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Regular inspection of industrial pipelines
TSGD7005 is sorted out to standardize the regular inspection work of pressure pipelines in use. In accordance with the Special Equipment Safety Law, Special Equipment Catalog, and relevant safety technical specifications.
Edited at 2024-04-18 18:45:46
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Regular inspection of industrial pipelines
- New Employee First - week Onboarding Plan
Mappa mentale per il piano di inserimento dei nuovi dipendenti nella prima settimana. Strutturata per giorni: Giorno 1 – benvenuto, configurazione strumenti, presentazione team. Secondo giorno – formazione su policy aziendali e obiettivi del ruolo. Terzo giorno – affiancamento e primi task guidati. Il quarto giorno – riunioni con dipartimenti chiave e feedback intermedio. Il quinto giorno – revisione settimanale, definizione obiettivi a breve termine e integrazione culturale.
- Analisi del campo di allenamento inglese
Mappa mentale per l’analisi della formazione francese ai Mondiali 2026. Punti chiave: attacco stellare guidato da Mbappé, con triplice minaccia (profondità, taglio, sponda). Criticità: centrocampo poco creativo – la costruzione offensiva dipende dagli attaccanti che arretrano. Difesa solida (Upamecano, Saliba, Koundé). Portiere Maignan. Variabili: gestione infortuni e condizione fisica dei big. Ideale per scout, giornalisti e tifosi.
- Analisi della lineup francese
Mappa mentale per l’analisi della formazione francese ai Mondiali 2026. Punti chiave: attacco stellare guidato da Mbappé, con triplice minaccia (profondità, taglio, sponda). Criticità: centrocampo poco creativo – la costruzione offensiva dipende dagli attaccanti che arretrano. Difesa solida (Upamecano, Saliba, Koundé). Portiere Maignan. Variabili: gestione infortuni e condizione fisica dei big. Ideale per scout, giornalisti e tifosi.
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- Outline
Regular inspection of industrial pipelines
Purpose
To standardize the regular inspection work of pressure pipelines in use
In accordance with the Special Equipment Safety Law, Special Equipment Catalog, and relevant safety technical specifications
Scope of application
industrial piping
Buried pipelines shall be implemented in accordance with TSGD7003 long-distance pipelines and related technical standards.
Power pipelines (except pipelines within the scope of boilers in the Boiler Safety Technical Supervision Regulations) are classified according to industrial pipeline classification, and shall be implemented with reference to these rules and the standards based on construction, and may also be implemented with reference to Boiler Periodic Inspection Rules 7002
Pipeline regular inspection
That is, comprehensive inspection refers to the compliance verification activities carried out by special equipment inspection agencies on the safety status of pipelines in a certain time period and in accordance with the provisions of these rules and relevant safety technical specifications and corresponding standards.
Periodic inspections must be carried out on the basis of annual inspections. When annual inspections are not carried out, the inspection cycle should be shortened appropriately.
Usually performed when the pipeline is out of service
When the operation of the pipeline does not affect the effectiveness and safety of the inspection, the inspection under operating conditions can be formulated based on the damage mode and risk level of the pipeline and combined with the usage conditions.
Periodic inspection work procedures
Inspection plan formulation
The inspection plan shall be formulated by the inspection institution and shall be approved by the technical director or authorized person of the inspection institution.
For pipelines under special circumstances, the inspection plan should seek the opinions of the user
Inspection personnel should carry out inspection work strictly in accordance with the approved inspection plan
Preparation before inspection
Data preparation and review (provided by the user)
The first inspection must be reviewed, and later as necessary
1Design information, including qualifications, instructions, drawings, and calculations
2 Installation information, including qualifications, completion information, and supervisory inspection certificate
3. Renovation or major maintenance information, including construction plans, completion information, and supervisory inspection certificates
Must check every time
4 Usage management information, including registration certificate, registration form, basic information summary table, operation records, start and stop records, changes in operating conditions, operation abnormalities and handling situations
5 Inspection and inspection data, including calibration and verification data of safety accessory instruments, annual inspection report within the inspection cycle and last regular inspection report
Inspection site preparation
Responsible entity: user unit and relevant auxiliary units
Carry out technical processing after parking and safety inspection before inspection
