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Main contents of FRP chimney inspection and approval
1. Inspection of the outer wall of the barrel body Use a camera and a telescope to scan the outer wall, record the defects found into pictures, and process the data. Divide the outer wall of the chimney into 4 areas, detect surface cracks, shelling and other defects, and make detailed records of the detected defects and their distribution.
2. Inspection of the inner wall of the barrel body The inspection of the inner wall of the chimney is carried out without stopping production. A high-pixel camera is installed and hoisted into the chimney. The outer wall temperature measurement status and the chimney structure are separated to carry out 100% video inspection of the fixed surface within a certain elevation. After image processing, the type, geometric size and location of the inner wall defects are concluded. In order to make the camera work properly in the chimney and meet the detection requirements, a set of special detection equipment should be manufactured. The equipment must meet the requirement of withstanding the flue gas temperature of 150℃ in the chimney. The inner wall of the chimney is divided into 12 equal parts and the detection is carried out from top to bottom. The detection depth is determined by the analysis of the temperature measurement of the outer wall. When there is no abnormality in the temperature measurement, only the inner wall above 75m above the elevation is fully tested.
3. Inspection of chimney wellhead (1) Video and observe the top of the chimney to see if there are defects such as cracks, weathering and cracking. (2) Inspect the wellhead concrete layer and brick body, and make detailed records of the inspection results.
4. The verticality detection of the chimney adopts the aerial measurement method of theodolite to test the verticality of the chimney, and determine whether the chimney body is tilted based on the test results.
5. Carbonation depth detection of outer wall concrete Use phenolphthalein test solution to measure the carbonation depth of the concrete, judge the carbonation depth of the chimney concrete, and provide a theoretical basis for the assessment of the safety of the chimney.
6. The rebound strength test of the outer wall is carried out by using a rebound meter at a fixed point every 10m in elevation (8 points evenly distributed per week), and the test is recorded to provide a theoretical basis for the assessment of the safety of the chimney.
7. The temperature of the outer wall is measured by using a far-infrared thermometer at a fixed point every 10m in elevation (8 points evenly distributed per circle), which fully controls the temperature change state of the outer wall of the chimney body and provides a reference basis for the inspection of the inner wall of the chimney. Mark the sudden change of the outer wall temperature value.
8. The inspection of ladders, platforms, etc. mainly checks whether the steel parts of the ladder are rusted, desoldered, etc., checks the corrosion level of the welding joints of the platform, whether there are cracks, and checks the corrosion level and deformation of the platform steel parts.
9. Inspection of lightning rod grounding and signal indicator lights
(1) Mainly check whether the lightning rod grounding steel bars and galvanized flat steel are seriously rusted, fallen off, and disconnected.
(2) Signal indicator light inspection, check whether the line and top installation are damaged.
(3) Make detailed records of the defects, corrosion levels and deformation of the lightning protection installation and signal installation to provide a basis for the inspection and reinforcement of the structure (components).
Yunbai Environment specializes in the production and sales of stainless steel chimneys, industrial chimneys, fiberglass chimneys and other products. Website: www.szhuading.com Free service hotline: 4000-118-339
