JP2018134609A - Piping flushing method and water supply system - Google Patents

Piping flushing method and water supply system Download PDF

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JP2018134609A
JP2018134609A JP2017032157A JP2017032157A JP2018134609A JP 2018134609 A JP2018134609 A JP 2018134609A JP 2017032157 A JP2017032157 A JP 2017032157A JP 2017032157 A JP2017032157 A JP 2017032157A JP 2018134609 A JP2018134609 A JP 2018134609A
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pipe
water
pure water
piping
valve
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JP6940958B2 (en
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悠介 関根
Yusuke Sekine
悠介 関根
佐藤　達也
Tatsuya Sato
佐藤　　達也
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Organo Corp
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Japan Organo Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a piping flushing method that can use a pump permanently installed on the piping and has high efficiency for removing a foreign matter.SOLUTION: A piping flushing method repeats: a full water step of fully filling water into piping 2; and a draining step of supplying compressed air into the piping fully filled with water to drain the water from the piping. A gas flow circulates over a piping inner wall while water content adheres thereto after draining and the water moves along the inner wall of piping, effectively captures and conveys a foreign matter adhering to the inner wall of piping.SELECTED DRAWING: Figure 2

Description

本発明は、配管のフラッシング方法及び水供給システムに関し、特に薬品の製造に用いられる純水供給配管のフラッシング方法に関する。   The present invention relates to a flushing method for a pipe and a water supply system, and more particularly to a flushing method for a pure water supply pipe used for manufacturing a chemical.

医薬品の製造のために用いられる純水は一般に、専用の純水供給システムから供給される。純水供給システムは閉ループをなす循環配管と、循環配管上に設置された純水貯水槽及びポンプと、ユースポイントを形成する分岐管と、を有している。分岐管の開放端の近傍には弁が取り付けられており、弁を操作することで必要なときに純水を取り出すことができる。配管中の水のよどみとそれに伴う菌の発生を防止するため、配管内の純水は常時ポンプで循環させられている。ユースポイントで使用されなかった純水は貯水槽に戻り、再びユースポイントに向けて移送される。ユースポイントで消費された純水を補うため、貯水槽には純水製造装置で製造された純水が供給される。   The pure water used for the manufacture of pharmaceuticals is generally supplied from a dedicated pure water supply system. The pure water supply system includes a circulation pipe that forms a closed loop, a pure water storage tank and a pump installed on the circulation pipe, and a branch pipe that forms a use point. A valve is attached in the vicinity of the open end of the branch pipe, and pure water can be taken out when necessary by operating the valve. In order to prevent stagnation of water in the piping and the accompanying generation of bacteria, the pure water in the piping is constantly circulated by a pump. Pure water that has not been used at the use point returns to the water tank and is transported to the use point again. In order to make up for the pure water consumed at the point of use, pure water produced by a pure water production apparatus is supplied to the water storage tank.

このような純水供給システムの循環配管の内部は、現場に設置した際に金属粉等の異物で汚染されているためフラッシング（洗浄）を行う必要がある。特許文献１には、循環配管の一部を未設置として配管に開口を設け、その開口にホースを挿入し、水を注入してフラッシングを行うことが開示されている。   Since the inside of the circulation pipe of such a pure water supply system is contaminated with foreign substances such as metal powder when installed on the site, it is necessary to perform flushing (cleaning). Patent Document 1 discloses that a part of a circulation pipe is not installed, an opening is provided in the pipe, a hose is inserted into the opening, and water is injected to perform flushing.

特開２００４−２５５３４６号公報JP 2004-255346 A

配管内部に水を注入する従来のフラッシング方法では、フラッシング水が届く範囲が限られる。このため、長い配管の場合、複数の開口を設け、各開口に作業員を配置するか、ホースの挿入箇所を順次変えながら作業を行う必要がある。これに対し、配管上に貯水槽とポンプが配置されている場合、ポンプで貯水槽の水を圧送しながらフラッシングを行うことができる。具体的には、配管の一部を未設置として配管に開口を設け、この開口を排水口として利用することで、仮設設備を大幅に削減することができる。また、開口は一箇所あればよいため、作業員の数を減らすことも可能である。   In the conventional flushing method in which water is injected into the pipe, the range in which the flushing water can reach is limited. For this reason, in the case of a long pipe, it is necessary to provide a plurality of openings and arrange an operator in each opening, or perform an operation while sequentially changing the insertion position of the hose. On the other hand, when the water tank and the pump are arranged on the pipe, the flushing can be performed while the water in the water tank is pumped by the pump. Specifically, provisional equipment can be greatly reduced by providing an opening in the pipe with part of the pipe not installed and using the opening as a drain outlet. In addition, since only one opening is required, the number of workers can be reduced.

しかし、この方法ではフラッシング水の流速がポンプの流速で規制されることになる。水流で配管内部の汚染を除去する場合、できる限り高流速で水を循環させることが望ましいが、ポンプの性能上そのような水流を実現することが難しい場合がある。   However, in this method, the flow rate of flushing water is regulated by the flow rate of the pump. When removing contamination inside the pipe with a water flow, it is desirable to circulate the water at a flow rate as high as possible, but it may be difficult to realize such a water flow because of the performance of the pump.

