penetration is something that must be known before using or after using the chart • Check if current is normally plotted or limited on a chart specifically labeled as an Allowable Wind and Wave chart