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3.6 UNDERWATER INSPECTION IN LIEU OF DRYDOCKING UWILD 3.6.1 Defenition and Purpose
Underwater Inspection in Lieu of Drydocking UWILD is one of suvey type as alternate drydocking survey with conducted underwater survey with to use some equipment
for to display the result of inspection. Now, the problem with drydocking is that is very expensive and time consuming
especially if the ship just want to do an annual and intermediate survey. Beside that, with the large number of commercial vessel operating today, drydocking facilities woefully
inadequate. Therefore, the UWILD process was developed in response to these problems.
3.6.2 References Based on ABS Rules 7-A-2 about UWILD, Approval Procedure For UWILD
Class Notation
Request for UWILD Notation by OwnerOperator
Prepation and Submisson of plans to in ABS Engineering office as required
Initial survey of underwater hull markings and other means of orienting the diver during new contruction or an out water
drydocking Existng Vessel Issue Certificate of compliance with UWILD requirement
UWILD
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Figure 13 : Certificate of Compliance with UWILD Requirements
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Figure 14 : Continuous - Certificate of Compliance with UWILD Requirements 3.6.3 Requirements
1. General
a Vessel less than 15 years of age b All request for Underwater Inspection in Lieu of Drydocking Survey are to be
forwarded to the applicable ABS Divisional Assistant Chief Surveyor’s Office for review and authorization.
c Underwater inspection is to be carried out by a qualified diver under the surveillance of the attending Surveyor. The diver is to be employed by a firm approved by the the
Bureau as a service supplier. d The surveyor is to be satisfed with the method of pictorial representation, and a good
two-way communication between the Surveyor and divers is to be provided e If the Underwater Inspection reveals damage or deterioration that requires further
attention, the surveyor may require that the vessel be drydocked in order to undertake a detailed survey and necessary repairs
2. Condition
a Where possible, the underwater examination should be carried out in protected water, preferably with the weak tidak stream and current.
b The in water visibility and the cleanliness of the hull below the waterline is to be clear enough to permit a meaningful examination which allows the surveyor and in-
water survey to determine the condition of the plating, appendages and the welding. Additional cleaning may be necessary. Overal or spot cleaning may be required at the
discretion of the attending surveyor. c UWILD may not be applicable if there are outstanding recommendations for repairs
to propeller, rudder, stern frame, underwater structure, or sea valves. It may also be inapplicable if damage affecting the fitness of the vessel is found during the course of
the survey. d Underwater or internal thickness measurements of suspect areas may be required in
conjunction with the underwater inspection. Means for underwater nondestructive testing may also be required for fracture detection.
3. Procedures
a Exposed Areas
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An examination of the outside of the shell plating above the waterline and exposed portions of appendages such as propeller, rudder and rudder bearings is to be carried out by
the attending Surveyor. Means are to be provided to enable the Surveyor to accomplish this
visual inspection.
b Underwater Areas Items that must be recorded on the tapephotograph include but are not limited to:
1 Vessel’s draft
2 Time at which dive commences 3 Point of commencement
4 Time viewed 5 Condition of hull marking
6 Random areas of plating 7 All sea chest
8 All inlets and discharges 9 Rudder
10 Pintles 11 Propeller
12 Timeand point of completion of the dive The above examination is to be supplemented by the diver’s report describing and
attesting to the conditions found. A copy of this report and pertinent photographs are to be submitted to the attending Surveyor. Copies are also to be retained onboard.
c Damage Areas Damage and corrosion areas are to be tapedphotographed. Internal examination or
thickness gauging of such locations may be necessary, as determined by the attending Surveyor.
3.6.4 Equipments
1. A set of diving equipments including of swimming wearing, swimming goggles, oxygen tube, etc. For UWILD process, takes 3 divers. The first diver for to hold and direct the
camera according command from the operator. The second diver for to clean the surface of bottom plating if according surveyor that areas not clear. The third divers for safety if
suddenly one of the divers had cramps, oxygen is over without oxygen, and etc
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Figure 15 : A Set Of Diving Equipments
2. Closed-circuit television including monitor, digital video, communication tool and device arrangement
Figure 16 : Digital Video, Monitor, Communication Tool and Device Arrangement
3. Shovel is used for to cleaning the surface of bottom plating from the shell and other fouling.
Figure 17 : Shovel
4. Underwater camera is used to look condition of the hull in the water.
3.6.5 Result and Conclusion of Survey
Before doing Underwater Inspection in Lieu of Drydocking UWILD, Surveyor to ensure water visibility is clear and clean. After that, Surveyor to ensure the surface of bottom
plating free fouling minimum corrosian, damage, distorsion of plating visibel. This process is called Pre-Inspection
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Based on the result of Pre-Inspection, the underwater condition is clear, but the surface of bottom plating can not be access because fouling so much and thick. After that,
Surveyor comment for to clean up first .
Figure 18 : Surveyor Examine The Result Of Pre-Inspection 3.7 HYDROSTATIC TEST FOR PIPE CLASS II
3.7.1 Defenition
Hydrostatic test is a test to verify the structural adequacy of the design and the tightness of the pipe structure by means of water pressure.
3.7.2 Requirements Based on ABS Rules 4-6-27.3 about Hydrostatic Test For Pipe Class II
Figure 19 : Requirements of Hydrostatic Test For Pipe Class II 3.7.3 Procedures
1. Determine the pipeline that will be tested. Generally, we take pipeline from a both of blind flange.
2. Install the pressure gauge in the pipe. Then, open the valve for to put water into the pipe.
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Figure 20 : The Circuit of Pipe During Hydrostatic Test
3. Pump for to provide pressure. Capacity pressure reference there is in the drawing approval.
Figure 21 : Drawing Approval About Capacity Pressure of Pipe
4. Wait for see the result minimum 1 one hour. If the pipe is able to withstand the pressure exerted, the pipe structure will not be changed example bent and leak
3.7.4 Result and Conclusion of Survey
From the result visual inpection of Hydrostatic Test, not found changes in the pipe structure. Beside that, because there is no pressure changes during the test, it is certain that
there are no leaks in the pipe.
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Figure 22 : The Result of Hydrostatic Test 3.8 FIRE DAMPER
3.8.1 Defenition
Fire damper is one of equipment installed onboard in the ventilation network to anticipate the development of fire. In case of fire, the crew can pull rope string labeled
closed on the fire damper. Then, cover the fire damper is closed and so that the air flow into the room can be stopped. Finally, the development of the fire can be minimized
3.8.2 Result and Conclusion of Survey
The all fire damper is good condition because can good opened and closed. So, the all fire damper can be installed onboard.
Figure 23 : Type of Fire Damper
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Figure 24 : Installation of Fire Damper Onboard
3.9 VACUUM BOX TESTING 3.9.1 Reference
