CN104514943A - Method for repairing pressure pipeline burying defects - Google Patents

Abstract

The invention discloses a method for repairing pressure pipeline burying defects. The method comprises the following steps of: step 1, detecting a detective position and size of a pressure pipeline; step 2, removing an erosion resistant coating of the detective section of the pressure pipeline, and cleaning; step 3, filling and leveling up the detective section of the pressure pipeline by using mending agent; step 4, brushing priming paint on the detective section of the pressure pipeline; step 5, drying the priming paint, and wrapping a carbon fiber material on the priming paint, wherein the carbon fiber material are bonded on the priming paint by using adhesive; step 6, solidifying the carbon fiber material, wrapping a ultraviolet protection layer on the carbon fiber material; and step 7, completely drying the ultraviolet protection layer, and brushing anti-corrosion paint on the ultraviolet protection layer. By using the method for repairing the pressure pipeline burying defects, the pressure pipeline can be repaired without stopping the gas and flame operation.

Description

The restorative procedure of pressure piping inner defect

Technical field

The present invention relates to pressure piping defect repair field, particularly relate to a kind of restorative procedure of pressure piping inner defect.

Background technique

Pressure piping is pressure-bearing class special equipment, and it must have certain voltage endurance capability to bear the pressure and temperature of carried gas medium.If pressure piping produces excessive defect in manufacture or using process---this situation objective reality and cannot thoroughly avoiding, the voltage endurance capability of pressure piping will decline.More seriously, if these defects can not get processing in time, effectively, the voltage endurance capability of pressure piping may constantly decline, and finally, this pressure piping cannot bear the active force that medium energy brings, thus cause the dangerous consequences such as leakage, blast.

From defect property, the defect that may occur in pressure piping comprises volume flaw and face type defect two class, and the former is with pore, slag inclusion for main representative, and the latter take crackle as main representative, and the harmfulness of the latter is greater than the former.From defect occurrence positions, defect may appear on inner-walls of duct or outer wall, also may be imbedded in tube wall.

In prior art, the mode of conventional processing pressure defect of pipeline has:

(1) weld.Carry out polishing to the pressure piping section of existing defects to eliminate, then carry out repair by welding.This mode is applicable to the defect of above-mentioned all types and position, and its advantage is once success just thoroughly can eliminate defect, and shortcoming is that welding existence is got angry risk and " repair and more split " risk.In addition, what is more important, weld repairs requires pressure piping stopping transportation, and for the enterprise of large production continuously, the stopping transportation of some main conduit means stopping production and huge economic loss.

(2) change whole containing defect pipeline section.The advantage of this kind of mode with weld similar, shortcoming is that cost is higher, and also needs pressure piping stopping transportation.

(3) utilize fixture (sometimes also needing to inject colloid) to embrace rejected region, be commonly called as " beating anchor ear ", enable the pressure piping containing defect temporarily maintain use.This mode is constructed simple and flexible, without the need to getting angry, and also can avoid stopping the supple of gas or steam operation and the economic loss brought thus, but shortcoming is to be used for the dangerous little and occasion that pipeline pressure is not high of medium.In addition, because the voltage endurance capability of pipeline reality does not recover, therefore, can only use as temporary measure, and helpless for all kinds of defects of the special-shaped position such as larger-size volume flaw, crackle class face type defect and elbow threeway existence.

In view of pressure piping restorative procedure of the prior art exists above-mentioned defect, therefore, a kind of new pressure piping defect-restoration method therefor being provided, repairing pressure piping when not stopping over pressure piping work significant.

Summary of the invention

For solving the problem, the invention provides a kind of restorative procedure of pressure piping inner defect, it can repair pressure piping when not stopping the supple of gas or steam, when not getting angry.