1. Things that affect the inspection should be cleaned or removed
2. Scaffolding and other structures are safe and secure, with guardrails exceeding 2 meters.
3. Grind and clean the pipelines that need to be inspected to meet inspection requirements, such as cracks, polishing
4Reliable isolation
5. Monitor the environment for flammable, toxic and harmful gases
6. The running pipeline slowly heats up and cools down.
7. Cut off the power supply, set up warnings, and prepare 24V lighting power
8 On-site radiation isolation and transillumination areas, set up warnings
Equipment and instrument inspection and verification
Inspection work safety requirements
Main person responsible: inspector
Confirm site safety
Comply with the safety regulations of the user unit
Subject responsible person: safety management personnel of the user unit, operation maintenance personnel
Assist in inspection work
provide information
Safe monitoring and providing reliable means of contact
Check implementation
Main inspection items
Macroscopic inspection
Inspection method: visual inspection, using endoscopes, magnifying glasses or other auxiliary inspection equipment and measuring tools if necessary
Check content
Structural inspection, including pipeline layout, supports and hangers, expansion joints, opening reinforcement, discharge devices, etc.
Geometric dimension inspection, including misalignment, undercut, and reinforcement
Appearance inspection, including 1. pipeline markings, 2. pipeline components and welds, 3. pipeline supports, 4. discharge devices, 5. anti-corrosion layer, 6. insulation layer and corrosion and cracks under the insulation layer
Precautions:
The structure and geometric dimensions are inspected during the first regular inspection. During the second regular inspection, only the key points of fatigue load and dimension change are inspected. The appearance must be inspected every time.
Wall thickness determination
Inspection method: Generally, ultrasonic thickness measurement method is used
Inspection content and requirements
The measured location is representative
1. Focus on selecting parts that are susceptible to corrosion and erosion
2. The wall thickness is thinned during manufacturing and molding, and parts that are prone to deformation, fluid accumulation, and wear during use (such as elbows, tees, and reducers)
Suspicious parts discovered by ultrasonic guided wave testing, electromagnetic testing and other methods
Branch pipe connection part
enough measurement points
The proportion of elbows, tees and reducers shall be randomly checked on the basis of each type of pipe fitting involved.
GC1 30%, no corrosion thinning or the rate does not exceed 0.0515%
GC2 20% corrosion-free thinning or the rate does not exceed 0.0515%
The measured positions of the extracted components or the straight pipe sections connected to them shall not be less than 3.
Conduct spot checks on other straight pipe sections when necessary
Measure the thickness of abnormal parts, increase detection points, determine abnormal areas, and increase the proportion of spot checks on the entire pipeline if necessary
Long-distance ultrasonic guided wave electromagnetic testing can only spot-check the wall thickness at abnormal locations
Draw a simplified diagram of the measurement points and mark the measurement location and wall thickness.
Inspection of safety accessories
Is the safety valve within the valid calibration period?
Are bursting discs replaced on schedule?
Is the emergency shut-off valve intact?
Is the pressure gauge within the verification period?
Add items if necessary
Surface defect detection
Test method: NBT47013, Ferromagnetic MT Limited
Necessary factors and detection parts
Macroscopic inspection reveals cracks or suspicious parts
Austenitic pipes with damaged insulation or possible rainwater penetration, corresponding parts
If the inspector deems it necessary, the branch pipe fillet welds
1. Carbon and low alloy cryogenic pipes, 2. CrMo steel, low-alloy high-strength steel with 3.540 and above, 4. Long-term alternating load, 5. GC1 for the first regular inspection, inspection parts: surface inspection and spot inspection at welded joints and stress concentration parts, not less than 5% of the number of joints and No less than 2
Environmental cracking, in spot inspections of other external applications (RT, UT, etc.), the proportion is not less than 10% of welded joints and not less than 2
When cracks are found, expand inspection
Buried defect detection
Detection method: NB/T47013 RT, UT, etc. If UTRT is not available, other valid detection methods can be selected.
necessary factors
The pipelines must be inspected for the first time. The requirements for the inspection parts are as follows, and random inspections will be carried out on a proportional basis.
