JP2004044975A - Fluid circulating device, its welded part examining method, air heating-type liquefied gas evaporator, and its welded part examining method - Google Patents

Fluid circulating device, its welded part examining method, air heating-type liquefied gas evaporator, and its welded part examining method Download PDF

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Publication number
JP2004044975A
JP2004044975A JP2002205693A JP2002205693A JP2004044975A JP 2004044975 A JP2004044975 A JP 2004044975A JP 2002205693 A JP2002205693 A JP 2002205693A JP 2002205693 A JP2002205693 A JP 2002205693A JP 2004044975 A JP2004044975 A JP 2004044975A
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Japan
Prior art keywords
liquefied gas
manifold
pipe
tube
air
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JP2002205693A
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Japanese (ja)
Inventor
Hiroshi Shioda
塩田　浩
Takayuki Watanabe
渡邉　貴之
Takashi Hirayama
平山　貴司
Masahiko Okamura
岡村　昌彦
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Osaka Gas Engineering Co Ltd
Resonac Holdings Corp
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Showa Denko KK
Osaka Gas Engineering Co Ltd
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Priority to JP2002205693A priority Critical patent/JP2004044975A/en
Publication of JP2004044975A publication Critical patent/JP2004044975A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/422—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element with outside means integral with the tubular element and inside means integral with the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0061—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for phase-change applications
    • F28D2021/0064—Vaporizers, e.g. evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2220/00—Closure means, e.g. end caps on header boxes or plugs on conduits

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air heating-type liquefied gas evaporator and its welded part examining method for examining a welded part from the inside even after the operation. <P>SOLUTION: This air heating-type liquefied gas evaporator comprises an evaporating part and a heating part. The evaporating part comprises an evaporation unit configurated by a pair of manifold pipes 7 arranged in parallel with each other at a vertical interval and a plurality of finned pipes 3 mounted between both manifold pipes 7 at an interval in the longitudinal direction of the manifold pipes, and connected to the manifold pipes 7 at their vertical both end parts. An opening of an end part at a side opposite to a liquefied gas inflow side end part, of the lower manifold pipe 7 is closed by a detachable closing member. The closing member is removed from the lower manifold pipe 7, and an endoscope 22 is inserted into the lower manifold pipe 7 from its one end opening to observe the welded part of the lower manifold pipe 7 and each finned pipe 8 from the inside. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、流体流通装置およびその溶接部検査方法、空温式液化ガス気化器およびその溶接部検査方法に関する。
