Method for monitoring a pipeline and position regulator for a control valve
AssigneeSiemens Aktiengesellschaft
InventorKlaus-Peter Heer
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for monitoring a pipeline in order to detect the slow reduction of the free inner cross-section by means of the position of a control valve in the pipeline. When the flow rate is essentially constant, a first position is determined and stored at a first moment. According to at least one second position of the control valve, determined at a second, subsequent moment, the point at which the position of the valve exceeds a pre-deterrninable threshold value for a valve opening is determined, and optionally a signal is emitted to indicate that the threshold value has been exceeded and/or the time at which it was exceeded. As a result, suitable maintenance measures can be introduced, before faults occur in the process system.
Claims20
A method for monitoring a pipeline for slow reduction of an internal cross section of the pipeline by using a position of a control valve in the pipeline, wherein an substantially constant flow of a medium through the control valve exists, the method comprising:
- determining and storing a first position of the control valve at a first point in time;
- determining a second position of the control valve later point in time at a second point in time later than the first point in time;
- determining a time at which the position of the valve exceeds a specifiable threshold value for a valve opening;
- and
- outputting a signal to indicate the threshold is exceeded and/or to indicate the time the threshold was exceeded.
A position regulator for a control valve, comprising:
- a position indicator for acquiring a position of the control valve;
- and
- an evaluation device for evaluating the acquired position, wherein the evaluation device is embodied such that when the control valve is used in a control loop to regulate to a constant flow of a medium through a pipeline to monitor the pipeline for slow reduction of a free internal cross section with the aid of a position of the control valve, at a first point in time a first position of the control valve is determined and stored, and wherein at a second, later point in time at least a second position of the control valve is determined, and wherein the time at which the position of the valve exceeds a definable threshold value for valve opening is determined, and wherein a signal to indicate that the threshold has been exceeded and/or the time at which it was exceeded is output.
Dependencies are inferred from the claim text.