本発明は、配管上に常設されたポンプを用いることができ、かつ異物の除去効率の高い配管のフラッシング方法を提供することを目的とする。   An object of this invention is to provide the flushing method of piping which can use the pump permanently installed on piping and has high removal efficiency of a foreign material.

本発明の配管のフラッシング方法は、配管を満水にする満水工程と、満水にされた配管に圧縮された気体を供給して、配管中の水を圧送して排水する排水工程とを繰り返す。   The pipe flushing method of the present invention repeats a filling process for filling the pipe with water and a draining process for supplying compressed gas to the filled pipe and pumping and draining the water in the pipe.

本発明によれば、満水状態の配管に圧縮された気体を供給し、配管内の水が気体流によって排出される。予め配管内を満水にしてあるため、配管内の水がほぼ気体で置換されたときにも、配管の内壁のほぼ全面は濡れた状態となっている。この状態で気体流が配管の内壁に沿って流動すると、水が配管の内壁に沿って移動し、移動する水によって、配管の内壁に付着した付着した異物を効率的に捕捉し運搬することができる。気体の流量を調整することで、配管内の気体の流速を高めることも容易である。一方、ポンプは配管を満水にするために使用されるため、高い流速は不要であり、容量の制約は小さい。従って、本発明によれば、配管上に常設されたポンプを用いることができ、かつ異物の除去効率の高い配管のフラッシング方法を提供することができる。   According to the present invention, compressed gas is supplied to a pipe in a full water state, and water in the pipe is discharged by a gas flow. Since the inside of the pipe is filled with water in advance, even when the water in the pipe is replaced with gas, almost the entire inner wall of the pipe is wet. In this state, when the gas flow flows along the inner wall of the pipe, the water moves along the inner wall of the pipe, and the moving water can efficiently capture and transport the attached foreign matter attached to the inner wall of the pipe. it can. By adjusting the gas flow rate, it is easy to increase the flow rate of the gas in the pipe. On the other hand, since the pump is used to fill the pipe with water, a high flow rate is unnecessary, and the capacity restriction is small. Therefore, according to the present invention, a pump permanently installed on the pipe can be used, and a pipe flushing method with high foreign matter removal efficiency can be provided.

純水供給システムの概略構成図である。It is a schematic block diagram of a pure water supply system. フラッシングが行われる前の純水供給システムを示す概略図である。It is the schematic which shows the pure water supply system before flushing is performed. 満水工程中の純水供給システムを示す概略図である。It is the schematic which shows the pure water supply system in a full water process. 排水工程中の純水供給システムを示す概略図である。It is the schematic which shows the pure water supply system in a drainage process.

以下、図面を参照して本発明の配管のフラッシング方法の実施形態を説明する。   Hereinafter, an embodiment of a flushing method for piping according to the present invention will be described with reference to the drawings.

本発明は主に製薬の分野で用いられる純水供給システムにおける純水循環配管のフラッシング方法に関する。しかし、本発明は製薬に限定されず、例えば食品、飲料などの製造に用いられる純水循環配管にも適用でき、さらに一般に純水を供給する純水循環配管にも適用可能である。また、本発明は純水に限らず、ＩＰＡなどの有機溶媒、超純水などの循環配管にも適用できる。   The present invention relates to a flushing method for pure water circulation piping in a pure water supply system mainly used in the field of pharmaceuticals. However, the present invention is not limited to pharmaceuticals, and can be applied to, for example, pure water circulation pipes used in the manufacture of foods, beverages, and the like, and can also be applied to pure water circulation pipes that supply pure water. Further, the present invention is not limited to pure water, but can also be applied to circulation piping such as an organic solvent such as IPA and ultrapure water.

