TYPE
CONFIDENTIAL
STANDARD NO.
OSM-Q-1027
UNDERWATER INSPECTION OF SHIPs TITLE
PRE.DATE
May 17, 2017
PROCEDURE REV.DATE
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REVISION
0
PAGE
11
PREPARED BY
REVIEWED BY
REVIEWED BY
TEAM / POSITION
NDT Level III inspector
QAQC Team Leader
Deputy CEO of Production
NAME
Mohammed Patel
Seong Il Kim
Ahmed Al Abri
CONTENTS
CLASSIFICATION
CONTENTS
PREPARED REVIEWED APPROVED
N O I S I V E R
0
May 10, 2017
PROCEDURE NO. RELATION STANDARD
OSM-Q-1027
Mohammed Patel
PROCEDURE TITLE
INTERFACING TEAM
UNDERWATER INSPECTION OF SHIPs PROCEDURE
External disclosure of this document is prohibited without permission.
STANDARD NO.:OSM-Q-1027
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CONTENTS
1. Scope
3
2. Purpose
3
3. Responsibility and Authority
3
4. Reference Documents
3
5. Pre Inspection Requirements
4
6. Equipments
5
7. Survey
5
8. Reporting
6
9. Attachments
7
Attachment-1 :
8
Attachment-2 :
9
Attachment-3 :
10
Attachment-4 :
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Scope This procedure is applicable when under water inspection is requested by Owner/Yard as an alternative to Dry-docking Inspection with the approval of related class society for the vessels age is not 15 years or more.
2.
Purpose By using transmitting system of the captured image to the monitor in mode of real time (CCTV or underwater television). Such a fault detection of the ship afloat without necessity of docking enables to carry out a qualitative examination of the hull shell plating, moreover to check its anode and cathodic protection and fasteners, state of plates in the shell plating, to define availability and localization of dents, cracks or fractures, to inspect the sea valve gratings, to inspect the propulsion/steering unit by measuring the bearings sag of the rudder blade stock and stern gear. Inspection afloat makes it easier to identify the possible risks and better to define the list of the forthcoming repair works.
3.
Responsibility and Authority
3.1
Team Leader of quality management team is responsible for edition and revision of this procedure including test and supervision.
3.2
Team Leader of quality management team is responsible for receiving all requests for Underwater Inspection in Lieu of Dry-docking Survey from ship owner as well as submission of this request and related required documents to class surveyor.
3.3
The Team Leaders of relevant teams are responsible for arranging qualified and certified "DIVERS" as well as equipment's necessary for underwater inspection.
4.
Reference Documents
4.1
ABS GUIDE FOR THE UNDERWATER INSPECTION IN LIEU OF DRYDOCKING
5.
Pre inspection requirements
5.1
All requests for Underwater Inspection in Lieu of Dry-docking Survey are to be forwarded to the applicable class surveyor for review and authorization.(Attachment-1)
5.2
Plans showing the following items are to be submitted to the attending Surveyor, together with the proposed inspection procedures for review, well in advance of the inspection.
5.2.1
Location of bottom shell seams and butts (Shell Expansion), including any doublers, straps, bottom plugs, appendages and all underwater openings.
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Hull markings or other means to orient the diver and identifying photographs, which entail specific areas of plating, (e.g., locations of bulkheads or tanks) sea suction and discharge openings, propeller blades and rudder surfaces. Such preparations may include a weld bead grid system on the hull, a contrasting color coating system, a movable grid, an acoustic locating system, or any other arrangement that is satisfactory to the Surveyor.
5.2.3
Reference data and instructions to the diver for any necessary underwater operations such as means of access to sea chests to inspect the external side of hull connections and sea values, to rudder bearings to determine clearances of rudder bearings or to propeller shaft strut and stern bearings.
5.2.4
If available most recent gauging reports from last Special Periodical Survey and the as-built scantlings for the underwater body.
5.3
Underwater inspection is to be carried out by a qualified diver under the surveillance of the attending Surveyor. The diver is to be employed shall be approved by classification society with the ship at a suitable draught in sheltered waters and with weak tidal streams and currents.
5.4
Certificate of approved diver shall be submitted to class for review.
5.5
Method of pictorial representation shall be satisfactorily good enough in terms of picture/video quality so inspection can be performed with acceptable sensitivity and ease.
5.6
Prior to commencing the In-water Survey, the equipment and procedures for both observing and reporting the survey are to be agreed between the Owners, the Surveyor and the diving firm.
5.7
Good two-way communication between the Surveyor and divers is to be provided.
5.8
Review of vessel’s records to ensure that no unusual repairs have been required and/or recently made to the vessel.
5.9
UWILD may not be applicable if there are outstanding recommendations for repairs to propeller, rudder, stern frame, underwater structure, or sea valves found during review of documents for the ship.