【０００２】
この明細書において、図１の上下を上下というものとする。
【０００３】
【従来の技術と発明が解決しようとする課題】
たとえば天然ガス、酸素、窒素、アルゴン、ヘリウム、水素、炭酸ガス、メタン、プロパン、エチレンなどのガスは、輸送時や貯蔵時には、タンクの容量を小さくするために液化した状態で蓄えられている。そして、需要に応じて空温式液化ガス気化器により再ガス化され、使用されるようになっている。
【０００４】
従来、このような空温式液化ガス気化器としては、蒸発部および加温部を備えており、蒸発部が、上下方向に間隔をおいて互いに平行に配された１対のマニホルド管と、両マニホルド管間に配されかつ上下両端部がそれぞれ両マニホルド管に接続されたフィン付き管とよりなる蒸発ユニットを、マニホルド管およびフィン付き管と直交する方向に並列状に複数配置することにより構成されており、各蒸発ユニットの下マニホルド管内にその一端から流入した液化ガスが、全てのフィン付き管に分流した後フィン付き管を通って上マニホルド管内に流入し、上マニホルド管における下マニホルド管への流入端とは反対側の端部から加温部に流出するようになされたものが知られている（たとえば特開２０００−３９０９９号公報参照）。この空温式液化ガス気化器では、各蒸発ユニットにおける下マニホルド管内への流入側端部のフィン付き管の上端は、Ｌベンドを介して上マニホルド管に接続され、同じくこれとは反対側の端部のフィン付き管の下端は、Ｌベンドを介して下マニホルド管に接続されている。
【０００５】
このような空温式液化ガス気化器を、天然ガスなどの可燃性液化ガスの気化に用いる場合、洩れが発生してはならないので、製造後稼働前の段階で、耐圧テストを行って洩れの有無を調べている。
【０００６】
しかしながら、空温式液化ガス気化器の運転により液化ガスの気化を行うと、マニホルド管やフィン付き管が熱収縮および熱膨張を繰り返すことになるので、熱応力により溶接部に割れが発生するおそれがある。そこで、従来の空温式液化ガス気化器では、定期的に運転を停止し、液体探傷検査法により溶接部を外側から検査している。ところで、上記熱応力により、溶接部の内側に割れなどが発生している可能性もあるが、従来の空温式液化ガス気化器では、稼働後には耐圧テストを行うことができないので、稼働後は溶接部の内側の検査は実施されていないのが現状である。
【０００７】
この発明は上記実情に鑑みてなされたものであって、稼働後にも溶接部を内側から検査しうる流体流通装置およびその溶接部検査方法、空温式液化ガス気化器およびその溶接部検査方法を提供することを目的とする。
【０００８】
【課題を解決するための手段】
請求項１の発明による流体流通装置は、第１金属管の周壁に、少なくとも１本の第２金属管の一端部が連通状に溶接されている流体流通装置であって、第１金属管の少なくとも一端の開口が、着脱自在の閉鎖部材により閉鎖されているものである。
【０００９】
請求項１の発明の流体流通装置によれば、稼働後にも、運転を停止して閉鎖部材を第１金属管から取り外し、第１金属管内に、その一端開口から内視鏡を挿入し、第１金属管と第２金属管との溶接部を内側から観察することにより、溶接部の内側からの検査を実施することができる。
【００１０】
請求項２の発明による流体流通装置は、請求項１の発明において、閉鎖部材が、第１金属管の端部に固定状に設けられた外向きフランジに、シール部材を介して着脱自在に固定されためくらフランジからなるものである。
【００１１】
請求項３の発明による流体流通装置は、請求項１の発明において、閉鎖部材が、第１金属管の端部外周面に形成されたおねじ部に、シール部材を介してねじ嵌められためねじ部付きキャップからなるものである。
【００１２】
請求項４の発明による流体流通装置の溶接部検査方法は、請求項１〜３のうちのいずれかの流体流通装置において、閉鎖部材を第１金属管から取り外し、第１金属管内に、その一端開口から内視鏡を挿入し、第１金属管と第２金属管との溶接部を内側から観察することを特徴とするものである。
【００１３】
請求項４の発明の方法による検査は、流体流通装置の稼働後にも運転を停止して実施することができる。
【００１４】
請求項５の発明による空温式液化ガス気化器は、蒸発部および加温部を備えており、蒸発部が、上下方向に間隔をおいて互いに平行に配された１対のマニホルド管と、両マニホルド管間にマニホルド管の長さ方向に間隔をおいて配されかつ上下両端部がそれぞれ両マニホルド管に接続された複数のフィン付き管とよりなる蒸発ユニットを、マニホルド管およびフィン付き管と直交する方向に並列状に複数配置することにより構成されており、下マニホルド管内にその一端から流入した液化ガスが、全てのフィン付き管に分流した後フィン付き管を通って上マニホルド管内に流入し、上マニホルド管から加温部に流出するようになされた空温式液化ガス気化器において、下マニホルド管の液化ガス流入側端部と反対側の端部の開口が、着脱自在の閉鎖部材により閉鎖されているものである。
【００１５】
請求項５の発明の空温式液化ガス気化器によれば、稼働後にも、運転を停止して閉鎖部材を下マニホルド管から取り外し、下マニホルド管内に、その一端開口から内視鏡を挿入し、下マニホルド管とフィン付き管との溶接部を内側から観察することにより、溶接部の内側からの検査を実施することができる。
【００１６】
請求項６の発明による空温式液化ガス気化器は、請求項５の発明において、上マニホルド管の少なくとも一端の開口が、着脱自在の閉鎖部材により閉鎖されているものである。
【００１７】
請求項６の発明の空温式液化ガス気化器によれば、稼働後にも、運転を停止して閉鎖部材を上マニホルド管から取り外し、上マニホルド管内に、その一端開口から内視鏡を挿入し、上マニホルド管とフィン付き管との溶接部を内側から観察することにより、溶接部の内側からの検査を実施することができる。
【００１８】
請求項７の発明による空温式液化ガス気化器は、請求項５または６の発明において、閉鎖部材が、マニホルド管の端部に固定状に設けられた外向きフランジに、シール部材を介して着脱自在に固定されためくらフランジからなるものである。
【００１９】
請求項８の発明による空温式液化ガス気化器は、請求項５または６の発明において、閉鎖部材が、マニホルド管の端部外周面に形成されたおねじ部に、シール部材を介してねじ嵌められためねじ部付きキャップからなるものである。
