JPH0223600Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application]
The present invention relates to an emergency disconnection section of a fluid cargo handling device that disconnects and freely connects a transport pipe on the fluid cargo handling device side and a transport pipe on the ship side to each other.

[Conventional technology]

For example, when unloading oil from an oil tanker docked at a sea berth to an onshore storage tank, or when loading oil from a storage tank onto an oil tanker, fluid handling equipment may be affected by strong winds, waves, etc. If the movement of the pipe becomes large, if left unchecked, the transport pipe will break and cause major damage. Therefore, the transport pipe is equipped with an emergency disconnection device and a shutoff device, and after the transport pipe is closed by the shutoff device, An emergency disconnection device is activated to disconnect the transport pipe, preventing oil and other transport fluids from leaking out and preventing the transport pipe from being destroyed.

The conventional emergency disconnection section of a fluid cargo handling device connects flanges provided at the pipe ends of a transport pipe on the fluid cargo handling equipment side equipped with a cutoff valve and a transport pipe on the ship side equipped with a cutoff valve to connect the two above-mentioned shutoffs. The valves are connected to each other in a manner that allows them to be disconnected by an emergency disconnection device at an intermediate position of the valve.

[Problem that the invention attempts to solve]

However, even when the two shutoff valves are closed, the transport liquid remains in the transport pipe between the two shutoff valves, and this poses a problem of the residual transport liquid flowing out to the outside.

In other words, the transport pipe on the ship's side, which is located on the lower side, is supported almost vertically by the stopper with the opening facing upward, so the transported liquid does not leak out to the outside, but the transport pipe on the upper side Since the transport pipe on the side of the fluid cargo handling equipment where it is located has its opening facing downward, a large amount of residual transport liquid (approximately 1/2 of the total remaining transport liquid)
However, there are inconveniences such as it flowing out to the outside and contaminating the ship's equipment, and flowing into the sea and contaminating seawater.

In order to prevent this, a system has been proposed in which the shutoff valve is closed and the remaining transport liquid is pushed out through a dedicated passage to the outside using pressure gas such as nitrogen gas, and the transport pipe is separated. Since the amount of residual transport liquid to be treated is large, it takes time to discharge the residual transport liquid, which causes a problem in that the disconnection of the transport pipe is delayed and the urgency is impaired.

[Means for solving problems]

The present invention provides an emergency disconnection device in which a first transport pipe provided with a cutoff valve located on the upper side and a second transport pipe provided with a cutoff valve located on the lower side are connected to flanges provided at the ends of each pipe. In the emergency disconnection part of the fluid cargo handling device mutually joined by, the two flanges are provided so that the distance between the axes of the two cutoff valves is closer to the cutoff valve of the first transport pipe from the center position, This solves the above-mentioned conventional problems.

[Effect]

When transporting transport pipes, as in the past, for example, the first transport pipe on the side of the fluid cargo handling equipment and the second transport pipe on the ship side are joined by flanges provided at the ends of these pipes using an emergency disconnection device. The two shutoff valves provided in the transport pipe are opened to transport the transport liquid.

An emergency situation occurs during transport of liquid,
When it becomes necessary to disconnect the transport pipe, the shutoff valve is closed, and then the emergency disconnection device is activated to disconnect the two joined flanges. At this time, the residual transport liquid in the upper first transport pipe with the opening facing downward flows out, but since the flange of the disconnection part is close to the shutoff valve of the first transport pipe, a small amount of transport liquid Since only the remaining liquid remains, the damage caused by the spilled transport liquid is minimized to a negligible level.

In addition, if the remaining transport liquid is forcibly discharged using pressurized gas, the damage caused by the spilled transport liquid will be eliminated, and the time for draining it will be shortened, allowing the transport pipe to be cut off urgently. .

〔Example〕

1 to 3 show an embodiment of the present invention, and reference numeral 1 indicates a transport pipe (first transport pipe) on the side of the fluid cargo handling device (not shown) located on the upper side;
A flange 2 is provided at the end of the tube, and a cutoff valve 3 made of a butterfly valve is provided at a distance l from the flange 2. Also, 4
is a transport pipe (second transport pipe) on the ship (not shown) side located below, and the flange 5 is provided at the end of the pipe in the same way as above, and the distance L is away from the flange 5. There is a shutoff valve 6 consisting of a butterfly valve.
is provided.

