真空試驗(yàn)程序

ShandongNuclearPowerEquipmentManufacturingCo.Ltd.PageShandongNuclearPowerEquipmentManufacturingCo.Ltd.Pageof7需要記錄至少15Kpa的負(fù)壓。Thevacuitycanbeformedbyanyofthepracticalandconvenientmethods(suchasairinjector,suctionpump),thevacuumgaugeneedtorecordatleastanegativepressureof15Kpa試驗(yàn)壓力TestPressure依據(jù)API620標(biāo)準(zhǔn)，試驗(yàn)時(shí)應(yīng)保持真空盒內(nèi)壓力為一21Kpa?一35Kpa的壓力。Thepressureinsidetheboxshallbekeptas-21Kpa?-35KpaduringthetestaccordingtoAPI620requirements.壓力保持PressureMaintenance在試驗(yàn)時(shí)，真空盒要保持真空狀態(tài)(負(fù)壓)至少10秒鐘。Thevacuumcondition(negativepressure)shallbemaintainedatleast10sec.whilsttesting.真空盒重疊檢查OverlapofVacuumBox對同一長度連續(xù)焊縫的真空試驗(yàn)，為保證100%試驗(yàn)范圍及檢測結(jié)果的準(zhǔn)確，對真空盒的重疊長度應(yīng)保持50mm。Theoverlaplengthshallbekept50mmtomakesureof100%testingscopeandtheaccuracyoftestresultwhendoingavacuumtesttothecontinuousweldofthesamelength.燈光和視覺觀察LightingandVisualObservation(1)當(dāng)觀察者眼睛距離被測試表面在600mm內(nèi)，視線與被測表面角度在30度以內(nèi)的情況下，可直接進(jìn)行視覺檢測?？梢允褂苗R子來改善視覺角度或者使用放大鏡來輔助檢查。其中對某些特殊部位、部件、容器等的檢測，合適的照明(自然的或外加的白光)是必要的。被測表面的最低光照強(qiáng)度可以是100lux。光照強(qiáng)度、所用技術(shù)、光線等級(jí)證明等需要一次性記錄在檔案上。Directvisualinspectionisdoablewhenthetester’seyeiswithinadistanceof600mmfromthesurfacebeingtestedandthelookangleofeyeandthesurfaceiswithin30°.Mirrorcanbeusedtoimprovethesightangleoruseloupetoassisttheinspection.Suitablelighting(naturaloradscititiouswhitelight)isnecessaryforthetestingofspeciallocations,partsandcontainersthelowestlightingintensityonthesurfacemaybe100lux.Thelightingintensity,techniqueused,lightgradecertificateshallberecordedinthefileone-off.在某些情況下，遠(yuǎn)距離視覺觀察要替代近距離視覺觀察。遠(yuǎn)距離視覺檢查要用到比如鏡子、望遠(yuǎn)鏡等輔助設(shè)備。Closevisualobservationshallbereplacedbydistancevisualobservationinsomecases.Supplementaryappliancesbeingusedtotheclosevisualobservationaremirror,telescopeandsoon.泄露指示LeakageIndication檢測區(qū)域若是有連續(xù)氣泡冒出，說明被檢區(qū)域表面或焊縫有孔道缺陷。Therearedrill-waydefectsonthesurfacebeingtestedorattheweldseamifbubblesgeneratedcontinuouslyfromtheareabeingtested.清潔Cleaning檢測完畢后要按要求將檢測部位清潔使達(dá)到使用要求。Cleanthetestedareaaccordingtorelativerequirementsafterthetesting.■評價(jià)Evaluation泄露缺陷LeakageDefects如相關(guān)規(guī)范無專門說明，則檢驗(yàn)部位若觀察無連續(xù)氣泡產(chǎn)生，就認(rèn)為產(chǎn)品真空檢驗(yàn)合格。Itwillbeconsideredqualifiedifthereisnocontinuousbubbleformingatthetestedlocationwhenthereisnospecificinstructioninrelativecodes.(2)返修/重新檢測Repair/Re-test若焊縫觀察到有泄露部位，則應(yīng)在此部位做上記號(hào)，真空盒排空，缺陷部位按相關(guān)規(guī)范要求進(jìn)行返修，返修后按要求進(jìn)行重新真空檢驗(yàn)。Markthoseleakagelocationsandevacuatethevacuumbox,repairthosedefectsaccordingtorelativecodesrequirements,andre-testingofvacuumisrequiredafterrepair.操作人員資質(zhì)OperatorQualification真空試驗(yàn)操作人員的資質(zhì)依照ASMEIIINE-5500的要求執(zhí)行。Qualificationofvacuumtestoperatorshallbeconsistentwit