【００２０】
請求項９の発明による空温式液化ガス気化器の溶接部検査方法は、請求項５〜８のうちのいずれかの空温式液化ガス気化器において、閉鎖部材を下マニホルド管から取り外し、下マニホルド管内に、その一端開口から内視鏡を挿入し、下マニホルド管とフィン付き管との溶接部を内側から観察することを特徴とするものである。
【００２１】
請求項１０の発明による空温式液化ガス気化器の溶接部検査方法は、請求項６〜８のうちのいずれかの空温式液化ガス気化器において、閉鎖部材を上マニホルド管から取り外し、上マニホルド管内に、その一端開口から内視鏡を挿入し、上マニホルド管とフィン付き管との溶接部を内側から観察することを特徴とするものである。
【００２２】
請求項９および１０の発明の方法による溶接部の内側からの観察は、空温式液化ガス気化器の稼働後にも運転を停止して実施することができる。
【００２３】
【発明の実施形態】
以下、この発明の実施形態を、図面を参照して説明する。
【００２４】
図１および図２は空温式液化ガス気化器の全体構成を示し、図３はその要部の構成を示す。なお、以下の説明において、図１の左右を左右といい、図２の下側を前、上側を後というものとする。また、以下の説明において、「アルミニウム」という用語には、純アルミニウムの他にアルミニウム合金を含むものとする。
【００２５】
図１および図２において、空温式液化ガス気化器（１）は、複数の蒸発ユニット（３）を前後方向に間隔をおいて並列状に配置してなる蒸発部（２）と、複数のフィン付き蛇行管（５）を前後方向に間隔をおいて並列状に配置してなる加温部（４）とを備えている。
【００２６】
蒸発ユニット（３）は、上下方向に間隔をおいて互いに平行に配されかつ左右方向に伸びる１対のアルミニウム製マニホルド管（６）（７）と、両マニホルド管（６）（７）間にマニホルド管（６）（７）の長さ方向（左右方向）に間隔をおいて配されかつ上下両端部がそれぞれ両マニホルド管（６）（７）に接続されたアルミニウム製フィン付き管（８）とよりなる。
【００２７】
蒸発ユニット（３）の上マニホルド管（６）の両端には外向きフランジ（６ａ）が固定されており、外向きフランジ（６ａ）に適当なシール材（図示略）を介してめくらフランジ（９）をボルトおよびナット（いずれも図示略）によって着脱自在に固定することにより、上マニホルド管（６）の両端開口が閉鎖されている。前側の半分の蒸発ユニット（３）における下マニホルド管（７）の左端、および後側の半分の蒸発ユニット（３）における下マニホルド管（７）の左端は、前後方向に間隔をおいて配されかつ前後方向に伸びる入口ヘッダ管（１１）に接続されている。入口ヘッダ管（１１）には分流管（１２）が接続されており、分流管（１２）の中央部に液化ガス入口（１３）が形成されている。下マニホルド管（７）の右端には外向きフランジ（７ａ）が固定されており、外向きフランジ（７ａ）に適当なシール材（図示略）を介してめくらフランジ（１４）をボルト（２０）およびナット（２１）によって着脱自在に固定することにより、下マニホルド管（７）の右端開口が閉鎖されている（図３参照）。
【００２８】
蒸発ユニット（３）のフィン付き管（８）は、たとえばアルミニウム押出形材からなるものであり、外周面に上下方向に伸びる複数のフィン（８ａ）が放射状に一体に形成され、内周面に上下方向に伸びる複数の凸条からなるインナーフィン（８ｂ）が周方向に間隔をおいて一体に形成されたものである（図３参照）。各蒸発ユニット（３）において、隣接するフィン付き管（８）のフィン（８ａ）は、上下両端部において連結部材（１５）により連結されている。連結部材（１５）は、熱の影響により上下マニホルド管（７）が長さ方向に伸縮した場合にこれを吸収しうるように、たとえば横断面Ｓ字状となされている。
【００２９】
加温部（４）は、各フィン付き蛇行管（５）を、前後方向に関して蒸発ユニット（３）と対応する位置に来るように、各蒸発ユニット（３）の右側に並列状に配置することにより構成されている。各フィン付き蛇行管（５）は、たとえば複数の直管状フィン付き管（１６）をＵベンド（１７）で接続することにより形成されている。直管状フィン付き管（１６）は、蒸発ユニット（３）のフィン付き管（８）と同様な構成であり、隣接する直管状フィン付き管（１６）のフィン（１６ａ）は、上下両端部において連結部材（１５）により連結されている。各フィン付き蛇行管（５）の一端は、各蒸発ユニット（３）の上マニホルド管（６）における右端のフィン付き管（８）よりも右方の部分に接続され、同じく他端は、加温部（４）の下方に配された前後方向に伸びる出口ヘッダ管（１８）に接続されている。出口ヘッダ管（１８）の中央部にガス出口（１９）が形成されている。
【００３０】
上記構成の空温式液化ガス気化器（１）において、貯蔵タンクに貯蔵されていた液化ガスは液化ガス入口（１３）から分流管（１２）を通して入口ヘッダ管（１１）内に送り込まれ、入口ヘッダ管（１１）を通って各蒸発ユニット（３）の下マニホルド管（７）内に流入する。下マニホルド管（７）内に流入した液化ガスは全てのフィン付き管（８）に分流し、フィン付き管（８）内を上方に流れる間に、大気と熱交換して再ガス化する。ガスは、上マニホルド管（６）を経て温部（４）のフィン付き蛇行管（５）に流入し、フィン付き蛇行管（５）内を流れる間に、大気と熱交換して所定温度、たとえば０℃以上に加温される。加温されたガスは出口ヘッダ管（１８）内に流入し、ガス出口（１９）から送り出される。
【００３１】
このような空温式液化ガス気化器（１）によれば、稼働後には、各蒸発ユニット（３）における上下両マニホルド管（６）（７）とフィン付き管（８）との溶接部の内側の検査が、次のようにして行われる。
【００３２】
まず、空温式液化ガス気化器（１）の運転を停止した後、図３に示すように、下マニホルド管（７）の外向きフランジ（７ａ）からめくらフランジ（１４）を取り外す。その後、下マニホルド管（７）内に、その右端開口から内視鏡（２２）を挿入し、下マニホルド管（７）とフィン付き管（８）との溶接部を内側から観察する。こうして、溶接部内側の検査が行われる。
【００３３】
上マニホルド管（６）とフィン付き管（８）の溶接部内側の検査もこれと同様にして行われる。但し、この場合、いずれか一方のめくらフランジ（９）を上マニホルド管（６）から取り外すだけでよい。
【００３４】
図４はこの発明による空温式液化ガス気化器の他の実施形態を示す。
【００３５】
図４において、下マニホルド管（７）の右端部外周面にはおねじ部（３０）が形成されており、このおねじ部（３０）にシール部材（図示略）を介してめねじ部付きキャップ（３１）がねじ嵌められることにより、下マニホルド管（７）の右端開口が閉鎖されている。