Here, the distance between the shafts of the two cutoff valves 3 and 6 (l+L) is determined by the opening and closing of the cutoff valves 3 and 6, or
It is set to the minimum interval necessary for installing the emergency disconnection device 7 described below, and l<(l+
L)/2, that is, l<L.

The emergency disconnection device 7 is connected to the flanges 2 and 5.
It connects the two transport pipes 1 and 4 by joining them, and includes three arc-shaped clampers 10, 11, 12 connected in an annular manner by connecting pins 8 and 9, and a free end of the clamper 12. The clampers 10, 11, 1 are attached to the clampers 10, 11, 1 by a mounting pin 13 and fitted into a receiver 14 provided at the free end of the other clamper 10.
A fastening rod 15 that maintains the fastened state of the fastening rod 15 is attached to a bracket 16 pivotally attached to the connecting pin 8 by a pivot 23, and a protrusion 15a of the fastening rod 15 is attached by a tip member 18 of the piston rod 17.
Press and tighten the clampers 10, 1 with the tightening rod 15.
Opening cylinder 19 for unfastening 1 and 12
and the mounting pin 13 is pivotally connected to the mounting pin 13.
The rotation of the fastening rod 15 about the pressure receiving part 20
a, press the clamper 12 with the pressing part 20b,
A rotating member 20 for forcibly separating the clamper 12 from the flanges 2 and 5.

Note that the fastening pin 8 of the emergency disconnection device 7 is
It is connected to a bolt 22 of a projecting piece 21 provided on the transport pipe 1 via links 24, 24. Reference numeral 25 denotes a shear pin that prevents the fastening rod 15 fitted into the receiver 14 from freely detaching.

Further, 26 is a closing device that operates the cutoff valves 3 and 6 to close the transport pipes 1 and 4, and includes a drive device 28 such as a hydraulic actuator directly connected to the shaft 27 of the cutoff valve 3, and a drive device 28 such as a hydraulic actuator that is directly connected to the shaft 27 of the cutoff valve 3. an operating lever 30 attached to the rotating shaft 29 of the shutoff valve 6;
The operating lever 32 attached to the operating lever 30 is bolted to the operating lever 30 by locking its tip to the protrusion 33 of the operating lever 32 (universal joint).
Two interlocking rods 3 on the left and right attached with 34
5, 35, and the drive device 28 operates,
When the shaft 27 of the shutoff valve 3 is rotated, the operating lever 3
0 rotates at the same time, and the shaft 31 of the other shutoff valve 6 is rotated via the interlocking rods 35, 35 and the operating lever 32, so that the two shutoff valves 3, 6 operate in conjunction with each other. has been done.

36 is a limit valve provided in the middle of the hydraulic piping to the opening cylinder 19, and is normally in a blocked state, and when the shutoff valves 3 and 6 are closed, the screw 37 provided on the operating lever 30 is closed. The piston of the limit valve 36 is pushed to operate the opening cylinder 19. That is, it constitutes an interlock mechanism that prevents the emergency disconnection device 7 from operating unless the cutoff valves 3 and 6 are closed. 38 is the flange 2 by the emergency disconnection device 7;
This is a tie rod that ties together the projecting pieces 21 and 39 of the transport pipes 1 and 4 to facilitate the fastening work of the emergency disconnection device 7 when joining the transport pipes 1 and 5, and is removed after the fastening work is completed.

FIG. 4 shows an example of discharging the residual transport liquid using a pressure gas such as nitrogen gas.
1 is attached, and its inner end opens into a connection space K surrounded by the transport pipes 1 and 4 and the valve bodies 3a and 6a of the shutoff valves 3 and 6. The valve bodies 3a, 6a are provided with discharge passages 3b, 6b which communicate the connection space K with other parts of the transport pipes 1, 4, and the discharge passages 3b, 6b are provided on the side of the connection space K. A check valve 42 that allows the transport liquid to flow freely from the transport pipes 1 and 4 to other parts of the transport pipes 1 and 4 and stops the flow of the transport liquid in the opposite direction.
43 are provided.

Next, the operation of the emergency disconnection section of the fluid cargo handling device according to the present invention configured as described above will be explained.

1 and 2 show the state in which the flanges 2 and 5 of the transport pipes 1 and 4 are joined by the emergency disconnection device 7. From this state, the tie rod 38 is removed and the two points shown in FIG. As shown by the chain line, the drive device 28 operates the shutoff valves 3 and 6 to close the transportation pipes 1 and 4.
Open it and transport the transport liquid.

