JPH01296097A - Heat transfer tube for electric corrosion-preventing type heat exchanger, whose inner surface is coated with coating film - Google Patents
Heat transfer tube for electric corrosion-preventing type heat exchanger, whose inner surface is coated with coating filmInfo
- Publication number
- JPH01296097A JPH01296097A JP12498588A JP12498588A JPH01296097A JP H01296097 A JPH01296097 A JP H01296097A JP 12498588 A JP12498588 A JP 12498588A JP 12498588 A JP12498588 A JP 12498588A JP H01296097 A JPH01296097 A JP H01296097A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- heat exchanger
- coating film
- heat transfer
- heat
- 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.)
- Pending
Links
- 239000011248 coating agent Substances 0.000 title claims abstract description 33
- 238000000576 coating method Methods 0.000 title claims abstract description 33
- 238000005260 corrosion Methods 0.000 claims description 15
- 230000007797 corrosion Effects 0.000 claims description 13
- 239000000088 plastic resin Substances 0.000 claims description 3
- 229910000936 Naval brass Inorganic materials 0.000 abstract description 6
- 229910001369 Brass Inorganic materials 0.000 abstract description 4
- 239000010951 brass Substances 0.000 abstract description 4
- 239000003973 paint Substances 0.000 abstract description 3
- 229920001225 polyester resin Polymers 0.000 abstract description 3
- 239000004645 polyester resin Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 229920001296 polysiloxane Polymers 0.000 abstract description 2
- 238000005536 corrosion prevention Methods 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 229920005992 thermoplastic resin Polymers 0.000 abstract 1
- 229920005989 resin Polymers 0.000 description 15
- 239000011347 resin Substances 0.000 description 15
- 238000004210 cathodic protection Methods 0.000 description 9
- 239000013535 sea water Substances 0.000 description 5
- -1 Polypropylene Polymers 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 229940075397 calomel Drugs 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical compound Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920006350 polyacrylonitrile resin Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920006380 polyphenylene oxide Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
- F28F19/04—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of rubber; of plastics material; of varnish
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
- F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は海水あるいは河川水などを冷却水とする熱交換
器用内面塗膜付伝熱管に関し、特に耐食性及び耐電気防
食性等を改善したものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat exchanger tube with an inner coated film for use in a heat exchanger that uses seawater or river water as cooling water, and in particular has improved corrosion resistance and electrolytic corrosion resistance. It is.
（従来の技術）
一般に火力もしくは原子力発電所、化学工場、船舶又は
その他の各種熱交換器としては相対した管板のそれぞれ
に第２図に示すような貫通孔（４）を多数設け、それぞ
れの相対する貫通孔（４）に伝熱管（１）をその両端部
を挿入して拡管することにより多数装着したものであり
、該伝熱管としては通常鋼又は銅合金管が使用されてい
る。(Prior art) In general, in heat exchangers for thermal or nuclear power plants, chemical factories, ships, and other various types of heat exchangers, a large number of through holes (4) as shown in Fig. 2 are provided in each of the opposed tube sheets. A large number of heat transfer tubes (1) are installed by inserting both ends of the heat transfer tubes (1) into opposing through holes (4) and expanding the tubes, and steel or copper alloy tubes are usually used as the heat transfer tubes.
ところが我国においては、このような熱交換器の冷却水
としては海水を用いることが多く、伝熱管には種々の腐
食が発生していた。However, in Japan, seawater is often used as cooling water for such heat exchangers, and various types of corrosion have occurred in the heat exchanger tubes.
そこでこの腐食を防止するため最近、管の内面に塗膜を
形成した伝熱管が使用され始めている。To prevent this corrosion, heat transfer tubes with a coating formed on the inner surface of the tubes have recently begun to be used.
上記従来の熱交換管にあっては、管板および伝熱管管端
部の防食のために、通常電気防食装置が取り付けられて
いるが、そのような電気防食環境下においては管内面の
塗膜が膨れて剥離し、耐食性が低下するという問題があ
った。In the conventional heat exchange tubes mentioned above, a cathodic protection device is usually installed to prevent corrosion on the tube sheet and the ends of the heat exchanger tubes, but in such a cathodic protection environment, the coating film on the inner surface of the tube There was a problem that the corrosion resistance deteriorated due to swelling and peeling.