【００３６】
この実施形態の場合は、空温式液化ガス気化器（１）の運転を停止した後、めねじ付きキャップ（３１）を下マニホルド管（７）から取り外し、ついで下マニホルド管（７）内に、その右端開口から内視鏡（２２）を挿入し、下マニホルド管（７）とフィン付き管（８）との溶接部を内側から観察することによって、溶接部内側の検査が行われる。
【００３７】
なお、上マニホルド管（６）の両端開口も下マニホルド管（７）の右端開口と同様にして閉鎖しておき、空温式液化ガス気化器（１）の運転停止後、いずれか一方のめねじ付きキャップを上マニホルド管（６）から取り外し、ついで上マニホルド管（６）内に、いずれかの開口から内視鏡を挿入し、上マニホルド管（６）とフィン付き管（８）との溶接部を内側から観察することによって、溶接部内側の検査が行われる。
【００３８】
【発明の効果】
請求項１〜４の発明によれば、流体流通装置の稼働後にも、第１金属管と第２金属管との溶接部を内側から検査することができる。
【００３９】
請求項５〜１０の発明によれば、空温式液化ガス気化器の稼働後にも、蒸発ユニットにおけるマニホルド管とフィン付き管との溶接部を内側から検査することができる。
【図面の簡単な説明】
【図１】この発明による空温式液化ガス気化器を示す正面図である。
【図２】図１のＩＩ−ＩＩ線断面図である。
【図３】下マニホルド管とフィン付き管との溶接部を内側から検査する方法を示す斜視図である。
【図４】下マニホルド管とフィン付き管との溶接部を内側から検査する他の方法を示す斜視図である。
【符号の説明】
（１）：空温式液化ガス気化器
（２）：蒸発部
（３）：蒸発ユニット
（４）：加温部
（６）：上マニホルド管
（７）：下マニホルド管
（７ａ）：外向きフランジ
（８）：フィン付き管
（１４）：めくらフランジ
（２２）：内視鏡
（３０）：おねじ部
（３１）：めねじ部付きキャップ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluid circulation device and a method for inspecting a weld thereof, an air-temperature liquefied gas vaporizer, and a method for inspecting a weld thereof.
[0002]
In this specification, the upper and lower parts in FIG.
[0003]
[Prior Art and Problems to be Solved by the Invention]
For example, gases such as natural gas, oxygen, nitrogen, argon, helium, hydrogen, carbon dioxide, methane, propane, and ethylene are stored in a liquefied state during transportation and storage to reduce the capacity of the tank. Then, it is re-gasified by an air-heated liquefied gas vaporizer according to demand and is used.
[0004]
Conventionally, such an air-heated liquefied gas vaporizer includes an evaporator and a heater, and the evaporator includes a pair of manifold tubes arranged in parallel with each other at intervals in the vertical direction. A configuration in which a plurality of evaporating units are disposed between the two manifold tubes and each of which has a finned tube connected to the two upper and lower ends thereof is connected in parallel in a direction orthogonal to the manifold tube and the finned tube. The liquefied gas flowing from one end into the lower manifold pipe of each evaporation unit flows into the upper manifold pipe through the finned pipe after diverting to all the finned pipes, and flows into the lower manifold pipe in the upper manifold pipe. There is known an outlet that flows out from the end opposite to the inflow end into the heating section (see, for example, JP-A-2000-39099). In this air-heated liquefied gas vaporizer, the upper end of the finned pipe at the end on the inflow side into the lower manifold pipe in each evaporator unit is connected to the upper manifold pipe via an L-bend, and similarly on the opposite side. The lower end of the finned tube at the end is connected to the lower manifold tube via an L-bend.
[0005]
When such an air-heated liquefied gas vaporizer is used to vaporize combustible liquefied gas such as natural gas, leakage must not occur. Checking for presence.
