JPS62177395A - Surge-pressure shock absorber - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a surge pressure damping device in a fluid transportation facility.

[Prior art]

Fluid transport facilities in general, e.g. land? In a transportation system in which oil is transported by connecting a tanker anchored offshore with a transportation line consisting of a pipeline, offshore buoy, marine hose line, etc., the most vulnerable part is the , a flexible hose that forms part of the above transportation line.

Closing of system valves, for example, sudden operational shutdown of oil loading due to an emergency such as a tanker fire or explosion, may cause pressures in such hoses to exceed the maximum allowable pressure.

In other words, if a tanker valve is suddenly closed due to a fire or valve operation error while oil is being transported by a pump on land, high surge pressure (temporary change in pressure, imbalance) may occur.
will occur. Figure 5 shows the pressure history for one hour to explain the generation of such surge pressure.
5 seconds), a very high surge pressure is generated.

When a very high surge pressure occurs as described above, the surge pressure wave generated at the valve on the tanker side propagates to the hose,
This can lead to damage to the hose, and if the hose is destroyed, oil can spill out into the ocean.

Therefore, in order to protect the integrity of the equipment, it is necessary to take surge protection measures, and for this reason, conventionally, offshore buoys themselves were equipped with surge protection devices, but this was not sufficient. .

[Purpose of the invention]

This invention has been made with the above-mentioned points in mind, and its purpose is to be able to easily incorporate it into a hose line that constitutes a part of a transportation line, to reduce damage to the hose due to surge pressure, and to reduce hose damage caused by surge pressure. The present invention provides a surge pressure buffer that can prevent contamination accidents caused by.

[Structure of the invention]

In order to achieve the above object, the present invention provides, in a transportation facility where a hose is used as a part of a fluid transportation line, a valve that is destroyed by surge pressure and a tank that stores the fluid that flows out when the valve is destroyed. The main point is that the following are established.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIGS. 1 and 2 are block diagrams of a surge pressure buffer according to an embodiment of the present invention, FIG. 3 is a partially enlarged view thereof, and FIG. 4 is an S B to which the present invention can be applied. M (Si
Figure 2 shows a diagram of the loading system of NGLE Buoy Mooring.

First, in FIG. 4, reference numeral 1 denotes a land pump installed on land, and this land pump 1 transports fluid, in the illustrated example oil.

The onshore pump 1 is connected to a PLF, M (pipeline end manifold) 4 on the ocean floor via an onshore pipeline 2 and an undersea pipeline 3. And this PL
The EM 4 and a buoy 6 floating on the sea surface 5 are connected by a submarine hose line 7, and the buoy 6 is connected to the EM 4 by a submarine hose line 7.
A floating hose line 9 and a till hose line 10 connect the tanker 8 and the tanker 8 moored on the sea.

In this way, a portion of the transport line is constructed not from a pipeline but from a marine hose.

The surge pressure buffer device having the structure shown in FIGS. 1 to 3 is installed at any position on the floating line of such a marine hose and is incorporated into the marine hose line. That is, this surge pressure buffer device includes a first
As shown in the figure, connection parts 11 with marine hoses are formed on both sides, and an opening 13 is formed in the pipe 12 between the two connection parts 11 and 11. Loveture disk (destruction plate) 14 to
is provided.

This lubrication disk 14 constitutes a valve that is destroyed by surge pressure.

Furthermore, as shown in FIGS. 1 and 2, the surge pressure damping device is equipped with a tank 15 for storing oil that flows out when the lubrication disk 14 constituting the valve is destroyed. Under normal conditions, this tank 15 prevents oil from flowing into the tank 15 using a lubricant disk 14, and prevents oil from flowing into the tank 15 by sensing pressure waves caused by surge phenomena. The compressive elasticity of the material reduces surge pressure.

In addition, when incorporating the surge pressure buffer device constituted by the lubrication disk 14 and the tank 15 for buffering surge pressure as described above, it is necessary to install one or more surge pressure buffer devices in the floating hose line 9 in FIG. Make sure to install them individually.

Next, the operation of the surge pressure buffer device incorporated into the floating hose line 9 will be explained.

If oil is currently being transported by the land pump 1, no oil will flow into the tank 15 under normal conditions since no bursting pressure is applied to the lubrication disk 14. Therefore, oil is normally transported without destroying the lubrication disk 14 of the surge pressure buffer built into the marine hose line.

Next, suppose that the valve of the tanker 8 suddenly closes due to a fire or a valve operation error while transporting oil. In the case of sudden closure like this, the surge pressure wave generated by the valve on the tanker side will propagate from the till hose line 10 to the floating hose line 9. Since it is installed,
When the surge pressure wave reaches the Lubutture disk 14 of the surge pressure buffer, the surge pressure wave breaks the Lubutture disk 14, and the oil flows into the tank 15, thereby attenuating the surge pressure wave. That is, due to the oil flowing into the tank 15 and the compressive elasticity of the air inside the tank 15,
Surge pressure can be reduced.

In this way, surge pressure can be reduced by a device built into the marine hose line, reducing damage to the marine hose due to surge pressure and preventing oil from leaking into the sea due to marine hose destruction. I can do it.

In addition, this surge pressure buffer can be easily installed at any position on the floating line of a marine hose, and if multiple surge pressure buffers are installed, these surge pressure buffers will work one after another to prevent surge pressure waves. It can be attenuated.

Note that the bursting pressure of the rupture disk 14 can be set depending on the transportation line system to which it is applied. In other words, the pressure should be set to a value that does not break during normal operation, but will break in response to a surge pressure wave and protect the hose.For example, it may be set to about 1.5 times the rated pressure of the hose. This is desirable.

〔Effect of the invention〕

In a transportation facility that uses a hose as a part of a fluid transportation line as described above, the present invention provides a hose line that uses the hose with a valve that is destroyed by surge pressure and a tank that stores the fluid that flows out when the valve is destroyed. As a result of this provision, it is possible to buffer surge pressure and reduce the surge pressure even if the operation is abruptly shut down, thus reducing damage to the hose due to surge pressure and preventing contamination due to fluid leakage to the outside. In addition to this, it also has the advantage that it can be easily incorporated into a hose line, and multiple pieces can be attached as necessary.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a surge pressure buffer according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line A-A' in Fig.
FIG. 4 is a block diagram of a fluid transport line to which the present invention can be applied, and FIG. 5 is a diagram showing a one-hour pressure history for explaining the present invention. be. 6...Buoy, 7...Submarine hose line, 9.
...Floating hose line, 10...Till horse line, 14...Loveture disc, 15...
·tank. Figure 4Figure 1

Claims (1)

[Claims] In a transportation facility that uses a hose as part of a fluid transportation line, the hose line that uses the hose is provided with a valve that is destroyed by surge pressure and a tank that stores the fluid that flows out when the valve is destroyed. Pressure buffer.