JP2020133677A - Flange structure for resin pipe - Google Patents

Flange structure for resin pipe Download PDF

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JP2020133677A
JP2020133677A JP2019024313A JP2019024313A JP2020133677A JP 2020133677 A JP2020133677 A JP 2020133677A JP 2019024313 A JP2019024313 A JP 2019024313A JP 2019024313 A JP2019024313 A JP 2019024313A JP 2020133677 A JP2020133677 A JP 2020133677A
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flange
pipe
resin
joints
pipe flange
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JP7225884B2 (en
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祐作 本多
Yusaku Honda
祐作 本多
小林　宙
Chu Kobayashi
宙 小林
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Sumitomo Metal Mining Co Ltd
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Abstract

To provide a flange structure for a resin pipe in which liquid leakage is unlikely to occur.SOLUTION: A flange structure for a resin pipe is configured such that two resin pipe flange joints 10, 20 facing each other are fastened with a plurality of bolts B and a plurality of nuts N screwed to the bolts. In the two opposite pipe flange joints 10, 20, in at least one of annular parts 10b, 20b on the side opposite to flange surfaces 10a, 20a, an annular washer 11 having a plurality of bolt insertion holes is concentrically provided on the pipe flange joints 10, 20, or preferably, two annular washers 11A, 11B are provided in an overlapped manner. In the latter case, the two washers are each divided into two by two surfaces that pass through a concentric axis O and intersect with each other.SELECTED DRAWING: Figure 1

Description

本発明は、液漏れの発生を抑えることが可能な樹脂製配管用のフランジ構造に関する。 The present invention relates to a flange structure for a resin pipe capable of suppressing the occurrence of liquid leakage.

ポリプロピレンなどの樹脂製配管は、軽量で耐薬品性に優れているため、様々なプラントにおいてプロセス液や廃液等の送液に多用されている。この樹脂製配管の管フランジ継手同士の結合では、一般的には相対向するフランジ面の間隙（以下、これを面間とも称する）にガスケットを挟み込んだ後、両方の管フランジ継手の複数のボルト挿通孔の各々にボルトを挿通してナットで締め付けることが行われている。 Since resin piping such as polypropylene is lightweight and has excellent chemical resistance, it is often used for sending process liquids, waste liquids, and the like in various plants. In the connection between the pipe flange joints of this resin pipe, generally, after sandwiching the gasket in the gap between the flange surfaces facing each other (hereinafter, this is also referred to as the surface), a plurality of bolts of both pipe flange joints are used. Bolts are inserted into each of the insertion holes and tightened with nuts.

その際、挟み込んだガスケットが片締めされることがないように、特許文献１に記載されているように、ガスケットの厚みを考慮した上で、これら管フランジ継手の面間をノギスにより計測しながら、これら複数のボルト・ナットをバランスよく均等に締め付けて固定することが行われる。これにより、当該ガスケットを両面から均一な面圧で密着させることができるので、内部の流体が面間から液漏れするのを防ぐことができる。 At that time, as described in Patent Document 1, the space between the surfaces of these pipe flange joints is measured with a caliper while considering the thickness of the gasket so that the sandwiched gasket is not tightened on one side. , These multiple bolts and nuts are tightened and fixed in a well-balanced and even manner. As a result, the gasket can be brought into close contact with the gasket from both sides with a uniform surface pressure, so that it is possible to prevent the fluid inside from leaking from between the surfaces.