[0006]
However, when the liquefied gas is vaporized by the operation of the air-heated liquefied gas vaporizer, the manifold tube and the finned tube repeatedly undergo thermal contraction and thermal expansion, so that a crack may be generated in the welded portion due to thermal stress. There is. Therefore, in the conventional air-heated liquefied gas vaporizer, the operation is periodically stopped, and the weld is inspected from the outside by the liquid flaw detection inspection method. By the way, cracks and the like may occur inside the weld due to the above thermal stress.However, with a conventional air-temperature liquefied gas vaporizer, a pressure test cannot be performed after operation, so At present, no inspection inside the weld is performed.
[0007]
The present invention has been made in view of the above circumstances, and provides a fluid circulation device capable of inspecting a welded portion from the inside even after operation, a welded portion inspection method thereof, an air-temperature liquefied gas vaporizer and a welded portion inspection method thereof. The purpose is to provide.
[0008]
[Means for Solving the Problems]
The fluid circulation device according to the first aspect of the present invention is a fluid circulation device in which one end of at least one second metal tube is welded to a peripheral wall of the first metal tube in a communicating manner. At least one opening is closed by a detachable closing member.
[0009]
According to the fluid circulation device of the first aspect of the present invention, even after the operation, the operation is stopped, the closing member is removed from the first metal tube, and the endoscope is inserted into the first metal tube from one end opening thereof. By observing the welded portion between the first metal tube and the second metal tube from the inside, an inspection from the inside of the welded portion can be performed.
[0010]
According to a second aspect of the present invention, in the first aspect of the present invention, the closing member is detachably fixed to an outward flange fixedly provided at an end of the first metal tube via a sealing member. It consists of a frustrated flange.
[0011]
According to a third aspect of the present invention, in the first aspect of the present invention, the closing member is screwed via a seal member to a male thread formed on the outer peripheral surface of the end of the first metal tube. It consists of a cap with a part.
[0012]
According to a fourth aspect of the present invention, there is provided a method for inspecting a welded portion of a fluid circulation device according to any one of the first to third aspects, wherein the closing member is removed from the first metal tube and one end thereof is inserted into the first metal tube. An endoscope is inserted through the opening, and a weld between the first metal pipe and the second metal pipe is observed from inside.
[0013]
The inspection by the method according to the fourth aspect of the present invention can be performed by stopping the operation even after the operation of the fluid circulation device.
[0014]
An air-heated liquefied gas vaporizer according to a fifth aspect of the present invention includes an evaporator and a heater, wherein the evaporator includes a pair of manifold tubes arranged in parallel with each other at intervals in the vertical direction. An evaporating unit consisting of a plurality of finned tubes arranged at intervals in the longitudinal direction of the manifold tubes between the two manifold tubes and having upper and lower ends connected to the respective manifold tubes, a manifold tube and a finned tube. The liquefied gas flowing from one end into the lower manifold pipe flows into the upper manifold pipe through the finned pipes after being diverted to all the finned pipes. In the air-heated liquefied gas vaporizer that flows out of the upper manifold pipe to the heating section, the opening at the end opposite to the liquefied gas inflow side end of the lower manifold pipe is removable. It is what is closed by the closure member.
[0015]
According to the air-heated liquefied gas vaporizer of the fifth aspect, even after operation, the operation is stopped, the closing member is removed from the lower manifold tube, and the endoscope is inserted into the lower manifold tube from one end opening. By observing the weld between the lower manifold pipe and the finned pipe from the inside, an inspection from the inside of the weld can be performed.
[0016]
An air temperature liquefied gas vaporizer according to a sixth aspect of the present invention is the air temperature type liquefied gas vaporizer according to the fifth aspect of the present invention, wherein an opening of at least one end of the upper manifold pipe is closed by a detachable closing member.
[0017]
According to the air-heated liquefied gas vaporizer of the invention of claim 6, even after operation, the operation is stopped, the closing member is removed from the upper manifold pipe, and the endoscope is inserted into the upper manifold pipe from one end opening. By observing the welded portion between the upper manifold tube and the finned tube from the inside, the inspection from the inside of the welded portion can be performed.
[0018]
The air-heated liquefied gas vaporizer according to claim 7 is the air-cooled liquefied gas vaporizer according to claim 5 or 6, wherein the closing member is provided on the outward flange fixedly provided at the end of the manifold pipe via a sealing member. It is detachably fixed and consists of a blind flange.
[0019]
In the air-heated liquefied gas vaporizer according to the invention of claim 8, in the invention of claim 5 or 6, the closing member is formed by screwing a male screw formed on the outer peripheral surface of an end portion of the manifold tube through a seal member. It is a cap with a threaded part to be fitted.
[0020]
According to a ninth aspect of the present invention, there is provided a method for inspecting a welded portion of an air-temperature liquefied gas vaporizer according to any one of claims 5 to 8, wherein the closing member is removed from the lower manifold pipe. An endoscope is inserted into the manifold tube through one end opening thereof, and a weld between the lower manifold tube and the finned tube is observed from the inside.
