JP2020189616A - High pressure gas discharge pipe for compression type lpg transportation vessel - Google Patents

Abstract

To solve a problem that when residual cargo vapor in a tank is discharged at transfer of the cargo in a present compression type LPG vessel, it is discharged into air by opening a manifold while taking into consideration influence to surrounding vessels, and discharged out of a vessel congestion water area after sailing at a certain distance after departure, thereby having been pointed out that this casts a great burden in labor of onboard crews and work hours at the transfer of cargo, and in addition, there has been instances of being mistakenly recognized as an accident from other vessels by having cargo vapor discharged into the atmosphere becoming white vapor.SOLUTION: A fixed type pipe is provided in a vessel and gas is exhausted into the sea.SELECTED DRAWING: Figure 1, Figure 2

Description

The present invention relates to a high pressure gas discharge pipe of a pressurized LPG transport ship.

The discharge from the LPG tank decompression work of a conventional pressurized LPG transport vessel is released to the atmosphere.

Currently, when the residual cargo vapor in the tank is released when the cargo is transferred on a pressurized LPG carrier, the manifold is opened and released to the atmosphere, but in consideration of the impact on surrounding vessels, it travels a certain distance after departure. After running, it is released outside the congested water area of the ship. It has been pointed out that this puts a heavy burden on the crew of the ship in terms of labor and working hours when the goods are changed. In addition, the cargo vapor turned into white steam when released into the atmosphere, which was sometimes mistaken for an accident by another ship.

In the present invention, the problem is solved by providing a fixed pipe to the ship and discharging gas into the sea.

By installing this equipment, the cruising time until the cargo vapor is released at the time of goods transfer after leaving the port of landing is reduced, the white steam is suppressed by releasing it into the sea, and the crew is able to use the cargo vapor. It is expected that the risk of exposure to

The upper end (2) of the discharge pipe is provided on the upper deck below the LPG tank drain discharge pipe shown on the starboard side of the MIDSHIP. On the discharge side of the discharge pipe (3), a discharge hole is provided in the bottom outer plate of the ship, and a bottom valve (1) with an outer plate is attached to the end. Connect the upper end of the discharge pipe and the LPG tank drain pipe with a rubber hose or the like. It is the figure which looked at the frame 57 to the frame 64 from the starboard side toward the center. The discharge pipe (3) faces the bottom of the ship along the ballast tank and connects to the bottom valve (1) installed in the bilge well at the rear of the No. 1 cargo hold.

During normal voyage and normal cargo handling, blinds are used at the flange above the upper deck, and a single pipe or hose is attached when discharge is required. A bottom valve is installed on the bottom of the ship to prevent backflow of seawater. When the discharge pipe is not in use, the inside of the pipe is filled with air by the bottom valve. The head pressure required for discharge is determined by the draft position of the ship, and sufficient discharge pressure can be secured to push it out.

When starting the decompression work of the LPG tank, prepare the piping. First, connect the outboard discharge pipe and the drain pipe of the LPG tank. Then open the bottom valve. For safety, when it is confirmed that there are no people in the cargo hold and the valve at the end of the drain pipe is opened, the LPG pushes out the seawater inside the discharge pipe and releases the gas outboard. At that time, the hull is moved forward, and the steam of the cargo vapor is agitated by the water flow of the propeller. As a result, LPG is dispersed in the sea at the rear of the ship, and gas does not stay on the upper deck during discharge work.

1 Ship bottom valve 2 Upper deck penetration 3 Gas discharge pipe

Claims (2)

High pressure gas discharge pipe in a pressurized LPG transport vessel (3). Ship bottom valve (1), deck penetration (2), and equipment associated with claim 1.

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