The number of GC1 welding joints is 15% and no less than 2
Pipes with large temperature, pressure cyclic changes and large vibrations, heat-resistant steel pipes, double spot inspections, and 100% inspection of the joints drawn
The number of GC2 welding joints is 15% and no less than 2
For defects with a safety status rating of 3 or 4, the proportion of random inspections will be increased. The proportion will be determined by the inspector and the user based on the operating parameters and actual conditions.
Re-inspection is generally not carried out. When signs of internal damage are found or dangerous excessive defects are found in the previous inspection, random inspections are carried out.
The number of GC1 welding joints is at least 15% and no less than 2
The number of GC2 welding joints is at least 15% and no less than 2
Key inspection areas
Install and use reworked or repair welding parts
Finding surface cracks requires buried defect detection
Welding seam parts with extremely wrong edges
Leakage areas and nearby welded joints
Stress concentration parts such as pipe fixed openings
The first or adjacent welding joint of the pump compressor inlet and outlet
Welded joints near damaged parts of supports and hangers
Dissimilar steel welded joints
Welded joints for large deformed parts of pipelines
Parts deemed necessary by the user or inspector
material analysis
Detection methods: chemical analysis, spectral analysis, hardness testing, metallographic analysis
necessary factors
Pipes with unknown materials must be determined by chemical spectroscopy. Do not perform re-inspection.
For pipelines prone to high temperature creep and material deterioration, hardness testing of representative parts and metallographic analysis if necessary
Pipes with hardness requirements should undergo hardness testing
Compressive strength check
Method: Refer to GB.T20801.3, the verification pressure should not be lower than the allowable (monitoring) use pressure of the pipeline
necessary factors
Comprehensive thinning exceeding nominal thickness by 20%
When the inspector has doubts about the strength
Stress Analysis
Method: Computer software simulation
Necessary factors: When the inspector or user deems it necessary, conduct stress analysis on the following conditions:
There is no strength calculation sheet and the design wall thickness is ≥ 1/6 of the design outer diameter or the design pressure is greater than the allowable stress at the design temperature > 0.385
With large deformation and deflection
Seal leakage and damage caused by pipeline stress
The compensator is not set or the compensator fails when required.
Damaged support and hanger
The structure is unreasonable and serious defects have been found
There is serious overall thinning of the wall thickness
Withstand voltage test
Necessary factors: There is doubt about the safety condition of the pipeline
Method: GB/T20801 TSGD001, test pressure, temperature, etc. are calculated based on the allowable parameters determined in this regular inspection.
Implemented by the user unit and inspected by the inspection agency
Leak experiment
Implemented by the user unit and inspected by the inspection agency
Necessary factors: extremely hazardous, highly hazardous media or pipelines that are not designed to allow trace leakage
Method: Design document, TSGD001, 20801, air tightness test pressure is still the allowable operating pressure for this verification.
Special requirements for power pipelines
Carbon steel, low alloy heat-resistant steel power pipelines
If the operating temperature is ≥450°C and the operating time exceeds 6×104 60,000 hours, hardness and metallographic inspections are required, focusing on graphitization and pearlite spheroidization damage. If the operating time reaches 2×105 200,000 hours, according to the metal Corresponding to the test results of hardness, if necessary, cut the pipe and conduct material evaluation according to relevant standards.
400°C ≤ working temperature less than 450°C. After 80,000 hours of operation, the hardness and metallographic structure will be randomly inspected according to the operating status of the pipeline. The time and proportion of the next spot inspection will be determined based on the inspection results.
For power pipelines where creep measuring points have been installed, check whether the creep measurement records comply with relevant standards.
For power pipelines with a running time of more than 200,000 hours, if the metallographic structure is spheroidized, creep damage is found, or the material aging grade, creep strain, and creep rate exceed the relevant standard requirements, they should be processed or replaced in a timely manner.