[0021]
According to a tenth aspect of the present invention, there is provided a method for inspecting a welded portion of an air-temperature liquefied gas vaporizer according to any one of claims 6 to 8, wherein the closing member is removed from the upper manifold pipe. An endoscope is inserted into one end opening of the manifold tube, and a weld between the upper manifold tube and the finned tube is observed from the inside.
[0022]
The observation from the inside of the welded portion by the method according to the ninth and tenth aspects can be performed by stopping the operation even after the operation of the air-temperature liquefied gas vaporizer.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
1 and 2 show the overall configuration of an air-heated liquefied gas vaporizer, and FIG. 3 shows the configuration of a main part thereof. In the following description, the left and right of FIG. 1 are referred to as left and right, the lower side of FIG. In the following description, the term “aluminum” includes an aluminum alloy in addition to pure aluminum.
[0025]
1 and 2, an air-heated liquefied gas vaporizer (1) includes an evaporation unit (2) in which a plurality of evaporation units (3) are arranged in parallel at intervals in the front-rear direction, and a plurality of evaporation units (3). A heating section (4) in which finned meandering pipes (5) are arranged in parallel at intervals in the front-rear direction.
[0026]
The evaporating unit (3) is disposed between the pair of aluminum manifold tubes (6) and (7), which are arranged in parallel with each other at intervals in the vertical direction and extend in the horizontal direction, and between the two manifold tubes (6) and (7). Aluminum finned pipe (8) arranged at intervals in the longitudinal direction (left-right direction) of the manifold pipes (6) and (7) and connected at upper and lower ends to both the manifold pipes (6) and (7), respectively. And
[0027]
Outward flanges (6a) are fixed to both ends of the upper manifold pipe (6) of the evaporating unit (3), and blind flanges (9) are attached to the outward flange (6a) via a suitable sealing material (not shown). ) Are removably fixed by bolts and nuts (both not shown), so that the openings at both ends of the upper manifold pipe (6) are closed. The left end of the lower manifold tube (7) in the front half evaporation unit (3) and the left end of the lower manifold tube (7) in the rear half evaporation unit (3) are spaced apart in the front-rear direction. And it is connected to the inlet header pipe (11) extending in the front-back direction. A branch pipe (12) is connected to the inlet header pipe (11), and a liquefied gas inlet (13) is formed at the center of the branch pipe (12). An outward flange (7a) is fixed to the right end of the lower manifold pipe (7), and a blind flange (14) is bolted to the outward flange (7a) via a suitable sealing material (not shown). The lower end of the lower manifold pipe (7) is closed (see FIG. 3) by detachably fixing the lower manifold pipe (7) with a nut (21).
[0028]
The finned tube (8) of the evaporating unit (3) is made of, for example, an extruded aluminum material. A plurality of fins (8a) extending in the vertical direction are formed radially integrally on the outer peripheral surface, and are formed on the inner peripheral surface. Inner fins (8b) formed of a plurality of ridges extending in the vertical direction are integrally formed at intervals in the circumferential direction (see FIG. 3). In each evaporating unit (3), the fins (8a) of the adjacent finned tubes (8) are connected by connecting members (15) at both upper and lower ends. The connecting member (15) has, for example, an S-shaped cross section so that when the upper and lower manifold tubes (7) expand and contract in the length direction due to the influence of heat, they can absorb the expansion and contraction.
[0029]
The heating section (4) arranges the finned meandering pipes (5) in parallel to the right side of each of the evaporation units (3) so that they are located at positions corresponding to the evaporation units (3) in the front-rear direction. It consists of. Each finned serpentine tube (5) is formed by connecting a plurality of straight tubular finned tubes (16) with U-bends (17), for example. The straight tubular finned tube (16) has the same configuration as the finned tube (8) of the evaporating unit (3), and the fins (16a) of the adjacent straight tubular finned tube (16) have upper and lower ends. They are connected by a connecting member (15). One end of each finned serpentine pipe (5) is connected to a portion of the upper manifold pipe (6) of each evaporation unit (3) on the right side of the finned pipe (8) on the right end, and the other end is also connected to a cable. It is connected to an outlet header pipe (18) which extends in the front-rear direction and is arranged below the warm part (4). A gas outlet (19) is formed in the center of the outlet header tube (18).
[0030]
In the air-heated liquefied gas vaporizer (1) having the above configuration, the liquefied gas stored in the storage tank is sent from the liquefied gas inlet (13) through the branch pipe (12) into the inlet header pipe (11). It flows into the lower manifold pipe (7) of each evaporation unit (3) through the header pipe (11). The liquefied gas flowing into the lower manifold pipe (7) is diverted to all the finned pipes (8), and exchanges heat with the atmosphere to regasify while flowing upward in the finned pipe (8). The gas flows into the finned meandering pipe (5) of the warm part (4) via the upper manifold pipe (6), and exchanges heat with the atmosphere while flowing through the finned meandering pipe (5), to a predetermined temperature. For example, it is heated to 0 ° C. or higher. The heated gas flows into the outlet header pipe (18) and is sent out from the gas outlet (19).
