초록 ▼

Disclosed is an instrument wherein the pressure or flow of a fluid in a pipeline is monitored with a voltage proportional thereto being electronically differentiated to determine whether any rate of change of pressure exists, which is often indicative of a leak in the pipeline. If a rate of pressure

Disclosed is an instrument wherein the pressure or flow of a fluid in a pipeline is monitored with a voltage proportional thereto being electronically differentiated to determine whether any rate of change of pressure exists, which is often indicative of a leak in the pipeline. If a rate of pressure change of a predetermined extent exists for a predetermined period of time and if a total pressure change exceeds a predetermined value, an output signal can close a valve in the pipeline or can sound an alarm. In addition, in situations where a liquid is involved, a surge develops upon a line break, that is, a large rate of instantaneous pressure drop, and such surge can also be detected and appropriate remedial measures taken. The instrument is also capable of shutting down the pipeline in instances of inordinately low or high pressure conditions.

대표청구항 ▼

A system for detecting irregularities in a fluid carrying pipeline or the like comprising; transducer means monitoring a characteristic of the fluid in the pipeline and providing an output signal proportional thereto; differentiator means receiving the output signal of said transducer means and prov

A system for detecting irregularities in a fluid carrying pipeline or the like comprising; transducer means monitoring a characteristic of the fluid in the pipeline and providing an output signal proportional thereto; differentiator means receiving the output signal of said transducer means and providing an output signal proportional to the rate of change of said characteristic with respect to time; comparator means receiving the output signal of said differentiator means, comparing that output signal with a preselected rate of change of said characteristic with respect to time and providing an output signal when the output signal of said differentiator means exceeds said preselected rate of change; timing means receiving the output signal of said comparator and providing an output signal after a predetermined time delay; said output signal of said timing means Being indicative of an irregularity in the fluid pipeline of sufficient size to warrant correction.