JPH1082494A - Liquid receiving device for low temperature liquefied gas piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To positively receive low temperature liquefied gas in case of leaking from piping so as to prevent it from leaking in a liquid state to the outside. SOLUTION: Piping 1 is covered with a cold insulator 2. A semi-cylindrial liquid receiving gutter 9 with clamping pieces 8 projecting at both side parts is arranged at the peripheral lower half part of the cold insulator 2. A cold reserving cover 11 formed in the same shape as the liquid receiving gutter 9 and having clamping pieces 10 is arranged at the peripheral upper half part of the cold insulator 2. The clamping pieces 8, 10 are clamped by a bolt 12 so as to hold a clearance S between both pieces 8, 10, and low temperature liquefied gas leaking from the piping 1 is blown off in the gasified state from the clearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid receiving device for receiving liquid at the time of liquid leakage from a low-temperature liquefied gas pipe.

[0002]

2. Description of the Related Art When low-temperature liquefied gas such as LNG and LPG is transported by a transport ship, it is received at a land-based receiving terminal. However, land-based receiving is carried out from a pier to a land-based receiving terminal. This is performed through a low-temperature liquefied gas pipe. In this case, the low-temperature liquefied gas pipe may be horizontally arranged on a flat bridge that connects the quay and the adjacent offshore structure with the waterway interposed. Liquid receiving pans are installed so that even if there is a leak, the pipe supporting frame is not adversely affected and the water does not flow down on a ship passing under the bridge.

FIGS. 3 (a) and 3 (b) show a liquid receiving pan of a conventional low-temperature liquefied gas pipe, in which the length is, for example, about 1 m outside the pipe 1 whose outer periphery is covered with a cooling material 2. FIG. A cold insulation cover 3 made of a thin-walled cold insulation sheet metal is disposed so as to cover the cold insulation material 2, a liquid receiving pan 7 is provided below the cold insulation cover 3, and the pipe 1 is placed on a support frame 6. At the position to be supported, a part of the cold insulating material 2 located at the lower part of the pipe 1 is removed, a support block 4 made of high-quality urethane is incorporated into the part, and the cold insulating cover 3 is placed under the support block 4. SUS low temperature support through 5
So that the low-temperature support 5 is placed on the support frame 6, and the liquid receiving pan 7 is set on the support frame 6. If liquid leaks from the pipe 1, a cold insulation cover made of sheet metal is provided. Reference numeral 3 denotes a case in which the leaked liquid is received by the liquid receiving pan 7 so as not to flow down due to breakage due to contact with the low-temperature liquid, so that the low-temperature liquid does not adversely affect the supporting frame 6 and the like. It is.

[0004]

However, in the case of the prior art in which the liquid receiving pan 7 receives leaked liquid, FIG.
In the non-support portion of the pipe 1 as shown in (a), the liquid receiving pan 7 can be arranged as a simple shape because there is no obstacle. However, in the support portion of the pipe 1 as shown in FIG. In addition, since the low-temperature support 5 exists as an obstacle, the liquid receiving pan 7 must be installed to avoid the obstacle, and there is a problem that the liquid receiving pan 7 has a complicated shape. Further, as described above, the pipe 1 is laid in a horizontal state in a portion passing over a bridge over a waterway or the like, and the liquid receiving pan 7 is also in a horizontal state. There is also a problem.

Therefore, the present invention can respond to a simple shape regardless of the support portion and the non-support portion, and can reliably receive the low-temperature liquefied gas even if the low-temperature liquefied gas leaks from the pipe. Leakage in the liquid state can be prevented, and it is possible to prevent occurrence of a situation in which rainwater accumulates in a portion receiving the low-temperature liquefied gas. It is an object of the present invention to provide a liquid receiving device for a low-temperature liquefied gas pipe which does not become weakened even when it comes into contact with the liquid.

[0006]

According to the present invention, in order to solve the above-mentioned problems, clamping pieces are projected on both sides in the circumferential direction outside a low-temperature liquefied gas pipe covered with a cold insulator. A semi-cylindrical liquid drain gutter made of low temperature material and a cold insulation cover made of sheet metal,
The liquid receiving gutter is arranged in the lower half of the pipe, and the cold insulation cover is arranged so as to be located in the upper half of the piping, respectively, and the fastening piece of the liquid receiving gutter and the fastening piece of the cold insulating cover are provided. It is configured to be fixed by tightening with a bolt so that a gap is formed and held between the two.