For 9%~12%Cr series steel power pipelines, regular inspections should carry out hardness and metallographic inspections.
Defect handling, pipe section replacement if the following conditions occur:
1. There are macro cracks and obvious bulges on the outer surface of the pipe
2. The pipeline has been significantly thinned, and strength verification calculations have been carried out, so safe operation cannot be guaranteed until the next overhaul.
3. The pipeline is obviously roughly swollen, and safe operation cannot be guaranteed until the next overhaul.
4. The depth of pipeline corrosion points is greater than 30% of the wall thickness
5. The pipe material structure is aged or the creep damage level exceeds relevant standards.
6. Creep cracks or fatigue cracks have occurred
Defects and problem handling
1. Pipelines whose safety status is rated as level 4 or where serious defects are found during regular inspections that may lead to discontinuation of use shall be dealt with.
2. The treatment method should include using repair methods to eliminate defects or conducting fitness-for-use evaluations.
Summary of inspection results
Safety status level assessment
Assessment principles
Based on the comprehensive assessment of the inspection results, the safety status level of the pipeline is determined, and the lowest project level among them is used as the assessment level.
For pipelines that need to be modified or repaired, the safety status level shall be assessed based on the inspection results after the modification or repair.
Pipelines that fail the safety accessory level instrument inspection are not allowed to be put into use
Rating of inspection items
Pipe location or structural rating
Improper location
If there is collision and friction with other pipelines or adjacent equipment, and it meets the safety technical specifications after adjustment, it will not affect the rating. Otherwise, it will be rated as Level 3 or Level 4.
The position of the pipeline itself does not meet the safety technical specifications or standard requirements. Due to conditional restrictions, it cannot be adjusted but has little impact on the safe operation of the pipeline. It can be rated as Level 2 or Level 3, otherwise it will be rated as Level 4.
Unreasonable structure
Structural non-compliance will not affect the rating after adjustments and repairs
If the structure does not meet the requirements and cannot be repaired in time, if it does not bear obvious alternating loads and no new defects are found in regular inspections (excluding normal uniform corrosion), it can be rated as level 2 or 3. Otherwise, a safety assessment should be carried out and it will not affect safe use. The positioning is level 2 or level 3, otherwise it is set to level 4.
Material Rating of Pipe Components
The material does not match the original design
If the material is clear, the strength check passes, and no new defects are found, the inspector believes it is safe to use and does not affect the rating.
If defects occur during use and are confirmed to be caused by improper materials, they can be rated as Level 3 or Level 4.
Unknown material
If no new defects are found, and the strength verification is qualified (calculated as the lowest strength of the same type), it will be positioned at level 3, otherwise it will be rated at level 4.
Material deterioration and damage (surface decarburization, spheroidization, graphitization, temper embrittlement and other material degradation, creep, high-temperature hydrogen corrosion and other damage phenomena or abnormal hardness values are found)
Minor, and able to confirm operating conditions and positioning for safe use within the inspection cycle Level 3,
If irreparable defects or damage have occurred, level 3 or 4 will be assigned based on the degree of damage.
If the hardness value exceeds the standard in a wet hydrogen sulfide environment, and the hardness of the welded joints of carbon steel and low alloy steel pipes exceeds HB200, but no stress corrosion occurs, the inspector believes that stress corrosion will not occur by the next inspection cycle and can be classified as level 2 or 3. , otherwise it is set as level 4
Comprehensive thinning of wall thickness of pipes and fittings
If the actual measured wall thickness minus the corrosion allowance for the next inspection cycle is not less than the design minimum wall thickness, it will not affect the rating.
The compressive strength test failed and was rated as level 4.
If the stress analysis results comply with relevant safety technical regulations or standards, it will not affect the classification, otherwise it will be classified as level 4.
When the pipe does not have a designed wall thickness, it should be determined whether to shorten the inspection period based on the compressive strength verification results.
Local thinning of pipe wall thickness
If local thinning is within the allowable range of manufacturing or acceptance standards, it will not affect the classification.