During transport of liquid, if the ship is shaking too much due to waves or the like and it becomes necessary to disconnect the transport pipes 1 and 4, first drive the shutoff valves 3 and 6 of the two transport pipes 1 and 4. The device 28 is activated to close the transport pipes 1, 4. Next, when the opening cylinder 19 is extended, the fastening rod 15 is connected to the piston rod 1.
7, the shear pin 25 is cut and removed from the receiver 14, and the pressure receiving part 20a is pushed to rotate the rotating member 20 around the mounting pin 13, so that the pressing part 20b pushes the outer surface of the clamper 12. to forcibly remove the clamper 12 from the flanges 2 and 5. This allows the three clampers 1
0, 11, and 12 are completely removed from the flanges 2, 5, and the two transport pipes 1, 4 are separated.

At this time, transport pipe 4 on the ship side with the opening facing upward.
is supported almost vertically on a stopper (not shown) provided on the ship. Therefore, the transport liquid hardly flows out from the transport pipe 4. On the other hand, since the transport pipe 1 of the fluid cargo handling device has its opening facing downward, the transport liquid remaining in the transport pipe 1 from the shutoff valve 3 to the flange 2 flows out downward. As shown in the figure, since the distance l from the shutoff valve 3 to the flange 2 is shortened and the amount thereof is reduced, the damage caused by the outflow of the residual transport liquid can be suppressed to a negligible extent.

As shown in FIG. 4, when a pressurized gas injection pipe 41 is provided, as soon as the transportation pipes 1 and 4 are closed by the shutoff valves 3 and 6, the pressurized gas is immediately transferred from the pressurized gas injection pipe 41 to the connection space K. Press fit into. As a result, the remaining transport liquid in the connection space K is removed from the check valve 42,
43 and returned to the transport pipes 1, 4. When an amount of transport liquid corresponding to the volume between the shutoff valve 3 and the flange 2 of the upper transport pipe 1 is discharged, the emergency disconnection device 1 is operated in the same manner as described above, and the transport pipes 1 and 4 are separated.
At this time, since the remaining transport liquid on the transport pipe 1 side has already been sent, the transport liquid does not flow out to the outside at all.

In addition, in the present invention, the emergency disconnection device 7
The specific structures of the closing device 26 and the cutoff valves 3 and 6 are arbitrary. In addition, a pressure gas injection pipe 41
In the case where the transport liquid is provided in the transport pipe, the discharge passage for the transport liquid may be formed by a pipe 44 as shown by the two-dot chain line in FIG. The pipe 44 may be arranged to communicate the connection space K with a tank or the like. Fourth
In the case shown in the figure, the discharge passage 3b and the check valve 42 are not necessarily required. The pipe 44 is provided with a joint in the middle that can be disconnected when the emergency disconnection device 7 is activated, and the transport pipe 1
You can also connect to The press-fit pipe 40 is the transport pipe 4
may be connected to.

[Effect of idea]

As explained above, in the disconnection section of the fluid cargo handling device of the present invention, the two flanges that are joined to each other by the emergency disconnection device are connected to the upper shutoff valve from the center position of the distance between the axes of the two shutoff valves located above and below. Since the connection space of the first transport pipe, which is installed close to the valve and is provided with the opening facing downward, is small, the amount of residual transport liquid that flows out is small, and therefore, the amount of outflow is reduced. Damage caused by transported liquid can be minimized. Furthermore, if a pressure gas injection pipe is provided to discharge the residual transport liquid, the discharge operation time can be shortened, the transport pipe can be quickly disconnected, and accidents can be prevented.

[Brief explanation of drawings]

Figure 1 is a plan view of the emergency disconnection section of the present invention;
The figure is a front view with a portion of the flange cut away.
FIG. 3 is a side view, and FIG. 4 is a sectional view when a press-fit pipe is provided. 1...first transport pipe, 4...second transport pipe,
2, 5...Flange, 3,6...Shutoff valve, 3b,
6b...Discharge passage, 41...Press-fit pipe, K...
Connection space, l+L...distance between axes.

Claims (1)

[Scope of utility model registration request] a first transport pipe located on the upper side and having a shutoff valve;
A second transport pipe provided with a shutoff valve and located on the lower side,
In the emergency disconnection section of the fluid cargo handling device in which flanges provided at each pipe end are connected to each other by an emergency disconnection device, the two flanges are separated from the center position of the distance between the axes of the two shutoff valves to the first point. An emergency disconnection section of a fluid cargo handling device, characterized in that it is provided close to a cutoff valve of a transport pipe.