JPS5911915Y2 - Rapture hatch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a love hatch in an offshore oil storage tank, etc., which promptly ruptures to release the internal pressure when the tank internal pressure rises above a predetermined pressure, thereby preventing disasters.

Some conventional rupture hatches have an outer cover attached to the top opening of the hatch coaming to protect the inner cover, which is stretched inside the tank hatch coaming so that it ruptures at a certain internal pressure, from sunlight and rainwater. .

This outer cover simply rests on the hatch coaming or can be opened and closed on hinges.

However, the outer cover has a hatch diameter of 2.5 m and an outer cover plate thickness of 3 m.
m, it is about 120 kg, and if the diameter is 3.5 m, it is about 23 kg.
Since the rupture hatches are quite heavy at 0 kg, it would be difficult for a single person to do the work when the rupture hatches are opened for repairs or maintenance inspections, requiring the use of mechanical power such as a crane.Inspecting the hundreds of rupture hatches requires an enormous It takes time and money.

The present invention aims to eliminate these drawbacks and propose a rupture hatch in which the outer cover can be easily opened and closed by one person, and the outer cover can be easily blown off when the inner cover is broken.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The Loveture hatch of the present invention will be described below with reference to illustrative drawings.

1 is the deck of an offshore oil storage tank, 2 is an opening provided in the deck 1, and 3 is a cylindrical hatch coaming provided on the deck 1 surrounding the opening 2.

A flap plate 4 is provided on the inner circumference of the hatch coaming 3 and supports the circumferential side of a disc-shaped inner cover 6 reinforced with a stiffener 5.

The inner lid 6 has such rigidity that it will not deform even if a predetermined pressure is applied thereto.

Reference numeral 7 denotes a girder installed within the hatch coaming 3 below the inner cover 6, and the center portion of the inner cover 6 and the center portion of the girder 7 are connected with a support bolt 8.

The support bolts 8 are designed to withstand even when the inner lid 6 is subjected to normal fluctuating pressure within the tank, but to break when a load due to a predetermined internal pressure is applied.

A sealing agent 9 is filled between the inner lid 6 and the hatch coaming 3 to keep the inside of the tank airtight.

As the sealant 9, it is appropriate to use silicone rubber or the like which is highly water resistant, weather resistant, ozone resistant and heat resistant.

Reference numeral 10 denotes a beam installed at the upper end of the hatch coaming 3 across the center of the opening, and is connected to the hatch coaming 3 at both ends.
It engages with a recess 3a provided at the upper end of the holder and can be removed upwardly.

A bolt 11 is erected at the center of the beam 10.

12 is an outer cover placed on the opening of the hatch coaming 3.

The bolt 11 passes through the center of the outer cover 12 and is screwed into a nut 13 fixed to the center, and the outer cover 12 can be raised and lowered by rotating around the bolt 11 to open and close.

Grease is filled between the bolt 11 and the nut 13 to ensure smooth rotation of the outer cover 12 and to prevent rainwater from entering.

11a is a stopper provided at the upper end of the bolt 11 to prevent the outer cover 12 from coming off.

The bolt 11 is set at a height such that the working shell can enter the hatch coaming 3 when the outer cover 12 is raised and opened, as shown by the imaginary line in FIG.

The outer cover 12 has a peripheral wall 12a that fits on the outer periphery of the upper end of the hatch coaming 3 to prevent rainwater from entering.
2A is a handle for rotating the outer cover 12 provided in plural pieces.

Note that when opening the outer cover 12, the outer cover 12 is raised and separated from the hatch coaming 3, and the beam 10 is screwed onto the hatch coaming 3, or a cross-shaped beam is used to prevent the bolts 11 from falling. You can also.

If screwed, be sure to remove the screws after work.

According to the Loveture hatch of the present invention, by rotating the outer cover around the bolt that is threaded through the center of the outer cover,
The hatch coaming can be easily opened and closed by a single worker without the need for mechanical power, making maintenance inspection and repair inside the hatch coaming extremely easy.

Additionally, when the tank reaches a certain internal pressure, the inner cover breaks and is blown upwards, and at the same time, the internal pressure acts on the outer cover, allowing the beams supporting the outer cover to detach upwards via bolts. Therefore, the bolt and beam will be blown upwards, and the internal pressure of the tank will be reliably released.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a partially cutaway plan view of FIG. 1. 3... Hatch coaming, 3a... Recess, 6... Inner cover, 7... Girder, 8...
...Support bolt, 10...Beam, 11...
... Bolt, 12 ... Outer cover, 13 ...
··nut.

Claims (1)

[Scope of utility model registration request] A beam that crosses the center of the opening is installed at the upper end of the cylindrical hatch coaming, which is stretched inside the inner lid so that it can be broken at a predetermined internal pressure, so as to be removable upwards, and a bolt is installed upright in the center of this beam. , a rupture hatch made by fitting the outer cover of the hatch coaming to this bolt at the central penetration part so that it can rotate and move up and down.