Neubrex Co., Ltd. - example(step5)

Power plant steam-pipe monitoring

Power plant steam-pipe monitoring

Workflow & power plant application example

The data analysis algorithm depends on the diameter of monitored pipe.

Pipe diameter 4 inches or more
PPP-BOTDA* system offers 10 cm spatial resolution and thus provides enough measurement points for 3D inverse analysis. Inverse analysis enables the quantitative assessment (location, thinning size, remaining thickness etc.) of pipeline state.Note: *PPP-BOTDA = Pulse Pre-Pump Brillouin Optical Time Domain Analysis

Measuring point

Pipe diameter less than 4 inches
On the small-diameter pipe, the number of measurement points is lower than required for full 3D inverse analysis and qualitative or semi-quantitative methods are employed.

Qualitative analysis	Specify possible thinning location
	Determine UT inspection priority level
Semi-quantitative analysis	Set strain threshold value, thinning level, and corresponding
		warning level


Quantitative analysis is performed by means of inverse methods. Pipe thickness is estimated, location, and thinning shape is estimated using distributed strain data.
Pre-processing: Prepare the 3D mesh model / Apply boundary
	condition*
Analysis: Estimate the thinning shape and location
	*Boundary condition: load superposition principle

Qualitative analysis and alarm setting can be performed using threshold-based analysis of the measured data.

Neubrex Co., Ltd. Sakaemachidori 1-1-24, Chuo-ku, Kobe, Hyogo, 650-0023 JAPAN [map]