【文章內(nèi)容簡介】 stance to buildings, gas spreading, gas concentration 量漏點的劃分，必 須 當?shù)厥撬嗦访娴娜細?擴 散和 濃 度 檢測 等。2) After the leak has been removed, inspection in conformance with G 4651 is mandatory. 當漏點消除后，按照 G 4651 要求，需要 強 制性型 檢驗3) Daily to fortnightly unscheduled inspection in winter, depending on risk potential 冬季里的每天直到 2周一次的突發(fā)事件的檢驗，要根據(jù)潛在的風險來制定。DVGW Technical Rules on Gas Pipeline InspectionDVGW關于燃氣管線檢測的技術標準Leak classes and pertinent measures漏點的分類和采取的相關的措施Leak class漏點 類 型Finding 1)發(fā)現(xiàn) 漏氣 邊緣Measure采取的措施Start of measures開始的措施Inspection監(jiān)查 措施Start of repair/reconstruction 2)開始 維 修的 時間B gas found in farther vicinity of building在構筑物 較遠 的附近發(fā)現(xiàn) 燃氣incorporate into repair or reconstruction plan制定 維 修或重建 計劃timing of unscheduled inspection in winter 3)as required按需要制定冬季突 發(fā) 事件 監(jiān)測before winter and/or in acc. with reconstruction plan按照制定 維 修或重建 計 劃入冬前 執(zhí) 行C seepage suggests that gas will not enter building泄露量被 證 明不會 進 入構筑物incorporate into repair or reconstruction plan制定 維 修或重建 計劃timing of unscheduled inspection in winter按需要制定冬季突 發(fā) 事件 監(jiān)測before winter and/or in acc. with reconstruction plan按照制定 維 修或重建 計 劃入冬前 執(zhí) 行1) Leak classification for gas seepage in cavities must be based on concrete local conditions such as distance to buildings, gas spreading, gas concentration 量漏點的劃分，必 須 當?shù)厥撬嗦访娴娜細?擴 散和 濃 度 檢測 等。2) After the leak has been removed, inspection in conformance with G 4651 is mandatory. 當漏點消除后，按照 G 4651 要求，需要 強 制性型 檢驗3) Daily to fortnightly unscheduled inspection in winter, depending on risk potential 冬季里的每天直到 2周一次的突發(fā)事件的檢驗，要根據(jù)潛在的風險來制定。DVGW Technical Rules on Gas Pipeline InspectionDVGW關于燃氣管線檢測的技術標準Gas leak detection and gas concentration measuring devices for leakage surveys on gas installationsG 4654March 2023針對 燃氣設施 的 燃氣檢漏和濃度測量的儀器2023頒布DVGW Technical Rules on Gas Pipeline InspectionDVGW關于燃氣管線檢測的技術標準Scope適用范圍Mobile devices to手持式檢測儀是指：? detect installation leaks— 檢測燃氣設施的泄漏 (public gas distribution and customer installations) on installations designed to transmit gases in accordance with G 260.? Assessment of risk of explosion.? Determination of specific gas ponentsG 4654DVGW Technical Rules on Gas Pipeline InspectionDVGW關于燃氣管線檢測的技術標準Instrumentation for natural gasNote: Explosion protection required for devices used as mobile gas alarms and/or in areas with explosive gasair mixtures or where such mixtures are expected 1) Calibration gas fed into the device including the system of probes must reach its concentration within 10s.Service case Principle of actionMeasuring range Minimum instrumental sensitivitySignal Calibration gasFrequencySurface inspection of buried gas pipelinesFIDgassensitive semiconductor1 – 20,000ppmCH4/C3H81ppm bustible gasfreely adjustable。 . 10ppm10ppm CH41)Sensitivity tests before start of work。 after interruption of work, if necessary (cf. also G 4651, )Inspection of bare gas pipelines, gas pressure regulator stations, natural gas filling stations, naturalgas driven vehicles, installation linesgassensitive semiconductorFID1 – 20,000ppmCH4/C3H81ppm bustible gasconcentrationdependent acoustic signal。 fixed signal at end of measuring range1 % CH4ultrasound qualitative 30l/h bustible gas/inert gas (distance between gas pipeline and device ≤ 10m)Inspection of ground air, air in sewers, pits, change of gas type (missioning and demissioning of gas pipelines)thermal conductivitysonic speed – 100 % CH4/C3H8/CO2 % bustible gas100 % CH4Weekly to 6monthly indication sensitivity tests, depending on service availabilityInspection of indoor air, air in pits and sewers for reaching the LEL thresholdgass