JPS5923189A - Corrosion-resisting and pollution preventive metal lining steel pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in steel pipes such as seawater intake pipes, seawater U1: output pipes, and seawater introduction pipes for ships.

Conventional seawater intake pipes have been made of steel pipes coated with Epoquine coating A'.1, but seawater? In order to prevent the seasonal arrival of sheep organisms, methods have been used to inject chlorine gas into seawater and to separate seawater to generate hypochlorous acid. In addition, in order to prevent side effects, a method has been adopted in which a sacrificial anode such as lead is placed inside the piping line. However, these t1σ water intake pipes from BF have the following drawbacks: There was.

1) ``Aλ elementary gas cannot be injected in large quantities due to pollution, and the residual chlorine level must be brought to zero at the ?1σ water outlet, so the injection of chlorine gas must be strictly controlled.

2) If chlorine injection is stopped for some reason, the following problems will occur.

(a) t,'fi? Sheep Biology, 1, J Eyebrow (increase in pipe resistance, middle) 11σ Details Increase in pipe resistance due to dead organisms (re-injection of chlorine kills attached organisms.)
, ←→ Sea end sheep E! 1) Corrosion of condensate cove due to JN, 1) Cleaning to remove the formation of marine organisms, 1) Expenses for these troubles, and 1) Expenses for operating the pump for water, ice, and water. 2- It may even reach the rowari.

6) It is necessary to regularly replace sacrificial anodes such as zinc to prevent corrosion.

4) 1) The paint on the inner surface of the seawater intake pipe has deteriorated.
Since the inner surface of the tube becomes rough, the internal resistance increases.

However, the painting of the blue inner surface and the painting of I (Bee is extremely difficult work).

In addition, Kushisodo steel, which is made by clamping a copper-nickel alloy with excellent 1lIiJ properties and antifouling properties by methods such as IJE rolling or explosion bonding, is already widely used, but it has drawbacks such as this Kushisodo steel. have.

1) The cost of Kushido steel is very high. 2) If defects occur in the dark melted area, severe corrosion will occur because the copper alloy and carbon steel are not insulated. 6) It is difficult to weld, and the copper alloy part is difficult to weld. 4) It cannot be used with existing carbon steel pipes. 5) The wall thickness on the copper alloy side cannot be made thinner due to restrictions from the welding concubine.

Furthermore, a method of lining the IMj inside carbon 3@R by spot welding a Juj-Ningal alloy with excellent corrosion resistance and antifouling properties has also been used, but this method has the following drawbacks. .

1) If there is pulsation in the seawater, spot welds will be fatigued and may break. 2) If the joints of copper alloy plates are not completely sealed, the carbon steel at the joints will suffer severe electrolytic corrosion. 3) When electrolytic corrosion occurs on carbon steel, the copper alloy's f'
J has disappeared, completed, sea l sheep life 1 course (= J has arrived, ri
Spot welding creates unevenness on the inner surface of the pipe, increasing pipe resistance and causing erosion.

The present invention is intended to overcome the drawbacks of rad and welded steel, and is intended to provide a single-use, antifouling metal material such as copper or copper alloy. This invention relates to a +ni1 corrosion-proof, 7-proof metal-lined pipe, which is characterized by lining the inner surface of the pipe with an insulating layer interposed therebetween.

The following metal materials can be used in the present invention.

(a) Copper, deoxidized steel, (b) f Same manganese alloy (hereinafter, % means weight) Examples:
■Mn 2~65%-Go balance alloy■M02~65%-
Sn + up to 2% - Cu balance alloy ■ Mn 5 to 30% - 3n up to 5% - Δ up to 18.5% - Zn up to 7% - Fe up to 2.5% - I 2.5%
Up to -Cu balance alloy (c) Copper-nickel alloy ■90/I OGu -Ni alloy, ■70150C
The insulating layer used in the present invention may be made of a resin having a resistivity higher than that of seawater (for example, 1
00Ω/an or more is sufficient).

Specific types of insulation 71A (A) Each, Uracom, such as neoprene rubber, urethane rubber, (RL) 6 types of paints, such as pure epoxy coating, ri, tar epoxy coating, urethane type @ (c) Tanishin lining, such as glass flake lining, neoprene lining, polyethylene lining, (2) Various adsorbents, such as EBOKI 7-based coating, SGA coating 1, (E) J-based resin, such as vinyl chloride , Ebonai (he) There are cement, mortar, wood 4.4, etc.

In the present invention, the methods of lining the inner surface of the tube with corrosion-resistant and antifouling metal foil via an insulating layer include (a) using an organic adhesive such as epoxy resin, phenol resin, or nylon resin, and (b) using a stud bolt (h). ) If the insulating layer is rubber, is it an organic adhesive? There are several methods of increasing the flexibility of a concubine by using it to give birth to a baby and then using it to give birth to a baby.