For achieving the above object, the restorative procedure of pressure piping inner defect of the present invention, comprises the following steps,

Step 1, the defective locations of detected pressures pipeline and size;

Step 2, removes the anticorrosive coat of the pressure piping section of existing defects, and carries out cleaning;

Step 3, adopts the pressure piping section of healant to described existing defects to fill and lead up process;

Step 4, brushing primer in the pressure piping section of described existing defects;

Step 5, after described priming paint drying, carbon coated lamination coating on described priming paint, described carbon fibre material by adhesive bonds on described priming paint;

Step 6, after described carbon fibre material solidification, coated antiultraviolet protective coating on described carbon fibre material;

Step 7, after described antiultraviolet protective coating parches, described antiultraviolet protective coating brushes corrosion resistant coating.

Preferably, in described step 1, the defective locations of pressure piping and size are by ultrasound examination or diffraction time difference method ultrasound detection.

Preferably, in described step 2, the anticorrosive coat removing the pressure piping section of existing defects is completed by paint stripper or wire brush.

Preferably, in described step 3, fill and lead up process and comprise the pit filled and led up in the pressure piping section of described existing defects and fill and lead up weld seam, make the pressure piping section along the circumferential direction rounding off of described existing defects.

Preferably, in described step 5, the coated number of plies N of carbon fibre material determines according to following formula,

$N=\mathrm{int}\left(\frac{{\mathrm{\σ}}_b\×t-{\mathrm{\σ}}_s\×t^{\′}}{{\mathrm{\ϵ}}_c\×E_c\×t_c}\right)+1,$

Wherein, int function refers to and rounds as immediate integer downwards by numerical value; σ _band σ _srefer to tensile strength and the yield strength of described pressure piping respectively; T and t' refer to respectively described pressure piping wall thickness and because defect exist and remaining wall thickness; ε _cand E _crefer to maximum specific elongation and the Young's modulus of described carbon fibre material respectively; t _crefer to the thickness of carbon fibre material described in individual layer.

Further, described inner defect is axial embed crack, and in described step 5, the coated wide cut W of carbon fibre material is,

$W=\max (3l,2R,l+5\sqrt{\mathrm{Rt}}),$

Wherein, l refers to the length of described axial embed crack, and R refers to the radius of described pressure piping.

Further, described inner defect is hoop embed crack, and in described step 5, the coated wide cut W of carbon fibre material is,

$W=\max (3\mathrm{R\θ},\mathrm{R\θ}+5\sqrt{\mathrm{Rt}}),$

Wherein, R refers to the radius of described pressure piping, and θ refers to the angle of described hoop embed crack.

Further, described inner defect is for axially burying pore or slag inclusion, and in described step 5, the coated wide cut W of carbon fibre material is,

$W=\max (2l,1.5R,l+4\sqrt{\mathrm{Rt}}),$

Wherein, l refers to that described axis buries the length of pore or slag inclusion, and R refers to the radius of described pressure piping.

Further, described inner defect is that hoop buries pore or slag inclusion, and in described step 5, the coated wide cut W of carbon fibre material is,

$W=\max (2\mathrm{R\θ},\mathrm{R\θ}+4\sqrt{\mathrm{Rt}}),$

Wherein, R refers to the radius of described pressure piping, and θ refers to that described hoop buries the angle of pore or slag inclusion.

The restorative procedure of pressure piping inner defect of the present invention, can repair pressure piping when not getting angry, and the safety status grade of pressure piping is met the requirements, and ensures the Security of operation.Meanwhile, adopting restorative procedure of the present invention, without the need to stopping the supple of gas or steam to pressure piping, reducing economic loss.

