JPH0222066Y2 - - Google Patents
Info
- Publication number
- JPH0222066Y2 JPH0222066Y2 JP1983073566U JP7356683U JPH0222066Y2 JP H0222066 Y2 JPH0222066 Y2 JP H0222066Y2 JP 1983073566 U JP1983073566 U JP 1983073566U JP 7356683 U JP7356683 U JP 7356683U JP H0222066 Y2 JPH0222066 Y2 JP H0222066Y2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- flow rate
- scale
- valve
- discharge flow
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000010276 construction Methods 0.000 claims description 23
- 239000004576 sand Substances 0.000 claims description 18
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 description 8
- 239000006061 abrasive grain Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001595 flow curve Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Description
【考案の詳細な説明】
本考案は既設の埋設水道管等をサンドジエツト
流により清掃する場合に、砥粒の詰まり等を生ず
ることなく有効に施工が可能か否かを判定する為
に使用する装置に関する。[Detailed description of the invention] This invention is a device used to determine whether or not it is possible to effectively clean existing buried water pipes, etc. using sandjet flow without clogging the abrasive grains. Regarding.
一般に水道管等に於いては、使用年数の経過と
共に管内にスケールが固着して有効断面積が減少
し、水圧の低下や供給水の変色等の問題を生ずる
ことになる。これらの問題を防止するために、管
路内壁面を清掃してスケールを除去すると共に、
清掃した後の内壁面を塗料によりコーテイング処
理する方法が広く実用に供されている。 In general, in water pipes and the like, as the years of use pass, scale adheres within the pipes and the effective cross-sectional area decreases, resulting in problems such as a drop in water pressure and discoloration of the supplied water. In order to prevent these problems, the inner walls of the pipes are cleaned to remove scale, and
A method of coating the inner wall surface with paint after cleaning is widely used in practice.
而して、近年前記水道管等の清掃方法として、
第４図に示す如き所謂サンドジエツト工法が開発
され、且つ実施されている（特公昭58−11268）。
即ち、先ず混合エジエクター７に於いてコンプレ
ツサー８からの空気流内へタンク９内の砥粒１０
を混合し、次にこの砥粒と空気との混合流体Ｂを
加速器１１へ導入してこれに圧縮空気を加えて増
速し、増速した砥粒と空気との混合流体（サンド
ジエツト流）Ｃを管路１２の一端から一定流量で
噴出することにより、管内壁面のスケールＵを研
削処理するものである。尚、第４図に於いて、１
３はドレンセパレータ、１４は圧力調整器、１５
は圧力計、１６は流量計、１７は流量調整弁、１
８は洗浄水供給装置、１９はウオータミキサー、
２０は回収タンクである。 Therefore, in recent years, as a method of cleaning the water pipes, etc.,
The so-called sand jet construction method as shown in Fig. 4 has been developed and put into practice (Japanese Patent Publication No. 11268-1983).
That is, first, in the mixing ejector 7, the abrasive grains 10 in the tank 9 are introduced into the air flow from the compressor 8.
Next, this mixed fluid B of abrasive grains and air is introduced into the accelerator 11 and compressed air is added to it to increase the speed. The scale U on the inner wall surface of the pipe is ground by ejecting it at a constant flow rate from one end of the pipe 12. In addition, in Figure 4, 1
3 is a drain separator, 14 is a pressure regulator, 15
is a pressure gauge, 16 is a flow meter, 17 is a flow rate adjustment valve, 1
8 is a washing water supply device, 19 is a water mixer,
20 is a recovery tank.
前記サンドジエツト流Ｃによる管内壁面の清掃
工法は、短時間でスケールの研削除去を行なえる
という秀れた実用的効用を有する工法である。然
し乍ら、当該工法に於いては、管路１２内のサン
ドジエツト流Ｃの流量を管径に応じた一定範囲内
の値に厳密に保持する必要があり、前記流量調整
が不適正であると管路１２内に於いて砥粒の詰り
を生じるとう難点がある。 The method of cleaning the inner wall surface of a pipe using the sand jet flow C is a method that has an excellent practical effect in that scale can be ground and removed in a short period of time. However, in this construction method, it is necessary to strictly maintain the flow rate of the sand jet flow C in the pipe 12 within a certain range depending on the pipe diameter, and if the flow rate adjustment is inappropriate, the pipe There is a problem in that the abrasive grains become clogged in the chamber 12.