即ち一般に管板や従来の内面塗装等のされていない伝熱
管の管端部を防食するためには上記のように電気防食が
必要である。That is, in general, cathodic protection is required as described above in order to prevent corrosion of tube sheets and tube ends of heat exchanger tubes that are not coated with conventional inner surface coating.
ところが内面塗膜付伝熱管を使用するときは、全長にわ
たって塗膜が形成されていれば、管端部も十分に防食さ
れるため、電気防食は必要としないことになる。しかし
既に装着されている塗膜のない伝熱管に部分的な補修管
として内面塗膜付伝熱管を取付けた場合にはこの内面塗
膜付伝熱管に塗膜のない伝熱管の防食のための電気防食
作用が付加されることになり該内面塗膜付伝熱管の管端
部塗膜に膨れや剥離が生じてしまう。However, when using a heat exchanger tube with an internal coating, if the coating is formed over the entire length, the ends of the tube will also be sufficiently protected from corrosion, so cathodic protection is not required. However, when a heat exchanger tube with an inner surface coating is installed as a partial repair tube to an already installed heat exchanger tube without a coating film, the heat exchanger tube with an inner surface coating film is used to prevent corrosion of the heat exchanger tube without a coating film. As a result of the addition of cathodic protection, blistering and peeling occur in the tube end coating of the heat exchanger tube with an inner coating.
また、内面塗膜を全長にわたって形成した伝熱管だけを
管板に装着した熱交換器においても管板の防食のために
は電気防食法が行なわれており、伝熱管の内面塗膜の膨
れや剥離は常に発生していた。In addition, even in heat exchangers in which only heat exchanger tubes with an inner coating film formed over the entire length are attached to the tube sheet, cathodic protection is carried out to prevent corrosion of the tube sheet, and the inner coating film of the heat exchanger tubes is prevented from blistering. Delamination was always occurring.
本発明はこれに鑑み種々検討の結果、電気防食による内
面塗膜の膨れや剥離を防止した熱交換器用の内面塗膜付
伝熱管を開発したものでおる。In view of this, as a result of various studies, the present invention has developed a heat exchanger tube with an inner coating for use in a heat exchanger that prevents blistering and peeling of the inner coating due to cathodic protection.
即ち本発明は相対した管板に多数の貫通孔を設け、それ
ぞれの相対する貫通孔に、両端部を挿入して拡管するこ
とにより管板に装着する内面塗膜付伝熱管において、該
両端部の外面を絶縁性の熱収縮チューブで覆って管板の
貫通孔に挿入・拡管したことを特徴とするものである。That is, the present invention provides a heat exchanger tube with an inner surface coated film that is attached to a tube sheet by providing a large number of through holes in opposing tube sheets, and inserting both ends into each opposing through hole and expanding the tube. The outer surface of the tube is covered with an insulating heat-shrinkable tube, and the tube is inserted into a through hole in the tube sheet and expanded.
そして伝熱管の両端からそれぞれ３０００ａｎ以内の範
囲の外面を絶縁性の熱収縮チューブで覆うのが効果的で
あり、また伝熱管の外面を覆う絶縁性の熱収縮チューブ
の厚さは３００μｍ以下が良い。It is effective to cover the outer surface within 3000 an of each end of the heat transfer tube with an insulating heat shrink tube, and the thickness of the insulating heat shrink tube that covers the outer surface of the heat transfer tube is preferably 300 μm or less. .
ざらに絶縁性の熱収縮チューブの管径方向の収縮率が５
〜５０％が有効であり、絶縁性の熱収縮チューブとして
は前回塑性樹脂を用いるのが良い。The shrinkage rate of roughly insulating heat shrink tubing in the radial direction is 5.
~50% is effective, and it is better to use plastic resin as the insulating heat shrink tube.
このように内面塗膜付伝熱管の管端部外面を熱収縮チュ
ーブで被覆して拡管装着することにより、内面塗膜付伝
熱管を電気的に絶縁した状態で装着することができ、電
気防食の影響を受けず、管端部塗膜の膨れや剥離が防止
できる利点を有する。By covering the outer surface of the tube end of the heat exchanger tube with an inner coating film with a heat shrink tube and expanding the tube, the heat exchanger tube with an inner coating film can be installed in an electrically insulated state, and it is possible to prevent cathodic corrosion. It has the advantage of being able to prevent blistering and peeling of the coating film at the end of the pipe.