Accompanying drawing explanation

Fig. 1 a is the schematic diagram of the pressure piping containing a hoop inner defect;

Fig. 1 b is the schematic diagram of the pressure piping containing an axial inner defect;

Fig. 2 a is the schematic diagram of the pressure piping containing two hoop inner defects;

Fig. 2 b is the schematic diagram of the pressure piping containing two axial inner defects;

Fig. 3 is the flow chart of the restorative procedure of pressure piping inner defect of the present invention;

Fig. 4 a is the pressure piping schematic diagram containing hoop embed crack defect, wherein, the pressure piping section of existing defects is eliminated to priming paint and cleans;

Fig. 4 b is that the A-A of Fig. 4 a is to sectional view;

Fig. 5 a is the pressure piping schematic diagram containing hoop embed crack defect, has carried out filling and leading up process to the weld seam of the pressure piping section of existing defects;

Fig. 5 b is that the A-A of Fig. 5 a is to sectional view;

Fig. 6 a is the pressure piping schematic diagram containing hoop embed crack defect, has brushed priming paint to the pressure piping section of existing defects;

Fig. 6 b is that the A-A of Fig. 6 a is to sectional view;

Fig. 7 a is the pressure piping schematic diagram containing hoop embed crack defect, starts carbon coated lamination coating;

Fig. 7 b is that the A-A of Fig. 7 a is to sectional view;

Fig. 8 a is the pressure piping schematic diagram containing hoop embed crack defect, has completed the coated of carbon fibre material;

Fig. 8 b is that the A-A of Fig. 8 a is to sectional view;

Fig. 9 a is the pressure piping schematic diagram containing hoop embed crack defect, completes the coated of antiultraviolet protective coating;

Fig. 9 b is that the A-A of Fig. 9 a is to sectional view.

Figure 10 a is the pressure piping schematic diagram containing axial embed crack defect, wherein, the pressure piping section of existing defects is eliminated to priming paint and cleans;

Figure 10 b is that the A-A of Figure 10 a is to sectional view;

Figure 11 a is the pressure piping schematic diagram containing axial embed crack defect, has carried out filling and leading up process to the weld seam of the pressure piping section of existing defects;

Figure 11 b is that the A-A of Figure 11 a is to sectional view;

Figure 12 a is the pressure piping schematic diagram containing axial embed crack defect, has brushed priming paint in the pressure piping section of existing defects;

Figure 12 b is that the A-A of Figure 12 a is to sectional view;

Figure 13 a is the pressure piping schematic diagram containing axial embed crack defect, has completed the coated of carbon fibre material;

Figure 13 b is that the A-A of Figure 13 a is to sectional view;

Figure 14 a is the pressure piping schematic diagram containing axial embed crack defect, completes the coated of antiultraviolet protective coating;

Figure 14 b is that the A-A of Figure 14 a is to sectional view.

Embodiment

Below, by reference to the accompanying drawings, concrete steps of the present invention and working principle etc. are further described.

For convenience of describing, have employed the mode of hatching in accompanying drawing to distinguish the material involved by each step.In addition, Fig. 4 a, Fig. 5 a ... the mode of partial cutaway is all have employed to show the position relationship of the material in each step in Figure 14 a.

The restorative procedure of pressure piping inner defect of the present invention, mainly be applicable to inner defect, see Fig. 1 a, Fig. 1 b, so-called inner defect refers to, distance a, defect distance distance b, the flaw height h of outer wall 102 of pressure piping 1 of the inwall 101 of defect distance pressure piping 1 and the angle theta of defect have following relation: a >=0.4h, b >=0.4h and θ < π (or 180 °).If a<0.4h or b<0.4h or θ >=π (or 180 °), then this defect should be considered as surface imperfection or penetrate defect, and therefore, inconvenience uses this technology.

See Fig. 3, the restorative procedure of pressure piping inner defect of the present invention, comprises the following steps,

S1: step 1, the defective locations of detected pressures pipeline and size.

This step, detects position and the size of defect by ultrasound examination or diffraction time difference method ultrasound detection, defect may be pore, slag inclusion or crackle.Particularly, defect is divided into: axial embed crack, hoop embed crack, axially bury pore or slag inclusion, hoop buries pore or slag inclusion.

The position of defect refers to the distance b of the distance a of the inwall of this defect distance pressure piping and the outer wall of this defect distance pressure piping.

