JPS6254353B2 - - Google Patents
Info
- Publication number
- JPS6254353B2 JPS6254353B2 JP57018716A JP1871682A JPS6254353B2 JP S6254353 B2 JPS6254353 B2 JP S6254353B2 JP 57018716 A JP57018716 A JP 57018716A JP 1871682 A JP1871682 A JP 1871682A JP S6254353 B2 JPS6254353 B2 JP S6254353B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- less
- corrosion
- casing
- bell mouth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005260 corrosion Methods 0.000 claims description 13
- 230000007797 corrosion Effects 0.000 claims description 12
- 239000004793 Polystyrene Substances 0.000 claims description 8
- 229920002223 polystyrene Polymers 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 7
- 239000011701 zinc Substances 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- 239000010419 fine particle Substances 0.000 claims description 6
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000000576 coating method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
- Sealing Material Composition (AREA)
- Paints Or Removers (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は揚水管たとえば海水揚水用の斜流ポン
プ、深井戸ポンプ、水中ポンプ等のベルマウス部
分などのすきまの防食法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for preventing corrosion of gaps in bell mouths of pumping pipes, such as mixed flow pumps for seawater pumping, deep well pumps, submersible pumps, and the like.
従来、揚水用ポンプのベルマウスは鋳鉄や鋼鋳
物あるいはステンレス鋼で製作し、これらは第１
図に示すように、羽根車１を内装したケーシング
２にゴム質や合成樹脂、あるいは石綿等のシール
材を介して、ベルマウス３とケーシング２のフラ
ンジ部分をボルト締結している。
Conventionally, the bell mouth of a water pump is made of cast iron, steel casting, or stainless steel, and these are the first
As shown in the figure, a bell mouth 3 and a flange portion of the casing 2 are bolted to a casing 2 containing an impeller 1 through a sealing material such as rubber, synthetic resin, or asbestos.
しかし、これらのベルマウス３とケーシング２
の接続部、あるいは接触によりすきまを構成して
いる部分にすきま腐食が発生することがある。 However, these bell mouth 3 and casing 2
Crevice corrosion may occur at the joints or in the parts that form gaps due to contact.
この部分にすきま腐食を発生すると、すきまの
シールが不十分となり、流体がその部分から洩れ
るためにポンプの揚水能力が低下する。 When crevice corrosion occurs in this part, the sealing of the crevice becomes insufficient and fluid leaks from that part, reducing the pump's pumping capacity.
すきまを封じる手段としては溶接等によりすき
まをなくす試みもなされたが、その場合には溶接
熱影響部が粒界腐食等の選択的な腐食を発生する
等の問題がある。 As a means of sealing the gap, attempts have been made to eliminate the gap by welding or the like, but in this case there are problems such as selective corrosion such as intergranular corrosion occurring in the weld heat affected zone.
本発明は上記に鑑みてなしたもので揚水管たと
えば揚水ポンプのベルマウスとケーシングの接続
部等のすきま腐食防止法を提供することを目的と
する。
The present invention has been made in view of the above, and an object of the present invention is to provide a method for preventing crevice corrosion in a water pump, such as a connection between a bell mouth and a casing of a water pump.
本発明はＣ；３重量％以下、Si；３重量％以
下、Mn；５重量％以下、Cr；30重量％以下、
Ni；25重量％以下、残部Feとからなる鉄系合金
から構成する揚水管の接続部のすきま部分にシロ
キサン樹脂を混合したポリスチレン100に対し、
亜鉛微粒子；30〜200重量％均一分散した混合物
を塗布するものである。
The present invention includes C: 3% by weight or less, Si: 3% by weight or less, Mn: 5% by weight or less, Cr: 30% by weight or less,
For polystyrene 100 mixed with siloxane resin in the gap part of the connection part of the lifting pipe, which is made of an iron-based alloy consisting of Ni; 25% by weight or less and the balance Fe,
Zinc fine particles: A uniformly dispersed mixture of 30 to 200% by weight is applied.
シロキサン樹脂はグリース性能があり、その添
加量が３重量％以下は可塑性が悪く、又、25重量
％以上ではポリスチレンの吸湿性が悪く、このた
め亜鉛の犠牲陽極作用が低下するので３〜25重量
％望ましい。 Siloxane resin has grease properties, and if the amount added is less than 3% by weight, the plasticity is poor, and if it is more than 25% by weight, the hygroscopicity of polystyrene is poor, and the sacrificial anode effect of zinc is reduced. %desirable.
亜鉛微粒子は30重量％以下では防食効果がな
く、200重量％以上では塗布後脱落しやすく、又
作業性が悪くなるので30〜200重量％に限定し
た。 If the zinc fine particles are less than 30% by weight, they have no anticorrosion effect, and if they are more than 200% by weight, they tend to fall off after coating, and workability becomes poor, so the content was limited to 30 to 200% by weight.
以下第２図によつて本発明の実施例を説明す
る。
An embodiment of the present invention will be described below with reference to FIG.
ケーシング２とベルマウス３及びケーシング２
同士の接続部４のすきま、ならびにシールリン
グ、シートパツキング部、およびフランジのボル
ト締付部分には、シロキサン樹脂；11重量％を混
合したポリスチレンを塗布し、接続シールしたも
のである。 Casing 2, bell mouth 3 and casing 2
The gaps between the connection parts 4, the seal ring, the seat packing part, and the bolt tightening part of the flange are coated with polystyrene mixed with 11% by weight of siloxane resin to seal the connection.
