JPS5812789Y2 - Rapture hatch - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a love charm.

In offshore crude oil storage tanks, etc., when the pressure inside the tank suddenly increases due to an internal explosion, etc., the rubber is destroyed faster than any other part of the tank, releasing the pressure inside the tank and minimizing disasters. A shell hatch, or hatch that acts as a safety valve, is required.

Conventionally, as shown in FIGS. 1 and 2A, a cylindrical hatch coaming 4 is provided around the hatch 3 of the deck 2 of the crude oil storage tank 1 moored and floated on the ocean, When the end plate 5 which curves downward is fillet welded to the inner wall surface of the hatch coaming 4, and the pressure inside the tank 1 rises above a predetermined pressure, the buckling of the end plate 5 will produce a bending load on the welded part 6. There are some that are designed to at least break.

However, with such a structure, when the pressure in the tank 1 reaches a predetermined level or higher, the end plate 5 does not buckle as a whole as shown in FIG. There is a possibility that only the central portion will buckle, and the welded portion 6 will not be subjected to bending load and will not break.

The purpose of the present invention is to obtain a love hatch that has a simple structure and eliminates these drawbacks.

The love hatch of the present invention consists of a frame plate that is installed in the inner peripheral direction of the hatch coaming of the tank and slopes downward, and a mirror plate that is welded with the outer circumferential edge superimposed on the inner circumferential edge of the frame plate and curves downward. The hatch is closed, and examples thereof will be described below based on the drawings.

In FIGS. 3 and 4, 12 is the hatch of the tank, 13 is the hatch of the deck 12, and 14 is a cylindrical hatch coaming provided on the deck 12 around the hatch 13.

A frame plate 17 is attached in the circumferential direction within the hatch coaming 14 by fillet welding.

16 is the welded portion. The frame plate 17 has a truncated spherical shape that slopes downward.

On the inner peripheral edge of this frame plate 17, a mirror plate 15 curved downward in a concentric spherical shape is overlapped and fillet welded at the outer peripheral edge, and the hatch 13 is completely closed.

Reference numeral 18 indicates a welded portion between the end plate 15 and the frame plate 17.

It is appropriate that the overlapping portion of the mirror plate 15 and frame plate 17 be made as narrow as possible.

According to the Loveture Hat of this invention, the normal fluctuating pressure inside the tank due to temperature changes, etc. is absorbed by the head plate that curves downward integrally with the frame plate, and if the pressure exceeds a predetermined level, the welds around the head plate will tear. When such a bending load is applied, the welded part will definitely break, the head plate will be blown off, and the pressure inside the tank will drop rapidly, causing the tank to lose its intended function.

Furthermore, the structure is simple and inexpensive, and no special maintenance is required.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the conventional example, Fig. 2A is a sectional view of the main part of Fig. 1, Fig. 2B is an explanatory view of the operation of Fig. 1, and Fig. 3 is a sectional view showing the embodiment of the present invention. , FIG. 4 is a plan view of FIG. 3. 13...Hatch, 14...Hatch coaming, 15...End plate, 17...Frame plate, 16.18...Welded part.

Claims (1)

[Scope of utility model registration request] A love charm in which a hatch is closed by a frame plate provided in the internal circumferential direction of the hatch coaming of a tank and inclined downward, and a mirror plate whose outer circumferential edge is overlapped and welded to the inner circumferential edge of the frame plate and curved downward. Hatsuchi.