The size of defect refers to the length l of defect or the height h of angle theta and defect.The size of defect, is mainly used in the determination of scantling in follow-up each step.

As there is multiple inner defect, then need to carry out merging treatment to this inner defect.See Fig. 2 a, this defect is hoop defect, and it comprises the first defect 103 ' and the second defect 103 ' ', the angle theta of defect is the maximum angle on the border being positioned at pressure piping 1 hoop two ends defect, i.e. θ=θ ₁+ θ ₂+ θ _s, the oneself height h of defect is the ultimate range on the border being positioned at pressure piping 1 radial two ends defect, i.e. h=h ₁+ h ₂+ S ₁; See Fig. 2 b, this defect is axial flaw (for statement is convenient, illustrate only the cross section at this defect place), and it comprises the first defect 103 ' and the second defect 103 ' ', the length l of this defect is the ultimate range on the border being positioned at pressure piping 1 axial two ends defect, i.e. l=l ₁+ l ₂+ S ₂, the oneself height h of defect is the ultimate range on the border being positioned at pressure piping 1 radial two ends defect, i.e. h=h ₁+ h ₂+ S ₁.

S2: step 2, removes the anticorrosive coat of the pressure piping section of existing defects, and carries out cleaning.

Removed the anticorrosive coat (being mainly paint) of the pressure piping section of existing defects by paint stripper or steel wire, make the surface treatment class requirement of this pressure piping section reach St3.Remove the size of anticorrosive coat with on the basis ensureing subsequent handling effect, saving labor intensity is main Consideration.Particularly, the axial length X removing anticorrosive coat can set with reference to the coated wide cut W of carbon fibre material, and it should possess such relation, i.e. X=1.3 ~ 1.5W; The hoop removing anticorrosive coat should be a whole circle.

Cleaning is carried out, by removals such as the dust on pipeline and greases to the pressure piping section of the existing defects eliminating anticorrosive coat.

S3: step 3, adopts the pressure piping section of healant to existing defects to fill and lead up process.

The pit (being mainly the pit that area is larger) in the pressure piping section of existing defects is filled and led up by healant, and fill and lead up weld seam (jointing place of weld seam both sides and pressure piping), make the pressure piping section along the circumferential direction rounding off of existing defects, be convenient to subsequent treatment.

S4: step 4, brushing primer in the pressure piping section of existing defects.

This priming paint can be epoxy primer, priming paint is brushed in the pressure piping section of the existing defects after filling and leading up process, the surface covered of priming paint is about the radius of 2 π RX(R finger pressure pipeline outer walls), be as the criterion to override the removed pipe surface of anticorrosive coat completely, film thickness is 0.2mm-0.5mm.

S5: step 5, after priming paint drying, carbon coated lamination coating on priming paint, carbon fibre material by adhesive bonds on described priming paint.

Wait for about 0.5 hour, after solidifying priming paint completes, start to be wound around carbon fibre material on priming paint, carbon fibre material is bonded on priming paint by adhesive.Two preparatory works will be completed before winding, 1, the initial position be wound around is indicated, the axial position of this carbon fibre material should guarantee that defect is positioned at the centre of carbon fibre material, the hoop position of this carbon fibre material should be ahead of defective locations, be wound around easily in situation, this carbon fibre material is preferably ahead of defective locations 30 degree; 2, at carbon fibre material surface application adhesive, the coating of adhesive should ensure even, complete, and the surface covered of adhesive is about 2 π RNW, and thickness is about 0.2mm-0.5mm.

In the winding process of carbon fibre material, have following notice, 1, ensure that the starting point of carbon fibre material is positioned at the initial position of sign noted earlier, and carbon fibre material should be bonded on pipeline tightly; 2, fully get rid of the air between carbon fibre material and pressure piping section outer wall and between each layer of carbon fibre material, make carbon fibre material to be closely fitted on pressure piping.For ease of construction, can assist to be wound around by an interim cardboard tube.It should be noted that, for ease of this winding structure of clear expression, carried out exaggerating process in figure to the thickness of carbon fibre material, in fact, the thickness of carbon fibre material is generally only 0.5mm.