図１は純水供給システムの概略構成を示している。純水供給システム１は、純水循環配管２と、純水循環配管２上に設けられた貯水槽３と、同じく純水循環配管２上に設けられたポンプ４と、を有している。純水循環配管２のポンプ４の下流にはユースポイント６ａ〜６ｃが設置されている。純水循環配管２は閉ループをなし、ユースポイント６ａ〜６ｃで使用されなかった純水が貯水槽３に戻るようになっている。純水循環配管２の口径はユースポイント６ａ〜６ｃの上流側で大きく、ユースポイント６ａ〜６ｃの下流側で小さくされている。一例では、純水循環配管２の口径はユースポイント６ａ〜６ｃの上流側でＩＤＦ（国際酪農連盟）規格の２．５Ｓ（内径５９．５ｍｍ）、ユースポイント６ａ〜６ｃの上流側でＩＤＦ規格の１．５Ｓ（内径３５．７ｍｍ）となっている。純水循環配管２はステンレス鋼で作成され、表面に酸化被膜を形成することで不動態化処理がされている。貯水槽３には純水が貯蔵されている。貯水槽３は純水製造装置（図示せず）と接続されており、ユースポイント６ａ〜６ｃで消費された純水を補うようにされている。ポンプ４は貯水槽３の下流に設けられ、貯水槽３に貯蔵された純水を圧送する。ポンプ４は点検時を除き常時運転されており、従って純水循環配管２内の純水は常時循環している。これによって、純水循環配管２内の水のよどみが防止され、万が一純水循環配管２内に菌が発生した場合でも、菌の繁殖を抑えることができる。   FIG. 1 shows a schematic configuration of a pure water supply system. The pure water supply system 1 includes a pure water circulation pipe 2, a water tank 3 provided on the pure water circulation pipe 2, and a pump 4 provided on the pure water circulation pipe 2. Use points 6 a to 6 c are installed downstream of the pump 4 of the pure water circulation pipe 2. The pure water circulation pipe 2 forms a closed loop so that the pure water that has not been used at the use points 6 a to 6 c returns to the water storage tank 3. The diameter of the pure water circulation pipe 2 is large on the upstream side of the use points 6a to 6c, and is made small on the downstream side of the use points 6a to 6c. In one example, the diameter of the pure water circulation pipe 2 is 2.5S (inner diameter 59.5 mm) of the IDF (International Dairy Federation) standard on the upstream side of the use points 6a to 6c, and the IDF standard on the upstream side of the use points 6a to 6c. 1.5S (inside diameter 35.7 mm). The pure water circulation pipe 2 is made of stainless steel, and is passivated by forming an oxide film on the surface. Pure water is stored in the water tank 3. The water storage tank 3 is connected to a pure water production apparatus (not shown), and supplements pure water consumed at the use points 6a to 6c. The pump 4 is provided downstream of the water storage tank 3 and pumps pure water stored in the water storage tank 3. The pump 4 is always operated except at the time of inspection, and therefore the pure water in the pure water circulation pipe 2 is constantly circulated. Thereby, stagnation of water in the pure water circulation pipe 2 is prevented, and even if bacteria are generated in the pure water circulation pipe 2, the propagation of the bacteria can be suppressed.

純水循環配管２上のポンプ４の下流には第１の弁５が設けられている。純水循環配管２上の第１の弁５の下流には、後述する仮設の気体供給手段１１が接続される第１の接続部７が設けられている。   A first valve 5 is provided downstream of the pump 4 on the pure water circulation pipe 2. A first connection portion 7 to which a temporary gas supply means 11 described later is connected is provided downstream of the first valve 5 on the pure water circulation pipe 2.

純水循環配管２の第１の接続部７の下流には複数のユースポイント６ａ〜６ｃが設けられている。ユースポイント６ａ〜６ｃは純水を供給する場所、例えば錠剤印刷室、造粒室などに設けられる。図には３つのユースポイント６ａ〜６ｃが示されているが、その数は限定されない。ユースポイント６ａ〜６ｃは、純水循環配管２の第１の接続部７の下流の第２の接続部８ａ〜８ｃに接続された分岐管９ａ〜９ｃと、その先端の近傍に設けられた弁１０ａ〜１０ｃと、によって構成されており、弁１０ａ〜１０ｃを開くことで開放可能となっている。製薬用途の場合、ユースポイント６ａ〜６ｃはクリーンルームに設けられることが多いが、クリーンルームの外側にあっても構わない。また、ユースポイント６ａ〜６ｃは純水循環配管２上に直列に配置されているが、純水循環配管２にバイパス管を設け、バイパス管にユースポイントを設けてもよい。ユースポイント６ａ〜６ｃの設置位置は製薬工場のレイアウトによって様々であるが、一般に複数の階に分散している。このため、純水循環配管２は水平方向だけでなく上下方向にも引き回されている。後述する気体供給ユニット１１（第１の接続部７）は純水循環配管２のほぼ最下部に設置されるため、第１の接続部７の下流側には純水の流動方向において、すなわち第１の接続部７から第２の接続部８ａ〜８ｃに向けて、上方に延びる立ち上がり部２ａが形成されている。   A plurality of use points 6 a to 6 c are provided downstream of the first connection portion 7 of the pure water circulation pipe 2. The use points 6a to 6c are provided in a place where pure water is supplied, for example, a tablet printing chamber, a granulation chamber, and the like. Although three use points 6a to 6c are shown in the figure, the number is not limited. The use points 6a to 6c include branch pipes 9a to 9c connected to the second connection portions 8a to 8c downstream of the first connection portion 7 of the pure water circulation pipe 2, and valves provided in the vicinity of the distal ends thereof. 10a to 10c, and can be opened by opening the valves 10a to 10c. In the case of pharmaceutical use, the use points 6a to 6c are often provided in a clean room, but may be outside the clean room. Moreover, although the use points 6a-6c are arrange | positioned in series on the pure water circulation piping 2, a bypass pipe may be provided in the pure water circulation piping 2, and a use point may be provided in a bypass pipe. The installation positions of the use points 6a to 6c vary depending on the layout of the pharmaceutical factory, but are generally distributed on a plurality of floors. For this reason, the pure water circulation pipe 2 is routed not only in the horizontal direction but also in the vertical direction. Since the gas supply unit 11 (first connection portion 7) to be described later is installed at the substantially lowermost portion of the pure water circulation pipe 2, the downstream side of the first connection portion 7 is in the flow direction of pure water, that is, A rising portion 2a extending upward is formed from one connecting portion 7 toward the second connecting portions 8a to 8c.

