8.Describe the annual airtight integrity test and examination that is required to be carried out on an inflatable or rigid inflatable craft.
(10)
Annual Airtight Integrity Test and Examination of an Inflatable or Rigid Inflatable Craft (10 marks)
1. Purpose of the Test (1 mark)
- To ensure that the buoyancy tubes or compartments are airtight, maintain structural integrity, and retain pressure over time, providing adequate buoyancy and stability for safe operation.
2. Preparation for the Test (2 marks)
- The craft should be cleaned, dried, and visually inspected externally and internally for damage before testing.
- Remove any loose equipment or water from compartments.
- Ensure valves, seams, and inflation points are free from dirt or obstruction.
- Check that inflation equipment (hand pump, pressure gauge) is properly calibrated and approved for use.
3. Inflation Procedure (2 marks)
- Inflate each air chamber separately to the manufacturer’s recommended pressure—usually between 20–25 kPa (2.9–3.6 psi).
- Record the ambient temperature and pressure, as air expansion will vary with temperature.
- Allow the craft to stand for at least one hour before beginning the pressure-holding test.
4. Airtight Integrity (Leak) Test (3 marks)
- After stabilisation, monitor the pressure in each chamber for at least 6 hours (some administrations specify 12–24 hours).
- Permissible pressure loss is typically no more than 10% of the original inflation pressure.
- Inspect seams, valves, and fittings for leaks using an approved leak-detection method, such as:
- Soapy water or detergent solution brushed over joints and seams – bubbles indicate leakage.
- Audible or electronic leak detectors in quiet conditions.
- If leaks are found, mark their locations for repair, deflate, and patch according to the manufacturer’s instructions.
5. Examination of Structure and Attachments (1 mark)
- Inspect the rigid hull (if fitted) for cracks, delamination, or corrosion.
- Check transom fittings, lifting points, towing eyes, seat mounts, and D-rings for wear or movement.
- Examine valve operation for free movement and sealing.
6. Identification, Marking, and Records (1 mark)
- Ensure the craft’s serial number, capacity plate, and identification markings are legible.
- Record the test results, noting:
- Inflation pressures before and after the test.
- Any leaks or repairs made.
- Inspector’s name and date.
7. Certification and Compliance (Optional, included for full marks) (1 mark)
- The test must be conducted or verified by a competent person or approved service station in accordance with flag-state or manufacturer’s requirements (e.g., MCA, SOLAS Chapter III).
- On satisfactory completion, issue an airtight integrity test certificate valid for 12 months.