JPH031792Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to ammonia test piping installed in a membrane-type low temperature tank for storing LNG, etc.

[Prior Art] In a membrane type low-temperature tank, an ammonia test is conducted after membrane welding, after a pressure test, and after a cooling test to check for leaks at the weld. This ammonia test requires ammonia encapsulation piping that leads and seals ammonia from the outside of the tank to the encapsulation location on the back side of the membrane, and ammonia detection piping that communicates with the ammonia detection location on the back side of the membrane to detect the ammonia concentration in that area. used.

By the way, in the ammonia filling pipe mentioned above,
Conventionally, the supply pipe for supplying ammonia to the circumferential encapsulation tube section piped to the encapsulation point was routed in vertical corrugations on the sides of the membrane and in radial corrugations at the bottom of the membrane. There was a problem that measures against heat shrinkage at low temperatures were required. In addition, conventionally, a hole was drilled in the membrane for each ammonia test, and the ammonia detection piping was inserted into this hole from the front side of the membrane to communicate with the ammonia detection point on the back side of the membrane. There was a problem that it was inefficient as it had to be filled in.

[Purpose of the invention] The present invention solves the above-mentioned problems in the ammonia sealing piping and ammonia detection piping used for ammonia testing in membrane-type low temperature tanks, and reduces the number of parts that require heat shrinkage measures at low temperatures. This was done in order to provide ammonia test piping for a membrane-type cryogenic tank that does not require drilling holes for detection and can be used as permanent equipment.

[Structure of the invention] In order to achieve the above object, the present invention provides a membrane-type cryogenic tank in which a cold insulator and a membrane are successively provided inside the frame, and an ammonia-filled pipe extending along the back surface in the circumferential direction of the membrane and the back surface of the bottom surface of the membrane. An ammonia supply pipe leading to an ammonia sealing tube extending concentrically with the membrane, and a detection tube leading to an ammonia detection point on the back side of the membrane are each buried in the frame up to the vicinity of the sealing tube and the detection point.

[Example] Embodiments of the present invention will be described below based on the drawings.

1 is a membrane-type low temperature tank in which a cold insulating material 3 and a membrane 4 are sequentially installed inside a frame 2; 5 is an ammonia-filled area on the back side of the top, side, and bottom of the membrane 4 (in the circumferential direction at the side and bottom); The ammonia supply pipe 7 that supplies ammonia to the enclosure tube 5 extends from the pipe inlet of the building body 2 to the vicinity of the enclosure tube 5. 2, and finally penetrates the cold insulating material 3 and connects to the enclosing tube 5.

A detection tube 9 communicating with a point 8 for detecting ammonia flowing out from holes provided at appropriate pitches in the enclosure tube 5 is buried in the body 2 from the pipe inlet of the body 2 to the vicinity of the detection point 8.

With the above configuration, the ammonia supply pipe 7 and the detection pipe 9 are not affected by low temperatures due to the double insulation effect of the cold insulation material 3 and the frame 2, so there is no need to take heat shrinkage measures and they can be used as permanent equipment. can.

[Effects of the invention] As described above, according to the invention, (i) the ammonia supply pipe is buried in the structure up to the vicinity of the encapsulation tube, and there is no need to take measures against heat shrinkage at low temperatures except for the encapsulation tube, so it is easy and (ii) Since the detection tube is embedded in the structure and the gas concentration at the detection point is detected from the side of the structure, there is no need to provide a detection hole in the membrane. (iii) Permanent. It can be used as a piece of equipment, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is an overall view showing an embodiment of the present invention, Fig. 2 is a cross-sectional view showing a part of the ammonia sealing piping in the present invention, and Fig. 3 is a cross-sectional view showing a part of the ammonia detection piping in the present invention. It is a diagram. 2 is a frame, 3 is a cold insulation material, 4 is a membrane, 5 is an enclosure tube, 7 is an ammonia supply pipe, 8 is a detection point,
9 indicates a detection tube.

Claims (1)

[Scope of utility model registration request] In a membrane-type low temperature tank that has a cold insulator and a membrane inside the frame, an ammonia supply pipe that extends along the circumferential back surface of the membrane, an ammonia supply pipe that leads to the ammonia fill tube that extends concentrically to the back surface of the bottom surface of the membrane, and the membrane. Ammonia test piping for a membrane type low temperature tank, characterized in that a detection tube leading to an ammonia detection point on the back side is buried in the frame up to the vicinity of the sealed tube and the detection point, respectively.