特開２００１−２５４８７０号公報Japanese Unexamined Patent Publication No. 2001-254870

このように、樹脂製配管の管フランジ継手同士の結合では、ガスケットをその周方向に均等に締め付けることが必要になるが、この作業は作業者によるばらつきが大きく、強く締めすぎてフランジを変形させてしまい、液漏れが生じることがあった。特に、内部流体の温度が常温と６０℃程度の高温との間で昇降温を繰り返す薬液の場合は、例えばポリプロピレン製の配管では熱による膨張収縮が繰り返される結果、配管同士が接続される樹脂製のフランジ部において内部流体の液漏れが生じることがあった。この液漏れ量が多い場合は、プラントの操業を停止して補修等の作業を行う必要があるため、生産性に悪影響を及ぼすおそれがあった。 In this way, when joining the pipe flange joints of resin pipes, it is necessary to tighten the gasket evenly in the circumferential direction, but this work varies greatly depending on the operator, and it is overtightened to deform the flange. It sometimes leaked. In particular, in the case of a chemical solution in which the temperature of the internal fluid repeatedly rises and falls between a normal temperature and a high temperature of about 60 ° C. The internal fluid sometimes leaked at the flange of the pipe. If this amount of liquid leakage is large, it is necessary to stop the operation of the plant and perform work such as repair, which may adversely affect productivity.

また、樹脂製の配管系において、フランジ面同士を適切な距離で対向させる調整を行うことが難しい箇所では、一方の管フランジ継手にルーズフランジを使用することがある。この場合は、対向する両管フランジ継手のフランジ面の外縁部同士が離間することになるため、フランジ面のほぼ全面に荷重をかけて結合させる一般的なフランジ構造に比べてフランジ面の該外縁部に負荷がかかりやすく、ボルトの締付力によってはフランジ面が大きく撓んでガスケットを均等に圧縮できなくなることがあった。その結果、ガスケットが早期に劣化したり、配管のミスアライメント等が生じやすくなったりし、それらの要因でフランジ結合部に液漏れが発生することがあった。本発明は樹脂製配管系が抱える上記問題点に鑑みてなされたものであり、液漏れが生じにくい樹脂製配管用のフランジ構造を提供することを目的とする。 Further, in a resin piping system, a loose flange may be used for one of the pipe flange joints in a place where it is difficult to make adjustments so that the flange surfaces face each other at an appropriate distance. In this case, since the outer edges of the flange surfaces of the two pipe flange joints facing each other are separated from each other, the outer edge of the flange surface is compared with a general flange structure in which a load is applied to almost the entire surface of the flange surface. A load is easily applied to the portion, and depending on the tightening force of the bolt, the flange surface may be greatly bent and the gasket may not be compressed evenly. As a result, the gasket may be deteriorated at an early stage, misalignment of the piping may easily occur, and liquid leakage may occur at the flange joint due to these factors. The present invention has been made in view of the above-mentioned problems of the resin piping system, and an object of the present invention is to provide a flange structure for resin piping in which liquid leakage is unlikely to occur.

上記目的を達成するため、本発明に係る樹脂製配管用のフランジ構造は、互いに対向する２つの樹脂製の管フランジ継手同士が複数のボルト及びそれらに螺合する複数のナットで締結された樹脂製配管用フランジ構造であって、該対向する２つの管フランジ継手の少なくとも一方において、そのフランジ面とは反対側の環状部に、複数のボルト挿通孔を有する環状の座金が該管フランジ継手に同心軸状に設けられていることを特徴とする。 In order to achieve the above object, the flange structure for resin piping according to the present invention is a resin in which two resin pipe flange joints facing each other are fastened with a plurality of bolts and a plurality of nuts screwed to them. In at least one of the two opposing pipe flange joints having a flange structure for manufacturing piping, an annular seat having a plurality of bolt insertion holes is provided in the pipe flange joint on an annular portion opposite to the flange surface. It is characterized in that it is provided concentrically.

本発明によれば、変形しやすい樹脂製の管フランジ継手であってもフランジ面を撓ませることなく確実に締め付けることができる。これにより、例えば熱による収縮膨張が繰り返されるような配管系においても、液漏れの発生を抑えることができる。また、作業者の締め付け方の個人差による液漏れの発生を抑えることができる。 According to the present invention, even a easily deformable resin pipe flange joint can be reliably tightened without bending the flange surface. This makes it possible to suppress the occurrence of liquid leakage even in a piping system in which contraction and expansion due to heat are repeated, for example. In addition, it is possible to suppress the occurrence of liquid leakage due to individual differences in the tightening method of the operator.