特に、清掃すべき管路１２が共同住宅等の水道
管の様な場合には、管口径が比較的細いうえに管
路に曲部が多いため、流量調整を一層厳格に行な
う必要があり、スケールによる管有効断面積の減
少が一定値以上に達すると、管内抵抗が高くなり
過ぎて砥粒の円滑な流通に必要な最小空気量の確
保が困難となる。即ち弾常の共同住宅等に於いて
は、管路の構成上並びに作業性能の面から最低30
〜50ｍ位いの亘長の管路（口径15A〜25A）を一
度に清掃する必要がある。ところが、固着したス
ケール層が厚いと、サンドジエツト流Ｃの噴出側
では規定の流量値を保持できても、管路の末端側
では圧力損によつて流速が低下し、規定の流量値
以下となつて詰まりや研削不良を生ずることにな
る。また逆に、末端側に於けるサンドジエツト流
の流量を規定値内に保持するため、その噴出流量
を増加したような場合には、管路の噴出端側の流
速が高くなり過ぎて管内壁面に深研削等の損傷を
生ずることになる。 In particular, when the pipe line 12 to be cleaned is a water pipe in an apartment building or the like, the pipe diameter is relatively small and there are many bends in the pipe line, so it is necessary to control the flow rate more strictly. When the reduction in the effective cross-sectional area of the tube due to scale reaches a certain value or more, the resistance inside the tube becomes too high and it becomes difficult to secure the minimum amount of air necessary for smooth flow of abrasive grains. In other words, in apartment buildings, etc. where there is a high incidence of damage, at least 30
It is necessary to clean a pipe length of ~50m (diameter 15A to 25A) at one time. However, if the fixed scale layer is thick, even if the specified flow rate can be maintained on the ejection side of the sand jet flow C, the flow velocity will decrease due to pressure loss on the end side of the pipe, and the flow rate will fall below the specified flow rate. This can lead to clogging and poor grinding. Conversely, if the sand jet flow rate at the end side is increased in order to maintain it within the specified value, the flow rate at the jet end side of the pipe becomes too high, causing damage to the inner wall surface of the pipe. This will cause damage such as deep grinding.
この様に、サンドジエツト流によるパイプ内の
清掃工法に於いては、施工に先き立つて管路の有
効断面積を正確且つ簡便に把握することが、作業
を円滑に進めるうえで必要不可欠の要件となる。
しかし、現実には管路の有効断面積を簡便に計測
し得る装置は存在せず、その結果、通常は管路１
２の一側から空気流を供給し、管路１２の他端か
らの空気流の出具合いにより、作業員が経験上の
勘に基づいて作業の可否を判断するようにしてお
り、砥粒の詰まり事故等を完全に防止するという
点では、大きな問題が残されている。 In this way, in the method of cleaning the inside of a pipe using sand jet flow, it is essential to accurately and easily understand the effective cross-sectional area of the pipe prior to construction in order to proceed smoothly with the work. becomes.
However, in reality, there is no device that can easily measure the effective cross-sectional area of a pipe, and as a result, usually
An air flow is supplied from one side of the pipe 12, and depending on the air flow from the other end of the pipe 12, the worker judges whether or not work is possible based on his/her experience and intuition. A major problem remains in terms of completely preventing clogging accidents and the like.
本考案は、所謂サンドジエツト工法に於ける上
述の如き問題の解決を課題とするものであり、管
路の吐出流量を測定することによつてスケール等
による管路の面積の減少即ち管路の有効断面積を
検知し、サンドジエツト工法の施工の可否を簡単
且つ正確に判定できるようにした装置を提供する
ことを目的とするものである。 The present invention aims to solve the above-mentioned problems in the so-called sand jet construction method, and by measuring the discharge flow rate of the pipe, it is possible to reduce the area of the pipe due to scale etc., that is, to reduce the effectiveness of the pipe. It is an object of the present invention to provide a device that can detect the cross-sectional area and easily and accurately determine whether or not the sand jet construction method can be implemented.
