CN104651852A - Seawater pipeline sacrificial anode protector and mounting method thereof - Google Patents

Abstract

The invention provides a seawater pipeline sacrificial anode protector. The seawater pipeline sacrificial anode protector comprises a protective cover; an inner sacrificial layer is formed on the inner wall of the protective cover; and the electric potential of the metal material of the inner sacrificial layer is lower than the electric potential of the metal material of the seawater pipeline. According to the seawater pipeline sacrificial anode protector, the low-electric potential material is arranged in the pipeline to serve as the sacrificial anode, so that the seawater pipeline, valves, accessories and equipment belt seawater pipelines can be protected in the electrochemical process; the seawater pipeline sacrificial anode protector has the characteristics of simple structure, convenience for mounting, convenience for examination and replacement, high safety and reliability, no need on external power source and the like.

Description

A kind of seawaterline sacrificial protection device and installation method thereof

Technical field

The invention belongs to seawaterline sacrificial anode technical field, be specifically related to a kind of seawaterline sacrificial protection device and installation method thereof.

Background technology

Seawaterline sacrificial protection device is arranged in seawaterline using material lower for opposing lines material current potential as sacrificial anode, protects seawaterline and valve, annex.

Boats and ships seawaterline is the important component part of marine propuision system, subsystem, and it is of many uses, carries the tasks such as cooling, fire-fighting, ballast, system are light, cleaning.In sea water piping system; because seawater is rich in the salts solution of conduction; potential difference in seawaterline between different metal material or due to the stray current that environmental factors causes such as equipment ground is bad; electric current can be caused to move; thus the material that current potential is relatively low; will as sacrificial anode generation loss, the material that current potential is relatively high is then protected as negative electrode.This is the most common cause that corrosion occurs sea water piping system.This phenomenon also can occur by forming microbattery containing during impurity or when alloy material is uneven in the material.

For solving this problem, effective way by artificially arranging low potential material as sacrificial anode, is protected protected object such as pipeline, valve member, annex etc. exactly.

Arranging of sacrificial anode specifically can be selected according to protected object, and the principle of selection is exactly the polarizing current that the generation electric current of sacrificial anode reaches when protected hardware reaches protection potential.

Summary of the invention

The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of seawaterline sacrificial protection device and installation method thereof are provided.。

Technical solution of the present invention is as follows:

A kind of seawaterline sacrificial protection device, its feature is, comprising: protective sleeve, and the inwall of this protective sleeve is provided with interior sacrifice layer, and the current potential of the metallic substance that this interior sacrifice layer adopts is lower than the current potential of seawaterline metallic substance.

Also comprise and check hold concurrently equi-potential bolt and equipotential cable, the outer wall of described protective sleeve is provided with detect aperture, install for described inspection equi-potential bolt of holding concurrently, described equipotential cable with check that double equi-potential bolt is connected.

Internal diameter and the described seawaterline internal diameter of described interior sacrifice layer are suitable.

Described protective sleeve is round tube type.

Sacrifice layer is provided with diversion trench in described.

Described diversion trench is straight shape, annular or volution.

The two ends outer wall of described protective sleeve is respectively equipped with screw thread.

The installation method of described seawaterline sacrificial protection device, its feature is, the method comprises the steps:

1. select suitable seawaterline sacrificial protection device, and flange or threaded connector or ferrule fitting are set at two ends pipeline;

2. seawaterline sacrificial protection device is placed between two ends pipeline flange or threaded connector or ferrule fitting;

3. between seawaterline sacrificial protection device and pipeline or threaded connector or ferrule fitting, pad is fit into;

4. bolt, threaded connector or ferrule fitting is utilized to be fixedly connected with;

5. installation check is held concurrently equi-potential bolt and equipotential cable, by seawaterline sacrificial protection device and two ends pipeline equipotential link.

The present invention is theoretical according to galvanic corrosion, and its internal diameter is identical with tubing internal diameter, does not affect the motion of former pipeline fluid.Select expendable material by the metallic substance current potential of protected seawaterline, reach the condition of polarizing current when protected seawaterline reaches protection potential with satisfied generation electric current.