In the present invention, the insulating layer is generally applied for about 5 to 27 times, and then the thickness of the adhesive coating layer when applying an adhesive to the inner surface of the tube is extremely low ( It's thin and good.

The present invention is a 1i5 water intake basin, (iσ water outlet n water pipe, for ships? i0 water distribution, H1 each 1 layer, t1σ for ocean structures
It can be advantageously applied to water piping, etc.

FIG. 1 is one of the embodiments of the present invention, and shows a cross-sectional view of a pipe. In Figure 431: 6 on the inner surface of steel pipe 1
After blasting, line with glass flakes 2. A brimer can also be applied to the inner surface of the steel pipe 1 before lining with the glass flakes 2. Before lining the glass flakes 2, the copper plate filter is lined with adhesive. Prior to gluing, in order to increase the adhesive strength of the 111il plate O, the copper plate 6
You can also apply nickel plating to the adhesive parts.

By adopting this 141/l: ratio, the following effects can be obtained. Copper not only has excellent corrosion resistance in seawater, but almost no marine organisms (=J) adhere to it.On the other hand, the amount of copper ions eluted is about 30 th/min, so a diameter of 2
The copper content in N water with a length soom and a flow rate of 2 m/sec is 4.2 pI)b, which is not much different from the copper content contained in normal ff1j water, and there is no problem in terms of pollution.

The purpose of lining the glass flake 2 is not only to isolate the inner surface of the steel pipe from seawater (by electrically insulating the knee tube 1 and the copper plate groove, a part of the steel pipe 1 is exposed to seawater). This was done to prevent severe ttat+, so-called electrolytic corrosion, from occurring.

Since the copper plate 6 is manufactured by rolling, its surface roughness is 501 tm or less, whereas with ordinary paint it is 1 (l Ottm).
However, as time passes, the surface roughness decreases to 50
071m may be a. In this way, the steel plate surface is smooth and the pipe resistance is low.

The inner surface of the steel sheet 1 is covered with the copper plate 6, and only the areas where the copper plate 3 is not lined with the lining C, such as the copper plate 60 or the T-joint, will be exposed to seawater. Since the bond is very small, the required quantity of TJiq lead and aluminum alloy sacrificial machines can be quite small.

Furthermore, the anti-corrosion current is greater than the distance J plate 5 iU in ice water.
Therefore, the corrosion protection range 1j·0 provided by one piece of zinc is much wider than in the normal case.

The thickness of the copper and Kari 3 depends on how long it will last, but I thought about a 20-30 year lifespan.'' Lifting platform 0.5
~I, 0 +r+m.

Is it preferable to carry out the multi-layering process with 1 roll 5 and glass flake 2?Even if there are some cavities locally, it will not be a problem with normal seawater intake and 4-man pipes. .

FIG. 2 shows a sectional view of another specific example of the steel pipe of the present invention.

In FIG. 2, after shot blasting, the inner surface of the A4 pipe 11 is coated with pure epoxy and thickly coated with 1L-112 insulation. After the Pure Ebokino coating old 12 is sufficiently dried, Cu
-The Ni alloy plate 16 is attached to the inner wall of the inner pipe 11 with adhesive.
be wandered. Processing of the joints of the Cu--Ni alloy plates 13 is as shown in FIG.

As methods for treating the joints of Cu--N4 alloy plates, there are also methods shown in FIGS. 6 and 4. As shown in FIG. 3, a neoprene lining 22 was applied to the inner surface of the steel pipe 21. +&, Cu-Mn-A/? Overlap the ends of the two alloy plates and glue them together with adhesive. After this, vulcanization treatment is performed.

In addition, after lining 74-1 shown in FIG.
Glue to 2 with J-san glue. This rice cake, cu-N1 alloy plate 3
Glue 34 long plates made of Cu-Ni alloy to the seam of Otsugi with adhesive.

The operation and effect of the one shown in Fig. 2.6.4 is almost the same as that of the lifting platform shown in Fig. 1.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of the steel station of the present invention, and FIGS. 2, 3, and 4 show aspects of how to treat the contact area of the lining metal phase of the present invention. It is an external enlarged sectional view. Sub-agents: 1-Ll Akibaridai J (14 people Ryo Hagi Nokyo - Figure 3 Figure 4 A

Claims (1)

[Claims] 11111 Anti-corrosive, anti-fouling metal lining steel agency characterized by lining the inner surface of the pipe with a four-corrosion-resistant metal ('A) such as copper or copper alloy through an insulating layer.