If it exceeds the allowable range of manufacturing or acceptance standards and meets the following four conditions, it will be classified as Level 2 or Level 3 according to Table 3-1 or 3-2, otherwise it will be rated as Level 4
The pipeline structure complies with the design specifications or the stress analysis results meet the requirements of relevant safety technical specifications.
Under actual working conditions, the material toughness is good, and there is no material deterioration or deterioration trend.
The remaining wall thickness where the wall thickness is partially thinned is greater than 2Mm
There are no other surface defects or buried defects in the area
Not subject to fatigue loads
Crack defect rating
Surface or buried crack defects should be polished away or replaced. The pits formed after polishing should be graded as local corrosion.
If the pits are within the allowable range, repair welding is not required, otherwise repair welding or stress analysis should be performed. The repair welding or stress analysis surface does not affect safe use, and the positioning is level 2 or 3.
If the cracks cannot be removed or replaced in time, a fitness-for-service rating should be performed to determine the safety status of the pipeline.
Welding defect rating (excluding cracks)
Within the allowable range, it does not affect the rating
If the over-standard defects meet the following six conditions, they will be graded as required. If they do not meet the requirements, they will be graded directly as level 4.
The pipeline structure complies with the design specifications or the stress analysis results meet the relevant safety technical specifications.
There are no new cracks or defects near welding defects.
The tensile strength of pipe materials is less than 540MPa
The material toughness is good under actual working conditions, and there is no material deterioration trend.
Carbon steel with a minimum operating temperature higher than -20°C, austenitic stainless steel pipes with a minimum operating temperature of -20°C ~ -196°C
Not subject to fatigue loads
Excessive defects
undercut
When the undercut depth of GC1 does not exceed 0.5mm, and when GC2 and CG3 do not exceed 0.8mm, it does not affect the grading. Otherwise, it should be polished away and graded according to local thinning.
round defect
If the circular defect rate is not greater than 5% and the long diameter of a single circular defect is less than the smaller of 0.5te (effective thickness) and 6mm, it will not affect the classification, otherwise it will be positioned as level 4
bar defect
When the maximum height or width of a GC1-level pipeline strip defect does not exceed 0.3te and is not greater than 5mm, if the total length of the defect does not exceed 0.5ΠD, it will be classified as level 2. If the length of the defect does not exceed 1ΠD, it will be classified as level 3. Otherwise, position it as level 4
When the maximum height or width of a GC2-level pipeline strip defect does not exceed 0.35te and is not greater than 6mm, if the total length of the defect does not exceed 0.5ΠD, it will be classified as level 2. If the length of the defect does not exceed 1ΠD, it will be classified as level 3. Otherwise, position it as level 4
Not penetrated
20. Q345R, austenitic stainless steel without penetration is graded as local thinning, other materials are graded as unfused.
Not fused
GC1 When the total unfused length of a single welded joint is not greater than 50% of the length of the welded joint, it is graded according to Table 3-4 on page 15, otherwise it is classified as level 4
GC2 unfused length is not limited, graded according to Table 3-4
Wrong Side
GC1 Positioning level 2 for outer wall misalignment less than 20% of the nominal thickness and no more than 3mm. If it exceeds this range and no serious defects are found after long-term use, it will be rated as level 2 or level 3.
GC2 Positioning level 2 for outer wall misalignment less than 25% of the nominal thickness and not greater than 5mm. If it exceeds this range and no serious defects are found after long-term use, it will be rated as level 2 or level 3.
GC1, GC2 If there are serious defects such as cracks, lack of fusion, and lack of penetration in the misaligned edge parts, it will be directly graded as level 4.
Pipe component ratings
There are wrinkles, heavy skin and other defects on the surface of the pipe. After polishing, it will be graded as local thinning.
Mechanical damage, tool marks and arc burns on the pipe shall be eliminated by polishing. After polishing and elimination, the pits shall be graded as local thinning. The above-mentioned defects of other pipe components shall not affect the safe use of the pipe and shall be graded as Level 2. Otherwise, shall be graded as Level 3 or level 4
If the pipeline component is deformed and does not affect safe use, it will be rated as level 2, otherwise it will be rated as 3 or 4.
