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

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

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

Replacing the boiler float gives the following advantages 代替水压测试 , 具有如下优点

Trevitest on-line valve testing

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

Trevitest on-line valve testing

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 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 on-line valve testing

Trevitest equipment in place on safety relief valve

Trevitest on-line valve testing

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

Where:Pstt1 = first Trevitest set pressure

Pstt2 = second Trevitest set pressure

X = spring adjustment

Calculations: Set pressure verification

安全阀设定压力校正的计算

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．

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 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 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

Trevitest on-line valve testing

What valves can be Trevitested?

Trevitest on-line valve testing

PV 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 compromised

Pilot operated valves equipped with field test port

How to establish if a valve can be Trevitested?

Trevitest on-line valve testing

Trevitesting valves with back pressure

Trevitest on-line valve testing

Trevitest on-line valve testing

Example of valve informationrequired to establish Trevitest compatibility

Trevitest compatibility

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

Extended running and re-certification

Trevitest on-line valve testing

Pre-requisite form

Trevitest on-line valve testing

Recessed spindle(as diagram B)

Companies using Trevitest

ADGAS UAE

KNPC Kuwait

Conoco

Huntsman

L.O.R.

Esso

Texaco

Baker Petrolite

Hydro Polymers

British Gas

British Energy

BNFL/Magnox

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

Trevitest on-line valve testing