本発明にかかわるポリスチレン100に対し亜鉛
微粒子；30〜200重量％が分散されており、若干
の石英微粉末を含むものである。これらを塗布し
たすきまにおいては亜鉛微粒子は水と積極的に反
応して溶解し、アノード分極し、すきま内表面を
防食する。 Zinc fine particles; 30 to 200% by weight are dispersed in the polystyrene 100 according to the present invention, and some quartz fine powder is also included. In the gaps where these coatings are applied, the zinc fine particles actively react with water, dissolve, anode polarize, and protect the inner surfaces of the gaps from corrosion.
その生成した非晶質の水酸化物は、すきま内表
面の腐食防止作用を長期間維持する。 The amorphous hydroxide thus produced maintains its anti-corrosion effect on the inner surface of the crevice for a long period of time.
ここで、ポリスチレンは防食上、有効な非晶質
の水酸化亜鉛を塗布層内に長期間維持するために
必要である。 Here, polystyrene is necessary for corrosion prevention and for maintaining effective amorphous zinc hydroxide in the coating layer for a long period of time.
これら非晶質の水酸化物はすきま内の液質を若
干アルカリ性とし、ポリスチレンにより構成され
た微細な空孔に滞留して防食性を維持する。 These amorphous hydroxides make the liquid in the gap slightly alkaline and remain in the fine pores made of polystyrene to maintain corrosion resistance.
シロキサン樹脂はポリスチレン中の亜鉛微粒子
を均一分散させて、その状態を長期間維持するた
めに必要である。 Siloxane resin is necessary to uniformly disperse zinc fine particles in polystyrene and maintain this state for a long period of time.
金属内表面、シール材に前記混合物を塗布した
後、ケーシング２とベルマウス３のフランジなど
をボルトにより締結することにより接続ならびに
シーリングするがボルトで締結する際、ボルトな
らびにボルト孔に前記混合物を塗布してから締結
する。 After applying the mixture to the inner surface of the metal and the sealing material, the flanges of the casing 2 and bell mouth 3 are connected and sealed by tightening them with bolts. When tightening with bolts, apply the mixture to the bolts and bolt holes. Then conclude the contract.
これにより、ケーシング２とベルマウス３の接
続部のすきま内表面のすきま腐食は防止される。 This prevents crevice corrosion on the inner surface of the crevice at the connection between the casing 2 and the bell mouth 3.
また、ケーシング２とベルマウス３のフランジ
部分のボルト締結部分も同様に防食される。 Further, the bolted portions of the flange portions of the casing 2 and the bell mouth 3 are also protected from corrosion.
これらの防食効果が適用される金属材料として
は、Ｃ：３重量％以下、Si：３重量％以下、
Mn：５重量％以下、Cr：30重量％以下、Ni：25
重量％以下で、その他取除くことが出来ない不純
物と残部Feとからなる鉄合金である。 Metal materials to which these anticorrosion effects are applied include C: 3% by weight or less, Si: 3% by weight or less,
Mn: 5% by weight or less, Cr: 30% by weight or less, Ni: 25
It is an iron alloy consisting of other impurities that cannot be removed and the balance is Fe in a weight percent or less.
以上説明したように本発明によれば揚水管たと
えば揚水ポンプのベルマウスとケーシングの接続
部分およびボルト締結部分のすきま腐食を防止す
ることができる。
As explained above, according to the present invention, it is possible to prevent crevice corrosion in the connection portion between the bell mouth of a water pump, for example, and the casing, and the bolted portion.
第１図は従来の揚水ポンプの縦断面図、第２図
は本発明のすきま腐食防止を施した揚水ポンプの
縦断面図である。
１…羽根車、２…ケーシング、３…ベルマウ
ス、４…フランジ、５…防食材の塗布部分。
FIG. 1 is a longitudinal cross-sectional view of a conventional water pump, and FIG. 2 is a longitudinal cross-sectional view of a water pump provided with crevice corrosion prevention according to the present invention. 1... impeller, 2... casing, 3... bell mouth, 4... flange, 5... anticorrosive coating area.
Claims (1)
Mn：５重量％以下、Cr：30重量％以下、Ni：25
重量％以下、残部Feとからなる鉄系合金から構
成する揚水管の接続部のすきま部分に、シロキサ
ン樹脂を混合したポリスチレンに対し亜鉛微粒
子；30〜200重量％分散した混合物を塗布するこ
とを特徴とする揚水管のすきま腐食防止法。1 C: 3% by weight or less, Si: 3% by weight or less,
Mn: 5% by weight or less, Cr: 30% by weight or less, Ni: 25
A mixture of zinc fine particles dispersed in polystyrene mixed with siloxane resin in an amount of 30 to 200% by weight is applied to the gap between the joints of a lift pipe made of an iron-based alloy with the balance being Fe. A method for preventing crevice corrosion in pumping pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57018716A JPS58136665A (en) | 1982-02-10 | 1982-02-10 | Prevention of crevice corrosion of water pumping-up pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57018716A JPS58136665A (en) | 1982-02-10 | 1982-02-10 | Prevention of crevice corrosion of water pumping-up pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58136665A JPS58136665A (en) | 1983-08-13 |
| JPS6254353B2 true JPS6254353B2 (en) | 1987-11-14 |
Family
ID=11979376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57018716A Granted JPS58136665A (en) | 1982-02-10 | 1982-02-10 | Prevention of crevice corrosion of water pumping-up pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58136665A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62171587A (en) * | 1986-01-23 | 1987-07-28 | 三菱重工業株式会社 | Packing material for flange coupling |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5448830A (en) * | 1977-09-24 | 1979-04-17 | Kansai Paint Co Ltd | Resin composition for corrosion preventing coating |
-
1982
- 1982-02-10 JP JP57018716A patent/JPS58136665A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5448830A (en) * | 1977-09-24 | 1979-04-17 | Kansai Paint Co Ltd | Resin composition for corrosion preventing coating |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58136665A (en) | 1983-08-13 |
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