Using Acoustic Emission Leak Detection

Improving Performance For Over 30 Years

Plant Improvement

Coal Creek 1 ~150 Btu /KwHr

Council Bluffs ~90 Btu /KwHr

Coronado Generating 9.9 MW

North Anna 7.0 MW

Comanche Peak 1 & 2 4.4 MW

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Increased plant efficiency

Optimize PM Repair Scheduling

Lower valve maintenance cost

Confirm effectiveness of repairs

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P&ID Review, Custom Database Creation

Custom Troubleshooting Plans

Loss Potential Analysis & Report

On-Site Testing & Preliminary Report

Conclusion Review by Senior Staff

Final Report –

Pre- Outage - Repair Recommendation & Loss Analysis

Post-Outage - Confirmation of Repair & Loss Recovery Analysis

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Main Steam

Gland Seal Steam

Hot & Cold Reheat

Turbine Drains

Extraction Steam

Feedwater

Condensate

Heater Drains

Boiler Vents and Drains

Aux Steam

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Normally CLOSED valves and Traps

Delta-P across valve

On the Piping

On the valve body

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Operations Approved

Manipulation Steps

No Flow Interruptions

Return to Normal

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Signature Comparison Method

Differential Signature Method

Time-Sweep Signatures

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Two Signatures Taken

(with & without pressure)

The Signature Comparison Method

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Multiple Signatures Taken

Upstream, downstream, and on the valve.

The Differential Signature Method

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2-Minute Signature Taken Records and displays

the opening and closing of the trap.

May Indicate the Trap is: Open or Oversized

Open Too Often

Open Too Long

Stuck Shut

Trap Block Valves Leaking

The Time Sweep Method

LargeEaten through the hard metal & is damaging the soft metal

MediumDamaging the hard metal, but not the soft metal.

SmallMay show no internal damage.

Long term history shows they don’t grow

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Loss Potential Analysis

Completed Prior to On-Site Testing

Used to evaluate test population

Identifies Priority of Testing

Loss Analysis

Completed by Senior staff upon receipt of test results

Utilizes survey data & conclusions

Evaluates and Ranks Leak Results & Prioritizes RepairsBased on economic impact

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List of Leakers

Output Recovery

List of Tight Valves

Repair Recommendations

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Twelve (12)

High-Value Targets: $4,197,212

Twenty Two (22)Medium-Value Targets:

$5,171,795

Ten (10)

Low-Value Targets: $5,208,054

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Valves, In Order of Leakage to be Recovered

Sample Fossil Unit 1 Cycle Isolation Recovery Potential October 2008

Nominal Rated Output 1,400 MW Capacity Factor 80% Annual

Nominal Heat Rate 9,750 Btu/kW-Hr Outage Interval 36 Months

Fuel Cost $3.68 per MM Btu Cycle Isolation Loss 49 Btu/kW-Hr

Provide P&ID’s and Heat Balance

Operating Parameters

Outage Cycle (Months)

MW Rating & Capacity Factor

Fuel Replacement Cost

Insulation Inspection Holes

Operations Support

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All-Inclusive

Fixed Price

No Hidden Fees

Clearly Defined Deliverables

Objective evaluation of leaks

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Leak Detection Services, Inc.

Comprehensive Testing & Analysis

of Critical Valves & Traps