Inspection items of chemical storage tank manufacturers

Time2024-12-03

The storage tank is classified as special equipment and needs to be inspected regularly to avoid safety hazards. The inspection of the storage tank is divided into external inspection and internal inspection. External inspection refers to the inspection of various parts and components of the tank while it contains media; internal inspection is conducted after the media inside the tank has been emptied, inspecting various parts and components of the tank.

1. What are the inspection items for tank manufacturers?

Tanks are special equipment that need to be inspected regularly to avoid safety hazards. The inspection of tanks is divided into external and internal inspections. External inspection refers to inspecting various parts of the tank while it contains medium; internal inspection is conducted after the medium inside the tank is emptied, inspecting various parts of the tank. The specific inspection items are:

1. External Inspection

(1) Routine Inspection: Can be performed by oneself, mainly to check whether the operation of the tank is normal.

(2) Visual Inspection: Conducted by professional inspectors to visually inspect various components on the outside of the tank.

(3) Acoustic Emission Inspection: Using an acoustic emission device to detect active defects in the tank's bottom plate, which is a qualitative check.

(4) Ultrasonic Wall Thickness Measurement: Using a crawler (with UT thickness gauge) to crawl from the bottom of the tank to the top, measuring thickness at regular intervals. The number of crawls is determined based on the size of the tank and inspection requirements. For stainless steel or insulated tanks, manual measurement is required.

(5) Settlement Observation: Using a total station to observe points around the tank and obtain settlement data.

2. Internal Inspection

(1) Visual Inspection: Conducted by professional inspectors according to the inspection checklist for various components inside and outside the tank.

(2) Corrosion Condition Detection of the Bottom Plate's Back: Using magnetic flux leakage scanning (MFL), combined with conventional ultrasonic testing or phased array testing (for obstructed and problematic areas) to inspect the inside of the tank.

(3) Non-destructive Testing of Welds: Magnetic particle testing or penetrant testing for welds at the inner and outer corners of the tank wall and bottom plate, lap/joint welds, repair welds, and welds connecting pipes to the tank wall.

(4) Ultrasonic Thickness Measurement of External Edge Plates.

(5) Dimensional Measurement: Determining the roundness and verticality of the tank wall.

(6) Vacuum Box Testing: Vacuum testing of the welds on the bottom plate.

(7) Settlement Observation: Using a total station to observe points around the tank and on the bottom plate to obtain settlement data.

(8) Leak Point Inspection: Conducting inspections on tanks that have already leaked.

3. The Inspection Process for Tanks

The inspection of tanks is generally conducted according to a process, which is as follows:

1. Obtain raw data and information through detection instruments or visual inspection by professional inspectors.

2. Analyze and process the raw data and information using the methods required by standards and related software, producing visual or intuitive inspection results to clearly inform tank users of the tank's condition.

3. Based on the results of data analysis and processing, calculate the service life or the next inspection time for the inspected components. For example, calculate the service life of the bottom plate based on the scanning results of its corrosion condition.

4. Provide maintenance recommendations for components that have deteriorated, ensuring that these components can continue to be used after maintenance, thus maintaining the integrity of the tank.

4. How long is the inspection cycle for tanks?

Tank inspections need to be conducted regularly, and the specific cycle should be determined and calculated based on the technical usage conditions of the tank. Generally, under normal circumstances, the inspection cycle is: external inspection at least once a year, internal inspection at least once every three years, and comprehensive inspection at least once every six years. If the tank has been in use for 15 years or more, internal and external inspections are required every two years; if the usage period reaches 20 years, internal and external inspections are required at least once a year.

Keyword： Inspection items of chemical storage tank manufacturers

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