JPH0652111B2 - Blister prevention method in fluororesin lined steel pipe - Google Patents
Blister prevention method in fluororesin lined steel pipeInfo
- Publication number
- JPH0652111B2 JPH0652111B2 JP63102612A JP10261288A JPH0652111B2 JP H0652111 B2 JPH0652111 B2 JP H0652111B2 JP 63102612 A JP63102612 A JP 63102612A JP 10261288 A JP10261288 A JP 10261288A JP H0652111 B2 JPH0652111 B2 JP H0652111B2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- temperature
- fluororesin
- peripheral surface
- lining
- 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 - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 51
- 239000010959 steel Substances 0.000 title claims description 51
- 238000000034 method Methods 0.000 title claims description 6
- 230000002265 prevention Effects 0.000 title claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 13
- 239000011347 resin Substances 0.000 claims description 13
- 230000005494 condensation Effects 0.000 claims description 10
- 238000009833 condensation Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 10
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 4
- -1 polytetrafluoroethylene Polymers 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000011491 glass wool Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 2
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- QHSJIZLJUFMIFP-UHFFFAOYSA-N ethene;1,1,2,2-tetrafluoroethene Chemical compound C=C.FC(F)=C(F)F QHSJIZLJUFMIFP-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- JOHWNGGYGAVMGU-UHFFFAOYSA-N trifluorochlorine Chemical compound FCl(F)F JOHWNGGYGAVMGU-UHFFFAOYSA-N 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
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/35—Ohmic-resistance heating
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
- Pipe Accessories (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、高圧熱水用配管等に使用する弗素樹脂ライニ
ング鋼管におけるブリスター防止方法に関する。TECHNICAL FIELD The present invention relates to a blister prevention method for a fluororesin-lined steel pipe used for high-pressure hot water pipes and the like.
〔従来の技術〕 一般に、弗素樹脂は耐薬品性，耐熱性，非粘着性などの
点で他の合成樹脂と比べて優れた特性を有している。な
かでもポリテトラフルオロエチレン樹脂（以下、ＰＴＦ
Ｅ樹脂と略称）、あるいはテトラフルオロエチレンとパ
ーフルオロアルキルビニルエーテルとの共重合体（以
下、ＰＦＡ樹脂と略称）は、２００℃以上の温度での連
続使用に耐えることができ、しかも耐薬品性においても
高温の弗素ガス，高温の三弗化塩素，溶融アルカリ金属
を除くすべての化学薬品に対して安定である。そこで上
記の弗素樹脂は、その特性を利用して腐食性流体あるい
は高温流体を扱う配管ライン、または機械装置などの耐
食性ライニング材として広く利用されている。[Prior Art] Generally, a fluororesin has superior properties to other synthetic resins in terms of chemical resistance, heat resistance, non-adhesiveness, and the like. Among them, polytetrafluoroethylene resin (hereinafter referred to as PTF
E resin) or a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether (hereinafter abbreviated as PFA resin) can withstand continuous use at a temperature of 200 ° C. or higher and has chemical resistance. It is stable against all chemicals except high temperature fluorine gas, high temperature chlorine trifluoride and molten alkali metal. Therefore, the above-mentioned fluororesin is widely used as a corrosion-resistant lining material for piping lines that handle corrosive fluids or high-temperature fluids or mechanical devices by utilizing its characteristics.