次に、以上説明した水供給システムの純水循環配管２のフラッシング方法について述べる。純水循環配管２を設置する場合は、純水循環配管２を複数の配管要素に分けて製作し、各部分を溶接、フランジなどで接合する。純水循環配管２の内壁には純水循環配管２の製作時や溶接時に発生した金属粉、塵埃、微粒子などの異物が付着している。図２を参照すると、純水循環配管２は貯水槽３の純水戻り側の部分を除いて設置される。この時点で、純水循環配管２は貯水槽３に接続された第１の端部２ｂと開放端である第２の端部２ｃを有する開いた配管である。第１の端部２ｂは水の流動方向に関し最上流点であり、第２の端部２ｃは水の流動方向に関し最下流点である。第２の端部２ｃには予め排水用の仮設管２１を取り付けておく。仮設管２１はゴムチューブなどを用いることができる。仮設管２１は弁２２が設けられており開閉可能となっている。第２の端部２ｃと貯水槽３の純水戻りノズル３ａとの間の未設置区間の純水循環配管２はフラッシング水によって洗浄されない。このため、この区間の純水循環配管２はできるだけ短くするとともに、別途洗浄を行っておくことが望ましい。   Next, a flushing method for the pure water circulation pipe 2 of the water supply system described above will be described. When the pure water circulation pipe 2 is installed, the pure water circulation pipe 2 is manufactured by dividing it into a plurality of piping elements, and each part is joined by welding, a flange, or the like. On the inner wall of the pure water circulation pipe 2, foreign matters such as metal powder, dust, and fine particles generated during the production of the pure water circulation pipe 2 and welding are adhered. Referring to FIG. 2, the pure water circulation pipe 2 is installed except for the pure water return side portion of the water storage tank 3. At this time, the pure water circulation pipe 2 is an open pipe having a first end 2b connected to the water storage tank 3 and a second end 2c which is an open end. The first end 2b is the most upstream point with respect to the direction of water flow, and the second end 2c is the most downstream point with respect to the direction of water flow. A temporary pipe 21 for drainage is attached to the second end 2c in advance. The temporary tube 21 can be a rubber tube or the like. The temporary pipe 21 is provided with a valve 22 and can be opened and closed. The pure water circulation pipe 2 in the non-installed section between the second end 2c and the pure water return nozzle 3a of the water storage tank 3 is not washed with the flushing water. For this reason, it is desirable that the pure water circulation pipe 2 in this section be as short as possible and cleaned separately.

次に、第１の接続部７に仮設の気体供給管１２が接続される。気体供給管１２から供給される気体は空気に限定されないが、コストの関係から空気を使うことが好ましい。気体供給管１２は気体供給ユニット１１に接続されている。気体供給ユニット１１は、気体供給ユニット１１の外部から供給された圧縮空気の空気圧を調整するレギュレータ１４と、空気中の塵埃、異物を除去するフィルタ１５と、空気の供給を制御する第２の弁１６と、を有しており、これらが管路上に上流から下流に向けて直列に配置されている。気体供給管１２は金属の配管、ゴムチューブなどを用いることができる。タンク１３の代わりに圧縮機などの圧縮空気を生成可能な設備を設けることもできる。空気の圧力を高めることで、純水循環配管２内の水をより強い力で押出し、排出することができる。気体供給管１２の下流側の端部は第１の接続部７に接続される。   Next, the temporary gas supply pipe 12 is connected to the first connection portion 7. The gas supplied from the gas supply pipe 12 is not limited to air, but it is preferable to use air from the viewpoint of cost. The gas supply pipe 12 is connected to the gas supply unit 11. The gas supply unit 11 includes a regulator 14 that adjusts the air pressure of compressed air supplied from the outside of the gas supply unit 11, a filter 15 that removes dust and foreign matter in the air, and a second valve that controls the supply of air. 16 are arranged in series on the pipe line from upstream to downstream. The gas supply pipe 12 can be a metal pipe, a rubber tube, or the like. Instead of the tank 13, a facility such as a compressor that can generate compressed air can be provided. By increasing the pressure of the air, the water in the pure water circulation pipe 2 can be pushed out and discharged with a stronger force. The downstream end of the gas supply pipe 12 is connected to the first connection portion 7.

気体供給管１２の第２の弁１６と第１の接続部７の間からドレン管１７が分岐している。ドレン管１７は金属の配管、ゴムチューブなどを用いることができる。ドレン管１７は主に純水循環配管２の立ち上がり部２ａに残留した水を重力によって排水するために用いられる。ドレン管１７には開閉可能な弁１８が設けられている。   A drain pipe 17 is branched from between the second valve 16 of the gas supply pipe 12 and the first connection portion 7. The drain pipe 17 can be a metal pipe, a rubber tube, or the like. The drain pipe 17 is mainly used for draining water remaining in the rising portion 2a of the pure water circulation pipe 2 by gravity. The drain pipe 17 is provided with a valve 18 that can be opened and closed.

