CN201314454Y

CN201314454Y - Sealing device for manhole on inner end socket of low temperature storage tank

Info

Publication number: CN201314454Y
Application number: CNU2008202161563U
Authority: CN
Inventors: 项林兵
Original assignee: ZHANGJIAGANG HANZHONG SHENLENG TECHNOLOGY Co Ltd
Current assignee: Zhangjiagang Furui Cryogenic Technology Co. Ltd.
Priority date: 2008-11-17
Filing date: 2008-11-17
Publication date: 2009-09-23
Anticipated expiration: 2018-11-17

Abstract

The utility model discloses a sealing device for a manhole on the inner end socket of a low temperature storage tank, and the sealing device can reduce manufacturing cost and improve production efficiency. A flat plate is arranged inside the manhole, and the peripheral edge of the flat plate and the peripheral edge of the manhole are welded on an annular backing plate positioned on the inner side of the manhole. The sealing device provided by the utility model has simple structure, omits a manhole connecting pipe extending inside and reduces the construction difficulty, and the seams among the backing plate, the flat plate and the manhole is required to be detected only by coloring with 100% PT, thereby reducing manufacturing cost and improving production efficiency.

Description

The seal arrangement of the manhole on the low temperature storage tank inner head

Technical field

The utility model relates to the interior end socket of low-temperature storage tank, refers more particularly to the seal arrangement of the manhole on the low temperature storage tank inner head.

Background technique

At present, low-temperature storage tank all adopts two cylindrical structures, comprise: the stainless steel inner container and the carbon steel shell of storing cryogenic fluids (as liquid oxygen, liquid nitrogen, liquid argon, LNG Liquefied natural gas etc.), the interlayer domestic demand of inner container and shell adds thermoinsulation material, and interlayer is vacuumized to reach best insulation effect.As everyone knows, in making the inner container process, need carry out every non-destructive inspection, to guarantee the sealability of inner container, wherein: the check one that inner container finally closes up seam is directly subordinate to the comparison stubborn problem.As shown in Figure 1,, on interior end socket 2, open manhole usually, set up the seal arrangement of manhole then manhole is sealed for the ease of the check that inner barrel in the inner container 1 and interior end socket 2 finally close up seam; Present common way is: stretch manhole and take over 3 in the manhole place increases, the workmen enters in the inner container from interior stretching the manhole adapter 3, after end socket 2 closes up seam with inner barrel 1 in having welded, carry out the 100%RT radiographic inspection, then, the workmen from stretch manhole and take in 3 and climb out of, weld again built-in manhole end socket 4 with in stretch manhole and take over 3 the seam that closes up, this closes up seam and carries out the painted detection of 100%PT.The shortcoming of this seal arrangement is: need the manhole place on the interior end socket 2 increase with manhole be sealedly and fixedly connected in stretch manhole and take over 3, its structure more complicated has not only increased manufacture cost, but also has reduced manufacturing efficiency.

The model utility content

A technical problem to be solved in the utility model is: the seal arrangement that the manhole on a kind of low temperature storage tank inner head that reduces manufacture cost, enhances productivity is provided.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is: the seal arrangement of the manhole on the low temperature storage tank inner head, be provided with one flat plate in manhole, the periphery edge of this piece flat board and the periphery edge of manhole are welded on the backing plate of the ring-type that is positioned at the manhole inboard.

Leave the slit between described flat board and the manhole, and in its relative face of weld, one side is the inclined-plane at least, the cross section of the weld seam that welding forms is wide at the top and narrow at the bottom.

The beneficial effects of the utility model are: sealing device structure described in the utility model is simple, stretch manhole in having saved and take over, reduced difficulty of construction, and the seam that closes up of backing plate, flat board and manhole also only needs the painted detection of 100%PT, thereby reduced manufacture cost, improved manufacturing efficiency.

Description of drawings

Fig. 1 is the structural representation of the seal arrangement of manhole described in the background technique;

Among the figure: 1, inner barrel, 2, interior end socket, 3, in stretch manhole and take over, 4, built-in manhole end socket.

Fig. 2 is the structural representation of the seal arrangement of manhole described in the utility model;

Fig. 3 is the structure for amplifying schematic representation of A part among Fig. 2;

Among Fig. 2 to Fig. 3: 2, interior end socket, 3, flat board, 4, backing plate, 5, weld seam.

Embodiment

Below in conjunction with accompanying drawing, describe specific embodiments of the present utility model in detail.

As shown in Figure 2, the seal arrangement of the manhole on the low temperature storage tank inner head described in the utility model, in the manhole of interior end socket 2, be provided with one flat plate 3, leave the slit between flat board 3 and the manhole, and in its relative face of weld, face of weld on the interior end socket 2 is the inclined-plane, and the periphery edge of this piece flat board 1 and the periphery edge of manhole are welded on the backing plate 4 of the ring-type that is positioned at the manhole inboard, and the cross section of the weld seam 5 that welding forms is wide at the top and narrow at the bottom---its structure is referring to shown in Figure 3.

Claims

1. the seal arrangement of the manhole on the low temperature storage tank inner head, it is characterized in that: be provided with one flat plate in manhole, the periphery edge of this piece flat board and the periphery edge of manhole are welded on the backing plate of the ring-type that is positioned at the manhole inboard.

2. the seal arrangement of manhole as claimed in claim 1 is characterized in that: leave the slit between described flat board and the manhole, and in its relative face of weld, one side be the inclined-plane at least, the cross section of the weld seam of welding formation is wide at the top and narrow at the bottom.