また外面を被覆する熱収縮チューブの管径方向の収縮率
を５〜５０％に限定した理由は管外面との密着をより強
固にするためである。すなわち、管径方向の収縮率が５
％未満であれば、管外面との間に隙間がおいて密着性が
悪くなり、管径方向の収縮率が５０％を超えると、ひび
割れを起こして密着性が悪くなるからである。Further, the reason why the shrinkage rate in the tube diameter direction of the heat-shrinkable tube that covers the outer surface is limited to 5 to 50% is to strengthen the adhesion to the tube outer surface. In other words, the contraction rate in the tube radial direction is 5
If it is less than 50%, there will be a gap between the tube and the outer surface of the tube, resulting in poor adhesion, and if the shrinkage rate in the tube radial direction exceeds 50%, cracks will occur, resulting in poor adhesion.
ざらに伝熱管を覆う熱収縮チューブの範囲を伝熱管の両
端からそれぞれ３０００７１１１以内としたのは、３０
００ｍを超える長さで被覆すると伝熱性能を著しく阻害
する場合が生じるためである。The range of the heat shrink tube that roughly covers the heat transfer tube is within 30007111 from both ends of the heat transfer tube.
This is because if the length exceeds 00 m, the heat transfer performance may be significantly inhibited.
ざらに管外面に被覆する熱収縮チューブの厚みを３００
μｍ以下と限定したのは、管板の貫通孔の孔径と管外径
のそれぞれの公差から考えるとこれらのクリアランスは
０．６．以下であるために、管外面に被覆する熱収縮チ
ューブの厚みは、３００μｍ以下としなければならない
からである。The thickness of the heat shrink tube that covers the outer surface of the tube is 300 mm.
The reason for limiting the clearance to less than μm is that considering the respective tolerances of the through-hole diameter of the tube sheet and the outer diameter of the tube, these clearances are 0.6 mm or less. This is because the thickness of the heat-shrinkable tube covering the outer surface of the tube must be 300 μm or less.
また前回塑性樹脂としては、シリコン樹脂。Also, the plastic resin used last time was silicone resin.
ポリビニルアルコール樹脂、ポリエチレン樹脂。Polyvinyl alcohol resin, polyethylene resin.
ポリプロピレン樹脂、ポリ塩化ビニル樹脂、ポリ塩化ビ
ニリデン樹脂、ポリ酢酸ビニル樹脂。Polypropylene resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyvinyl acetate resin.
ポリスチレン樹脂、ポリメタクリル酸メチル樹脂、ポリ
アクリロニトリル樹脂、ポリビニルブチラール樹脂、ポ
リプラン樹脂２石油樹脂、ポリアミド樹脂、ポリカーボ
ネート樹脂、ポリアセタール樹脂、ポリエチレンテレフ
タレート樹脂、ポリフェニレンオキサイド樹脂、ポリス
ルフォン樹脂、ポリフェニレンサルファイド樹脂。Polystyrene resin, polymethyl methacrylate resin, polyacrylonitrile resin, polyvinyl butyral resin, Polyplan resin 2 petroleum resin, polyamide resin, polycarbonate resin, polyacetal resin, polyethylene terephthalate resin, polyphenylene oxide resin, polysulfone resin, polyphenylene sulfide resin.
ポリウレタン樹脂、アイオノマー樹脂、フッ素樹脂又は
セルロース樹脂などを用いることができる。Polyurethane resin, ionomer resin, fluororesin, cellulose resin, etc. can be used.
本発明を更に具体的に明らかにするために、以下に実施
例を示すが、本発明がかかる実施例の記載によって何等
の制約を受けるものではない。In order to clarify the present invention more specifically, Examples are shown below, but the present invention is not limited in any way by the description of the Examples.
実施例（１）
シリコン系塗料を第１図に示すように外径２５．４＃φ
、肉厚１．２４５ ｒｒｍ、長さ３０００ＩＩＩ！！１
の復水器用黄銅継目無管（ＪＩＳ Ｈ３３００Ｃ６８７
０） （１）の管内面に塗装して２０〜３０μｍの厚み
を有する塗膜を形成させたのち、該管（１）の両端部外
面をポリエステル樹脂の熱収縮チューブ（２）で被覆し
、ネーバル黄銅製管板（３）に穿設した貫通孔（４）に
挿入し、見かけの減肉率１０％で拡管して装着したのち
、ネーバル黄銅製管板（３）を陰極とし、防食電位：
−７００ｍＶ （カロメル電極基準）にて外部電源方式
で電気防食しつつ、人工海水（ＡＳＴＨ−１１４１−７
５）を管内流速２ｍ／秒で３力月間通水した。Example (1) Silicone paint was coated with an outer diameter of 25.4 #φ as shown in Figure 1.
