Answer
A- As per IACS URZ33.1 -
1.The owner is to notify the Class whenever the outside of the ship’s bottom & related items can be examined in DD or on a slipway
2.There is to be min. of 2 examinations of the outside of the ship’s bottom & related items during each 5 year special survey period. One such examinant is to be carried out in conjunction with special survey. In all cases the examinant of interval b/w any 2 such examntn is not exceed 36 months
3.Any extnsn of the ship’s bottom of 3 months beyond the due date can be granted under exceptional circumstances.
4.Examinations of the outside of the ship’s bottom & related items of ships is normally to be carried out with the ship in DD.
5.Consideration may be given to alternate examinant while the ship is afloat as an IW survey. Special Consideration is to be given to ships of 15 years or over before being permitted to have such examinant 6.For ESP ships of 15 years of age & above, such examinant are to be carried out with the ship is in DD. 7.The IWS is to provide the informant normally obtained from a docking Survey. Special Consideration shall be given to ascertaining rudder bearing clearances and stern bush clearances of oil stern brings based on a review of the operating history, onbord testing & stern oil sample reports. This considerations are to be included in proposals in advance so that the arrangements can be agreed with the class.
8.The IWS is to be carried out with the ship in sheltered water & with weak tidal streams & currents. 9.The IW visibility & the cleanliness of the hull below the Waterline is to be clear enough to permit a meaningful examination which allows the syrvyor & IWS firm to determine the condition of the plating & the welding
10.The class is to be satisfied with the methods of the divers or ROV (Remotely Operated vehicles) on the plating, which should make use of permanent markings on the plating at selected points.
11.An IWS plan should be submitted to class & include –
a.Scheduled time & location for survey,
b.name of approved diving company,
c.Means of cleaning of hull bellow W.L.,
d.Means of access for examinant of sea chests, sea valves & box coolers,
e. Provisions for determining the condition of anchoring eqpt., ranging of anchor chain cables & examining the chain lockers when due for survey & as required.
f.Provisions for surveying & maintain sea connections including thickness measrmnts of sea-chests g.Conditions for internal examintn of double bottom/ ballast tnks etc.
12.Prior to commencement for the IWS, a survey planning meeting is to be held b/w the attending surveyor(s), owner representive in attendance, the diving company & the master of the ship or personnel appointed by the owner for the purpose of ascertaining as per survey plan & to ensure the safe & efficient conduct of the survey work to be carried out.
A Comrehensive reports of findings, g augngs, clearances and any work undertaken including recordings of CCTV images, must be submitted by the Shpownr to all the involved parties
Survey Findings
1.If the IWS reveals, damage, deterioration or other condtns that requires early attntn, the surveyor may require that the ship to be DD
2.If the temp. repairs carried out to any Undrwatr parts are considered acceptable these must be made permanent with a due date decided by the surveyor
3.The owner is to request the class to perform a survey in DD in any event or circumstances in the operation of the ship which could have led to UW damages or deterioration in the crew’s knowledge.
4.If the coating condition is DB tanks, void spaces & dry spaces is found in less than gud condition, the owner is to restore the coating to Gud.
In water survey vs Under water Survey
UnderWater Survey | InWater Survey | |
1. | The purpose of an UWS is to examine ship and make sure that it complies with the regulations & safety standards. | It is a specifict ype of underwater survydone to assess the condition of parts of the underwater hull & other parts without requiring it to be drydocked for inspection. It can take the place of Drydock. |
2. | These surveys can be routine inspections or may cover tasks such as damage surveys, repair surveys or sometimes done prior to Dry doc to ascertain the condition of hull & determine scope of repairs | It is conducted while the ship is anchored and remains afloat in sheltered waters at light draft and is preferably done in daylight hours. |