[0007] Even if the low-temperature liquefied gas leaks from the pipe, the leaked low-temperature liquefied gas is received by the liquid receiving gutter, where it is vaporized and passes through the gap between the fastening pieces to the atmosphere. , Leakage to the outside in a liquid state is prevented.

[0008] Further, the cooling material located at the support portion of the pipe is partially removed, a support block is incorporated into the portion, and a support frame is provided below the support block via the cooling support with a liquid receiving gutter interposed therebetween. With the configuration in which the liquid receiving gutter is placed on the upper part, it is not necessary to form the liquid receiving gutter in the support part in a complicated shape.

Further, by providing a configuration in which a rainwater discharge pipe is connected to a required position at the bottom of the liquid receiving gutter, even if rainwater enters, it can be easily discharged through the rainwater discharge pipe.

[0010] Further, when the fastening piece of the liquid receiving gutter and the fastening piece of the cold insulation cover are configured to be bent downward,
It becomes possible to prevent infiltration of rainwater.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 (a), 1 (b) and 1 (c) show an embodiment of the present invention, in which a low temperature liquefied gas pipe 1 has a semi-cylindrical shape in which a cooling material 2 is coated on the outer periphery. A liquid receiving gutter 9 made of SUS, which is formed and has fastening pieces 8 horizontally extended on both sides in the circumferential direction, is arranged outside the cold insulator 2 so as to be along the lower half of the entire length of the pipe 1. In addition, a heat insulating cover 11 made of a thin-walled heat insulating sheet metal, which is similarly formed into a semi-cylindrical shape and has fastening pieces 10 horizontally projecting from both sides in the circumferential direction.
Are arranged outside the cold insulator 2 so as to be along the upper half of the entire length of the pipe 1, so that the liquid receiving gutter 9 and the cold insulator 11 surround the cold insulator 2 and oppose each other. The pieces 8 and 10 are fastened and fixed with bolts 12 so that a required gap S is formed and held between the pieces, and the low-temperature liquefied gas leaking from the pipe 1 is received by the liquid receiving gutter 9 where it is vaporized. Then, the air is released to the atmosphere through the gap S between the fastening pieces 8 and 10.

A rainwater discharge pipe 14 provided with a valve 13 is connected to a required portion at the bottom of the liquid receiving gutter 9 to discharge rainwater when rainwater enters through a gap S between the fastening pieces 8 and 10. Allow to drain through tube 14.

Further, as shown in FIG.
In the support portion, a part of the heat insulating material 2 located at the lower part of the pipe 1 is removed, and a support block 4 made of high-quality urethane is incorporated into the part, and the support block A SUS cold insulation support 5 is fixed below the liquid receiving gutter 9, and the cold insulation support 5 is placed on the support frame 6.

When a low-temperature liquefied gas leaks from the pipe 1 while the low-temperature liquefied gas is flowing through the pipe 1, it is detected by the leak sensor. Is stopped. On the other hand, the low-temperature liquefied gas that has already leaked is received by the liquid receiving gutter 9, but there is a gap S between the fastening piece 8 of the liquid receiving gutter 9 and the fastening piece 10 of the cool insulation cover 11. Is formed, the low-temperature liquefied gas is naturally vaporized and released to the atmosphere through the gap S. Therefore, the leaked low-temperature liquefied gas does not leak to the outside in a liquid state, and does not adversely affect the support frame and the like.

The gap S may be very small and it is difficult for rainwater to penetrate. However, when the wind is strong, there is a possibility that rainwater may enter through the gap S due to horizontal rain. Even if it does, the rainwater is naturally discharged through the rainwater discharge pipe 14 by opening the valve 13 of the rainwater discharge pipe 14 periodically. Therefore, there is no possibility that rainwater stays.

In the above, since the shape of the liquid receiving gutter 9 does not need to be changed between the support portion and the non-support portion, the shape of the liquid receiving gutter 9 is not complicated at the support portion unlike the conventional liquid receiving pan 7. Further, since the liquid receiving gutter 9 uses SUS as a low-temperature material, even if it comes into contact with the leaked low-temperature liquefied gas, it is not weakened and can be used for a long time.