しかしながら、このような特性を有する弗素樹脂も、特
に高圧熱水下においては他の合成樹脂と同様にスチーム
の透過現象が見られる。たとえば直管，Ｌ管，Ｔ管など
の鋼管内周面を前記弗素樹脂でライニングした弗素樹脂
ライニング鋼管内に高温（例えば１５０℃以上）の熱水
を流通すると弗素樹脂ライナー層の中に圧力勾配が生
じ、少量の熱水が滲透する。特に熱水の供給を時々遮断
される場合には、滲透した熱水が凝縮して微量の水分と
なる。そして熱水が再び供給されると、上記弗素樹脂ラ
イナー層内の微量の水分が再び高温に加熱され、その結
果膨張して再び熱水となりライナー層内の微孔において
上記滲透作用を生じ、この微孔を拡大するようになる。
そのために拡大した微孔には更に多量の水分が蓄えられ
ることになり、上記のような高圧熱水の供給と遮断の繰
り返しが行われると、遂には視認できるような水が溜ま
ったブリスター（水泡）が発生する。そして、このよう
なブリスターが弗素樹脂ライナーの層内に発生すると、
熱水の浸透現象が加速度的に促進され、やがて上記ライ
ナー層中に発生した微孔が成長してライナー外周に到達
し、熱水がこのライナー層を貫通して鋼管内周面へ漏洩
したり、場合によってはライナー層が座屈するなどの重
大な問題を惹起する可能性があった。そこで、このブリ
スターの発生要因が熱水のライナー層透過にあることか
ら、ライナー層の肉厚を増大する試みが行われている
が、これは根本的解決には至らず、ブリスター防止は困
難な問題として残されていた。However, even with a fluororesin having such characteristics, a steam permeation phenomenon is observed as in the case of other synthetic resins, especially under high pressure hot water. For example, when hot water of high temperature (for example, 150 ° C. or higher) flows through a fluororesin-lined steel pipe in which the inner peripheral surface of a steel pipe such as a straight pipe, an L pipe, or a T pipe is lined with the fluororesin, a pressure gradient is generated in the fluororesin liner layer. Occurs and a small amount of hot water permeates. Especially when the supply of hot water is interrupted from time to time, the permeated hot water condenses into a small amount of water. Then, when hot water is supplied again, a small amount of water in the fluororesin liner layer is heated to a high temperature again, and as a result, it expands and becomes hot water again, causing the permeation action in the fine pores in the liner layer. The micropores will expand.
As a result, a larger amount of water is stored in the enlarged micropores, and when the supply and cutoff of high-pressure hot water as described above is repeated, the blister (water bubbles ) Occurs. When such blisters occur in the layer of fluororesin liner,
The penetration phenomenon of hot water is accelerated and eventually the micropores generated in the liner layer reach the outer circumference of the liner, and the hot water penetrates the liner layer and leaks to the inner peripheral surface of the steel pipe. However, in some cases, the liner layer may cause a serious problem such as buckling. Therefore, since the cause of this blister is permeation of the hot water to the liner layer, attempts have been made to increase the wall thickness of the liner layer, but this has not led to a fundamental solution and blister prevention is difficult. It was left as a problem.
この発明は、このような従来の問題にかんがみてなされ
たものであって、鋼管のライニング部の温度を水の凝縮
温度を越える温度に維持することにより、上記問題点を
解決することを目的としている。The present invention has been made in view of such conventional problems, and an object thereof is to solve the above problems by maintaining the temperature of the lining portion of the steel pipe at a temperature higher than the condensation temperature of water. There is.
この発明は、カップリング用のフランジを有する鋼管の
内周面及びその内周面と連続するフランジ面に弗素樹脂
ライニングを施したライニング鋼管において、該鋼管の
外周面を加熱保温する手段を設け、且つ該鋼管の外周面
と該鋼管内を流通する熱流体との温度をそれぞれ検出す
るとともに、鋼管のライニング部の温度が水の凝縮温度
を越える温度に維持することによって弗素樹脂ライニン
グ鋼管におけるブリスター発生を防止する方法としたも
のである。This invention, in a lining steel pipe having a fluorine resin lining on the inner peripheral surface of a steel pipe having a flange for coupling and a flange surface continuous with the inner peripheral surface, a means for heating and retaining the outer peripheral surface of the steel pipe is provided, Further, by detecting the temperatures of the outer peripheral surface of the steel pipe and the hot fluid flowing in the steel pipe, respectively, and maintaining the temperature of the lining portion of the steel pipe at a temperature higher than the condensation temperature of water, blistering occurs in the fluororesin-lined steel pipe. This is a method for preventing the above.
この発明は、上記のような方法に構成してあるので、検
出された前記鋼管の外周面温度とこの鋼管内の熱流体の
温度を検出し、そのどちらかの温度が水の凝縮温度に近
づくと温度制御装置により該鋼管の外周面を加熱保温す
る手段に加熱作用が生じ、鋼管の外周面が加熱される結
果、鋼管のライニング部の温度を常に水の凝縮温度を越
える温度に維持されることになる。従って鋼管内周面の
弗素樹脂ライナー層中に、鋼管内を流通する熱水が滲透
するような圧力勾配は生じないため、樹脂ライナーのブ
リスター発生は防止される。Since the present invention is configured by the above method, the detected outer peripheral surface temperature of the steel pipe and the temperature of the thermal fluid in the steel pipe are detected, and either one of them approaches the condensation temperature of water. And the temperature control device causes a heating effect on the means for heating and retaining the outer peripheral surface of the steel pipe, and the outer peripheral surface of the steel pipe is heated. It will be. Therefore, in the fluororesin liner layer on the inner peripheral surface of the steel pipe, a pressure gradient that allows hot water flowing in the steel pipe to permeate does not occur, so that the blister of the resin liner is prevented.