[0031]
According to such an air-heated liquefied gas vaporizer (1), after operation, the welding portion between the upper and lower manifold pipes (6) and (7) and the finned pipe (8) in each evaporation unit (3) is operated. The inside inspection is performed as follows.
[0032]
First, after stopping the operation of the air-heated liquefied gas vaporizer (1), as shown in FIG. 3, the blind flange (14) is removed from the outward flange (7a) of the lower manifold pipe (7). Thereafter, the endoscope (22) is inserted into the lower manifold tube (7) from the right end opening, and a weld between the lower manifold tube (7) and the finned tube (8) is observed from the inside. Thus, the inside of the weld is inspected.
[0033]
Inspection of the inside of the weld between the upper manifold pipe (6) and the finned pipe (8) is performed in a similar manner. However, in this case, it is only necessary to remove one of the blind flanges (9) from the upper manifold pipe (6).
[0034]
FIG. 4 shows another embodiment of the air-heated liquefied gas vaporizer according to the present invention.
[0035]
In FIG. 4, a male thread (30) is formed on the outer peripheral surface of the right end of the lower manifold pipe (7), and a cap with a female thread is provided on the male thread (30) via a seal member (not shown). The right end opening of the lower manifold pipe (7) is closed by the screw fitting of (31).
[0036]
In the case of this embodiment, after stopping the operation of the air-heated liquefied gas vaporizer (1), the female threaded cap (31) is removed from the lower manifold pipe (7), and then the inside of the lower manifold pipe (7) is inserted. The endoscope (22) is inserted through the right end opening, and the weld between the lower manifold pipe (7) and the finned pipe (8) is observed from the inside to inspect the inside of the weld.
[0037]
The both ends of the upper manifold pipe (6) are also closed in the same manner as the right end opening of the lower manifold pipe (7), and after the operation of the air-heated liquefied gas vaporizer (1) is stopped, one of the two ends is closed. The threaded cap is removed from the upper manifold tube (6), and then an endoscope is inserted into the upper manifold tube (6) from any opening to connect the upper manifold tube (6) with the finned tube (8). Inspection of the inside of the weld is performed by observing the weld from the inside.
[0038]
【The invention's effect】
According to the first to fourth aspects of the present invention, the welded portion between the first metal pipe and the second metal pipe can be inspected from the inside even after the operation of the fluid circulation device.
[0039]
According to the fifth to tenth aspects of the present invention, the weld between the manifold pipe and the finned pipe in the evaporation unit can be inspected from the inside even after the air-heated liquefied gas vaporizer is operated.
[Brief description of the drawings]
FIG. 1 is a front view showing an air-heated liquefied gas vaporizer according to the present invention.
FIG. 2 is a sectional view taken along line II-II of FIG.
FIG. 3 is a perspective view showing a method of inspecting a weld between a lower manifold pipe and a finned pipe from the inside.
FIG. 4 is a perspective view showing another method of inspecting a weld between the lower manifold tube and the finned tube from the inside.
[Explanation of symbols]
(1): Air-heated liquefied gas vaporizer (2): Evaporation unit (3): Evaporation unit (4): Heating unit (6): Upper manifold tube (7): Lower manifold tube (7a): Outward Flange (8): Tube with fins (14): Blind flange (22): Endoscope (30): Male thread (31): Cap with female thread

Claims (10)

第１金属管の周壁に、少なくとも１本の第２金属管の一端部が連通状に溶接されている流体流通装置であって、
第１金属管の少なくとも一端の開口が、着脱自在の閉鎖部材により閉鎖されている流体流通装置。A fluid circulation device in which one end of at least one second metal pipe is welded to a peripheral wall of the first metal pipe in a communication manner,
