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How to regularly check the stainless steel storage tank


Release time:

2019-07-08

Stainless steel storage tank

What needs to be checked for regular inspection of storage tanks?

Stainless steel storage tankInspection is divided into external inspection, internal inspection and comprehensive inspection. The periodic inspection of stainless steel storage tanks shall be determined according to the technical conditions of use of the storage tank. Generally speaking, the external inspection shall be carried out at least once a year, and the internal inspection shall be carried out at least once a year.At least once every 3 years, comprehensive inspection at least once every 6 years. If the service life of the stainless steel tank is more than 15 years, the internal and external inspection shall be carried out once every two years, and if the service life is 20 years, the internal and external inspection shall be carried out at least once every year.

Stainless steel storage tank before inspection:

1. Consult the last inspection data to understand the defects, problems and treatment methods that occurred during the previous inspection;

2. Remove the materials inside the storage tank, separate it from other equipment and make obvious marks;

3. The residual gas in the storage tank is replaced and cleaned, and the analysis meets the safety standard;

4. Open all the manholes, remove the inner parts, and remove the dirt on the inner wall;

5. Cut off the power supply of the storage tank. Low-voltage explosion-proof lamps with voltage not exceeding 12v or 24v shall be used for internal inspection of the storage tank. Special personnel must be assigned to monitor the outside of the tank. The voltage of inspection instruments and tools shall not exceed 36v, and good insulated flexible wires and reliable grounding wires shall be adopted;

6. If hot work is involved, hot work approval procedures must be handled according to regulations, and the tank farm must be equipped with fire fighting, safety and rescue facilities.

1. internal inspection

1. Whether there is corrosion agent wear on the inner surface and manhole connecting tank, and whether there are cracks in the weld, head transition area or other stress concentration places;

2. When there is corrosion on the inner and outer surfaces of the tank body, multiple wall thickness measurements shall be carried out on the suspected parts. If the measured wall thickness is less than the design minimum wall thickness, the strength shall be re-approved, and suggestions on the possibility of continuous use and allowable maximum working pressure shall be put forward;

3, the inner wall of the tank has decarburization, stress corrosion, intergranular corrosion and fatigue cracks and other defects, should be carried out gold phase inspection and surface hardness determination, and put forward the inspection report.

2. External Inspection

1. Check whether the anti-corrosion layer, insulation layer and equipment nameplate of the storage tank are in good condition, and whether the safety accessories and control devices are complete, sensitive and reliable;

2. Whether there are cracks, deformation, local overheating and other phenomena on the outer surface;

3. Whether there is leakage in the welding seam of the connecting pipe and pressure components, whether the fastening bolts are in good condition, and whether the foundation is sunk, inclined and other abnormal conditions.

3. comprehensive inspection

1. The main weld or shell shall be inspected without damage, and the length of spot check shall be 20% of the total length of the weld;

2. After passing the internal and external inspection, the water pressure test shall be carried out according to 1.25 times of the design pressure of the storage tank and the air tightness test shall be carried out according to the design pressure of the storage tank. During the above inspection, the storage tank and the welds of each part have no leakage, and the storage tank has no visible abnormal deformation, which is qualified;

Stainless steel storage tankAfter the inspection is completed, a report shall be made on the inspection of the storage tank, indicating the problems and reasons that can continue to be used or can continue to be used but need to be repaired and cannot be used. The inspection report shall be kept on file for future maintenance and reference.

Because of its strong corrosion resistance, stainless steel storage tank is widely used in pharmaceutical, dairy, food, industrial and chemical storage equipment. Wuxi Weixing recommends that stainless steel storage tanks are in use. In order to avoid potential safety hazards, regular safety inspections are required.