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Basic Provisions on Detection and Evaluation of Urban Drainage Pipelines

1. Units engaged in the inspection and evaluation of urban drainage pipelines should have corresponding qualifications, and the inspectors should have corresponding qualifications.

2. Instruments and equipment used in the inspection of urban drainage pipelines shall have product certificates and valid certificates of verification institutions. New equipment purchased, overhauled or re-opened after long-term shutdown shall be inspected and calibrated before being put into testing.

3. Pipeline detection methods should be selected according to the specific situation of the site and the adaptability of the testing equipment. When a detection method can not fully reflect the pipeline condition, a variety of methods can be used for joint detection.

4. The census period for the purpose of structural status should be 5-10 years, and for the purpose of functional status should be 1-2 years. When one of the following situations occurs, the census cycle can be shortened accordingly:

1. Pipelines in special areas such as quicksand-prone and collapsible soils;

2. Pipelines over 30 years old;

3. Pipeline with poor construction quality;

4. Important pipelines;

5. Pipeline with special requirements.

5. Pipeline inspection and evaluation shall be carried out in accordance with the following basic procedures:

1. Accept entrustment;

2. Site reconnaissance;

3. Preparing before testing;

4. On-site testing;

5. Internal data collation, defect interpretation and pipeline evaluation;

6. Preparing test report.

6. Inspection units shall collect relevant information in the pipeline area to be inspected according to requirements, organize technicians to conduct on-site survey, master on-site situation, formulate inspection plans and prepare for inspection.

7. The following information should be collected before pipeline inspection:

1. Existing drainage pipeline drawings and other technical data;

2. Historical data of pipeline inspection;

3. Relevant pipeline data in pipeline area to be inspected;

4. Engineering geology and hydrogeology data in pipeline area to be inspected;

5. Assessment of other relevant information required.

8. Site reconnaissance shall include the following contents:

1. Look at the surrounding environmental conditions such as landforms, landforms and traffic conditions in the inspection pipeline area;

2. Check the water level, siltation at the pipe mouth and the structure in the well.

3. Check the location of inspection wells, pipeline burial depth, pipe diameter, pipe materials and other information.

9. The testing scheme shall include the following contents:

1. Task, purpose, scope and duration of detection;

2. Survey of pipelines to be inspected (including on-site traffic conditions and analysis of historical data);

3. Selection of detection methods and control of implementation process;

4. Operation quality, health, safety, traffic organization, environmental protection and other guarantee systems and specific measures;

5. Possible problems and countermeasures;

6. Workload estimation and work schedule planning;

7. Personnel organization, equipment and material plan;

8. Outcome information to be submitted.

10. On-site testing procedures shall comply with the following provisions:

1. Pipeline should be pretreated according to the requirements of detection method before detection.

2. Inspection of instruments and equipment should be carried out.

3. Pipeline inspection and preliminary interpretation should be carried out.

4. Clean up the site and maintain the equipment in time after the test is completed.

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