本発明の樹脂製配管用フランジ構造の一実施形態の部分断面正面図である。It is a partial cross-sectional front view of one Embodiment of the flange structure for resin piping of this invention. 本発明の樹脂製配管用フランジ構造の他の実施形態の部分断面正面図である。It is a partial cross-sectional front view of another embodiment of the flange structure for resin piping of this invention. 本発明の樹脂製配管用フランジ構造に用いる２対の環状の座金の一具体例の平面図である。It is a top view of a specific example of two pairs of annular washers used in the flange structure for resin piping of the present invention. 管フランジ継手に図３の２対の環状の座金を取り付ける場合を示す分解斜視図である。It is an exploded perspective view which shows the case where two pairs of annular washers of FIG. 3 are attached to a pipe flange joint.

以下、図面を参照しながら本発明に係る樹脂製配管用のフランジ構造の実施形態について説明する。この本発明の実施形態のフランジ構造は、樹脂製の配管同士を接続する２つの互いに対向する樹脂製の管フランジ継手からなり、これらは周方向に等間隔に設けられた複数のボルト挿通孔に挿通された複数のボルト及びそれらに螺合する複数のナットによって締結されている。そして、これら対向する２つの管フランジ継手の少なくとも一方において、そのフランジ面（フランジシール面又はガスケット面とも称する）とは反対側の環状部に該複数のボルト挿通用の貫通孔を有する環状の座金が該管フランジ継手に同心軸状に設けられている。 Hereinafter, embodiments of a flange structure for resin piping according to the present invention will be described with reference to the drawings. The flange structure of the embodiment of the present invention comprises two opposing resin pipe flange joints connecting the resin pipes to each other, and these are provided in a plurality of bolt insertion holes provided at equal intervals in the circumferential direction. It is fastened by a plurality of bolts inserted and a plurality of nuts screwed into them. Then, in at least one of these two opposing pipe flange joints, an annular washer having a plurality of through holes for inserting bolts in an annular portion on the side opposite to the flange surface (also referred to as a flange seal surface or a gasket surface). Is provided concentrically on the pipe flange joint.

この樹脂製の配管内に例えば液温７０℃程度の硫酸等の腐食性流体が流れる場合は、施工基準等に基づいて配管材に塩ビを用いる部位では管フランジ継手に耐熱塩ビを使用するのが好ましい。この場合、より信頼性を高めるため、配管にＦＲＰライニングを施してもよい。あるいは、設備コストを抑えるため、配管及び管フランジ継手の材質にポリプロピレンを使用してもよい。 When a corrosive fluid such as sulfuric acid with a liquid temperature of about 70 ° C flows in this resin pipe, it is recommended to use heat-resistant PVC for the pipe flange joint in the part where PVC is used for the pipe material based on the construction standards. preferable. In this case, the piping may be provided with FRP lining in order to further improve reliability. Alternatively, polypropylene may be used as the material of the pipe and the pipe flange joint in order to reduce the equipment cost.

本発明の実施形態のフランジ構造が対象とする管フランジ継手のタイプについては特に限定はなく、例えば差込み溶接式フランジ、ソケット溶接式フランジ、突合せ溶接式フランジ、ねじ込み式フランジ、ルーズフランジなどに用いることができる。これらの中では、対向する２つの管フランジ継手のうちの一方において、端部にスタブエンドと称するつば状の配管継手を設け、このつば状部分にひっかけることで配管の軸方向及び周方向に移動自在なルーズフランジを採用した場合に本発明の効果をより顕著に発揮させることができる。 The type of the pipe flange joint targeted by the flange structure of the embodiment of the present invention is not particularly limited, and is used for, for example, a plug-in welding type flange, a socket welding type flange, a butt welding type flange, a screw type flange, a loose flange and the like. Can be done. Among these, in one of the two opposing pipe flange joints, a brim-shaped pipe joint called a stub end is provided at the end, and by hooking the flange-shaped part, the pipe moves in the axial direction and the circumferential direction of the pipe. When a flexible loose flange is adopted, the effect of the present invention can be exhibited more remarkably.