本実施形態では、純水循環配管２を満水にする満水工程と、満水にされた純水循環配管２に気体を供給して、純水循環配管２中の水を排出する排水工程とが繰り返される。以下、満水工程と排水工程について説明する。   In the present embodiment, a full water process for filling the pure water circulation pipe 2 and a draining process for supplying gas to the filled pure water circulation pipe 2 and discharging the water in the pure water circulation pipe 2 are repeated. It is. Hereinafter, the full water process and the drainage process will be described.

図３に示すように、満水工程ではまず、第１の弁５が開けられ、第２の弁１６と、分岐管９ａ〜９ｃの弁１０ａ〜１０ｃと、ドレン管１７の弁１８を閉じ、貯水槽３に貯蔵された水をポンプ４で純水循環配管２に圧送する。これによって純水循環配管２は満水となる。仮設管２１の弁２２は純水循環配管２の空気を抜くため、純水循環配管２が満水になるまで開いておき、満水になった後に閉める。（コメント：図２も修正しております）必要な場合、純水製造設備から貯水槽３へ純水が補給される。   As shown in FIG. 3, in the water filling process, first, the first valve 5 is opened, the second valve 16, the valves 10a to 10c of the branch pipes 9a to 9c, and the valve 18 of the drain pipe 17 are closed to store the water. The water stored in the tank 3 is pumped to the pure water circulation pipe 2 by the pump 4. As a result, the pure water circulation pipe 2 becomes full. The valve 22 of the temporary pipe 21 is opened until the pure water circulation pipe 2 becomes full in order to remove air from the pure water circulation pipe 2, and is closed after the water is full. (Comment: Figure 2 has also been modified) When necessary, pure water is supplied from the pure water production facility to the water storage tank 3.

次に排水工程を行う。図４に示すように、まず第１の弁５を閉じ、第２の弁１６と分岐管９ａ〜９ｃの弁１０ａ〜１０ｃと、第２の端部２ｃに接続された仮設管２１の弁２２を開き、気体供給ユニット１１から純水循環配管２に空気を供給する。空気の一部は気泡となって水中を通過するが、ほとんどの空気は水を圧送、すなわち水を押し出すように作用する。純水循環配管２の内部の水は空気によって圧送され、分岐管９ａ〜９ｃと仮設管２１の端部から排出される。このように、気体供給ユニット１１は純水循環配管２の内部の水を圧送するポンプの役割を果たす。純水循環配管２の内壁に付着した異物の多くは水流によって剥離され、移送される。   Next, a drainage process is performed. As shown in FIG. 4, the first valve 5 is first closed, the second valve 16, the valves 10a to 10c of the branch pipes 9a to 9c, and the valve 22 of the temporary pipe 21 connected to the second end 2c. And air is supplied from the gas supply unit 11 to the pure water circulation pipe 2. Some of the air passes through the water as bubbles, but most of the air acts to pump water, that is, to push out the water. Water inside the pure water circulation pipe 2 is pumped by air and discharged from the ends of the branch pipes 9 a to 9 c and the temporary pipe 21. Thus, the gas supply unit 11 serves as a pump that pumps water inside the pure water circulation pipe 2. Most of the foreign matter adhering to the inner wall of the pure water circulation pipe 2 is peeled off by the water flow and transferred.

空気によって純水循環配管２の内部の水のほとんどが排出されたとき、純水循環配管２の内壁には水分ないし湿分が付着している。水分は純水循環配管２の内壁の状態によって膜状または液滴状であるが、内壁は湿った状態にある。また、水と一緒に排出されなかった異物が、純水循環配管２の内壁に付着している。さらに気体供給ユニット１１から空気を供給すると、内壁に付着した水分は純水循環配管２の内壁に沿って移動する。このときの水分の移動に随伴して、内壁に付着した異物がさらに移動する。この現象は、例えば洗面台や浴槽の水がほとんど排水された後、壁面に残った異物が水のしずくに乗って排出される現象と類似している。純水循環配管２では、洗面台や浴槽と異なり、水を動かすために必ずしも重力を利用できないため（例えば、配管の水平部や上向き勾配部）、水を動かすための駆動力として空気流が利用されている。容器の壁面を流れる異物は最終的に分岐管９ａ〜９ｃと仮設管２１の端部から排出される。   When most of the water in the pure water circulation pipe 2 is discharged by the air, moisture or moisture is attached to the inner wall of the pure water circulation pipe 2. Although the moisture is in the form of a film or droplet depending on the state of the inner wall of the pure water circulation pipe 2, the inner wall is in a moist state. In addition, foreign matters that have not been discharged together with water adhere to the inner wall of the pure water circulation pipe 2. Further, when air is supplied from the gas supply unit 11, the moisture attached to the inner wall moves along the inner wall of the pure water circulation pipe 2. Accompanying the movement of moisture at this time, the foreign matter attached to the inner wall further moves. This phenomenon is similar to, for example, a phenomenon in which foreign matter remaining on the wall surface is discharged on water drops after most of the water in the washstand or bathtub is drained. In the pure water circulation pipe 2, unlike the washstand and bathtub, gravity cannot always be used to move the water (for example, the horizontal part or upward slope part of the pipe), so the air flow is used as the driving force to move the water. Has been. Foreign matter flowing on the wall surface of the container is finally discharged from the branch pipes 9a to 9c and the end of the temporary pipe 21.