A fluid circulation device in which an opening of at least one end of the first metal tube is closed by a detachable closing member. 閉鎖部材が、第１金属管の端部に固定状に設けられた外向きフランジに、シール部材を介して着脱自在に固定されためくらフランジからなる請求項１記載の流体流通装置。2. The fluid circulation device according to claim 1, wherein the closing member comprises a blind flange which is detachably fixed via a sealing member to an outward flange fixedly provided at an end of the first metal tube. 閉鎖部材が、第１金属管の端部外周面に形成されたおねじ部に、シール部材を介してねじ嵌められためねじ部付きキャップからなる請求項１記載の流体流通装置。2. The fluid flow device according to claim 1, wherein the closing member is a threaded cap which is screwed into a male thread formed on the outer peripheral surface of the end of the first metal tube via a sealing member. 請求項１〜３のうちのいずれかの流体流通装置において、閉鎖部材を第１金属管から取り外し、第１金属管内に、その一端開口から内視鏡を挿入し、第１金属管と第２金属管との溶接部を内側から観察することを特徴とする流体流通装置の溶接部検査方法。The fluid circulation device according to any one of claims 1 to 3, wherein the closing member is removed from the first metal tube, and an endoscope is inserted into the first metal tube through an opening at one end thereof. A method for inspecting a welded portion of a fluid circulation device, wherein a welded portion with a metal pipe is observed from inside. 蒸発部および加温部を備えており、蒸発部が、上下方向に間隔をおいて互いに平行に配された１対のマニホルド管と、両マニホルド管間にマニホルド管の長さ方向に間隔をおいて配されかつ上下両端部がそれぞれ両マニホルド管に接続された複数のフィン付き管とよりなる蒸発ユニットを、マニホルド管およびフィン付き管と直交する方向に並列状に複数配置することにより構成されており、下マニホルド管内にその一端から流入した液化ガスが、全てのフィン付き管に分流した後フィン付き管を通って上マニホルド管内に流入し、上マニホルド管から加温部に流出するようになされた空温式液化ガス気化器において、
下マニホルド管の液化ガス流入側端部と反対側の端部の開口が、着脱自在の閉鎖部材により閉鎖されている空温式液化ガス気化器。An evaporator and a heater are provided. The evaporator includes a pair of manifold tubes arranged in parallel with each other at an interval in the vertical direction, and a space between the two manifold tubes in the longitudinal direction of the manifold tubes. And a plurality of evaporating units each including a plurality of finned tubes connected to both manifold tubes at both upper and lower ends, and arranged in parallel in a direction orthogonal to the manifold tubes and the finned tubes. The liquefied gas flowing from one end into the lower manifold pipe flows into all the finned pipes, flows into the upper manifold pipe through the finned pipes, and flows out from the upper manifold pipe to the heating section. Air-heated liquefied gas vaporizer,
An air-heated liquefied gas vaporizer in which an opening at an end of the lower manifold pipe opposite to the liquefied gas inflow end is closed by a detachable closing member. 上マニホルド管の少なくとも一端の開口が、着脱自在の閉鎖部材により閉鎖されている請求項５記載の空温式液化ガス気化器。The air-heated liquefied gas vaporizer according to claim 5, wherein an opening at at least one end of the upper manifold pipe is closed by a detachable closing member. 閉鎖部材が、マニホルド管の端部に固定状に設けられた外向きフランジに、シール部材を介して着脱自在に固定されためくらフランジからなる請求項５または６記載の空温式液化ガス気化器。7. An air-heated liquefied gas vaporizer according to claim 5, wherein the closing member comprises a blind flange which is removably fixed via a sealing member to an outward flange fixedly provided at an end of the manifold tube. . 閉鎖部材が、マニホルド管の端部外周面に形成されたおねじ部に、シール部材を介してねじ嵌められためねじ部付きキャップからなる請求項６または７記載の空温式液化ガス気化器。The air-heated liquefied gas vaporizer according to claim 6 or 7, wherein the closing member comprises a cap with a screw portion, which is screwed through a sealing member to a male screw portion formed on an outer peripheral surface of an end portion of the manifold tube. 請求項５〜８のうちのいずれかの空温式液化ガス気化器において、閉鎖部材を下マニホルド管から取り外し、下マニホルド管内に、その一端開口から内視鏡を挿入し、下マニホルド管とフィン付き管との溶接部を内側から観察することを特徴とする空温式液化ガス気化器の溶接部検査方法。The air-heated liquefied gas vaporizer according to any one of claims 5 to 8, wherein the closing member is removed from the lower manifold tube, and an endoscope is inserted into the lower manifold tube from one end opening, and the lower manifold tube and the fin are inserted. A method for inspecting a welded portion of an air-heated liquefied gas vaporizer, comprising observing a welded portion with an attached pipe from inside. 請求項６〜８のうちのいずれかの空温式液化ガス気化器において、閉鎖部材を上マニホルド管から取り外し、上マニホルド管内に、その一端開口から内視鏡を挿入し、上マニホルド管とフィン付き管との溶接部を内側から観察することを特徴とする空温式液化ガス気化器の溶接部検査方法。The air-heated liquefied gas vaporizer according to any one of claims 6 to 8, wherein the closing member is removed from the upper manifold tube, an endoscope is inserted into the upper manifold tube from one end opening, and the upper manifold tube and the fin are inserted. A method for inspecting a welded portion of an air-heated liquefied gas vaporizer, comprising observing a welded portion with a pipe with a pipe from inside.
JP2002205693A 2002-07-15 2002-07-15 Fluid circulating device, its welded part examining method, air heating-type liquefied gas evaporator, and its welded part examining method Pending JP2004044975A (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
KR20200010789A (en) * 2018-07-23 2020-01-31 (주)마이텍 Cold test method of carburetor weld using jig tank

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200010789A (en) * 2018-07-23 2020-01-31 (주)마이텍 Cold test method of carburetor weld using jig tank
KR102080401B1 (en) 2018-07-23 2020-02-21 (주)마이텍 Cold test method of carburetor weld using jig tank

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