Internal valve leakage in a natural gas pipeline seriously impairs the safe operation on
pipelines, and the recognition of leakages has therefore been a major concern of the …

The applications of acoustic emission (AE) technique in detection of valves are presented in
this review, and the theoretical models and experimental results of nondestructive detection …

The detection of acoustic emission (AE) signals produced by liquid and gas leakage through
valves can be related directly to the qualitative leakage rate. This allows for cost estimation …

This paper estimates the leakage rate of a valve in a natural gas pipeline via factor and
cluster analysis of acoustic emission signals. Factor analysis was used to reduce the amount …

The internal leakage signal of a valve is generally weak, and it is vulnerable to complex
background noise. Due to the limitations of traditional internal leakage diagnosis methods …

Acoustic emission (AE) can be used to detect and determine the internal leakage rate
through a valve in many applications. However, a general AE data acquisition system is …

Large-diameter ball valves are primarily applied in oil and gas long-distance pipelines for
emergency shutdown. Due to the problems of friction between the transmission medium and …

This paper describes a method for the identification of valves' failure, with the final aim of
creating a predictive maintenance architecture. After revising the scientific literature, we …

Smart pneumatic systems represent a major part of overall actuation systems, close to
electric and hydraulic systems as market share. Considering this, fault detection and …

We herein describe the results obtained from a set of experiments conducted on a shut-
down valve, the objective of which was to identify the degree of internal leakage through the …