本件考案者は、スケール等によつて管路の有効
断面積が変化すると管路を流通する水の吐出流量
が一定の割合で変化することに着目し、管路亘
長、スケール固着量及び口径の夫々異なる各種の
テスト用管路について、スケールによる断面積の
変化と吐出流量の変化との関係を実験により調査
した。当該実験の結果から、スケールによる管路
断面積の減少率（An／Ao）と吐出流量の減少率
（Qn／Qo）との間には、略10Kg／cm2以下の流体
圧に於いてAn／Ao＝Ｋ（Qn／Qo）0.8の関係が成立す
ることを知得した。尚、前式に於いて、Aoは使
用前の管路の断面積、Anはスケールが固着した
場合の管路の平均的な有効断面積、Qoは使用前
の管路の水の吐出流量、Qoはスケールが固着し
た管路の水の吐出流量、Ｋはスケールの凹凸の度
合を示す係数であり、Ｋ１の数値である。 The inventor of this case focused on the fact that when the effective cross-sectional area of the pipe changes due to scale, etc., the discharge flow rate of water flowing through the pipe changes at a constant rate. Experiments were conducted to investigate the relationship between changes in cross-sectional area due to scale and changes in discharge flow rate for various test pipelines. From the results of this experiment, it was found that there is a difference between the rate of decrease in pipe cross-sectional area (An/Ao) due to scale and the rate of decrease in discharge flow rate (Qn/Qo) at a fluid pressure of approximately 10 Kg/ cm2 or less. /Ao=K(Qn/Qo) We learned that the relationship of 0.8 holds true. In the above equation, Ao is the cross-sectional area of the pipe before use, An is the average effective cross-sectional area of the pipe when scale is stuck, Qo is the discharge flow rate of water from the pipe before use, Qo is the discharge flow rate of water from the pipe to which the scale is adhered, and K is a coefficient indicating the degree of unevenness of the scale, which is the numerical value of K1.
即ち、ある水圧下に於ける水の吐出流量Qnを
測定することにより、該Qnと、予かじめ求めら
れている同一水圧下に於けるQoとから断面減少
率An／Aoを算出することができ、更に、管路の
断面積Aoは既知であるから、前記断面積減少率
An／Aoが判明すれば直ちにスケールが固着した
管路の平均的な有効断面積Anを求めることがで
きる。 That is, by measuring the water discharge flow rate Qn under a certain water pressure, it is possible to calculate the area reduction rate An/Ao from the Qn and the previously determined Qo under the same water pressure. Furthermore, since the cross-sectional area Ao of the pipe is known, the cross-sectional area reduction rate
Once An/Ao is known, the average effective cross-sectional area An of the pipe where the scale is stuck can be immediately determined.
一方、本件考案者は、口径が15A〜25A、管路
亘長が10〜50ｍの各種の実験用管路について、サ
ンドジエツト流により管内清掃を有効に実施でき
る管内有効断面積の限界（即ち断面減少率An／
Aoの限界）を求める試験を行なつた。その結果
から、管の有効断面積がスケール等によつて略60
％以上減少した場合には、即ち前記断面減少率
（An／Ao）が0.4以下になつた場合には、管内抵
抗が増加し過ぎて詰まりや管内壁の損傷、研削斑
等の発生により、サンドジエツト流による管内清
掃を有効に実施できないということを知得した。 On the other hand, the inventor of this case has determined that for various experimental pipes with diameters of 15A to 25A and pipe lengths of 10 to 50 m, the limit of the effective cross-sectional area within the pipe (i.e., the Rate An/
A test was conducted to determine the limit of Ao. The results show that the effective cross-sectional area of the tube is approximately 60% due to scale etc.
% or more, that is, when the area reduction ratio (An/Ao) becomes 0.4 or less, the pipe internal resistance increases too much, causing clogging, damage to the pipe inner wall, grinding spots, etc., and the sand jet It was learned that the inside of the pipe cannot be effectively cleaned using water flow.