, wall thickness 1.245 rrm, length 3000III! ! 1
Brass seamless pipe for condenser (JIS H3300C687
0) After coating the inner surface of the tube (1) to form a coating film having a thickness of 20 to 30 μm, the outer surfaces of both ends of the tube (1) are covered with heat-shrinkable polyester resin tubes (2), After inserting it into the through hole (4) drilled in the naval brass tube sheet (3), expanding the tube with an apparent thickness reduction rate of 10% and installing it, the naval brass tube sheet (3) is used as a cathode and the anticorrosive potential is applied. :
Artificial seawater (ASTH-1141-7
5) was passed through the tube at a flow rate of 2 m/sec for 3 months.
また第２図に示すように熱収縮チューブを被覆しない上
記と同じ継目無管（ＪＩＳ ８３３００Ｃ６８７０）
（１）をネーバル黄銅製管板（３）に拡管・装着したも
のについて同一条件にて３力月間通水し、それぞれの継
目無管の内面塗膜の膨れや剥離の有無を調査してその結
果を第１表に示した。In addition, as shown in Figure 2, the same seamless tube as above without covering the heat shrink tube (JIS 83300C6870)
(1) was expanded and attached to a naval brass tube plate (3) and water was passed through it under the same conditions for three months, and the presence or absence of blistering or peeling of the inner coating of each seamless pipe was investigated. The results are shown in Table 1.
第１表
実施例（２）
アルキッド系塗料を外径２５．４ｓφ、肉厚１．２４５
７１ｉＩ＋１、長さ３０００Ｍの復水器用黄銅継目無管
（ＪＩＳ Ｈ３３００Ｃ６８７０）の管内面に塗装して
２０〜３０μｍの厚みを有する塗膜を形成させたのち、
該管の両端部外面をポリエステル樹脂の熱収縮チューブ
で被覆し、ネーバル黄銅製管板に穿設した貫通孔に挿入
し、見かけの減肉率１０％で拡管して装着したのち、ネ
ーバル黄銅製管板を陰極とし、防食電位： −７００ｍ
Ｖ （カロメル電極基準）にて外部電源方式で電気防食
しつつ、管端から５０．の個所に閉塞率５０％の人工デ
ポジットを装着し、人工海水（ＡＳＴＨ−１１４１−７
５＞を管内流速２ｍ／秒で３力月間通水した。Table 1 Example (2) Alkyd paint with outer diameter 25.4sφ and wall thickness 1.245
After coating the inner surface of a 71iI+1, 3000M long seamless brass pipe for condenser (JIS H3300C6870) to form a coating film with a thickness of 20 to 30 μm,
The outer surfaces of both ends of the tube are covered with heat-shrinkable polyester resin tubes, which are inserted into through holes drilled in a naval brass tube plate, expanded to an apparent thickness reduction rate of 10%, and installed. The tube plate is used as a cathode, anti-corrosion potential: -700m
V (calomel electrode standard) while applying cathodic protection using an external power supply method and applying 50. An artificial deposit with a occlusion rate of 50% was attached to the location, and artificial seawater (ASTH-1141-7
5> was passed through the tube at a flow rate of 2 m/sec for 3 months.
また熱収縮チューブを被覆しない従来の継目無管（Ｊ！
３８３３００ Ｃ６８７０）をネーバル黄銅製管板に拡
管・装着したものについて同一条件にて３力月間通水し
、それぞれの継目無管の内面塗膜の膨れや剥離の有無を
調査してその結果を第２表に示した。In addition, conventional seamless pipes (J!
383300 C6870) expanded and attached to a naval brass tube sheet, water was passed through it under the same conditions for three months, and the presence or absence of blistering or peeling of the inner coating of each seamless pipe was investigated and the results were reported. It is shown in Table 2.