〔実施例〕 以下、この発明を図面を参照して説明する。第１図は本
発明に係る実施例であって、要部を断面で示した図であ
る。EXAMPLES The present invention will be described below with reference to the drawings. FIG. 1 is an embodiment according to the present invention and is a view showing a main portion in a cross section.
図において、１は鋼管であり、２はこの鋼管に固着され
たカップリング用のフランジである。３は鋼管１の内周
面とこの面に連続するフランジ面２ａを被覆した弗素樹
脂ライニング層である。実施例においては主にＰＴＦＥ
樹脂やＰＦＡ樹脂を使用するが、他にテトラフルオロエ
チレンとヘキサフルオロプロピレンとの共重合体（ＦＥ
Ｐ樹脂）、ポリテトラフルオロエチレンとエチレンとの
共重合体（ＥＴＦＥ樹脂）、ポリクロロトリフルオロエ
チレン（ＰＣＴＦＥ樹脂）等の弗素樹脂でもよい。ま
た、このライニング層の膜厚は弗素樹脂の種類や使用目
的によって異なるが、通常0.3〜5.0mmの範囲が望まし
い。In the figure, 1 is a steel pipe, and 2 is a coupling flange fixed to this steel pipe. Reference numeral 3 denotes a fluororesin lining layer which covers the inner peripheral surface of the steel pipe 1 and the flange surface 2a continuous with this surface. In the embodiment, mainly PTFE is used.
Resin or PFA resin is used, but in addition, a copolymer of tetrafluoroethylene and hexafluoropropylene (FE
Fluorine resin such as P resin), a copolymer of polytetrafluoroethylene and ethylene (ETFE resin), or polychlorotrifluoroethylene (PCTFE resin). The film thickness of this lining layer varies depending on the type of fluororesin and the purpose of use, but is preferably in the range of 0.3 to 5.0 mm.
４は鋼管１の外周に捲着された加熱体であって、本実施
例では耐熱絶縁帯中に電熱線を有するヒーターテープで
ある。また、加熱体４は、鋼管１内を流通する熱流体の
予想される最高温度に対して鋼管１のライニング部の温
度を水の凝縮温度を越える温度に維持できるような加熱
能力を有するものであれば、上記以外の公知の加熱手段
を使用してもよい。５は結合されたフランジ２，２を含
む鋼管１の外周を被覆する保温外装であって、その素材
としてはグラスウール，ロックウール，硅酸カルシウム
やこれらを組合わせたもの等を使用する。なお、この保
温外装５の中間部に耐熱性の防湿材（図示せず）を介在
させることが好ましい。Reference numeral 4 denotes a heating body wound around the outer circumference of the steel pipe 1, and in the present embodiment, a heater tape having a heating wire in a heat resistant insulating band. Further, the heating element 4 has a heating ability such that the temperature of the lining portion of the steel pipe 1 can be maintained above the condensation temperature of water with respect to the expected maximum temperature of the thermal fluid flowing in the steel pipe 1. If known, a known heating means other than the above may be used. Reference numeral 5 is a heat-insulating sheath that covers the outer circumference of the steel pipe 1 including the joined flanges 2 and 2. As its material, glass wool, rock wool, calcium silicate, or a combination thereof is used. In addition, it is preferable to interpose a heat-resistant moisture-proof material (not shown) in the middle portion of the heat insulating exterior 5.
６は対向するフランジ面２ａ，２ａを被覆した弗素樹脂
ライニング３の間にカップリングボルト７により挾圧さ
れた円環状弾性体からなるガスケットであって、鋼管１
内の熱流体の温度を検知する温度センサ８のリード線を
挿通している。９は鋼管１の外周面の温度を検知するた
めの温度センサである。これらの温度センサ８，９は、
例えばＫ熱電対などで、それぞれの温度を熱起電力とし
て取出す方式のものであって、この熱起電力は差動増幅
器（リニアライザ）へ送られ、ここで増幅された熱起電
力が信号としてＡ／Ｄ変換器１１へ入り、入力されたア
ナログ信号をデジタル信号に変換する。１２は制御装置
（マイクロコンピユータ）であって、Ａ／Ｄ変換器１１
からの入力信号に基づいて熱流体温度と鋼管外周面温度
を読み取り、この温度が水の凝縮温度を越える温度にな
るように制御値を設定し、この制御値に基づいてリレー
１３を作動し電源１４から加熱体４に供給される電流の
調節を行うようになっている。Reference numeral 6 is a gasket made of an annular elastic body that is pressed by a coupling bolt 7 between fluororesin linings 3 covering the opposite flange surfaces 2a, 2a.
