Set-pressure-verification-安全閥設(shè)定壓力校正的計算Trevitest-on-line課件

1、上?？肆_斯閥門有限公司 Shanghai CLOS Valve Co., LtdTrevitest on-line valve testing 安全閥在線校驗Delivering improved valve efficiency 提高和改善閥門的工作效率Why Trevitest?為什么要采用安全閥在線校驗裝置Reduction in fuel costs降低燃料成本Reduction in commissioning time減少系統(tǒng)試車時間Reduction in valve wear and tear減少閥門的磨損Reduction in vessel pressure excursi

2、ons leading to longer life減少容器壓力的偏離從而延長使用壽命Controlled testing at lower pressure在正常操作溫度下進行實驗,不需要溫度補償調(diào)整壓力Replacing the boiler float gives the following advantages代替水壓測試,具有如下優(yōu)點Trevitest on-line valve testing Trevitest on-line valve testingTraditional set-point verification傳統(tǒng)的閥門校驗Traditional set-point t

3、esting involves raising line pressure and recording the set-point of the valve傳統(tǒng)的閥門校驗需要提高在線壓力和記錄閥門的設(shè)定壓力Limitations 局限性Uneconomical - increased fuel costs不經(jīng)濟-增加了燃料成本Compromises plant safety - unnecessarily raising line pressure由于不必要的提高在線運行壓力,影響系統(tǒng)安全Environmental - high levels of noise有噪聲污染 Trevitest o

4、n-line valve testingWhat is Trevitest On-linevalve testing? 什么是安全閥在線校驗 Trevitest is a system developed allow the set pressure of safety valves to be verified and recorded without the need to raise line pressure安全閥在線校驗裝置 1979年出現(xiàn),不必提高在線運行壓力,就可以對安全閥的設(shè)定壓力進行校正和記錄.The advantages of Trevitest For routine i

5、nspection: 對于正常檢驗而言Eliminates the need to shut down the process避免系統(tǒng)停車Valve re-certification on-line (set pressure verification)閥門的設(shè)定壓力調(diào)整可在線進行Eliminates the need for temperature compensation由于在正常操作溫度下進行實驗，不需要溫度補償調(diào)整壓力Enables valves to be aligned to delayed outagesEnables longer periods between outages

6、 to be planned For corrective action:對于校正活動而言Testing valve for operational readiness測試閥門為系統(tǒng)運行做準(zhǔn)備Measuring valve lift可以測試閥門的起跳Provide good indications for valves blow-down settings可以指示出閥門的排放設(shè)定Provide good indication for spring performance可以指示彈簧性能Set pressure upgrading on-line upon plant requirement可根

7、據(jù)工廠要求,提升設(shè)定壓力 For safety:從安全性的角度Valve is free to operate with the mechanics in place.通過機械裝置來操作閥門Remote operation typically 20m but can be extended可以米遠的距離遙控操作操作距離也可以延長Equipment available to work in hazardous areas設(shè)備可以在危險環(huán)境下工作Secure baseplate enables valve to be forced closed安全底板可以使閥門強制關(guān)閉 Trevitest on-

8、line valve testingTrevitest equipment in place on safety relief valve Trevitest on-line valve testingTO DETERMINE SET PRESSURE確定設(shè)定壓力Pstt = Ftt/MSA + PlWhere: Pstt = set pressure as predicted by Trevitest設(shè)定壓力Ftt = force recorded by Trevitest 作用力MSA = valve mean seat area閥門密封面的面積Pl = pressure in line

9、(zero for cold testing)系統(tǒng)在線壓力TO DETERMINE VALVE SPRING ADJUSTMENT RATE(Pstt1 Pstt2) / X Where:Pstt1 = first Trevitest set pressurePstt2 = second Trevitest set pressureX = spring adjustmentCalculations: Set pressure verification安全閥設(shè)定壓力校正的計算 Trevitest on-line valve testingExtended running and re-certi

10、fication延長運行壽命 Incorporating Trevitest as part of the valve overhaul strategy will increase intervals between shutdowns (benchmarking) and save customers time and money應(yīng)用安全閥在線校驗裝置在閥門的維護方面，可以增加系統(tǒng)停車的間隔時間從而為客戶節(jié)省時間和成本Valves can be recertified in-situ to allow a system to comply with plant regulations閥門可

11、以在線校驗從而使系統(tǒng)滿足工廠的總體要求Trevitest on-line valve testingSystem pressure and back-pressure帶背壓和不帶背壓的系統(tǒng)A major part of the Trevitest set pressure calculation is the line pressure. This must be accurately determined, typically +/- 0.5%安全閥設(shè)定壓力計算的一個主要部分是系統(tǒng)壓力這必須精確確定通常誤差在.5%.Valves with no back pressure can be Tr

12、evitested無背壓的閥門能夠在線校驗Valves with a back pressure can also be Trevitested, but they must have a bellows fitted帶背壓的閥門也可以在線校驗.但必須附加一個波紋管. Trevitest on-line valve testingTrevitest accuracy : Load cell calibration rig安全閥在線校驗的精度保證,負荷單元工作原理 Trevitest on-line valve testing Trevitest Equipment: Recent develo

13、pments 近期的發(fā)展Rugged computers used during the testData acquisition and management now computerisedAcoustic transducer added to monitor valve leakage and aid set pressure readingCustomer data base for all valvesIncreased accuracy- set point can be magnifiedTrevitest on-line valve testing What valves c

14、an be Trevitested? Trevitest on-line valve testingPV valve closed (normal position)As a general rule: Valves 1” nb. and greater with a protruding spindle/stem. A low force rig may be used for very small valves accuracy can be compromisedPilot operated valves equipped with field test portHow to estab

15、lish if a valve can be Trevitested?Trevitest on-line valve testingTrevitesting valves with back pressureTrevitest on-line valve testing Trevitest on-line valve testingExample of valve informationrequired to establish Trevitest compatibilityTrevitest compatibilityIncorporating the use of the Trevites

16、t System with a valve overhaul strategy will save customers time and money; by increased intervals between shutdowns (Benchmarking)Valves can be re-certified in-situ to allow a system to comply with plant regulationsExtended running and re-certificationTrevitest on-line valve testingPre-requisite form Trevitest on-line valve testingRecessed spindle(as diagram B)Companies using TrevitestADGAS UAE KNPC KuwaitConocoHuntsmanL.O.R.EssoTexacoBaker PetroliteHydro Pol