Construction method of ship fresh water tank coating layer

Abstract

The invention relates to a construction method of a ship fresh water tank coating layer. The construction method comprises the following steps: (1) the cleaning is performed in a segmentation phase; (2) sand is blasted; (3) the precoating is firstly performed to spray a whole area to be coated; (4) a scaffold is built in a fresh water tank in a gathering phase; a dehumidifier pipe is arranged in the tank; and the ventilation and the dehumidification are performed; (5) the state of a maintenance coating layer constructed in the segmentation phase is checked; (6) the precoating is firstly performed on structure edges and places difficultly sprayed or incapable of reaching a stated film thickness; and then, the main coating layer is sprayed on the whole area to be coated; and (7) the fresh water dipping after anti-explosion qualification and tank sealing; and in the segmentation phase, general epoxy primers are adopted as maintenance primers for the fresh water tank, so that the steel plate roughness retained in segmented sand rushing is maintained, the large-area sand rushing and sucking cost of the fresh water tank after ship launching is saved, and the risk of damaging equipment in the tank by possible pollution is prevented.

Description

technical field [0001] The invention relates to the field of ship coating, in particular to a construction method for coating a ship's fresh water tank. Background technique [0002] The water stored in the ship's fresh water tank is tap water for the crew to bathe and clean, so the shipowner has high requirements for the coating quality of the fresh water tank. As we all know, the quality of the one-time finish of the coating is the best, especially for the solvent-free epoxy paint used in the freshwater tank. The whole spraying is conducive to the formation of a complete mesh tension film. Like a patch, it will not be able to reconnect with the original coating to form a network. At present, there are two traditional construction methods for the freshwater tanks of most ships: one is to wash sand and paint in stages until completion, and repair and close the damaged areas in the closing stage before reporting to completion; the other method is to not paint in sections and...

AI Technical Summary

Problems solved by technology

[0003] Both of these two construction methods are unreasonable. In the first method, the adhesion of the repaired coating in the damaged area has always been questioned. The overlap between the old and new coatings is also a place where hidden dangers are likely to occur. Shipowners Rework requirements are often raised for these areas; the coating quality of the second method is the best, but the shipyard usually cannot bear the risks that may arise during construction. The fresh water tank is located deep inside the engine room, and the overall sand washing is likely to cause damage to important equipment in the engine room. Pollution, and the placement of construction equipment such as sand washing machines and the problem of sand suction are all difficulties in shipyard control