すなわち、ルーズフランジにおいては、フランジ面よりも該スタブエンドのつば状部分が相手側の管フランジ継手に対向する方向に突出しているので、ボルト挿通孔が設けられている周縁部は、当該相手側の管フランジ継手のフランジ面に当接させることができない。よって、これら２つの管フランジ継手間のボルト・ナット締結部分は離間しており、両フランジ面を全面に亘って当接させる構造の管フランジ継手に比べてフランジ面が変形しやすく、ボルト・ナットを許容のトルクを超えて締め付けると、該フランジ面に大きな撓みが生じる。 That is, in the loose flange, the flange-shaped portion of the stub end protrudes from the flange surface in the direction facing the pipe flange joint on the mating side, so that the peripheral portion provided with the bolt insertion hole is on the mating side. Cannot be brought into contact with the flange surface of the pipe flange joint. Therefore, the bolt / nut fastening portion between these two pipe flange joints is separated, and the flange surface is more easily deformed than the pipe flange joint having a structure in which both flange surfaces are brought into contact with each other over the entire surface, and the bolt / nut When tightened beyond the allowable torque, a large amount of bending occurs on the flange surface.

管フランジ継手において、このフランジ面はガスケットが当接するフランジシール面であるため、上記のようにこの部分に撓みが生じると、当該ガスケットを全面に亘って均等に圧縮するのが困難になる。その結果、ガスケットが早期に劣化したり、配管のミスアライメント等が生じたりし、それらを要因とする液漏れが発生しやすくなる。なお、上記のフランジ面の撓みの問題は、上記ルーズフランジだけの問題ではなく、平面座（レイズドフェイス）などのように締結時にフランジの周縁部が離間するものであれば同様の問題が生じうる。 In a pipe flange joint, since this flange surface is a flange seal surface to which the gasket abuts, if bending occurs in this portion as described above, it becomes difficult to evenly compress the gasket over the entire surface. As a result, the gasket deteriorates at an early stage, misalignment of the piping, etc. occurs, and liquid leakage due to these causes is likely to occur. The problem of bending of the flange surface is not limited to the loose flange, but the same problem may occur if the peripheral edges of the flange are separated at the time of fastening, such as a flat seat (raised face). ..

そこで、本発明の実施形態のフランジ構造は、図１に示すように、対向する２つの管フランジ継手１０、２０において、そのフランジ面１０ａ、２０ａとは反対側の環状部１０ｂ、２０ｂの少なくとも一方に、複数のボルトＢ挿通用の貫通孔を有する環状の座金１１が該管フランジ継手１０、２０に同心軸上に設けられている。これにより、これら複数のボルトＢ及びこれらに螺合する複数のナットＮで管フランジ継手１０、２０を締結する際、これらフランジ面１０ａ、２０ａが撓むのを抑えることができ、よってフランジ結合部からの液漏れの問題が生じにくくなる。 Therefore, in the flange structure of the embodiment of the present invention, as shown in FIG. 1, in two pipe flange joints 10 and 20 facing each other, at least one of the annular portions 10b and 20b on the opposite sides of the flange surfaces 10a and 20a. An annular washer 11 having through holes for inserting a plurality of bolts B is provided on the pipe flange joints 10 and 20 on a concentric shaft. As a result, when the pipe flange joints 10 and 20 are fastened with the plurality of bolts B and the plurality of nuts N screwed thereto, it is possible to prevent the flange surfaces 10a and 20a from bending, and thus the flange joint portion. The problem of liquid leakage from the flange is less likely to occur.