If single width carbon fibre material width can not meet coated wide cut needs, then several carbon fibre materials can be overlapped, as long as the lap width that the requirement of overlap joint is two-part carbon fibre material ensures 100mm, with proof strength.

Following table, for the present invention is directed to the coated wide cut of the carbon fibre material that defect of different nature adopts and the coated number of plies.

Table 1

In table 1, coated number of plies N is,

$N=\mathrm{int}\left(\frac{{\mathrm{\&sigma;}}_b\&times;t-{\mathrm{\&sigma;}}_s\&times;t^{\&prime;}}{{\mathrm{\&epsiv;}}_c\&times;E_c\&times;t_c}\right)+1,$

Wherein, int function refers to and rounds downwards; σ _band σ _sthe tensile strength of difference finger pressure pipeline and yield strength, units MPa; T and t' respectively finger pressure pipeline wall thickness and because defect exists remaining wall thickness, unit mm; ε _cand E _crefer to maximum specific elongation and the Young's modulus of carbon fibre material respectively, the latter unit is MPa; t _crefer to the thickness of monolayer carbon lamination coating, unit mm, usual value is 0.5mm.

Meanwhile, this step should be selected to carry out when weather conditions are good, to avoid the covered effect affecting carbon fibre material as far as possible.

S6: step 6, after carbon fibre material solidification, coated antiultraviolet protective coating on carbon fibre material.

This protective coating should play the effect of protection carbon fibre material, and therefore, carbon fibre material should cover by this protective coating completely.Particularly, this protective coating can be selected be wound around antiultraviolet material (by means of adhesive) or brush anti-ultraviolet paint.

S7: step 7, after antiultraviolet protective coating parches, antiultraviolet protective coating brushes corrosion resistant coating.

Corrosion resistant coating should select the paint identical with type with pipeline specifications color, and it is outer anticorrosion that this corrosion resistant coating is mainly used in formation.

Further, in conjunction with three embodiments, said method is described.

Embodiment 1 is for hoop embed crack defect

Oxygen channel 1, the 20# steel of a DN400, external diameter 426mm(nominal diameter 400mm), pipe thickness 9mm, design pressure is 3MPa, and design temperature is normal temperature.As shown in Fig. 4 a, Fig. 4 b, there is hoop embed crack defect 103 in circumferential welded seam 104 in it, crackle angle theta equals 3 °, i.e. π/60, and oneself height is about 0.5mm somewhere, apart from inner-walls of duct 4mm, apart from pipeline outer wall 4.5mm.Because of the existence of this crackle, pipeline has been judged as and can not have born the oxygen pressure that the interior size of pipe is about 3MPa, can not continue to use.

From flaw size, method of the present invention can be adopted to repair this defect, thus recover pipeline voltage endurance capability.Repair and adopt the carbon fibre cloth of series and supporting sticky impregnation, priming paint and special healant.The ε that this carbon fibre cloth is corresponding _cand E _cequal 1.5% and 76GPa respectively, monolayer carbon fibre cloth thickness t _cequal 0.5mm, consult " mechanical design handbook " known, the σ of this 20# steel _sand σ _bbe respectively 245MPa and 415MPa.According to zoom table shown in table 1, can calculate:

Coated wide cut:

$W=\max (3\&times;\frac{\mathrm{\&pi;}}{60}\&times;\frac{426}{2},\frac{\mathrm{\&pi;}}{60}\&times;\frac{426}{2}+5\sqrt{\frac{426}{2}\&times;9})=\max \left(\mathrm{33,230}\right)=230\mathrm{mm}$

The coated number of plies:

For this reason, reduce and be ready to that width is 230mm, length is about 4100mm's carbon fibre cloth, and implement as follows to repair.

The first step, by defective locations and the size of ultrasound examination oxygen channel 1.