5.10
It may also be inapplicable if damage affecting the fitness of the vessel is found during the course of the survey.
5.11
The vessel’s underwater body is to be sufficiently clean and the sea water is clear enough to permit meaningful examination and photography by the diver. “Sufficiently clean” is taken to mean that sections of the underwater body, including flat keel plating forward, amidships and aft, are cleaned to the extent that the Surveyor can determine the condition of the plating, the welding and the coating.
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Additional cleaning may be necessary. Overall or spot cleaning may be required at the discretion of the attending Surveyor.
6.
Equipment's
6.1
The systems of the underwater video observation can be analog and digital. System shall be able to record information at the specified depth.
6.2
Equipment shall be wired analog chambers or digital monochrome chambers protected by the watertight housing. The chambers are equipped with system of light-emitting diodes or infrared reflector for good lighting of the inspected objects. The signal is transmitted by special reinforced cable and the information is displayed for estimation.
6.3
The up-to-date system CCTV shall be completely power independent and power shall be supply from the storage battery.
6.4
Equipment user manual shall be provided to diver as well as any other persons involved in underwater inspection in order to thoroughly review the operating.
6.5
If calibration is required for instruments/gauges utilized during inspection shall be calibrated at least once a year.
7.
Survey Requirements
7.1
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. Necessary equipment to visualize the inspection area are to be provided to enable the Surveyor to accomplish this visual inspection.
7.2
An examination of the entire vessel below the waterline is to be carried out by an approved diver using closed-circuit television with two-way communication. The progress of the dive is to be monitored by the onboard QC representative and/or Surveyor as required.
7.3
The shell
7.3.1
Plating is to be examined for excessive corrosion, deterioration due to chafing or contact with the ground and for undue unfairness or buckling. Special attention is to be given to the connection between the bilge strakes and the bilge keels.
7.4
Stern Bearing
7.4.1
Necessary arrangements are to be provided to ascertain that the seal assembly remains intact on oillubricated bearings and to verify that the clearance or wear down is within limits on the stern bearing.
7.4.2
For oil-lubricated bearings, this may require the review of operating history and onboard testing including accurate oil-loss records and a check of the oil for contamination by sea water or white metal and/or oil sample reports (considerations are to be included in the proposals for UWILD). For wood or rubber bearings, an opening in the top of the rope guard and a suitable gauge or wedge is sufficient for
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checking the clearance. Any doubt on wear-down of oil-lubricated metal stern bearings from above is to be further checked by external measurements or by the vessel’s wear -down gauge, where the gauge wells are located outboard of the seals or the vessel can be tipped. For use of the wear-down gauges, up-to-date records of the base depths are to be maintained onboard the vessel. Whenever the stainless steel seal sleeve is renewed or machined, the base readings for the wear-down gauge are to be re-established and noted in the vessel’s records and in the survey report.
7.5
Rudder Bearings
7.5.1
Means and access are to be provided to determine the condition and clearance of the rudder bearings, and verify that all parts of the pintle and gudgeon assemblies are intact and secure. This may require bolted access plates and a measuring arrangement.
7.5.2
Where it is deemed impractical, clearance verification on the rudder pintle may be dispensed with if the attending Surveyor is satisfied with the physical condition and securing arrangements of the pintle, the operating history and the onboard testing. These considerations are to be included in the proposals for UWILD.
7.6
Sea Suctions
7.6.1
Means are to be provided to enable the diver to confirm that the sea suction openings are clear. Hinged sea suction grids may be used to facilitate this operation.
7.7
Sea Valves
7.7.1
Sea valves and their attachment to sea chests are to be examined externally, including expansion pieces in sea water cooling and circulating systems.
8.
Reporting
8.1
Survey shall be photographically or in video mode to be documented, or both. Items that must be recorded on the tape/photograph include but are not limited to: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
8.2
Time at which dive commences Point of commencement Time viewed Conditions of hull markings Random areas of plating All sea chests All inlets and discharges Rudder Pintles Propeller Time and point of completion of the dive
Examination is to be supplemented by the diver’s report (see attachments 2 to 4) 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.
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Damage and corrosion areas are to be taped / photographed. Internal examination or thickness gauging of such locations may be necessary, as determined by the attending Surveyor. Means are to be provided for orienting and identifying underwater surfaces in photographs.
9. ATTACHMENTS Attachment-1: Request For Under Water Inspection In Lieu Of Dry-docking (UWILD) Attachment-2 : Inspection Sheet for Rudder Bearings Attachment-3 : Inspection Sheet for Stern Tube Wear down Attachment-4 : General Inspection Sheet
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Attachment-1: Request For Under Water Inspection In Lieu Of Dry-docking (UWILD)
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Attachment-2 : Inspection Sheet for Rudder Bearings
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Attachment-3 : Inspection Sheet for Stern Tube Wear down
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Attachment-4 : General Inspection Sheet
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