本発明の実施形態のフランジ構造においては、上記環状の座金を既設の配管系の管フランジ継手にも容易に組み込むことができるように、その中心軸を通る面で２分割された１対の分割片で構成してもよい。この場合、２対の分割片を重ね合せて設けるのが好ましい。例えば、図２に示す本発明の他の実施形態のように、一方の管フランジ継手に２対の環状の座金１１Ａ、１１Ｂを重ね合せて設けると共に、他方の管フランジ継手にも環状の座金１１Ａ、１１Ｂを重ね合せて設けてもよいし、どちらか一方の管フランジ継手のみに２対の環状の座金１１Ａ、１１Ｂを重ね合せて設けてもよい。 In the flange structure of the embodiment of the present invention, the annular washer is divided into two pairs on the surface passing through the central axis so that the annular washer can be easily incorporated into the pipe flange joint of the existing piping system. It may be composed of pieces. In this case, it is preferable to provide two pairs of divided pieces in an overlapping manner. For example, as in another embodiment of the present invention shown in FIG. 2, two pairs of annular washers 11A and 11B are provided on one pipe flange joint in an overlapping manner, and the other pipe flange joint is also provided with an annular washer 11A. , 11B may be provided in an overlapping manner, or two pairs of annular washers 11A and 11B may be provided in an overlapping manner only on one of the pipe flange joints.

更に、これら座金１１Ａ、１１Ｂを２枚重ね合せて管フランジ継手に設ける際、該管フランジ継手の軸方向から見て上記分割面が一致しないのが好ましい。すなわち、座金１１Ａ、１１Ｂは管フランジ継手の同心軸Ｏを通る互いに交差する２つの面でそれぞれ２分割されているようにセットするのが好ましい。この場合、上記の２つの面が交差する角度には特に限定はなく、各管フランジ継手に設けられているボルト挿通孔の個数や、管フランジ継手の呼び径等を考慮して適宜定められるが、一般的には図３に示すように直角に交差させることが好ましい。 Further, when two washers 11A and 11B are superposed and provided on the pipe flange joint, it is preferable that the divided surfaces do not match when viewed from the axial direction of the pipe flange joint. That is, it is preferable that the washers 11A and 11B are set so as to be divided into two by two intersecting surfaces passing through the concentric shaft O of the pipe flange joint. In this case, the angle at which the above two surfaces intersect is not particularly limited, and is appropriately determined in consideration of the number of bolt insertion holes provided in each pipe flange joint, the nominal diameter of the pipe flange joint, and the like. Generally, it is preferable to intersect at right angles as shown in FIG.

上記のように、分割片からなる環状の座金を用いる場合、２対の分割片からなる環状の座金をそれらの分割面が一致しないように重ね合せて使用する理由は、それらの分割面がフランジ面の周方向において一致すると、両管フランジ継手同士を周方向に均一に締め付けにくくなり、片締めによる液漏れが発生しやすくなるからである。 As described above, when an annular washer composed of divided pieces is used, the reason why the annular washer composed of two pairs of divided pieces is used so as not to coincide with the divided surfaces is that the divided surfaces are flanged. This is because if they match in the circumferential direction of the surfaces, it becomes difficult to uniformly tighten the flange joints of both pipes in the circumferential direction, and liquid leakage due to one-sided tightening is likely to occur.

