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|NDT.net Issue - 2014-10 - NEWS ||NDT.net Issue: 2014-10|
Publication: e-Journal of Nondestructive Testing (NDT) ISSN 1435-4934 (NDT.net Journal)
SteamPAC™ Surveys Steam Valves and Traps While In Service!MISTRAS Products & Systems72, Princeton Junction, NJ, USA
Handheld leak detection system identifies and quantifies through-valve loss of normally-closed steam valves for power generation. LOST STEAM EQUALS LOST DOLLARS
The closed loop design of a boiler directs the steam through the most efficient path for producing electricity. Thermal efficiency in a plant is the amount of steam produced versus the amount of steam that ultimately reaches the turbine. Each leaking valve along the path contributes to a reduction in efficiency. These losses require more fuel to provide the same energy at the turbine, increasing costs and stack emissions.
As the power fleet ages, so do the primary components of the plant. From isolation and stop valves to vent and relief valves, continual repair and replacement of these components is necessary to keep plants operating at optimal efficiency. Identifying the valves that are allowing the greatest loss is a critical tool in the financial management of a plant.
Loss Calculation Software Data Screenshot
THE RIGHT TOOL FOR THE JOB!
SteamPAC™, with a powerful formula for estimating leak rates, is used in fossil fuel plants to survey the entire inventory of steam valves and traps while in service. This results in positive impacts on Heat Rate and CO2 stack emissions.
The SteamPAC™ sensor “listens” to the turbulence created during expansion of high pressure liquids and gasses passing through a small opening.
STEAMPAC™ LOSS EXAMPLE
Typical 400 MW Pulverized Coal Boiler
Thermally Efficient Pulverized Coal Boiler (PCB)
Less Efficient Pulverized Coal Boiler (PCB)
Savings in fuel cost with increased thermal efficiency... At $14/ton of coal, fuel cost savings is $1100/hour ($26,400/day) by reducing loss of steam through normally closed valves - reduction of 84 tons of O2/day.
High frequency detection is not susceptible to normal operating background noise and vibration, virtually eliminating false positives seen by airborne detection.
SteamPAC™ uses a proprietary algorithm to identify through-valve gas losses and estimates leak rate. Using the readings from SteamPAC™ along with the valve type, size and differential pressure, the calculations are performed within the handheld or the supplied software.
The route-based user interface is simple and intuitive. A single button press will store readings from a valve. Wirelessly transferring the readings to a computer provides trend analysis and leak cost equivalents to justify repair and replacement. A LONG HISTORY OF IDENTIFYING LEAKS
MISTRAS | Triple 5 has been identifying boiler tube leaks for over 25 years. The Acoustic Monitoring System (AMS) is installed in over 100 power plants around the world, has identified 1000’s of leaks, saving plants millions of dollars.
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