|
Defect Name
|
Defect Code
|
Definition
|
Level
|
Defect Description
|
Score
|
|
Rupture
|
PL
|
The external pressure of the pipe exceeds its own tolerance, causing the pipe to rupture. There are three types of longitudinal, circumferential and composite forms.
|
1
|
Crack – when one or more of the following circumstances exist:
1) The fine crack can be seen in the pipe wall; 2) A small amount of sediment emerges from the crack in the pipe wall 3) Slight peeling. |
0.5
|
|
2
|
Gap – A significant gap is formed at the rupture, but the shape of the pipe is unaffected and the rupture does not fall off.
|
2
|
|||
|
3
|
Breakage – The circumferential coverage of debris left or broken at the wall of pipe is not more than the arc length of 60 º.
|
5
|
|||
|
4
|
Collapse – when one or more of the following circumstances exist:
1) The circumferential coverage on the edge of crack, gap or breakage of pipe material is not more than the arc length of 60 º; 2) The circumferential extent of the wall material falling off is more than the arc length of 60 º. |
10
|
|||
|
Deformation
|
BX
|
The pipe is deformed by external force to cause shape variation.
|
1
|
The deformation is not more than 5% of the pipe diameter.
|
1
|
|
2
|
The deformation is 5%~15% of the pipe diameter.
|
2
|
|||
|
3
|
The deformation is 15%~25% of the pipe diameter.
|
5
|
|||
|
4
|
The deformation is more than 25% of the pipe diameter.
|
10
|
|||
|
Corrosion
|
FS
|
The inner wall of the pipe is eroded and lost or peels off, and the pitted surface appears or the reinforcing steel bar is exposed.
|
1
|
Slight corrosion – slight surface peeling, uneven surface on the pipe wall
|
0.5
|
|
2
|
Medium corrosion – surface flaking reveals coarse aggregate or steel bar.
|
2
|
|||
|
3
|
Heavy corrosion – coarse aggregate or steel bars are fully exposed.
|
5
|
|
Defect Name
|
Defect Code
|
Definition
|
Level
|
Defect Description
|
Score
|
|
Misplaced
|
CK
|
The two nozzles of the same interface produce lateral deviation and are not in the correct position of the pipe.
|
1
|
Slight misplaced – the deviation between two connected nozzles is not greater than 1/2 of the thickness of pipe wall.
|
0.5
|
|
2
|
Medium misplaced – the deviation between two connected nozzles is 1/2~1 time of the thickness of pipe wall.
|
2
|
|||
|
3
|
Heavy misplaced – the deviation between two connected nozzles is 1~2 times of the thickness of pipe wall.
|
5
|
|||
|
4
|
Serious misplaced – the deviation between two connected nozzles is more than twice the thickness of pipe wall.
|
10
|
|||
|
Undulation
|
QF
|
The interface position deviates, the pipeline has change in vertical position and water is accumulated in the low position.
|
1
|
Undulation height / pipe diameter ≤20%.
|
0.5
|
|
2
|
20%
|
2
|
|||
|
3
|
35%
|
5
|
|||
|
4
|
Undulation height / pipe diameter > 50%.
|
10
|
|||
|
Disjointed
|
TJ
|
The ends of the two pipes are not fully joined or the interface is detached.
|
1
|
Slight disjointed – A small amount of soil is squeezed on the end of pipe.
|
1
|
|
2
|
Medium disjointed – The disjointing distance is not more than 2cm.
|
3
|
|||
|
3
|
Heavy disjointed – The disjointing distance is within 2cm ~5cm
|
5
|
|||
|
4
|
Serious disjointed – The disjointing distance is more than 5cm.
|
10
|
|||
|
Interface material falling off
|
TL
|
Rubber ring, asphalt, cement and other similar interface materials enter the pipeline.
|
1
|
The interface material is visible in the upper part of the horizontal centerline of the pipe
|
1
|
|
2
|
The interface material is visible in the lower part of the horizontal centerline of the pipe
|
3
|
|||
|
Secret connection of branch pipe
|
AJ
|
The branch pipe does not pass through the inspection well and is directly connected to the main pipe.
|
1
|
The length of the branch pipe entering the main pipe is not more than 10% of the diameter of the main pipe.
|
0.5
|
|
2
|
The length of the branch pipe entering the main pipe is 10％~20% of the diameter of the main pipe.
|
2
|
|||
|
3
|
The length of the branch pipe entering the main pipe is greater than 20% of the diameter of the main pipe.
|
5
|
|||
|
Foreign matter penetration
|
CR
|
Objects in the auxiliary equipment of the non-pipeline system penetrate the pipe wall into the pipe.
|
1
|
The foreign matter is in the pipeline and the area of the occupied water cross section is not more than 10%.
|
0.5
|
|
2
|
The foreign matter is in the pipeline and the area of the occupied water cross section is 10％~30%.
|
2
|
|||
|
3
|
The foreign matter is in the pipeline and the area of the occupied water cross section is greater than 30%.
|
5
|
|||
|
Leakage
|
SL
|
Water outside the pipe flows into the pipe.
|
1
|
Drip - water continues to drip from the defect point and flows along the pipe wall.
|
0.5
|
|
2
|
Line leakage—water continues to flow out of the defect point and out of the pipe wall.
|
2
|
|||
|
3
|
Gushing - water rushes from the defect point, the area of the water leakage surface is not more than 1/3 of the pipeline
|
5
|
|||
|
4
|
。
Leakage—The water rushes or ejects from the defect point, and the area of the leaking water surface is larger than 1/3 of the pipeline. |
10
|