本発明の実施形態のフランジ構造が対象とする管フランジ継手は、呼び径が２５Ａ以上８０Ａ以下であるのが好ましい。この呼び径が２５Ａ未満あるいは８０Ａを超える場合は、配管のアライメントの調整が難しくなるのでかえって液漏れが生じるおそれがある。また、本発明のフランジ構造で用いる環状の座金の材質は、配管系内において腐食性の薬液を取り扱う場合が多いので、ＳＵＳ３０４やＳＵＳ３１６などのステンレス系鋼板を打ち抜いたものを用いるのが好ましい。また、該環状の座金の厚みには特に限定がないが、２ｍｍ以上５ｍｍ以下が好ましい。この厚みが２ｍｍ未満では容易に変形して本発明の効果を良好に奏さなくなるおそれがあり、逆に５ｍｍを超えると強度が必要以上に高くなるので不経済になる。 The pipe flange joint targeted by the flange structure of the embodiment of the present invention preferably has a nominal diameter of 25 A or more and 80 A or less. If the nominal diameter is less than 25A or more than 80A, it becomes difficult to adjust the alignment of the piping, so that there is a risk of liquid leakage. Further, as the material of the annular washer used in the flange structure of the present invention, since corrosive chemicals are often handled in the piping system, it is preferable to use a punched stainless steel plate such as SUS304 or SUS316. The thickness of the annular washer is not particularly limited, but is preferably 2 mm or more and 5 mm or less. If this thickness is less than 2 mm, it may be easily deformed and the effect of the present invention may not be exhibited satisfactorily. On the contrary, if it exceeds 5 mm, the strength becomes higher than necessary, which is uneconomical.

本発明の実施形態のフランジ構造においては、両管フランジ継手をボルト、ナットで締め付ける時の締付トルクが１０Ｎ・ｍ以下であるのが好ましい。この締付トルクが１０Ｎ・ｍを超えると、上記環状の座金を設けてもフランジが変形して液漏れが生ずるおそれがある。 In the flange structure of the embodiment of the present invention, the tightening torque when tightening both pipe flange joints with bolts and nuts is preferably 10 Nm or less. If this tightening torque exceeds 10 Nm, the flange may be deformed and liquid leakage may occur even if the annular washer is provided.

このように、本発明の樹脂製配管フランジ機構を用いることで、フランジ面を変形させることなく周方向に均等にフランジを締め付けることが可能になり、よって熱による膨張収縮を繰り返すフランジ結合部であっても、液漏れを生じにくくすることができる。特に、通液温度が昇降温を繰り返す配管系にポリプロピレン製のルーズフランジを用いる場合、配管のミスアライメントやガスケットの早期劣化が生じやすいが、その場合であっても短時間で座金を取り付けることができ、以降は液漏れを止めることができる。次に、実施例及び比較例を挙げて本発明をより具体的に説明するが、本発明はかかる実施例等に限定されるものではない。 As described above, by using the resin piping flange mechanism of the present invention, it is possible to tighten the flange evenly in the circumferential direction without deforming the flange surface, and thus it is a flange joint portion that repeats expansion and contraction due to heat. However, it is possible to prevent liquid leakage. In particular, when a polypropylene loose flange is used for a piping system in which the liquid passing temperature repeatedly rises and falls, misalignment of the piping and early deterioration of the gasket are likely to occur, but even in that case, the washer can be attached in a short time. After that, the liquid leakage can be stopped. Next, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to such Examples and the like.

＜実施例＞
配管内を流れる薬液の温度が３０〜６５℃の間で周期的に変化する既設の湿式化学反応プラントの配管系のうち、１か所の管フランジ継手同士の結合部に、図３に示すような各々中心軸を通る面で２分割されたステンレス製の環状の座金を、２枚重ねて設けてその効果を評価した。この互いに対向する２つの管フランジ継手は、上側がポリプロピレン製の呼び径５０Ａからなり、下側はポリエチレン製の呼び径５０Ａのルーズフランジが使用されていた。 <Example>
As shown in FIG. 3, in the piping system of an existing wet chemical reaction plant in which the temperature of the chemical solution flowing in the pipe periodically changes between 30 and 65 ° C., one pipe flange joint is connected to each other. Two stainless steel annular washers divided into two on the surface passing through the central axis were provided in layers to evaluate the effect. In the two pipe flange joints facing each other, a loose flange having a nominal diameter of 50 A made of polypropylene was used on the upper side and a loose flange having a nominal diameter of 50 A made of polyethylene was used on the lower side.

