Application of statistical control chart X-Rm for monitoring the water vapor pressure in a thermoelectric power plant
Abstract
The principles of the statistical control chart are satisfactory for identifying situations where assignable causes may be adversely affecting the quality of a process or product. The purpose of this research was designing a control chart for monitoring the water vapor pressure (Pv) in the outlet stream of a vapor
generator in a thermoelectric power plant. Moving range control chart (X-Rm) was selected, this included 1595 measurements coming from a normal distribution. The Center Line was 13,33 MPa, Lower Control Limit 13,22 MPa and Upper Control Limit 13,44 MPa. Non-random variation patterns were identified such as downward and upward trend, downward and upward shift, and data stratification; possibly due to general causes: little standardization, mismatches and gradual deterioration of equipment, instruments and accessories, and deposition of waste. This project is expected to contribute to
the proper use of the installed thermal power capacity.
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