Second step, see Fig. 4 a, Fig. 4 b, removes the skin of paint of each 150mm of circumferential welded seam about 104 containing defect 103, makes pipeline expose metallic lustre, reach the surface treatment state of St3, and clean.

3rd step, see Fig. 5 a, Fig. 5 b, preparing metal healant 2, then fills pit on pressure piping 1 and uneven between weld seam 104 and oxygen channel 1 with it.

4th step, see Fig. 6 a, Fig. 6 b, preparation epoxy primer, then brushes epoxy primer 3 at the pipe surface (comprise and carried out the surface that healant fills) eliminating skin of paint comprehensively and equably.

5th step, waits for that epoxy primer 3 solidifies about half an hour.During this period, marked winding initial position at pipe surface, this position is distance defect 100-150mm circumferentially.See Fig. 7 a, Fig. 7 b, after epoxy primer 3 drying, the sticky impregnation (not shown) prepared is brushed all sidedly at carbon fibre cloth 4 surface uniform, then complied with marked initial position, be wrapped in symmetrically on pipeline centered by defect, with reference to Fig. 8 a, 8b, till after being wound around 3 circles, carbon fibre cloth is used up.In this step, for convenience of using, can carbon fibre cloth 4 be wrapped on cylinder core 10 in advance, see Fig. 7 b.

6th step, see Fig. 9 a, Fig. 9 b, solidify (under the good climatic environment of 20 DEG C) after 8 hours, outside carbon fibre cloth 4, brush antiultraviolet protective coating 5, this protective coating 5 can play aging-resistant effect.

7th step, after antiultraviolet protective coating 5 parches, in the blue anticorrosive paint (not shown) of the outer brushing of antiultraviolet protective coating 5, makes it conform to the integral color of oxygen channel 1.

Through this process, the oxygen channel containing crack defect can bear the oxygen pressure of 3MPa again smoothly, and its safety status grade also rises to 3 grades by original 4 grades.

Embodiment 2 is for axial embed crack defect

See Figure 10 a-Figure 14 b, it is substantially identical with the step of embodiment 1, and content represented by identical mark is identical, therefore, repeats no more.

Embodiment 3 is for axially burying dreg defect

Certain buried pipeline, design pressure 2.2MPa, design temperature is-40 DEG C ~ 50 DEG C, operating pressure 2.0MPa, and pipeline specifications is Φ 219 × 6, pipe material is Q235A level steel, fed sheet of a media is liquefied petroleum gas (LPG), and defect of pipeline is for axially burying slag inclusion, long 200mm, oneself height 2mm, apart from each 2mm of inner and outer surface.

Consult " mechanical design handbook " known, the σ of Q235A material _sand σ _bequal 235MPa and 390MPa respectively.

The carbon fiber composite performance parameter selected is: Ec=70.5GPa, ε c=1.2%, monolayer carbon lamination coating thickness tc equals 0.5mm.

According to zoom table shown in table 1, can calculate:

Coated wide cut:

$W=\max (2\&times;200,1.5\&times;\frac{219}{2},200+4\sqrt{\frac{219}{2}\&times;6})=\max \left(\mathrm{400,164,303}\right)=400\mathrm{mm}$

The coated number of plies:

For this reason visible, pipeline strength rehabilitation is repaired needs width to be the carbon fibre cloth that 400mm length is about 1400mm.Because common carbon fibre cloth wide cut is 300mm, for ensureing the amount of lap of at least 100mm, need herein two fabric width 300mm length be 1400mm carbon fibre cloth overlap joint repair.Concrete method for repairing and mending is with embodiment 1.

Above, be only schematic description of the present invention, it will be recognized by those skilled in the art that on the basis of not departing from working principle of the present invention, can make multiple improvement to the present invention, this all belongs to protection scope of the present invention.