The lead wire of the temperature sensor 8 for detecting the temperature of the hot fluid inside is inserted. Reference numeral 9 is a temperature sensor for detecting the temperature of the outer peripheral surface of the steel pipe 1. These temperature sensors 8 and 9 are
For example, a K thermocouple or the like is a system that takes out each temperature as a thermoelectromotive force, and this thermoelectromotive force is sent to a differential amplifier (linearizer), and the thermoelectromotive force amplified here is used as a signal A It enters the / D converter 11 and converts the input analog signal into a digital signal. Reference numeral 12 denotes a control device (microcomputer), which is an A / D converter 11
The temperature of the thermal fluid and the temperature of the outer peripheral surface of the steel pipe are read based on the input signal from, and the control value is set so that this temperature exceeds the condensation temperature of water. The current supplied from 14 to the heating element 4 is adjusted.
次に、上記温度を水の凝縮温度を越える温度に限定した
理由について述べる。Next, the reason why the above temperature is limited to a temperature above the condensation temperature of water will be described.
以下にこの知見を実験例について述べる。This finding will be described below with reference to experimental examples.
先ず装置として、称呼寸法２５Ａ，長さ１ｍの鋼管内に
厚さ1.5mmのＰＴＦＥ樹脂ライニングを施した２本の鋼
管を用意し、第２図に示すようにそれぞれのライニング
鋼管２１，２２に蒸気供給源２３、エア供給源２４、冷
水供給源２５を配管接続し、ライニング鋼管２１にはそ
の外周に前記加熱用のヒーターテープをスパイラル状に
捲回すると共にその外周にグラスウール保温層（密度２
５kg/m3以上、厚さ２５mmを２層）２６を外装した。但
し、ライニング鋼管２２にはヒーターテープや保温層は
装着していない。First, as the equipment, prepare two steel pipes with a nominal size of 25 A and a length of 1 m and a PTFE resin lining of 1.5 mm in thickness, and steam the lining steel pipes 21 and 22 as shown in FIG. A supply source 23, an air supply source 24, and a cold water supply source 25 are connected by piping, and the heater tape for heating is spirally wound around the outer circumference of the lining steel pipe 21, and the glass wool heat insulating layer (density 2
An outer layer 26 having a thickness of 5 kg / m 3 or more and a thickness of 25 mm is provided. However, the lining steel pipe 22 is not equipped with a heater tape or a heat insulating layer.
次に、ＡＳＴＭ・Ｆ４２３−８２に準拠して、上記鋼管
２１，２２内に１５０℃の蒸気（蒸気圧５kgf/cm2)を４
０分間通過させた後、７kgf/cm2のエアを５分間通過せ
しめ、次いで冷水（常温）を１０分間通過させて鋼管を
冷却する手順を１サイクルとした。このとき、鋼管２１
は冷水を通過させている際に鋼管のライニング部の温度
が水の凝縮温度を越える温度になるように、制御装置２
７を作動させて上記加熱手段を制御した。これに対して
鋼管２２には温度制御を施さなかった結果、鋼管のライ
ニング部の温度が水の凝縮温度以下になった。Next, in accordance with ASTM F423-82, steam of 150 ° C. (steam pressure 5 kgf / cm 2 ) is injected into the steel pipes 21 and 22.
After passing 0 minutes, 7 kgf / cm 2 of air was passed for 5 minutes, and then cold water (normal temperature) was passed for 10 minutes to cool the steel pipe, which was defined as one cycle. At this time, the steel pipe 21
Control device 2 so that the temperature of the lining portion of the steel pipe exceeds the condensation temperature of water while passing cold water.
7 was activated to control the heating means. On the other hand, as a result of not controlling the temperature of the steel pipe 22, the temperature of the lining portion of the steel pipe became below the condensation temperature of water.