本願考案は前記二種類の各実験結果を基にして
創作されたものであり、被処理管の末端へ連結す
る接続管と；該接続管の末端側に配設したバルブ
３と；該バルブの入口側に配設した圧力計と；前
記バルブの出口側に接続した、水頭圧Ｐと該水頭
圧Ｐに於ける施工限界吐出流量Qnとから成る判
定目盛Ａを備えた流量計形判定器とを考案の基本
構成とするものである。 The present invention was created based on the above two types of experimental results, and includes a connecting pipe connected to the end of the pipe to be treated; a valve 3 disposed on the end side of the connecting pipe; a pressure gauge disposed on the inlet side; and a flowmeter-type judger connected to the outlet side of the valve and equipped with a judgment scale A consisting of a water head pressure P and a construction limit discharge flow rate Qn at the water head pressure P; This is the basic structure of the idea.
又、前記基本構成とすることにより、サンドジ
エツト流によつて管路を有効に清掃できるか否か
を極めて正確且つ迅速に判定することができ、砥
粒の詰まり事故等を完全に防止することができ
る。 Moreover, by adopting the above basic configuration, it is possible to determine very accurately and quickly whether or not the pipe line can be effectively cleaned by the sand jet flow, and accidents such as clogging of abrasive grains can be completely prevented. can.
以下、図面に示す本考案の一実施例に基づいて
その詳細を説明する。 EMBODIMENT OF THE INVENTION Hereinafter, the details will be explained based on one embodiment of the present invention shown in the drawings.
第１図は本考案に係る施工可否判定装置の構成
図であり、図に於いて１はサンドジエツト工法に
より管内の清掃を行なう口径15〜25A位いの水道
管、２は前記水道管の末端に接続されている水
栓、３はバルブ、４は圧力計、５は流量計形判定
器、６は接続管である。 Figure 1 is a configuration diagram of the construction feasibility determination device according to the present invention. In the figure, 1 is a water pipe with a diameter of about 15 to 25A whose inside is cleaned by the sand jet method, and 2 is a water pipe at the end of the water pipe. The connected faucets include a valve 3, a pressure gauge 4, a flowmeter type determiner 5, and a connecting pipe 6.
前記流量計形判定器５はフロート形流量計と同
一の構成を有するものであり、第２図に示す如
く、水頭圧Ｐとこれに対応する施工限界吐出流量
Qnより成る判定目盛Ａが刻設されている。該判
定目盛Ａの施工限界吐出量Qnは、前記(1)式に於
いて断面減少率An／Aoを0.4、係数Ｋを１とす
ると共に、Qoとしてスケールの無い新管の場合
の測定値を用いて算出したものである。尚、第３
図は口径が15Aの管路（管路亘長10〜30ｍ）の場
合の施工限界吐出流量Qnとスケールの無い新管
路の場合の吐出流量Qoとの関係を示すものであ
り、An／Ao＝0.4，Ｋ＝１として前記(1)式を解
き、各水頭圧Ｐの下に於ける施工限界吐出流量
Qnを求めたものである。 The flow meter type determiner 5 has the same configuration as a float type flow meter, and as shown in FIG.
A judgment scale A consisting of Qn is engraved. The construction limit discharge amount Qn of the judgment scale A is calculated by setting the area reduction rate An/Ao to 0.4 and the coefficient K to 1 in equation (1) above, and using the measured value for a new pipe without scale as Qo. It was calculated using Furthermore, the third
The figure shows the relationship between the construction limit discharge flow rate Qn for a pipe with a diameter of 15A (pipe length 10 to 30 m) and the discharge flow rate Qo for a new pipe without scale, and An/Ao = 0.4, K = 1, solve equation (1) above, and find the construction limit discharge flow rate under each head pressure P.
This is to find Qn.