Claims (9)

1. a restorative procedure for pressure piping inner defect, is characterized in that, comprises the following steps,

Step 1, the defective locations of detected pressures pipeline and size;

Step 2, removes the anticorrosive coat of the pressure piping section of existing defects, and carries out cleaning;

Step 3, adopts the pressure piping section of healant to described existing defects to fill and lead up process;

Step 4, brushing primer in the pressure piping section of described existing defects;

Step 5, after described priming paint drying, carbon coated lamination coating on described priming paint, described carbon fibre material by adhesive bonds on described priming paint;

Step 6, after described carbon fibre material solidification, coated antiultraviolet protective coating on described carbon fibre material;

Step 7, after described antiultraviolet protective coating parches, described antiultraviolet protective coating brushes corrosion resistant coating.

2. the restorative procedure of pressure piping inner defect as claimed in claim 1, is characterized in that, in described step 1, the defective locations of pressure piping and size are by ultrasound examination or diffraction time difference method ultrasound detection.

3. the restorative procedure of pressure piping inner defect as claimed in claim 1, is characterized in that, in described step 2, the anticorrosive coat removing the pressure piping section of existing defects is completed by paint stripper or wire brush.

4. the restorative procedure of pressure piping inner defect as claimed in claim 1, it is characterized in that, in described step 3, fill and lead up process and comprise the pit filled and led up in the pressure piping section of described existing defects and fill and lead up weld seam, make the pressure piping section along the circumferential direction rounding off of described existing defects.

5. the restorative procedure of the pressure piping inner defect according to any one of Claims 1-4, is characterized in that, in described step 5, the coated number of plies N of carbon fibre material determines according to following formula,

$N=\mathrm{int}\left(\frac{{\mathrm{\&sigma;}}_b\&times;t-{\mathrm{\&sigma;}}_s\&times;t^{\&prime;}}{{\mathrm{\&epsiv;}}_c\&times;E_c\&times;t_c}\right)+1,$

Wherein, int function refers to and rounds as immediate integer downwards by numerical value; σ _band σ _srefer to tensile strength and the yield strength of described pressure piping respectively; T and t' refer to respectively described pressure piping wall thickness and because defect exist and remaining wall thickness; ε _cand E _crefer to maximum specific elongation and the Young's modulus of described carbon fibre material respectively; t _crefer to the thickness of carbon fibre material described in individual layer.

6. the restorative procedure of pressure piping inner defect as claimed in claim 5, it is characterized in that, described inner defect is axial embed crack, and in described step 5, the coated wide cut W of carbon fibre material is,

$W=\max (3l,2R,l+5\sqrt{\mathrm{Rt}}),$

Wherein, l refers to the length of described axial embed crack, and R refers to the radius of described pressure piping.

7. the restorative procedure of pressure piping inner defect as claimed in claim 5, it is characterized in that, described inner defect is hoop embed crack, and in described step 5, the coated wide cut W of carbon fibre material is,

$W=\max (3\mathrm{R\&theta;},\mathrm{R\&theta;}+5\sqrt{\mathrm{Rt}}),$

Wherein, R refers to the radius of described pressure piping, and θ refers to the angle of described hoop embed crack.

8. the restorative procedure of pressure piping inner defect as claimed in claim 5, is characterized in that, described inner defect is for axially burying pore or slag inclusion, and in described step 5, the coated wide cut W of carbon fibre material is,

$W=\max (2l,1.5R,l+4\sqrt{\mathrm{Rt}}),$

Wherein, l refers to that described axis buries the length of pore or slag inclusion, and R refers to the radius of described pressure piping.

9. the restorative procedure of pressure piping inner defect as claimed in claim 5, it is characterized in that, described inner defect is that hoop buries pore or slag inclusion, and in described step 5, the coated wide cut W of carbon fibre material is,

$W=\max (2\mathrm{R\&theta;},\mathrm{R\&theta;}+4\sqrt{\mathrm{Rt}}),$

Wherein, R refers to the radius of described pressure piping, and θ refers to that described hoop buries the angle of pore or slag inclusion.