Compared with existent technique, the invention has the beneficial effects as follows: because seawater is rich in the salts solution of conduction, potential difference in seawaterline between different metal material can cause electric current to move, or environmental factors causes stray current because equipment ground is bad etc., electrochemistry (electrolysis) process that electric current causes, be cause pipeline and valve, corrosion occurs for annex, equipment machine band seawaterline major cause.The present invention by arranging low potential material as sacrificial anode in pipeline, realizes protecting seawaterline and valve, annex, equipment machine band seawaterline in above-mentioned electrochemical process.Have structural shape simple, easy for installation, check change convenient, safe reliability is high, do not need the features such as external power source.

Accompanying drawing explanation

Fig. 1 is the structural representation of seawaterline sacrificial protection device of the present invention.

Fig. 2 is the sectional view of Fig. 1.

Fig. 3 is that embodiment 1 wafer type installed by seawaterline sacrificial protection device of the present invention.

Fig. 4 is that embodiment 2 flange form installed by seawaterline sacrificial protection device of the present invention.

Fig. 5 is that embodiment 3 screw-type installed by seawaterline sacrificial protection device of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail.

Please first consult Fig. 1 and Fig. 2, Fig. 1 is the structural representation of seawaterline sacrificial protection device of the present invention, and Fig. 2 is the sectional view of Fig. 1.As shown in the figure, a kind of seawaterline sacrificial protection device, comprises protective sleeve 1, and the inwall of this protective sleeve is provided with interior sacrifice layer 2, and the current potential of the metallic substance that this interior sacrifice layer 2 adopts is lower than the current potential of seawaterline metallic substance.Preferably, also comprise and check hold concurrently equi-potential bolt 3 and equipotential cable 4, the outer wall of described protective sleeve 1 is provided with detect aperture, install for described inspection equi-potential bolt 3 of holding concurrently, described equipotential cable 4 with check that double equi-potential bolt 3 is connected.Equipotential cable 4 and inspection hold concurrently equi-potential bolt 3 by detect aperture, can realize the inspection to internal layer expendable material corrosion condition, and by sacrificial protection device and pipeline equipotential link.For ease of checking internal layer sacrificial anode situation, at the bonding surface place of protective sleeve 1 and interior sacrifice layer 2, sacrifice layer 2 is provided with diversion trench 5 in described, described diversion trench is straight shape, annular or volution.Internal diameter and the described seawaterline internal diameter of described interior sacrifice layer 2 are suitable.Described protective sleeve 1 is round tube type.

According to the mode of connection of existing pipeline, the installation method of seawaterline sacrificial protection device of the present invention comprises wafer type, flange form, screw-type three kinds.Following 3 kinds can be divided into according to its installation method and constitutional features:

A pattern that () utilizes flange sealing surface wafer type to install between piping flange, be positioned at internal diameter substantially with place tubing internal diameter, external diameter substantially with pipeline flange trim external diameter size between region, or external diameter substantially with pipeline flange external diameter size between region, bolt is used to be arranged between the pipeline flange of two ends, see accompanying drawing 3, accompanying drawing 4.

B () two ends arrange joint flange or seat board flange, by the short tube installation approach of bolt and piping Flange joint, see accompanying drawing 5.

C () two ends are threaded connection the short tube installation approach be connected with piping.

Seawaterline sacrificial protection implement body implementation step of the present invention:

Step one, according to by seawaterline Material selec-tion sacrificial anode material.

Step 2, according to seawaterline mode of connection, select sacrificial protection device installation form and structure formation, its installation approach comprises and utilizes wafer type, flange form, screw-type totally three kinds of basic patterns.

Step 3, calculating sacrificial protection device quantity, formula is as follows:

$N=\frac{I1\×S}{I2}$

In formula: I1 is protecting current density, polarizing current when namely protected hardware reaches protection potential required for unit surface, mA/m2; S is protected component wetted surface area, m2; I2 is the generation electric current of every block sacrificial anode, mA.

The protecting current density of common used material: the protecting current density of the copper alloys such as exposed bronze, brass and stainless material generally gets 300 ~ 350mA/m2; the protecting current density of exposed steel material generally gets 250 ~ 300mA/m2, and data can consult relevant criterion file.

Calculate the sacrificial anode life-span, formula is as follows:

$Y=\frac{\mathrm{GQ}1000K}{\mathrm{aIf}8760}$

In formula: Y---sacrificial anode acceptable life, a;

The net weight of G---sacrificial anode, kg;

The actual capacitance of Q---sacrificial anode, Ah/kg;

The generation electric current of If---sacrificial anode, mA;

α---current of galvanic method mean coefficient, generally gets 0.6 ~ 0.8;

K---sacrificial anode utilization coefficient, generally gets 0.85.