上記の座金の取り付けの際は、先ず既に締結されているボルト、ナットを外した後、図４に示すように、上側の管フランジ継手１０のフランジ面１０ａとは反対側の環状部１０ｂに上記２分割された２対の環状の座金（外径１５５ｍｍ、内径１００ｍｍ、厚み３ｍｍ、ボルト径１９ｍｍ）１１Ａ、１１Ｂを、該管フランジ継手１０の中心軸Ｏ方向から見て各々の分割面が直交するように組み込んだ。なお、下側の管フランジ継手２０には上記環状の座金は組み込まなかった。その後、これら管フランジ継手１０、２０のフランジ面間のアライメントがフランジの周方向に均一になるようにノギスで調整しながらボルト・ナットの締め込みを行った。 When attaching the washer, first remove the bolts and nuts that have already been fastened, and then, as shown in FIG. 4, the above-mentioned annular portion 10b on the side opposite to the flange surface 10a of the upper pipe flange joint 10. Two pairs of annular washers (outer diameter 155 mm, inner diameter 100 mm, thickness 3 mm, bolt diameter 19 mm) 11A and 11B divided into two are orthogonal to each other when viewed from the central axis O direction of the pipe flange joint 10. Incorporated as. The annular washer was not incorporated in the lower pipe flange joint 20. After that, the bolts and nuts were tightened while adjusting with a caliper so that the alignment between the flange surfaces of the pipe flange joints 10 and 20 was uniform in the circumferential direction of the flange.

このように、一般的な工具であるレンチでボルト・ナットを取り外してガスケットを交換すると共に環状の座金を２枚重ね合せて取り付けた後、ボルトを挿通してノギスで面間のアライメントを調整しながらレンチで所定のトルクで締め付けるだけの単純な作業であるため、作業時間は約２０分であった。その後、配管系に薬液（６０℃の硫酸）を通液し、管フランジ継手の結合部からの液漏れの有無を確認したところ、液漏れは認められなかった。このように２分割された環状の座金を２枚重ね合せて取り付けることで、アライメント調整のみにより液漏れを止めることができた。 In this way, after removing the bolts and nuts with a wrench, which is a general tool, and replacing the gasket, and attaching two annular washers on top of each other, insert the bolts and adjust the alignment between the surfaces with a caliper. However, since the work was as simple as tightening with a wrench to a predetermined torque, the work time was about 20 minutes. After that, a chemical solution (sulfuric acid at 60 ° C.) was passed through the piping system, and the presence or absence of liquid leakage from the joint portion of the pipe flange joint was confirmed. As a result, no liquid leakage was observed. By superimposing and attaching two annular washers divided into two in this way, it was possible to stop liquid leakage only by adjusting the alignment.

＜比較例＞
上記実施例の２分割された環状の座金を用いない以外は上記実施例と同様の管フランジ継手の結合部が６０か所存在する既設の湿式化学反応プラントの配管系に対して薬液を通液したところ、周期的な熱膨張・熱収縮により該６０か所のフランジ結合部の内、２０か所から薬液の液漏れが発生した。 <Comparison example>
A chemical solution is passed through the piping system of an existing wet chemical reaction plant in which there are 60 joints of pipe flange joints similar to those in the above embodiment except that the two-divided annular washer of the above embodiment is not used. As a result, the chemical liquid leaked from 20 of the 60 flange joints due to periodic thermal expansion and contraction.

Ｂ ボルト
Ｎ ナット
１０、２０ 管フランジ継手
１０ａ、２０ａ ガスケット面
１０ｂ、２０ｂ 環状部
１１、１１Ａ、１１Ｂ 座金 B Bolt N Nut 10, 20 Pipe Flange Joint 10a, 20a Gasket Surface 10b, 20b Ring Part 11, 11A, 11B Washer

Claims (5)

