RATE CONTRACT FOR HIGH PRESSURE JET WASHING, SURFACE PREPARATION AND MAINTENANCE PAINTING OF EXTERNAL UNDERWATER HULL - IN VESSELS

Anode Masking (quantity refers to no of vessels). Masking of all ICCP anodes and Reference Electrodes using blasting tapes/ reusable custom made anode covers has to be undertaken to avoid any damage to anodes from impact of washing should be able to withstand 3000 PSI water pressure and painting. Direct use of adhesives/ greasy material on anodes should be avoided. Masking is required to be water/ dust proof. The same has to be undertaken in two stages:- (i) Prior commencement of washing. Any sea growth on anodes have to be removed by light scraping, following which anode masking is to be undertaken. Masking has to be removed prior preliminary inspection. (ii) Prior commencement of painting. Masking of anodes is to be undertaken prior commencement of painting. The same has to be removed prior final inspection.

HP Jet washing. High Pressure Jet washing of external underwater hull at 3000 PSI for removal of soft marine growth and other contaminants on hull.

Manual Scraping. Manual scraping using long scrapers for removal of hard marine growth.

Grit Blasting. Grit Blasting to SA 2.5 standard using Chilled Cast Iron grits (Gr 27 or Gr 17).

Weather Proof Enclosure. (i) Outer hull blasting area covered with weather proof cover. Weather proof enclosure to be made out of waterproof tarpaulin sheets. Collection of grit from dock floor post completion of blasting of the underwater hull of the vessel has to be undertaken. (ii) Removal of used grit and paint flakes from dock floor.

Disking. Disking on outer water hull area for removal loose/defective layers of paint using 3mm paper. Feathering of edges to be undertaken for seamless paint application.

Chipping/ Wire brushing. Chipping/ Wire brushing for removal of paint residues, confines area for surface preparation.

Paint Application – Airless Spray. Paint Application of each coat of anti-corrosive, tie coat and Antifouling using Airless spray for achieving DFT as inspected by user. Surface cleanliness to be checked by appointed paint inspector prior painting. WFT and DFT readings to be recorded during and post curing respectively.

Paint Application – Roller/ Brush. Paint Application of each coat of primer, anti-corrosive, tie coat and Antifouling using roller/ brush for achieving DFT as inspected by user.

Draught Marking/ Snowline marking (quantity refers to no of vessels). Precision painting of draught marks at indicated locations of vessel. Dedicated highly skilled painter to be appointed for the activity.

DFT Mapping. DFT mapping of external underwater (under the supervision of qualified paint inspector) hull has to be undertaken at least three times during course of drydock period as follows:- (i) Post Surface preparation. Low DFT areas has to be marked in the hull for easy identification. (ii) Post completion of any one intermediate coat (preferably tiecoat). (iii) Post completion of work. The same has to be undertaken by dividing the external UW hull area into continuous grids of 1 sqm, with DFT being measured at each corner and center of individual grids. The average value of above five readings will be considered as the final DFT of that region.

Paint Inspection by Paint Inspectors. The firm is to employ 02 qualified paint inspectors (NACE level II or equivalent with at least 02 years of experience) for supervision of work. Defective areas is to be identified and the same has to be marked in the hull prior undertaking surface preparation. A detailed external UW hull mapping iro identified paint defect and requisite surface preparation method is to be indicated in the daily report. In addition to the log books submitted by the firm, it is required that the daily work progress be recorded as per the vessel specific format specified by the user. Frequent analysis of paint condition and restoration process is to be undertaken in close liaison with OEM representatives.

ASMACS

VENNEL ENGINEERING WORKS

SRI VENKATESWARA ENTERPRISES

Patel Engineering Works Vizag