Leakproofness detection method for drain plug of ship bottom in ship construction

Abstract

The invention relates to a leakproofness detection method for a drain plug of a ship bottom in the ship construction. The method comprises steps of firstly determining test pressure for leakproofness detection of the drain plug; covering the drain plug of the ship bottom with a special detection device by means of a lifting-up device; injecting compressed air in the special detection device so as to reach the abovementioned test pressure; and spraying a soap liquid at one side of the internal of a drain plug ship body. According to the invention, under a precondition that the paint of a ship body is not destroyed, the leakproofness condition of the drain plug of the ship bottom can be rapidly detected, secondary docking of the ship is prevented, and the ship construction period is ensured.

Description

technical field [0001] The invention relates to ship construction, in particular to a method for detecting the tightness of ship bottom discharge, and can be applied to other places where tightness detection is required. Background technique [0002] Normally, the tightness of the hull drain plug itself has been tested after production, and has been approved by relevant agencies. During the ship construction process, it only needs to be welded with the hull structure, and then the weld between it and the outer plate is tested. That's it. The welding seam between the drain plug and the shell plate is vacuumized, and the test pressure is -0.02MPa~-0.026MPa. However, the tightness of the purchased drain plug cannot be guaranteed. If the ship finds that the drain plug leaks during the trial voyage, it needs to be docked again for replacement, and the replacement drain plug should be tested for tightness. The second docking of the ship not only affects the ship construction cyc...

AI Technical Summary

Problems solved by technology

There are two problems with this method: First, the structural integrity of the cabin in the dock stage is poor, and it is difficult to inflate the cabin. Usually, the cabin inflation is completed at the dock stage

Second, the pressure value required by the classification society for cabin inflation is 0.015Mpa~0.02Mpa. Usually, the draft of such ships as bulk carriers, oil tankers, and container ships is above 10 meters. According to the pressure formula P=ρgh, that is, the pressure of the discharge plug at the bottom of the ship is above 0.1Mpa, and according to safety considerations, the pressure of the cabin inflation cannot meet the actual pressure of the discharge plug during the voyage

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