Draft Survey
A Draft Survey is a method used in shipping to determine the weight of cargo on a vessel by measuring how deep the ship sits in the water. Think of it like weighing yourself on a scale, but for massive ships. This skill is crucial for ship captains and marine surveyors because it helps determine exactly how much cargo is being loaded or unloaded, which affects payment, safety, and legal documentation. It's a fundamental skill in bulk cargo shipping, where materials like grain, coal, or minerals are transported in large quantities.
Examples in Resumes
Conducted over 200 Draft Survey calculations for bulk carrier vessels
Supervised loading operations using Draft Survey techniques on various cargo types
Certified in Draft Survey methods by Lloyd's Maritime Academy
Typical job title: "Draft Surveyors"
Also try searching for:
Where to Find Draft Surveyors
Professional Organizations
Job Boards
Online Networks
Example Interview Questions
Senior Level Questions
Q: How would you handle a significant difference between shore scale weight and draft survey results?
Expected Answer: The candidate should explain the process of rechecking calculations, investigating possible causes like density variations, trim issues, or technical problems, and the importance of documenting findings and communicating with all parties involved.
Q: What factors can affect draft survey accuracy and how do you account for them?
Expected Answer: Should discuss weather conditions, water density variations, vessel trim, hull deformation, and the importance of applying proper corrections. Should emphasize the need for multiple measurements and verification procedures.
Mid Level Questions
Q: Explain the basic principles of a draft survey to determine cargo weight.
Expected Answer: Should explain how measuring the ship's draft (water level marks) before and after loading, combined with water density readings and vessel specifications, helps calculate cargo weight.
Q: What documentation is required for a proper draft survey?
Expected Answer: Should mention survey reports, draft readings, density measurements, vessel certificates, ballast conditions, and any relevant calculations or adjustments made during the survey.
Junior Level Questions
Q: What are draft marks and how do you read them?
Expected Answer: Should explain that draft marks are numbers on a ship's hull showing how deep it sits in water, and describe the proper way to read these marks from a small boat or dock.
Q: Why is water density important in draft surveys?
Expected Answer: Should explain that different water densities (fresh, brackish, or salt water) affect how deep a ship sits in the water, which impacts cargo weight calculations.
Experience Level Indicators
Junior (0-2 years)
- Basic draft reading and recording
- Understanding of ship stability principles
- Knowledge of basic calculations
- Familiarity with maritime terminology
Mid (2-5 years)
- Independent draft survey completion
- Understanding of different cargo types
- Ability to handle discrepancies
- Knowledge of international regulations
Senior (5+ years)
- Complex problem-solving in difficult conditions
- Training and supervision of junior surveyors
- Expert knowledge of all cargo types
- Ability to handle disputes and negotiations
Red Flags to Watch For
- No knowledge of basic ship stability principles
- Inability to explain basic draft survey calculations
- Lack of physical capability to perform surveys (requires climbing ladders, using small boats)
- No understanding of maritime safety protocols
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