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Section 4 Periodical and other surveys
401. Kinds of surveys
1. Annual Survey
Annual Surveys are to be carried out within 3 months before or after the anniversary data from the completion data of the initial survey or of the previous Special Survey.
2. Special Survey
Special Surveys are to be carried out at a data of exceeding 5 years from the completion data of survey or the due data of the previous Special Survey. However, if Special Survey are carried out at a data which is to be more than 3 months earlier than the due date of Special Survey, the next Special Survey is to be assigned at the date of 5 years after the completion data of the concerned Special Survey.
3. Occasional Survey
All classed ROV's systems are to be subject to Occasional Surveys when they fall under either of the following conditions at periods other than those of Special Survey or annual Survey:
(1) When main parts of systems, or important fittings or equipment which have been surveyed by the Society, have been damaged, or are about to be repaired or altered.
(2) When safety valves are opened up or when settings of safety valves are altered.
(3) Other cases where surveys are designed or whenever survey is deemed necessary by the Surveyor.
(4) When the due dates of surveyors are to be postponed.
402. Annual Survey
The followings are to be tested and checked in Annual Survey.
1. Examination of documents relating to the ROV's system and scrutiny of the operation records.
2. The pressure vessel including all fixtures, penetrations, doors and covers, seals, locking devices etc., is to be inspected for visible damages, cracks, deformation, corrosion and fouling.
3. The entire power supply system including the emergency supply of the ROV's system is to be sub- jected to external inspection.
4. Switching from the main to the emergency electricity supply is to be tested.
5. Insulation measurements are to be performed on the electrical equipment.
Guidance Relating to the Rules for the Classification of Underwater Vehicles 2015 27
Pt 2 Underwater Equipments
Ch 1 Remote-Operated Vehicles (ROVs) Pt 2, Ch 1
6. The accuracy of all important instrument readings is to be checked (e.g. depth gauge, gas analyzer, etc.)
7. All emergency systems are to undergo a function test.
8. The launch and recovery system is to be checked for visible damages, cracks and deformation and is to undergo a functional test including an emergency brake test (power failure)
9. All high-pressure gas supply, charging hoses and umbilical are to be checked for visible damage and tightness.
10. Performance of a tightness test on the pressure vessel at maximum permissible operating pressure using air.
11. Verification of the setting pressures and resetting pressure of safety valve and safety device and alarm system
12. Function test on control station, overall system and electric system.
13. Function test on all alarm systems
14. Operation test on Launch and recovery system.
15. Measurements on Launch and recovery at the corrosion and abrasion part.
16.
For 10 years over, hydraulic test is to be carried out on all pressure vessels and if necessary an
endoscope inspection may be added.
403. Special Survey
In Special Survey the followings are to be tested and checked in addition to the items specified in Annual Survey.
1. A tightness test is to be performed on the pressure vessel at 1.1. times the maximum permissible operating pressure using air
2. Non destructive test on the welding parts and thickness measurement on the pressure vessel, etc.
3. Emergency ballast release and buoyancy test.
4. Pressure vessel and its apparatus not capable of satisfactory internal inspection and those whose sat- isfactory condition cannot be definitely established by internal inspection are to be inspected by non- destructive test or hydraulic pressure test.
5. Where necessary overhaul inspection on the hydraulic cylinder, etc. of hydraulic system.
404. Postponement of Special Survey
If ROV's system at the time of the Special Survey is not in a port in which it is to be sur- veyed or if ROV's system is in transit to another port to be surveyed, the due date of Special Survey may be postponed within the period of 3 months at the request of the owner through the approval of the Society.