The DEEP DRILLER is under tow at a 20-foot...

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The DEEP DRILLER is under tow at a 20-foot draft. The rig motions are close to exceeding the limits for critical pitch and roll. The rig is also experiencing occasional pounding on the horizontal braces. In this situation you should __________.

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🔍 Key Concepts

• Tow stability and rig motions – how draft affects pitch, roll, and pounding • Ballasting strategy – why deeper draft usually changes motion characteristics in a seaway • Towline dynamics – how tow wire length affects motion and shock loading

💭 Think About

• Think about how changing from a 20-foot draft to a shallower draft would affect the rig’s ability to pitch, roll, and pound on braces. • Consider what usually happens to a towed unit’s motions when you increase the draft significantly in open water. • Ask yourself whether it is safer to act before or after the rig exceeds its critical pitch and roll limits.

✅ Before You Answer

• Compare the likely motion characteristics at shallower vs. deeper draft in a seaway for a towed rig. • Evaluate whether shortening the tow wire tends to increase or decrease shock loading and violent motions. • Decide if waiting until limits are exceeded is consistent with safe seamanship and preventative action.

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