hull plate renewal

1     As a chief officer write a dry dock specification for the repair for the repair of following damage that has occurred, stating what factors must be considered when costing the repairs.” approx. 2 meters of damage to Forepeak tank shell plating must be removed and replaced along with relevant damaged stiffeners. In your specification, include the services required, accessory work required and final tests required to ensure satisfactory completion of the repair. 

Steel renewal in no fore peak  ballast tank

Please quote for following scope of work to be carried out during the period of dry docking 

tank capacity 5000 m³(sea water)

open manhole covers 02 nos on deck size 680mmX480mm for the inspection and to be boxed back after the repair with new jointings indicate repair cost for replacement of studs.

provide ventilation blowers for the tank during repair indicate cost per day

provide lighting to the tank

provide man entry certificate and hot work permit during the period of repair

clean the ballast tank and hose down prior to commencement of the repair

erect staging from frame no 46 to 51 at second stringer level to required height and to remove on completion

erect staging from frame no 46 to 51 for the outside shell on port side to 8meter height from ships baseline and to remove on completion

crop and renew the damage section of approx.; 02 square meters side shell plating with damaged frames in way of the plating area with classification approved materials. the material specification andthickness is clealy marked on the shell expansion drawing provided and details of the frames are included in the drawing for preparation.

Marerials certificates welding procedure and qualified welders are to be provided during the repair

work to be completed to the satisfaction of the classification society surveyor

on completion of the plate renewl vaccum test or hose test to be done on the plates.

Apply paint scheme   with inside the tank as per the attached specification

Paint supplied by ship

Outside the hull apply the yard supplied paint two coats of anticorrosive and anti-fouling paint coating thickness 300 microns are to applied paint supplied should have anti fouling approval certificate

Clean all debris generated during repair from the tank 

Tank will be pressure tested by ship staff on completion of the repairs by filling with sea water

Al above wok to be carried out to the satisfaction of the classification society surveyor