サンドジエツト流による管内清掃が可能か否か
の判定に際しては、先ず本願装置を第１図の様に
被処理管１の末端に接続し、バルブ２を開、バル
ブ３を閉にして管路内の水頭圧Ｐを測定する。次
に、バルブ３を全開にして判定器５を作動させ、
その指示値から施工の可否を判定する。例えば、
管路口径が15Aで水頭圧Ｐが1.0Kg／cm2の場合に
は、第３図からも明らかなようにQo＝25／
min，Qn／８／minとなり、前記判定器５の圧
力目盛1.0Kg／cm2と対応する位置には施工限界吐
出流量目盛８／minが付されている。従つて、
圧力計４による水頭圧Ｐの測定値が1.0Kg／cm2で
あれば、その時の判定器５の指示値が1.0Kg／cm2
（即ち施工限界吐出流量目盛８／min）以上に
なれば施工が可能であり、逆にその指示値が1.0
Kg／cm2（施工限界吐出流量目盛８／min）以下
であれば、サンドジエツト流による清掃の施工が
不能ということになる。 When determining whether it is possible to clean the inside of a pipe using a sand jet flow, first connect the device of the present invention to the end of the pipe to be treated 1 as shown in Fig. 1, open valve 2, close valve 3, and clean the inside of the pipe. Measure the head pressure P. Next, the valve 3 is fully opened and the determiner 5 is activated,
Based on the indicated value, it is determined whether construction is possible. for example,
When the pipe diameter is 15A and the head pressure P is 1.0Kg/ cm2 , as is clear from Figure 3, Qo = 25/
min, Qn/8/min, and a construction limit discharge flow rate scale of 8/min is attached at a position corresponding to the pressure scale of 1.0 Kg/cm 2 on the judge 5. Therefore,
If the measured value of the head pressure P by the pressure gauge 4 is 1.0Kg/cm 2 , then the indicated value of the determiner 5 at that time is 1.0Kg/cm 2
(In other words, the construction limit discharge flow rate scale is 8/min) or above, construction is possible, and conversely, the indicated value is 1.0
If it is less than Kg/cm 2 (construction limit discharge flow rate scale 8/min), cleaning by sand jet flow is impossible.
尚、本実施例に於いては判定器５の判定目盛Ａ
を、水頭圧Ｐと施工限界吐出流量Qnとを対応さ
せたものとしているが、単に施工限界吐出流量
Qnだけを目盛つておき、別途に用意した第３図
の如き圧力・流量曲線と、判定器５の指示値とを
対比して施工の可否を判断するようにしてもよい
ことは勿論である。又、本実施例に於いては、管
路口径が15Aのときのみの目盛を付しているが、
口径20A，25A用の目盛を同時に付した所謂多重
目盛形式の判定器５としてもよいことは勿論であ
り、流量減少率Qn／Qoの目盛を並設してもよ
い。 In this embodiment, the judgment scale A of the judge 5 is
is a correspondence between the water head pressure P and the construction limit discharge flow rate Qn, but it is simply the construction limit discharge flow rate Qn.
Of course, it is also possible to set only Qn on a scale and compare a separately prepared pressure/flow curve as shown in FIG. 3 with the indicated value of the judgment device 5 to judge whether or not construction is possible. In addition, in this example, the scale is provided only when the pipe diameter is 15A, but
It goes without saying that the determiner 5 may be of a so-called multiple scale type that has scales for the diameters 20A and 25A at the same time, and scales for the flow rate reduction rate Qn/Qo may be arranged in parallel.
本願考案は上述の通り、被処理パイプ１の有効
断面積の減少率An／Aoと吐出流量の減少率
Qn／Qoとの間に一定の関係があることに着目
し、被処理パイプ１の吐出流量を測定することに
より、サンドジエツト工法の施工の可否を判定す
るようにしているため、極めて簡単且つ正確に施
工の可否を判定することができ、詰まり等の事故
を確実に防止することができる。 As mentioned above, the present invention is based on the reduction rate An/Ao of the effective cross-sectional area of the pipe to be treated 1 and the reduction rate of the discharge flow rate.
By focusing on the certain relationship between Qn and Qo, and by measuring the discharge flow rate of the pipe to be treated 1, it is possible to determine whether or not the sand jet method can be applied, making it extremely easy and accurate. It is possible to determine whether construction is possible or not, and accidents such as clogging can be reliably prevented.
