設備檢查概論(編輯修改稿)

　

【文章內容簡介】 鹵素測 漏 (6)質譜儀測 漏 洩漏檢測 LT 不同測漏法靈敏度的比較 方 法 可測到最低洩漏率() 壓力變化測漏 與時間有關 超音波測漏 化學滲透劑測漏 104 氣泡測漏 105 鹵素測漏 1010 質譜儀測漏 1012 材質辨識 (PMI) ? 材質初步分析 (適用於合金鋼、不銹鋼 )以移動式分光儀為之。 唯受限於不能檢驗曲度過大之工件，且受檢面積需 50mm*50mm以上，方能便於用槍，又因其一經移動則需重新校正，加上裝備笨重不利高空作業。 ? 目前已有多種 pmi儀器，使用同位素法輕巧方便。 真空試漏 ? 位置： 底板焊道及母材部分或頂板焊道 。 ? 時機：考慮各項鋼板之腐蝕有洩漏時。 ? 實施方式：在可疑位置塗上肥皂液或專用溶液，利用真空試漏箱緊壓此區域，真空開口邊緣與儲槽板之間放置一層軟的墊圈，經真空泵抽真空至少表壓負 4psig以上真空度，如有洩漏時，可由真空箱頂的玻璃看出有明顯的泡泡產生 Rapid Tube Inspection using Eddy Current (ET) or Remote Field (RFT) methods ? Characteristics of the ET technique ? High speed method. Inspects 500800, 10m tubes per day. ? 100% inspection of the tube. ? Little surface preparation (cleaning). ? Color coded reporting for convenient results overview. Heat exchanger Inspection Probe Signals produced by various amounts of corrosion thinning. Periodically, refinery plants are shutdown for inspection. Inspectors feed eddy current probes into heat exchanger tubes to check for corrosion damage. Pipe with damage Manual Ultrasonic (UT) Weld Inspection ? Quick and direct results. ? No protection against radiation required, neither interruption of other peoples work. ? Inservice inspection. ? Inspection of plex geometry welds with profile analysis of the weld using a PC. ? Inspections performed according to international standards ASME, EN etc. ? Final technical report that contains position, depth and type information of discontinuity. ? Storage of the discontinuities signals and inspection parameters. ? Sensitivity in critical discontinuities detection (. cracking). Automated Ultrasonic (UT) Tube Corrosion Mapping ? Inspection speed up to 100mm per second, depending on the desirable resolution. ? The probe for data recording is inserted pletely automated with a 300mm per second speed depending on the required measurement precision. ? Complete 2 or 3 axes recording (CScan and BScan) with capability to export the data on Excel worksheet for further analysis. ? Inspects tubes with diameters from 12mm up to 76mm. ? Thickness and corrosion mapping and/or inspection for other types of imperfections. Ultrasonic Thickness Measurements ?Quick measurements with direct results. ?High precision measurements. ?The inspected object can be inservice. ?No particular surface preparation required. ?Measurements can be made without removal of the paint. ? Measurements on high temperature surfaces possible Guided Ultrasonic Waves Pipe Inspection ? A ring with the transducers is placed around the pipe No couplant is required ? Usually no surface preparation required ? Instrumentation is fully portable ? Guided waves are sent in each direction ? Data are collected and stored in the portable instrument ? Reflections are analysed and results