Next, FIGS. 2A and 2B show another embodiment of the present invention. In the same configuration as shown in FIGS. 1A, 1B, and 1C, they are opposed to each other. The fastening piece 8 of the liquid receiving gutter 9 and the fastening piece 10 of the cold insulation cover 11 are bent obliquely downward.

With the arrangement shown in FIGS. 2A and 2B, it is possible to prevent intrusion from the gap S even if the rain is horizontal, and the rainwater discharge pipe 14 becomes unnecessary.

In the above-described embodiment, the liquid receiving gutter 9 is connected to the S
Although the case of US is shown, it is needless to say that other low-temperature materials may be used, and various changes may be made without departing from the scope of the present invention.

[0021]

As described above, the liquid receiving apparatus for a low-temperature liquefied gas pipe according to the present invention exhibits the following excellent effects. (1) A semi-cylindrical liquid receiving gutter made of a low-temperature material and a sheet-metal cold insulation cover with fastening pieces projecting from both sides in the circumferential direction outside the low-temperature liquefied gas pipe covered with the cold insulating material. Are arranged so that the liquid receiving gutter is located in the lower half of the pipe, and the cold insulation cover is located in the upper half of the piping, respectively. Is fixed by tightening with bolts so that a gap is formed between them, so even if the low-temperature liquid leaks from the piping,
Since the liquid can be reliably received by the liquid receiving gutter and released to the atmosphere in a vaporized state from the gap between the fastening pieces, it is possible to prevent the liquid from leaking to the outside in a liquid state. Since the gutter is made of a low-temperature material, even if it comes into contact with a low-temperature liquefied gas, it is not weakened and can withstand long-term use. (2) The cooling material located at the support portion of the pipe is partially removed, and a support block is incorporated into that portion, and the support block is provided on the lower part of the support block with the liquid receiving gutter interposed therebetween through the cooling insulating support. By adopting a configuration in which the liquid receiving gutter is placed, it is not necessary to change the shape of the liquid receiving gutter between the support portion and the non-support portion, and the shape of the support portion is not complicated. (3) By connecting the rainwater discharge pipe to the bottom of the liquid receiving gutter at a required position, the rainwater discharge pipe can be used even if the horizontal rain can enter through the gap between the fastening pieces. Rainwater can be drained naturally through (4) By forming the fastening piece of the facing liquid receiving gutter and the fastening piece of the cold insulation cover downward, even if it is raining sideways, Intrusion can be prevented.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a liquid receiving apparatus for a low-temperature liquefied gas pipe according to the present invention, in which (a) is a side view of a support portion,
(B) is a sectional view of a general portion (non-support portion), and (C) is a sectional view of a support portion.

FIG. 2 shows another embodiment of the present invention.
Is a sectional view of a general part, and (b) is a sectional view of a support part.

FIG. 3 shows an example of a low-temperature liquefied gas pipe.
Is a sectional view of a general part, and (b) is a sectional view of a support part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piping 2 Cold insulator 4 Support block 5 Low-temperature support 6 Supporting frame 8 Clamping piece 9 Liquid receiving gutter 10 Clamping piece 11 Cooling cover 12 Bolt S Clearance

Claims (4)

[Claims] 1. A semi-cylindrical liquid receiving gutter made of a low-temperature material and a cold insulator made of a sheet metal, in which fastening pieces project from both sides in the circumferential direction outside a low-temperature liquefied gas pipe covered with a cold insulating material. With the cover,
The liquid receiving gutter is arranged in the lower half of the pipe, and the cold insulation cover is arranged so as to be located in the upper half of the piping, respectively, and the fastening piece of the liquid receiving gutter and the fastening piece of the cold insulation cover are provided. A liquid receiving apparatus for a low-temperature liquefied gas pipe, wherein the liquid receiving apparatus has a structure in which the gap is formed between the two and fixed by fastening with a bolt. 2. A cooling block located at a support portion of a pipe is partially removed, a support block is incorporated into the portion, and a liquid receiving gutter is placed on a support frame via a low-temperature support. The liquid receiving device for a low-temperature liquefied gas pipe according to claim 1. 3. The low-temperature liquefied gas pipe liquid receiving apparatus according to claim 1, wherein a rainwater discharge pipe is connected to a required position at the bottom of the liquid receiving gutter. 4. The liquid receiving apparatus for a low-temperature liquefied gas pipe according to claim 1, wherein the fastening piece of the liquid receiving gutter and the fastening piece of the cold insulation cover are bent downward.