本考案は上述の通り秀れた実用的効用を有する
ものである。 As mentioned above, the present invention has excellent practical utility.
第１図は本考案に係るサンドジエツト工法の施
工可否判定装置の使用説明図である。第２図は判
定器の目盛部の拡大図である。第３図は、口径
15Aの管路に於ける目盛校正用の流量・圧力特性
曲線である。第４図はサンドジエツト流による管
路の清掃工法を示す系統図である。
１……被処理管、２……水栓、３……バルブ、
４……圧力計、５……流量計形判定器、６……接
続管、Ｐ……水頭圧、Qn……施工限界吐出流量、
Qo……スケールのないときの吐出流量、Ａ……
判定目盛。
FIG. 1 is an explanatory diagram of the use of a device for determining whether or not the sand jet construction method can be implemented according to the present invention. FIG. 2 is an enlarged view of the scale section of the determiner. Figure 3 shows the caliber
This is a flow rate/pressure characteristic curve for scale calibration in a 15A pipeline. FIG. 4 is a system diagram showing a method of cleaning pipelines using sand jet flow. 1...Pipe to be treated, 2...Water faucet, 3...Valve,
4...Pressure gauge, 5...Flow meter type determiner, 6...Connecting pipe, P...Hydraulic head pressure, Qn...Construction limit discharge flow rate,
Qo...Discharge flow rate when there is no scale, A...
Judgment scale.
Claims (1)
接続管６の末端側に配設したバルブ３と；該バ
ルブ３の入口側に配設した圧力計４と；前記バ
ルブ３の出口側に接続した、水頭圧Ｐと該水頭
圧Ｐに於ける施工限界吐出流量Qnとから成る
判定目盛Ａを備えた流量計形判定器５とから構
成したサンドジエツト流による管内清掃の施工
可否判定装置。 (2) 施工限界吐出流量Qnを式 〔Ｋ×（Qn／Qo）0,8＝０，４〜０，６〕（但し、 Qo：スケールがない場合の水頭圧Ｐに於ける
吐出流量、Ｋ：０，８Ｋ１）から求めた値
とした実用新案登録請求の範囲第１項に記載の
サンドジエツト流による管内清掃の施工可否判
定装置。[Scope of Claim for Utility Model Registration] (1) A connecting pipe 6 connected to the end of the pipe to be treated 1; A valve 3 disposed on the end side of the connecting pipe 6; A valve 3 disposed on the inlet side of the valve 3; It consists of a pressure gauge 4 and a flow meter type judger 5 connected to the outlet side of the valve 3 and equipped with a judgment scale A consisting of a water head pressure P and a construction limit discharge flow rate Qn at the water head pressure P. A device that determines whether or not cleaning inside pipes using sand jet flow is possible. (2) Formula for the construction limit discharge flow rate Qn: [K :0.8K1) A utility model registration claim 1, which is a device for determining whether or not pipe interior cleaning can be carried out using a sand jet flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7356683U JPS59180789U (en) | 1983-05-16 | 1983-05-16 | Device to determine whether or not pipe cleaning can be carried out using sandjet flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7356683U JPS59180789U (en) | 1983-05-16 | 1983-05-16 | Device to determine whether or not pipe cleaning can be carried out using sandjet flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59180789U JPS59180789U (en) | 1984-12-03 |
| JPH0222066Y2 true JPH0222066Y2 (en) | 1990-06-13 |
Family
ID=30203682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7356683U Granted JPS59180789U (en) | 1983-05-16 | 1983-05-16 | Device to determine whether or not pipe cleaning can be carried out using sandjet flow |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59180789U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5714198A (en) * | 1980-06-30 | 1982-01-25 | Hitachi Ltd | Continuous cleaning equipment for heat exchanger of tube type |
-
1983
- 1983-05-16 JP JP7356683U patent/JPS59180789U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5714198A (en) * | 1980-06-30 | 1982-01-25 | Hitachi Ltd | Continuous cleaning equipment for heat exchanger of tube type |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59180789U (en) | 1984-12-03 |
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