Calculate current of galvanic method, formula is as follows:

$I=\frac{\mathrm{\ΔE}1000}{R}$

In formula: Δ E---drive current potential, V;

G---sacrificial anode water receiving resistance, Ω.

Calculate sacrificial anode water receiving resistance, formula is as follows:

$R=\frac{\mathrm{\ρ}}{2S}$

In formula: ρ---seawater resistivity, Ω cm;

S---the equivalent length of sacrificial anode size, cm;

L---sacrificial anode length, cm;

B---sacrificial anode width or diameter, cm.

Step 4, to arrange in piping system, specifically:

1. select suitable seawaterline sacrificial protection device, and flange or threaded connector or ferrule fitting are set at two ends pipeline;

2. seawaterline sacrificial protection device is placed between two ends pipeline flange or threaded connector or ferrule fitting;

3. between seawaterline sacrificial protection device and pipeline or threaded connector or ferrule fitting, pad is fit into;

4. bolt, threaded connector or ferrule fitting is utilized to be fixedly connected with;

5. installation check is held concurrently equi-potential bolt and equipotential cable, by seawaterline sacrificial protection device and two ends pipeline equipotential link.

When choosing dress protective sleeve can prevent from checking not in place, during sacrificial corrosion perforation, surrounding devices etc. is produced and destroy, and use piping work without continuing during spare part.Protection overcoat is not selected effectively to reduce costs.

Dress can be selected to check bolt after choosing dress protective sleeve, choosing dress checks that bolt can be used for current check, when there is water leakage situation, internal layer sacrificial anode corrosion failure is described,

Should change in time, bolt is then according to regularly replacing mathematic(al) expectation not select dress to check.

Choosing dress equipotential link; main purpose is to pipeline and valve, annex, equipment connection be participated in electric current motor system for overall by equipotential cable; and all as the negative electrode of current system, realize seawaterline and valve member, annex with the corrosion of sacrificial anode, equipment machine band pipeline is comprehensive protects.

In use should carry out making regular check on or changing, after boring a hole to prevent sacrificial corrosion, seawater is excessive.

The usage quantity of sacrificial anode

After selection sacrificial anode material, select concrete installation and structural shape, and calculating is installed quantity, is used the replacement cycle.

It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to the technical scheme of invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (8)

1. a seawaterline sacrificial protection device; it is characterized in that; comprise: protective sleeve (1), the inwall of this protective sleeve is provided with interior sacrifice layer (2), and the current potential of the metallic substance that this interior sacrifice layer (2) adopts is lower than the current potential of seawaterline metallic substance.

2. seawaterline sacrificial protection device according to claim 1; it is characterized in that; also comprise and check hold concurrently equi-potential bolt (3) and equipotential cable (4); the outer wall of described protective sleeve (1) is provided with detect aperture; install for described inspection equi-potential bolt (3) of holding concurrently, described equipotential cable (4) with check that double equi-potential bolt (3) is connected.

3. seawaterline sacrificial protection device according to claim 1 and 2, is characterized in that, internal diameter and the described seawaterline internal diameter of described interior sacrifice layer (2) are suitable.

4. seawaterline sacrificial protection device according to claim 1 and 2, is characterized in that, described protective sleeve (1) is round tube type.

5. seawaterline sacrificial protection device according to claim 1 and 2, is characterized in that, sacrifice layer (2) is provided with diversion trench (5) in described.

6. seawaterline sacrificial protection device according to claim 1 and 2, is characterized in that, described diversion trench is straight shape, annular or volution.

7. seawaterline sacrificial protection device according to claim 1 and 2, is characterized in that, the two ends outer wall of described protective sleeve (1) is respectively equipped with screw thread.

8. the installation method of seawaterline sacrificial protection device according to claim 1 and 2, it is characterized in that, the method comprises the steps:

1. select suitable seawaterline sacrificial protection device, and flange or threaded connector or ferrule fitting are set at two ends pipeline;

2. seawaterline sacrificial protection device is placed between two ends pipeline flange or threaded connector or ferrule fitting;

3. between seawaterline sacrificial protection device and pipeline or threaded connector or ferrule fitting, pad is fit into;

4. bolt, threaded connector or ferrule fitting is utilized to be fixedly connected with;

5. installation check is held concurrently equi-potential bolt and equipotential cable, by seawaterline sacrificial protection device and two ends pipeline equipotential link.