combined cycle Gas turbine leak Detection

Specificaons subject to change without noce. Copyright © 2010 MISTRAS Group, Inc. All Rights Reserved. www.mistrasgroup.com International Division UNITED KINGDOM: Norman Way • Over Cambridge, CB24 5QE • UK T: +44(0)1954.231.612 • F: +44(0)1954.231.102 E-MAIL: [email protected] CANADA T: +1.403.556.1350 CHINA T: +86.10.5877.3631 FRANCE T: +331.498.26040 GERMANY T: +49.040 2000.4025 GREECE T: +30.210.2846.801-4 HOLLAND T: +31.010.245.0325 INDIA T: +91.22.2586.2444 JAPAN T: +81.33.498.3570 MALAYSIA T: +60.9.517.3788 MIDDLE EAST T: +973.17.729.356 RUSSIA T: +7495.789.4549 SCANDINAVIA T: +46.031.252040 S. AMERICA T: +55.11.3082.5111 USA T: +1.609.716.4000 PHYSICAL ACOUSTICS LIMITED #410A-11100-01 HealtH & Safety executive (HSe) iSSueS ReviSeD GuiDaNce ON GaS tuR- BiNe Safety HSE has launched a revised edion of its suc- cessful Guidance Note ‘Control of safety risks at gas turbines used for power generaon’ (*Guidance Note PM 84). “Once a gas turbine is in service, a regular scheme of inspecon for leaks should be de- veloped and implemented”. “All potenal opons for carrying out the work from outside the (acousc) enclosure should be considered first before allowing entry. In- strumentaon with remote indicaon should be used to avoid roune entry”. tecHNOlOGy fOR Safety PeRfORmaNce aND OPtimiSatiON Of GaS tuRBiNeS The Combined Cycle Gas Turbine (CCGT_ Acousc Leak Detecon System monitors cri- cal areas of the turbine for gas/air leaks and provides instantaneous feedback to the on- site distributed control system (DCS). In the event of a high pressure gas/air leak, an air- borne ultrasonic signal will be generated. This signal is detectable by sensors located around the inside of the acousc enclosure. The sensors are tuned to listen for high pressure leaks and have a significantly reduced sensivity to the normal background noise produced by the turbine. The signal from each sensor is processed by a small unit adjacent to the sensor which has an industrial standard 4-20ma power/signal output to its safety bar- rier housed outside the enclosure. From here the signals go to the plant DCS and the high frequency acousc noise levels (dBAE) are cal- culated, displayed over me, and correlated with plant condions. An alarm may be generated for any abnormal condion. Approximate source locaon can be obtained from the relave ultrasonic signals. combined cycle Gas turbine leak Detecon Product Application ccGt leak Detecon Benefits • Simple to install and operate. • Instantaneous detecon of both gas and air leaks. • Technology offers approximate source locaon. • Cerfied as intrinsically safe: ATEX II 1 G D and EEx ia IIC T4. • 4-20ma outputs to plant distributed control system. • Prevents serious damage to gas turbine: Detecon of air leaks at an early stage in development. • Conformity to HSE guidance note PM 84: Reducing requirement for entry into turbine enclosure. • Supplements convenonal exit air sam- pling systems Sensor locaons within Acousc Enclosure

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Transcript of combined cycle Gas turbine leak Detection

Page 1: combined cycle Gas turbine leak Detection

InternationalDivision

UNITED KINGDOM:Norman Way • Over Cambridge, CB24 5QE • UKT: +44(0)1954.231.612 • F: +44(0)1954.231.102E-MAIL: [email protected]

CANADA T: +1.403.556.1350CHINA T: +86.10.5877.3631FRANCE T: +331.498.26040 GERMANY T: +49.040 2000.4025GREECE T: +30.210.2846.801-4

HOLLAND T: +31.010.245.0325INDIA T: +91.22.2586.2444JAPAN T: +81.33.498.3570MALAYSIA T: +60.9.517.3788MIDDLE EAST T: +973.17.729.356

RUSSIA T: +7495.789.4549SCANDINAVIA T: +46.031.252040S. AMERICA T: +55.11.3082.5111USA T: +1.609.716.4000

PHYSICALACOUSTICSLIMITED

#410A-11100-01

HealtH & Safety executive (HSe) iSSueS ReviSeD GuiDaNce ON GaS tuR-BiNe SafetyHSE has launched a revised edition of its suc-cessful Guidance Note ‘Control of safety risks at gas turbines used for power generation’ (*Guidance Note PM 84).

“Once a gas turbine is in service, a regular scheme of inspection for leaks should be de-veloped and implemented”.

“All potential options for carrying out the work from outside the (acoustic) enclosure should be considered first before allowing entry. In-strumentation with remote indication should be used to avoid routine entry”.

tecHNOlOGy fOR Safety PeRfORmaNce aND OPtimiSatiON Of GaS tuRBiNeSThe Combined Cycle Gas Turbine (CCGT_ Acoustic Leak Detection System monitors criti-cal areas of the turbine for gas/air leaks and provides instantaneous feedback to the on-site distributed control system (DCS). In the event of a high pressure gas/air leak, an air-borne ultrasonic signal will be generated. This signal is detectable by sensors located around the inside of the acoustic enclosure.

The sensors are tuned to listen for high pres-sure leaks and have a significantly reduced sensitivity to the normal background noise produced by the turbine. The signal from each sensor is processed by a small unit adjacent to the sensor which has an industrial standard 4-20ma power/signal output to its safety bar-rier housed outside the enclosure. From here the signals go to the plant DCS and the high frequency acoustic noise levels (dBAE) are cal-culated, displayed over time, and correlated with plant conditions.

An alarm may be generated for any abnormal condition. Approximate source location can be obtained from the relative ultrasonic signals.

combined cycle Gas turbine leak Detection

Product Application

ccGt leak Detection Benefits • Simple to install and operate.

• Instantaneous detection of both gas and air leaks.

• Technology offers approximate source location.

• Certified as intrinsically safe: ATEX II 1 G D and EEx ia IIC T4.

• 4-20ma outputs to plant distributed control system.

• Prevents serious damage to gas tur-bine: Detection of air leaks at an early stage in development.

• Conformity to HSE guidance note PM 84: Reducing requirement for entry into turbine enclosure.

• Supplements conventional exit air sam-pling systems

Sensor locations within Acoustic Enclosure