Learn the patrol inspection technical knowledge of stainless steel stop valve 2019-05-06 09:59

Stainless steel stop valve

Patrol inspection of valves: doing a good job of valve patrol inspection is the premise of doing a good job of valve operation management. A line inspection team shall be established. Its main work is not only to inspect the leakage points and construction monitoring, but also to take the inspection of valves as its main work content, and evaluate the inspection of valves through the buried loss rate index of valves.

Stainless steel stop valve

The main contents of patrol inspection include:

1. It is critical to check the material of the valve.

2. Visual inspection of valve body and seal

3. The opening and error measurement of electric valve shall be witnessed, and whether the switch is sensitive.

4. Whether the pneumatic valve leaks or is stuck.

5. Check whether there is leakage in valve body, packing, bonnet and other places, and check the tightness of packing

6. The pressure seal test must see whether the flange surface leaks, and also consider the pressure difference between API598 and the national standard.

7. Check whether the bolts are loose, especially the high temperature valve

8. Support position of valve

9. If it is a thermal insulation valve, is the thermal insulation of the valve complete

10. Whether the installation direction is correct

11. Regularly inspect the gate shaft of stainless steel stop valve to ensure that it is not buried or occupied. Observe the topographic changes at the gate shaft. If the well cover must be raised or lowered in time, ensure that the well cover will not be buried or hinder the traffic safety of the road. Urge the removal of the sundries stacked on the well position, replace the damaged well cover and well ring in time, and rebuild or repair the collapsed gate shaft in time.

12. Patrol the road construction. With the accelerating pace of urban construction and the increasing number of new and reconstruction projects of urban infrastructure, it is of great significance to do a good job in the valve inspection of the construction road to prevent the valve from being buried and carry out the maintenance and replacement of the valve simultaneously with the road construction.

13. Well cover: the well cover is lost and not matched, resulting in accidents to passers-by, which is common in various cities. In order to prevent such accidents, it is very necessary to take the gate well cover as the key point of inspection.

14. Some valves with obvious faults were found through patrol inspection. If the valve leaks, it can be easily found in the process of patrol inspection.

A. contents and implementation unit of specific patrol inspection

1. Party B shall organize its professional personnel to conduct specific patrol inspection, and Party B shall provide sites, tools, vehicles, etc.

2 specific patrol inspection shall include the following contents:

2.1 check the sealing of pipes and other components, joints, flanges and valves for leakage;

2.2 check whether the thermal insulation layer and anti-corrosion layer of the pipeline are damaged, fallen off and incomplete cold running; Whether the anti-corrosion coating is intact;

2.3 check whether the position of the pipeline meets the relevant requirements;

2.4 check whether the pipeline has abnormal vibration;

2.5 check whether pipelines collide with each other, whether pipelines sink and abnormal deformation;

2.6 check whether the supports and hangers of the pipeline fall off, deform and damage;

2.7 check valves, flanges and expansion joints;

2.8 check whether the identification on the pipeline is intact and meets the requirements;

2.9 check the safety protection device;

B. content and implementation unit of online inspection

1. For online inspection, Party B shall cooperate with the gap shutdown of the pipeline when conditions permit according to the pipeline safety level, corresponding technical parameters and operation requirements, and after Party A puts forward specific projects, time and tasks, and seek an appropriate and qualified third party recognized by the competent certification authority for online inspection. Party B and the third party shall enter into a specific contract separately.

2 within the term of the agreement, Party A shall provide Party B with the specific implementation time, requirements and items of pipeline online inspection in the next year 90 days before the expiration of each Gregorian calendar year, and the specific online inspection scheme shall be determined by both parties after negotiation. Before the on-line inspection scheme is determined, Party A shall prepare the pipeline layout, pipeline process flow diagram, single line diagram, previous on-line inspection and comprehensive inspection reports, operation parameters and other technical data related to the inspection. The third party implementing online inspection shall, on the basis of understanding these data, inspect the pipeline operation records, startup and shutdown records, records of the implementation of pipeline hidden danger monitoring measures, pipeline reconstruction construction records, maintenance reports, pipeline fault handling records, etc., and formulate the inspection scheme according to the actual situation. Party B shall play the role of organization and coordination in the formulation of the inspection plan.

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Stainless steel stop valve

Online inspection shall include the following contents:

3.1 check the sealing of pipes and other components for leakage;

3.2 check whether the thermal insulation layer of the pipeline is damaged, fallen off and incomplete cold running; Whether the anti-corrosion coating is intact;

3.3 check whether the pipeline has abnormal vibration;

3.4 check the position and deformation of the pipeline;

3.5 check the supports and hangers of pipelines;

3.6 check valves, flanges and expansion joints;

3.7 check whether the marks on the pipeline are intact and meet the requirements;

3.8 check the safety protection device;

3.9 resistance measurement;

3.10 wall thickness measurement;

4 cycle and report of on-line inspection:

4.1 the online inspection cycle shall be at least one year according to relevant national regulations. Inspect at least once a cycle;

4.2 determination of on-line inspection time;

4.3 the online inspection conclusion report provides a visual carrier record.

5 when the third party carries out online inspection, Party B shall:

5.1 urge the third party to comply with the safety management specifications of the public pipe gallery and other specifications and standards;

5.2 coordinate the relationship with the pipeline operation of other users on the public pipe rack;

5.3 organize and supervise the third party to carry out online inspection according to the contents of this agreement, and timely notify Party A of the problems found therein;