上海克罗斯阀门有限公司 Shanghai CLOS Valve Co., Ltd Trevitest on-line valve testing 安全阀在线校验 Delivering improved valve efficiency 提高和改善阀门的工作效率

Why Trevitest? 为什么要采用安全阀在线校验装置 Trevitest on-line valve testing Why Trevitest? 为什么要采用安全阀在线校验装置 Replacing the boiler float gives the following advantages代替水压测试,具有如下优点 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 tear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

Traditional set-point Trevitest on-line valve testing Traditional set-point verification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和记录阀门的设定压力 Limitations 局限性 Uneconomical - increased fuel costs不经济-增加了燃料成本 Compromises plant safety - unnecessarily raising 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

What is Trevitest On-linevalve testing? 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 pressure 安全阀在线校验装置 1979年出现,不必提高在线运行压力,就可以对安全阀的设定压力进行校正和记录.

The advantages of Trevitest Trevitest on-line valve testing The advantages of Trevitest For routine inspection: 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 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 outages Enables longer periods between outages to be planned For corrective action: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 indications for valve’s 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 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 extended可以２０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 equipment in place on safety relief valve Trevitest on-line valve testing Trevitest equipment in place on safety relief valve

Calculations: Set pressure verification Trevitest on-line valve testing Calculations: Set pressure verification 安全阀设定压力校正的计算 TO DETERMINE SET PRESSURE确定设定压力  Pstt = Ftt/MSA + Pl Where: 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 Pstt1 = first Trevitest set pressure Pstt2 = second Trevitest set pressure X = spring adjustment

Extended running and re-certification 延长运行寿命 Trevitest on-line valve testing Extended running and re-certification 延长运行寿命 Incorporating Trevitest as part of the valve overhaul strategy will increase intervals between shutdowns (benchmarking) 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．

System pressure and back-pressure Trevitest on-line valve testing System pressure and back-pressure 带背压和不带背压的系统 A major part of the Trevitest 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＋／－０.5%. 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.但必须附加一个波纹管.

Trevitest accuracy : Load cell calibration rig 安全阀在线校验的精度保证,负荷单元工作原理 Trevitest on-line valve testing   Trevitest accuracy : Load cell calibration rig 安全阀在线校验的精度保证,负荷单元工作原理

Trevitest Equipment: Recent developments 近期的发展 Trevitest on-line valve testing Trevitest Equipment: Recent developments 近期的发展 Rugged computers used during the test Data acquisition and management now computerised Acoustic transducer added to monitor valve leakage and aid set pressure reading Customer data base for all valves Increased accuracy- set point can be magnified

What valves can be Trevitested? Trevitest on-line valve testing What valves can be Trevitested? 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 compromised Pilot operated valves equipped with field test port PV valve closed (normal position)

How to establish if a valve can be Trevitested? Trevitest on-line valve testing How to establish if a valve can be Trevitested?

Trevitesting valves with back pressure Trevitest on-line valve testing Trevitesting valves with back pressure

Trevitest compatibility Trevitest on-line valve testing Trevitest compatibility Example of valve information required to establish Trevitest compatibility

Extended running and re-certification Trevitest on-line valve testing Extended running and re-certification Incorporating the use of the Trevitest System with a valve overhaul strategy will save customer’s time and money; by increased intervals between shutdowns (Benchmarking) Valves can be re-certified in-situ to allow a system to comply with plant regulations

Pre-requisite form Trevitest on-line valve testing Recessed spindle (as diagram B)

Companies using Trevitest Trevitest on-line valve testing Companies using Trevitest GPIC Bahrain QAFCO Qatar PDO Oman PGS Production (Banff) Bleo Holm Britannia Shell Expro:- (Gannet, North Cormorant, Cormorant Alpha) BHP Douglas Shell Stanlow BP Mobil/Exxon Transco Glaxo Smith Kline ADGAS UAE KNPC Kuwait Conoco Huntsman L.O.R. Esso Texaco Baker Petrolite Hydro Polymers British Gas British Energy BNFL/Magnox