満水状態の純水循環配管２に空気を供給するときは、純水循環配管２内の水は空気の圧力で圧送されるが、純水循環配管２や仮設管２１の圧力損失のため、高流速では流れない。しかし純水循環配管２内の水がほとんど排出された後は、空気流は高流速で流れることができる。純水循環配管２の内壁の水分は気体によって吹き飛ばされ、異物も吹き飛ばされた水に随伴して純水循環配管２内を移動する。この際、純水循環配管２の内壁が濡れているため、異物が内壁から一層剥がれやすくなる。これらの効果によって異物を効率的に剥離し、移動させることができる。また、空気流の流速は空気圧を高めることで容易に調整可能である。   When supplying air to the pure water circulation pipe 2 in a full water state, the water in the pure water circulation pipe 2 is pumped by the pressure of the air. It does not flow at the flow rate. However, after most of the water in the pure water circulation pipe 2 is discharged, the air flow can flow at a high flow rate. Moisture on the inner wall of the pure water circulation pipe 2 is blown off by the gas, and foreign substances move in the pure water circulation pipe 2 along with the blown-off water. At this time, since the inner wall of the pure water circulation pipe 2 is wet, the foreign matter is more easily separated from the inner wall. Due to these effects, foreign substances can be efficiently peeled and moved. Further, the flow rate of the air flow can be easily adjusted by increasing the air pressure.

その後、満水工程と排水工程を交互に繰り返す。異物が除去されたことの確認は、例えば満水状態でユースポイント６ａ〜６ｃの分岐管９ａ〜９ｃの弁１０ａ〜１０ｃを開き、分岐管９ａ〜９ｃから排出された水をガーゼ、フィルタ等でサンプリングし、目視検査をすることによって行うことができる。あるいは仮設管２１から排出される水を同様の方法でサンプリングし、目視検査をすることによって行うことができる。   Then, a full water process and a drainage process are repeated alternately. Confirm that the foreign matter has been removed by opening the valves 10a to 10c of the branch pipes 9a to 9c of the use points 6a to 6c in a full state, and sampling the water discharged from the branch pipes 9a to 9c with a gauze, a filter or the like It can be done by visual inspection. Alternatively, the water discharged from the temporary pipe 21 can be sampled by the same method and visually inspected.

排水工程の後、気体供給管１２に接続されたドレン管１７の弁１８を開き純水循環配管２内の水を排水してもよい。純水循環配管２の立ち上がり部２ａの高さが高い場合、空気流で水を持ち上げることが困難な場合がある。この場合、純水循環配管２の最下部に水が残存する可能性がある。第１の接続部７を純水循環配管２の最下部に設けることで、ドレン管１７から純水循環配管２内に残存した水を容易に排出することができる。なお、水が確実に排出されるように、第１の接続部７からみて純水循環配管２の両側を上り勾配としておくことが望ましい。同様に、ユースポイント６ａ〜６ｃをその近傍の純水循環配管２の最下部となる位置に設置することで、ユースポイント６ａ〜６ｃから排水することができる。ドレン管１７を純水循環配管２に直接設けると、純水供給システム１の運転中にドレン管１７の内部や分岐部に水が滞留しやすく、菌の発生や金属部からの溶出などが生じやすい。これに対して本発明では、ドレン管１７は仮設の気体供給管１２に接続されているため、フラッシングの終了後は純水循環配管２の内壁に水のよどみが生じやすい部位がなくなる。   After the draining process, the valve 18 of the drain pipe 17 connected to the gas supply pipe 12 may be opened to drain the water in the pure water circulation pipe 2. When the height of the rising portion 2a of the pure water circulation pipe 2 is high, it may be difficult to lift water with an air flow. In this case, water may remain at the lowermost part of the pure water circulation pipe 2. By providing the 1st connection part 7 in the lowest part of the pure water circulation piping 2, the water which remained in the pure water circulation piping 2 from the drain pipe 17 can be discharged | emitted easily. In addition, it is desirable that both sides of the pure water circulation pipe 2 have an upward slope as viewed from the first connection portion 7 so that the water is surely discharged. Similarly, it is possible to drain from the use points 6a to 6c by installing the use points 6a to 6c at the lowermost position of the pure water circulation pipe 2 in the vicinity thereof. If the drain pipe 17 is provided directly in the pure water circulation pipe 2, water tends to stay in the drain pipe 17 or the branch part during the operation of the pure water supply system 1, and generation of bacteria or elution from the metal part occurs. Cheap. On the other hand, in the present invention, since the drain pipe 17 is connected to the temporary gas supply pipe 12, there is no portion where water stagnation is likely to occur on the inner wall of the pure water circulation pipe 2 after the flushing is completed.