If there is a leak in a pipeline component, it will be classified as level 3 if the leakage part is treated and does not affect safe use. Otherwise, it will be classified as level 4.
Pipe support and hanger ratings
Abnormal repairs or replacements will not affect the rating.
If it cannot be repaired in time, stress analysis or fitness for use evaluation will be carried out. The analysis and evaluation results will not affect the safe use of the positioning level 2, otherwise it will be level 34.
Pipeline pressure test or leakage test rating
If the failure is due to its own reasons, it will be graded as level 4.
Comprehensive assessment of safety level
Level 1 and Level 2, the inspection conclusion is that it meets the requirements and can continue to be used.
Level 3, the inspection conclusion is that it basically meets the requirements, and it can be used under conditional monitoring
Level 4, the inspection conclusion is that it does not meet the requirements and it cannot be used anymore. It can be used after modification and repair or re-rating after it meets the evaluation.
Issue inspection report
After the periodic inspection is completed, the inspector shall assess the pipeline safety status level in accordance with the provisions of these rules based on the actual situation and inspection results, issue an inspection report, and clearly specify the allowed (monitored) parameters and the date of the periodic inspection in the next volume)
Inspection records and reports
The inspection process should be recorded in a timely manner, and the inspection records should be detailed, true, and accurate, and the amount of information recorded should not be less than the amount of information in the inspection report.
After the inspection is completed, an "Industrial Pipeline Periodic Inspection Report" is generally issued within 30 working days or within an agreed period. The report should have three-level signatures of inspection, review, and approval. The approver is the technical person in charge of the inspection agency or the authorized person.
The inspection record report should be signed by the on-site inspection personnel and saved to the next inspection cycle
Test preliminary conclusions
Due to the needs of pipeline operation, for inspections without problems, the inspector can issue a "Special Equipment Periodic Inspection Opinion Notice 1" before issuing a report.
Special requirements for problem handling
If the inspection finds that there are defects that need to be dealt with, the inspection agency can issue a "Special Equipment Periodic Inspection Opinion Notice 2" and notify the user of the inspection results. The user is responsible for entrusting a unit with corresponding qualifications to deal with the defects. The treatment is completed and confirmed by the inspection agency. If the results are suitable for use, an inspection report will be issued.
If there is no rectification, the report will be issued based on the actual situation first. After rectification, the report will be issued again after confirmation.
In case of serious accident risks, the inspection agency shall, in addition to issuing a notice 2, also promptly notify the user registration authority of the situation.
Periodic inspection cycle
General regulations: Pipelines are generally inspected for the first time within 3 years after being put into use, and subsequent inspection periods are determined according to the pipeline safety level. (The reason is that the safety status rating is only available after the first inspection. In addition, the early stage of use is also the period when pipeline quality problems occur most, and then gradually stabilize until damage or failure occurs.)
For safety status levels of 1 and 2, GC1 and GC2 are generally inspected not more than once every 6 years, and GC3 is not inspected more than once every 9 years.
The safety level is Level 3, and inspections are generally not performed more than once every three years. During the period of use, the user should take effective monitoring measures for the pipeline.
If the safety level is Level 4, the user shall deal with the pipeline defects, otherwise it shall not continue to be used.
Risk-Based Inspection (RBI) Cycle
1. Refer to the general regulations and the inspection period can be appropriately extended or shortened based on the risk-based inspection results, but the maximum period shall not exceed 9 years.
2. Based on the remaining life of the pipeline, the inspection period shall not exceed half of the remaining life of the pipeline and shall not exceed 9 years.
For pipelines whose risk level exceeds the acceptable level of the user, the reasons for the higher risk should be analyzed, and targeted inspection and testing methods and measures should be adopted to reduce the risk and control the risk within the acceptable range of the user.
special regulations
Shortening of inspection cycle
1. The corrosion of pipeline materials by the medium or environment is unknown or the corrosion thinning is abnormal.
2. There is a tendency for environmental cracking (stress corrosion cracking, hydrogen-induced cracking, etc.) or mechanical damage (fatigue, high temperature creep, etc.), and cracking has been found
Changing the medium used may cause the corrosion phenomenon to worsen.