互いに対向する２つの樹脂製の管フランジ継手同士が複数のボルト及びそれらに螺合する複数のナットで締結された樹脂製配管用フランジ構造であって、該対向する２つの管フランジ継手の少なくとも一方において、そのフランジ面とは反対側の環状部に、複数のボルト挿通孔を有する環状の座金が該管フランジ継手に同心軸状に設けられていることを特徴とする樹脂製配管用フランジ構造。 A flange structure for resin piping in which two resin pipe flange joints facing each other are fastened with a plurality of bolts and a plurality of nuts screwed onto them, and at least one of the two facing pipe flange joints. The resin-made flange structure for piping, wherein an annular seat having a plurality of bolt insertion holes is provided concentrically in the pipe flange joint in an annular portion on the opposite side of the flange surface. 前記管フランジ継手に対して前記環状の座金が２枚重ね合せて設けられており、これら２枚の座金は前記同心軸を通る互いに交差する２つの面でそれぞれ２分割されていることを特徴とする、請求項１に記載の樹脂製配管用フランジ構造。 Two of the annular washers are superposed on the pipe flange joint, and these two washers are each divided into two by two intersecting surfaces passing through the concentric axes. The resin piping flange structure according to claim 1. 前記交差が直交であることを特徴とする、請求項２に記載の樹脂製配管用フランジ構造。 The resin piping flange structure according to claim 2, wherein the intersections are orthogonal to each other. 前記樹脂がポリプロピレンであることを特徴とする、請求項１から３のいずれか１項に記載の樹脂製配管用フランジ構造。 The resin piping flange structure according to any one of claims 1 to 3, wherein the resin is polypropylene. 前記対向する２つの管フランジ継手のうちの一方がルーズフランジであることを特徴とする、請求項１から４のいずれか１項に記載の樹脂製配管用フランジ構造。 The resin piping flange structure according to any one of claims 1 to 4, wherein one of the two opposing pipe flange joints is a loose flange.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6031579U (en) * 1983-08-10 1985-03-04 三菱電線工業株式会社 Plastic pipe flange connection structure
JPS62207628A (en) * 1986-03-06 1987-09-12 Sekisui Chem Co Ltd Manufacture of flanged thermoplastic resin pipe joint
JPH1130381A (en) * 1997-05-16 1999-02-02 Sekisui Chem Co Ltd Connecting structure of branch joint and apparatus for water supply
JP2001241790A (en) * 2000-03-01 2001-09-07 Sumitomo Heavy Ind Ltd Flange type fixing structure and cryogenic refrigerator having the same
US6948717B1 (en) * 1994-07-13 2005-09-27 Kc Multi-Ring Products, Inc. Joint assembly employing multi-ring gasket
JP2011017384A (en) * 2009-07-09 2011-01-27 Ck Metals Co Ltd Connecting structure of piping using loose-fit type flange
JP2012117610A (en) * 2010-12-01 2012-06-21 Sekisui Chem Co Ltd Connecting structure of piping material
US20140265325A1 (en) * 2013-03-15 2014-09-18 Crane Chempharma Resistoflex Wave washer, method of manufacture, method of use, and pipe joint using same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6031579U (en) * 1983-08-10 1985-03-04 三菱電線工業株式会社 Plastic pipe flange connection structure
JPS62207628A (en) * 1986-03-06 1987-09-12 Sekisui Chem Co Ltd Manufacture of flanged thermoplastic resin pipe joint
US6948717B1 (en) * 1994-07-13 2005-09-27 Kc Multi-Ring Products, Inc. Joint assembly employing multi-ring gasket
JPH1130381A (en) * 1997-05-16 1999-02-02 Sekisui Chem Co Ltd Connecting structure of branch joint and apparatus for water supply
JP2001241790A (en) * 2000-03-01 2001-09-07 Sumitomo Heavy Ind Ltd Flange type fixing structure and cryogenic refrigerator having the same
JP2011017384A (en) * 2009-07-09 2011-01-27 Ck Metals Co Ltd Connecting structure of piping using loose-fit type flange
JP2012117610A (en) * 2010-12-01 2012-06-21 Sekisui Chem Co Ltd Connecting structure of piping material
US20140265325A1 (en) * 2013-03-15 2014-09-18 Crane Chempharma Resistoflex Wave washer, method of manufacture, method of use, and pipe joint using same

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