そして、上記のような手順のヒートサイクル試験を５０
回行った結果、鋼管２１のライニングにはブリスターの
発生は勿論、なんらの異常も認められなかった。これに
反して鋼管２２のライナーには多数のブリスター発生が
認められた。Then, the heat cycle test of the procedure as described above is performed.
As a result of repeating the operation, no blister was generated in the lining of the steel pipe 21 and no abnormality was observed. On the contrary, a large number of blisters were found on the liner of the steel pipe 22.
以上の実験を繰返すことにより、ブリスター防止の温度
が水の凝縮温度を越える温度であることが確認された。By repeating the above experiment, it was confirmed that the temperature for preventing blister exceeds the condensation temperature of water.
以上説明したように、本発明によれば弗素樹脂ライニン
グ鋼管内を高圧熱流体を長期間にわたって通過させ、あ
るいは高圧熱流体の流通を継続することによる熱サイク
ルを長期間にわたって繰返し行っても弗素樹脂ライニン
グ層にブリスター発生は見られず、ライニング鋼管の耐
用年数を大幅に増大できることにより大きな経済的効果
を得ることができる。As described above, according to the present invention, even if the high-pressure thermal fluid is passed through the fluororesin-lined steel pipe for a long period of time or the thermal cycle is continued for a long time by continuing the circulation of the high-pressure thermal fluid, the fluororesin is No blister is observed in the lining layer, and the service life of the lining steel pipe can be greatly increased, so that a large economic effect can be obtained.
第１図は本発明に係る一実施例の要部断面図、第２図は
本発明の作用効果を実証するための実験装置の概要図で
ある。 １……鋼管、１ａ……鋼管内周面、２……フランジ、２
ａ……フランジ面、３……弗素樹脂ライニング、４……
ヒーターテープ（加熱手段）、５……保温材（保温手
段）。FIG. 1 is a cross-sectional view of an essential part of an embodiment according to the present invention, and FIG. 2 is a schematic view of an experimental device for demonstrating the operational effects of the present invention. 1 ... Steel pipe, 1a ... Steel pipe inner peripheral surface, 2 ... Flange, 2
a …… Flange surface, 3 …… Fluorine resin lining, 4 ……
Heater tape (heating means), 5 ... Heat insulation material (heat insulation means).
Claims (1)
内周面及びその内周面と連続するフランジ面に弗素樹脂
ライニングを施したライニング鋼管において、該鋼管の
外周面を加熱保温する手段を設け、且つ該鋼管の外周面
と該鋼管内を流通する熱流体との温度をそれぞれ検出す
るとともに、鋼管のライニング部の温度を水の凝縮温度
を越える温度に維持するごとく温度制御を行うことを特
徴とする弗素樹脂ライニング鋼管におけるブリスター防
止方法。1. A lining steel pipe having a fluorine resin lining on an inner peripheral surface of a steel pipe having a coupling flange and a flange surface continuous with the inner peripheral surface, wherein means for heating and retaining the outer peripheral surface of the steel pipe is provided. Further, the temperature of the outer peripheral surface of the steel pipe and the temperature of the hot fluid flowing in the steel pipe are respectively detected, and temperature control is performed so that the temperature of the lining portion of the steel pipe is maintained above the condensation temperature of water. Blister prevention method for fluororesin-lined steel pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63102612A JPH0652111B2 (en) | 1988-04-27 | 1988-04-27 | Blister prevention method in fluororesin lined steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63102612A JPH0652111B2 (en) | 1988-04-27 | 1988-04-27 | Blister prevention method in fluororesin lined steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01275990A JPH01275990A (en) | 1989-11-06 |
| JPH0652111B2 true JPH0652111B2 (en) | 1994-07-06 |
Family
ID=14332066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63102612A Expired - Lifetime JPH0652111B2 (en) | 1988-04-27 | 1988-04-27 | Blister prevention method in fluororesin lined steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0652111B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5277455A (en) * | 1992-09-25 | 1994-01-11 | Performance Plastics Products, Inc. | Plastic lined dual containment piping system |
| JP6465653B2 (en) * | 2014-12-26 | 2019-02-06 | 三井・ケマーズ フロロプロダクツ株式会社 | PFA molded article having excellent blister resistance and method for suppressing blister generation in PFA molded article |
-
1988
- 1988-04-27 JP JP63102612A patent/JPH0652111B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01275990A (en) | 1989-11-06 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |