🔍 Key Concepts

• Displacement and draft relationship – how a change in total weight (displacement) changes mean draft using TPI (tons per inch immersion) or the immersion factor on the Sample Load Form #4 (Drilling). • Liquid mud weight and tank data – how to find the total weight of liquid mud on the original condition (tank capacities, specific gravity, and loading percentage). • Assumptions about trim – whether the problem tells you to assume level trim and use a single mean draft, or to consider trim separately.

💭 Think About

• From the original loading condition in Sample Load Form #4, what is the vessel’s total displacement and mean draft before dumping the mud? • How many tons of liquid mud are removed when it is all dumped, and how does this change the vessel’s displacement? • Given the change in displacement, what formula or table entry on the form tells you how many inches (or feet) the mean draft will change, and in which direction?

✅ Before You Answer

• Confirm you are using the correct specific gravity and 100% volume for the liquid mud tanks listed in the original condition. • Check that you are using the TPI/immersion value at the correct draft range shown on Sample Load Form #4, not a generic or wrong column. • After calculating the draft change, make sure the new draft value is reasonable (less draft after losing weight) and matches one of the choices.