第２表
第１表及び第２表から明らかなように本発明伝熱管は膨
れや剥離が全くなく優れた特性を有していることがわか
る。Table 2 As is clear from Tables 1 and 2, the heat exchanger tube of the present invention has excellent properties without any swelling or peeling.
このように本発明によれば海水を冷却水とする熱交換器
に用いられる内面塗膜付伝熱管の電気防食による内面塗
膜の膨れヤ剥離を防止することができ、十分な腐食抑制
効果を維持することができる等工業上顕著な効果を奏す
るものである。As described above, according to the present invention, it is possible to prevent blistering and peeling of the inner coating film due to cathodic protection of heat exchanger tubes with inner coating films used in heat exchangers that use seawater as cooling water, and to achieve a sufficient corrosion inhibiting effect. It has remarkable industrial effects such as being able to maintain the temperature.
第１図は本発明の一実施例を示す側断面図、第２図は従
来例を示す側断面図である。
１・・・・・・・・黄銅継目無管（伝熱管）２・・・・
・・・・熱収縮チューブ
３・・・・・・・・管板
４・・・・・・・・貫通孔
第１図
第２図FIG. 1 is a side sectional view showing one embodiment of the present invention, and FIG. 2 is a side sectional view showing a conventional example. 1... Brass seamless tube (heat exchanger tube) 2...
...Heat shrink tube 3...Tube plate 4...Through hole Fig. 1 Fig. 2
Claims (5)
相対する貫通孔に、両端部を挿入して拡管することによ
り管板に装着する内面塗膜付伝熱管において、該両端部
の外面を絶縁性の熱収縮チューブで覆って管板の貫通孔
に挿入・拡管したことを特徴とする耐電気防食型熱交換
器用内面塗膜付伝熱管。(1) In a heat exchanger tube with an inner surface coated film, which is attached to the tube sheet by providing a large number of through holes in opposing tube sheets and expanding the tube by inserting both ends into each of the opposing through holes, A heat exchanger tube with an inner surface coated film for use in an anti-corrosion-resistant heat exchanger, the outer surface of which is covered with an insulating heat-shrinkable tube, and the tube is inserted and expanded into a through hole of a tube sheet.
囲の外面を絶縁性の熱収縮チューブで覆う請求項（１）
記載の耐電気防食型熱交換器用内面塗膜付伝熱管。(2) Claim (1) in which the outer surface within a range of 3000 mm from both ends of the heat exchanger tube is covered with an insulating heat shrink tube.
The heat exchanger tube with an inner surface coating for use in a cathodic-resistant heat exchanger as described above.
さが３００μｍ以下である請求項（１）又は（２）記載
の耐電気防食型熱交換器用内面塗膜付伝熱管。(3) The heat exchanger tube with an internal coating for an electrolytic corrosion-resistant heat exchanger according to claim 1 or (2), wherein the insulating heat-shrinkable tube covering the outer surface of the heat exchanger tube has a thickness of 300 μm or less.
〜５０％である請求項（１）、（２）又は（３）記載の
耐電気防食型熱交換器用内面塗膜付伝熱管。(4) The shrinkage rate of the insulating heat shrink tube in the radial direction is 5
50%, the heat exchanger tube with an inner surface coated film for use in a cathodic-resistant heat exchanger according to claim 1, (2), or (3).
いる請求項（１）、（２）、（３）又は（４）記載の耐
電気防食型熱交換器用内面塗膜付伝熱管。(5) A heat exchanger tube with an internal coating for an electrolytic protection type heat exchanger according to claim (1), (2), (3) or (4), wherein a plastic resin is used as the insulating heat-shrinkable tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12498588A JPH01296097A (en) | 1988-05-24 | 1988-05-24 | Heat transfer tube for electric corrosion-preventing type heat exchanger, whose inner surface is coated with coating film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12498588A JPH01296097A (en) | 1988-05-24 | 1988-05-24 | Heat transfer tube for electric corrosion-preventing type heat exchanger, whose inner surface is coated with coating film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01296097A true JPH01296097A (en) | 1989-11-29 |
Family
ID=14899070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12498588A Pending JPH01296097A (en) | 1988-05-24 | 1988-05-24 | Heat transfer tube for electric corrosion-preventing type heat exchanger, whose inner surface is coated with coating film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01296097A (en) |
-
1988
- 1988-05-24 JP JP12498588A patent/JPH01296097A/en active Pending
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