When opening a watertight door to check a...

Question 1 of 270705eccef9fbacbc34ba4d46a24

When opening a watertight door to check a compartment suspected of flooding, which of the dogs shown in the illustration should you back off FIRST? See illustration SF-0019.

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Question 1 of 27070

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When opening a watertight door to check a compartment suspected of flooding, which of the dogs shown in the illustration should you back off FIRST? See illustration SF-0019.

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🔍 Key Concepts

• Relationship between hinge side vs. dogging side on a watertight door • How a door pivots on its hinges and which edge opens first • Why you want to crack the door at the safest, highest point when flooding is suspected

💭 Think About

• Looking at the hinges in the illustration, which edge of the door will actually move away from the frame first as you begin to open it? • If the compartment is flooded, where will the water pressure be greatest, and where can you loosen a dog to test for flooding with the least risk of the door blowing open? • Which numbered dog is closest to the point that will start to gap first at the top when the door swings on its hinges?

✅ Before You Answer

• Identify clearly which side in the picture is the hinge side and which is the opening (free) side • Confirm which direction the door will swing and which corner/edge lifts off the gasket first • Make sure the dog you choose would let you crack the top safely while the remaining dogs still hold most of the door closed