以上の工程により純水循環配管２内の異物がほぼ除去されると、気体供給管１２を第１の接続部７から取り外し、第１の接続部７を閉止する。また、第２の端部２ｃから仮設管２１を取り外し、第２の端部２ｃと貯水槽３の純水戻りノズル３ａとの間に未設置の配管要素を設置して、純水循環配管２を完成させる。未設置の配管要素を設置する際に異物が発生する可能性があるため、ポンプ４で循環運転を行い、ユースポイント６ａ〜６ｃから異物を排出することが望ましい。これによって純水循環配管２のフラッシングが完了する。   When the foreign matter in the pure water circulation pipe 2 is almost removed by the above steps, the gas supply pipe 12 is removed from the first connection portion 7 and the first connection portion 7 is closed. Further, the temporary pipe 21 is removed from the second end 2c, and an uninstalled piping element is installed between the second end 2c and the pure water return nozzle 3a of the water storage tank 3, so that the pure water circulation pipe 2 is provided. To complete. Since foreign matter may be generated when an uninstalled piping element is installed, it is desirable to perform circulation operation with the pump 4 and discharge the foreign matter from the use points 6a to 6c. Thereby, the flushing of the pure water circulation pipe 2 is completed.

上述のように、本実施形態は、満水工程と排水工程を繰り返し行うことで、純水循環配管２の内壁に付着した異物を排出する。ポンプ４を用いて水を流通させる場合と比べて、高速の気体流による異物の剥離効果と移送効果が得られる。ポンプ４の容量を上げて高流速で水を流通させることでも、ある程度の剥離効果と移送効果は得られるが、フラッシングの目的でポンプ４の容量を増加するのはコスト的に不利である。また、一般に純水循環配管２はユースポイント６ａ〜６ｃの下流側ではユースポイント６ａ〜６ｃの上流側より流路が絞られているため、ポンプ４の容量を上げても高速の水流が得られるとは限らない。ポンプ４の容量にもよるが、一般に純水循環配管２の内径が５０ｍｍを超えると流速が低下するため、水流だけで異物を剥離させることは困難である。さらに、水流で異物を排出する場合、フラッシング水の供給能力、排水量の制限などにより必要な流量の確保が難しいことがある。またユースポイント６ａ〜６ｃでの漏水の監視のため各ユースポイント６ａ〜６ｃに人員を配置する必要がある。これに対し本発明では、ポンプ４は純水循環配管２を満水にする目的で使用され、水流で異物を剥離させるだけの高流速を必要としないため、ポンプ４の容量は剥離効果と移送効果にほとんど影響を与えない。   As described above, in the present embodiment, the foreign matter attached to the inner wall of the pure water circulation pipe 2 is discharged by repeatedly performing the water filling process and the draining process. Compared with the case where water is circulated using the pump 4, the effect of removing foreign matter and the effect of transferring by a high-speed gas flow can be obtained. Even if the capacity of the pump 4 is increased and water is circulated at a high flow rate, a certain peeling effect and transfer effect can be obtained, but it is disadvantageous in terms of cost to increase the capacity of the pump 4 for the purpose of flushing. Further, since the pure water circulation pipe 2 is generally narrower in the downstream side of the use points 6a to 6c than the upstream side of the use points 6a to 6c, a high-speed water flow can be obtained even if the capacity of the pump 4 is increased. Not necessarily. Although it depends on the capacity of the pump 4, in general, when the inner diameter of the pure water circulation pipe 2 exceeds 50 mm, the flow velocity decreases, so that it is difficult to separate the foreign matter only with the water flow. Furthermore, when discharging foreign matter with a water flow, it may be difficult to ensure a necessary flow rate due to the supply capacity of flushing water, the amount of drainage, and the like. In addition, it is necessary to place personnel at each of the use points 6a to 6c in order to monitor water leakage at the use points 6a to 6c. On the other hand, in the present invention, the pump 4 is used for the purpose of filling the pure water circulation pipe 2 and does not require a high flow velocity enough to separate the foreign matter with the water flow. Has little effect on

一方、気体流だけで異物を排出する場合、内壁に付着した異物を剥離するのが困難な場合がある。これに対し本発明では、内壁に水分が付着しているため異物が剥離しやすくなり、また内壁に沿って移動する水分が異物を効率的に移送する。   On the other hand, when discharging foreign matter only with a gas flow, it may be difficult to peel off the foreign matter attached to the inner wall. On the other hand, in this invention, since the water | moisture content has adhered to the inner wall, it becomes easy to peel a foreign material, and the water | moisture content which moves along an inner wall transfers a foreign material efficiently.

