Set-pressure-verification-安全阀设定压力校正的计算Trevitest-on-line课件.ppt

1、上海克罗斯阀门有限公司上海克罗斯阀门有限公司 Shanghai CLOS Valve Co.,LtdTrevitest on-line valve testing 安全阀在线校验安全阀在线校验Delivering improved valve efficiency 提高和改善阀门的工作效率提高和改善阀门的工作效率Why Trevitest?为什么要采用安全阀为什么要采用安全阀在线校验装置在线校验装置Reduction in fuel costs降低燃料成本Reduction in commissioning time减少系统试车时间Reduction in valve wear and tea

2、r减少阀门的磨损Reduction in vessel pressure excursions leading to longer life减少容器压力的偏离从而延长使用寿命Controlled testing at lower pressure在正常操作温度下进行实验,不需要温度补偿调整压力Replacing the boiler float gives the following advantages代替水压测试代替水压测试,具有如下优点具有如下优点Trevitest on-line valve testing Trevitest on-line valve testingTraditio

3、nal set-point verification传统的阀门校验传统的阀门校验Traditional set-point testing involves raising line pressure and recording the set-point of the valve传统的阀门校验需要提高在线压力传统的阀门校验需要提高在线压力和记录阀门的设定压力和记录阀门的设定压力Limitations 局限性局限性 Uneconomical-increased fuel costs不经济-增加了燃料成本 Compromises plant safety-unnecessarily raisin

4、g line pressure由于不必要的提高在线运行压力,影响系统安全 Environmental-high levels of noise有噪声污染 Trevitest on-line valve testingWhat is Trevitest On-linevalve testing?什么是安全阀在线校验什么是安全阀在线校验 Trevitest is a system developed allow the set pressure of safety valves to be verified and recorded without the need to raise line p

5、ressure安全阀在线校验装置安全阀在线校验装置 1979年出现年出现,不必提高在线不必提高在线运行压力运行压力,就可以对安全阀的设定压力进行校正就可以对安全阀的设定压力进行校正和记录和记录.The advantages of Trevitest For routine inspection:对于正常检验而言对于正常检验而言Eliminates the need to shut down the process避免系统停车Valve re-certification on-line(set pressure verification)阀门的设定压力调整可在线进行Eliminates the

6、need for temperature compensation由于在正常操作温度下进行实验，不需要温度补偿调整压力Enables valves to be aligned to delayed outagesEnables longer periods between outages to be planned For corrective action:对于校正活动而言对于校正活动而言Testing valve for operational readiness测试阀门为系统运行做准备Measuring valve lift可以测试阀门的起跳Provide good indication

7、s for valves blow-down settings可以指示出阀门的排放设定Provide good indication for spring performance可以指示弹簧性能Set pressure upgrading on-line upon plant requirement可根据工厂要求,提升设定压力 For safety:从安全性的角度从安全性的角度Valve is free to operate with the mechanics in place.通过机械装置来操作阀门Remote operation typically 20m but can be exte

8、nded可以米远的距离遥控操作操作距离也可以延长Equipment available to work in hazardous areas设备可以在危险环境下工作Secure baseplate enables valve to be forced closed安全底板可以使阀门强制关闭 Trevitest on-line valve testingTrevitest equipment in place onsafety relief valve Trevitest on-line valve testingTO DETERMINE SET PRESSURE确定设定压力确定设定压力 Pst

9、t=Ftt/MSA +PlWhere:Pstt =set pressure as predicted by Trevitest设定压力 Ftt =force recorded by Trevitest 作用力 MSA =valve mean seat area阀门密封面的面积Pl =pressure in line(zero for cold testing)系统在线压力 TO DETERMINE VALVE SPRING ADJUSTMENT RATE(Pstt1 Pstt2)/X Where:Pstt1=first Trevitest set pressurePstt2=second Tr

10、evitest set pressureX =spring adjustmentCalculations:Set pressure verification安全阀设定压力校正的计算安全阀设定压力校正的计算 Trevitest on-line valve testingExtended running and re-certification延长运行寿命延长运行寿命 Incorporating Trevitest as part of the valve overhaul strategy will increase intervals between shutdowns(benchmarkin

11、g)and save customers time and money应用安全阀在线校验装置在阀门的维护方面，可以增加系统停车的间隔时间从而为客户节省时间和成本Valves can be recertified in-situ to allow a system to comply with plant regulations阀门可以在线校验从而使系统满足工厂的总体要求Trevitest on-line valve testingSystem pressure and back-pressure带背压和不带背压的系统带背压和不带背压的系统A major part of the Trevites

12、t set pressure calculation is the line pressure.This must be accurately determined,typically+/-0.5%安全阀设定压力计算的一个主要部分是系统压力这必须精确确定通常误差在.5%.Valves with no back pressure can be Trevitested无背压的阀门能够在线校验Valves with a back pressure can also be Trevitested,but they must have a bellows fitted带背压的阀门也可以在线校验.但必须附

13、加一个波纹管.Trevitest on-line valve testing Trevitest accuracy:Load cell calibration rig安全阀在线校验的精度保证安全阀在线校验的精度保证,负荷单元工作原理负荷单元工作原理 Trevitest on-line valve testing Trevitest Equipment:Recent developments 近期的发展近期的发展Rugged computers used during the testData acquisition and management now computerisedAcoustic

14、 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 can be Trevitested?Trevitest on-line valve testingPV valve closed(normal position)As a general rule:Valves

15、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 establish if a valve can be Trevitested?Trevitest on-line valve testingTrevitesting valves with back pressureTrevites

16、t on-line valve testing Trevitest on-line valve testingExample of valve informationrequired to establish Trevitest compatibilityTrevitest compatibilityIncorporating the use of the Trevitest System with a valve overhaul strategy will save customers time and money;by increased intervals between shutdo

17、wns(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 KuwaitCono

18、coHuntsmanL.O.R.EssoTexacoBaker PetroliteHydro PolymersBritish GasBritish EnergyBNFL/MagnoxGPIC BahrainQAFCO QatarPDO OmanPGS Production(Banff)Bleo HolmBritanniaShell Expro:-(Gannet,North Cormorant,Cormorant Alpha)BHP DouglasShell StanlowBPMobil/ExxonTranscoGlaxo Smith Kline Trevitest on-line valve testing