Material deterioration is more obvious
The user fails to conduct annual inspections in accordance with these rules
Foundation settlement causes pipeline deflection and deformation, affecting safety.
During the inspection, it is suspected that there are other factors affecting safety
Failure to conduct periodic inspections as scheduled
The user can issue a written declaration explaining the situation, and with the approval of the person in charge of safety management of the user, and with the consent of the inspection agency responsible for the last periodic inspection (except for the extension of the first inspection), the extension can be made. Or the user may apply for a risk-based inspection.
For pipelines that have not been regularly inspected as scheduled, the user should take effective monitoring and emergency management measures.
Obligations of the user
1. Develop a regular inspection plan for pipelines and submit a periodic inspection report to the inspection agency one month before the expiration date.
2. Carry out inspection cooperation and safety monitoring, and be responsible for the authenticity of the information provided
3. Propose treatment or rectification measures for the defects and problems discovered during the inspection, and be responsible for their implementation, and promptly provide written feedback on the treatment or rectification to the inspection agency
Responsibilities of inspection agencies and inspectors
1. The inspection agency shall engage in pipeline inspection work in accordance with the approved inspection scope and be responsible for the authenticity, accuracy and validity of the inspection report
Authenticity: The report is based on objective facts and does not make false statements.
Accuracy: The accuracy of the detection data involved in the report meets relevant requirements
Validity: 1. The qualifications of the inspection agency and the inspection personnel meet the requirements; 2. The equipment, instruments and tools used for measurement during inspection and testing are within the validity period of verification and calibration; 3. The inspection basis is legal and the report approval meets the requirements.
2. Personnel engaged in pipeline inspection and testing should obtain corresponding special equipment inspection and testing personnel certificates and register in accordance with relevant regulations
3. The inspection agency and the sub-district user unit shall conduct inspections in a timely manner after reporting for periodic inspections of pipelines
4. Inspection agencies should regularly conduct inspection work training for inspection and testing personnel, and keep training records
annual inspection
annual inspection
That is, the user unit conducts regular self-inspections, at least once a year.
Basic requirements for annual inspections
The user unit develops an annual inspection management system
It can be carried out by professionally trained personnel organized by the safety management personnel of the user unit.
You can also entrust an inspection agency with the qualification for periodic inspection of industrial pipelines to carry out the inspection.
Necessary inspection tools and equipment should be equipped when conducting annual inspections by yourself
Annual inspection content
Pipeline safety management inspection
Pipeline Health Check
Check key parts
1. Inlet and outlet parts of compressors and pumps
2. Compensator, tee, elbow, reducer, branch pipe connection, valve connection and dead ends of medium flow, etc.
3. The easily damaged parts of the support and hanger as well as nearby pipeline components and welded joints
4. Locations where problems affecting the safe operation of pipelines have occurred
5. Shutdowns at key parts of the production process and connected to important devices or equipment
6. Pipe sections with harsh working conditions and long-term heavy loads
7 Based on the high-risk pipeline sections given in the risk inspection analysis report
8. Pipe sections that were highlighted for monitoring during the last periodic inspection
Safety accessories and instrument inspection
Measure wall thickness and resistance value if necessary
The anti-static grounding resistance value is not greater than 100Ω, and the contact resistance value between flanges is less than 0.03Ω.
Annual inspection report and conclusion
Meets the requirements, no defects affecting safe use are found or only minor defects are found that do not affect safe use, and can continue to be used within the allowed parameters.
Basically meet the requirements, if general defects are found, and the user can ensure safety after taking measures, it can be used under monitoring conditions, and the monitoring conditions, problems that need to be solved during the monitoring operation, and the completion deadline should be noted in the inspection rounds.
If the pipeline does not meet the requirements, serious defects occur, and the safe operation of the pipeline cannot be guaranteed, it is not allowed to be used and must be stopped or further inspected by the inspection agency.
Annual inspection records and reports shall be reviewed and approved by the person in charge of safety management of the user unit or the authorized safety administrator.