１ 純水供給システム
２ 純水循環配管
２ａ 立ち上がり部
２ｂ 第１の端部
２ｃ 第２の端部
３ 貯水槽
４ ポンプ
５ 第１の弁
６ａ〜６ｃ ユースポイント
７ 第１の接続部
８ａ〜８ｃ 第２の接続部
９ａ〜９ｃ 分岐管
１０ａ〜１０ｃ 弁
１１ 気体供給ユニット
１２ 空気供給管
１３ タンク
１４ レギュレータ
１５ フィルタ
１６ 第２の弁
１７ ドレン管
１８ 弁
２１ 仮設管
２２ 弁 DESCRIPTION OF SYMBOLS 1 Pure water supply system 2 Pure water circulation piping 2a Standing part 2b 1st edge part 2c 2nd edge part 3 Water tank 4 Pump 5 1st valve 6a-6c Use point 7 1st connection part 8a-8c 1st 2 connection portions 9a to 9c Branch pipes 10a to 10c Valve 11 Gas supply unit 12 Air supply pipe 13 Tank 14 Regulator 15 Filter 16 Second valve 17 Drain pipe 18 Valve 21 Temporary pipe 22 Valve

Claims (7)

配管を満水にする満水工程と、満水にされた前記配管に圧縮された気体を供給して、前記配管中の水を排水する排水工程とを繰り返す、配管のフラッシング方法。   A flushing method for a pipe, wherein a filling process for filling the pipe with water and a draining process for supplying the compressed gas to the filled pipe and draining the water in the pipe are repeated. 前記配管の第１の端部に水を貯蔵する貯水槽が接続され、前記配管の前記貯水槽の下流にポンプが設けられ、前記ポンプの下流に第１の弁が設けられ、前記第１の弁の下流の第１の接続部に、第２の弁が設けられた気体供給管が接続され、前記第１の接続部の下流の第２の接続部に、開放可能な分岐管が接続されており、
前記満水工程では、前記第１の弁が開けられ、前記第２の弁と前記分岐管が閉じられ、前記貯水槽に貯蔵された水が前記ポンプで前記配管に供給され、
前記排水工程では、前記第１の弁が閉じられ、前記第２の弁と前記分岐管が開かれ、前記気体供給管に接続された気体供給手段から前記配管に前記気体が供給される、請求項１に記載の配管のフラッシング方法。 A reservoir for storing water is connected to the first end of the pipe, a pump is provided downstream of the reservoir of the pipe, a first valve is provided downstream of the pump, and the first A gas supply pipe provided with a second valve is connected to the first connection part downstream of the valve, and an openable branch pipe is connected to the second connection part downstream of the first connection part. And
In the water filling step, the first valve is opened, the second valve and the branch pipe are closed, and water stored in the water storage tank is supplied to the pipe by the pump,
In the drainage step, the first valve is closed, the second valve and the branch pipe are opened, and the gas is supplied to the pipe from a gas supply means connected to the gas supply pipe. Item 2. The piping flushing method according to Item 1. 前記配管は前記第１の接続部から上方に延びる立ち上がり部を有し、前記排水工程の後、前記気体供給管に接続された排水配管から前記立ち上がり部の水が排水される、請求項２に記載の配管のフラッシング方法。   The pipe has a rising portion extending upward from the first connection portion, and the water of the rising portion is drained from a drain piping connected to the gas supply pipe after the draining step. The flushing method of piping as described. 前記配管の前記第２の接続部の下流の第２の端部に仮設管が取り付けられ、前記満水工程では前記仮設管に取り付けられた弁が閉じられ、前記排水工程では前記弁が解放される、請求項２または３に記載の配管のフラッシング方法。   A temporary pipe is attached to the second end downstream of the second connection part of the pipe, the valve attached to the temporary pipe is closed in the full process, and the valve is released in the drain process. The flushing method for piping according to claim 2 or 3. 前記気体供給管と前記気体供給手段は全ての前記排水工程が終わった後に取り外される、請求項２から４のいずれか１項に記載の配管のフラッシング方法。   The pipe flushing method according to any one of claims 2 to 4, wherein the gas supply pipe and the gas supply means are removed after all the draining steps are completed. 前記水は純水または超純水である、請求項１から５のいずれか１項に記載の配管のフラッシング方法。   The pipe flushing method according to any one of claims 1 to 5, wherein the water is pure water or ultrapure water. 薬品の製造に用いられる純水または超純水を供給する水供給システムであって、
純水または超純水が循環する閉ループをなす配管と、
前記配管に接続され、純水または超純水を貯蔵する貯水槽と、
前記配管上の前記貯水槽の下流に設けられ、前記貯水槽に貯蔵された前記純水または前記超純水を圧送するポンプと、
前記配管上の前記ポンプの下流に設けられた弁と、
前記配管上の前記弁の下流に設けられ、仮設の気体供給手段が接続されるようにされた第１の接続部と、
前記配管の前記第１の接続部の下流の第２の接続部に接続され、前記純水または前記超純水を供給するための開放可能な分岐管と、を有する、水供給システム。 A water supply system for supplying pure water or ultrapure water used in the manufacture of chemicals,
Piping that forms a closed loop through which pure water or ultrapure water circulates;
A water tank connected to the pipe for storing pure water or ultrapure water;
A pump that is provided downstream of the water tank on the pipe and pumps the pure water or the ultrapure water stored in the water tank;
A valve provided downstream of the pump on the pipe;
A first connecting portion provided downstream of the valve on the pipe and to which a temporary gas supply means is connected;
A water supply system, comprising: an openable branch pipe connected to a second connection portion downstream of the first connection portion of the pipe and supplying the pure water or the ultrapure water.
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