Linebreak detection system
AssigneeLedeen Flow Control Systems, Inc.
InventorsHoward L. Ledeen, Franz Schmon
Life of this patent
Estimating the term…
Abstract
A pipeline break detection system wherein a rate timer valve is opened in response to a predetermined pressure drop to direct pressure fluid to activate the time cycle of an on-delay valve and, itself commence a time delay closing cycle. If its closing countdown continues to completion, it depressurizes the on-delay output valve and cancels its countdown. However, if the pipeline experiences a further like pressure drop, before the rate timer valve closes, it will be recharged and held open to keep the output valve timer actuated. If the pipeline pressure fails to level off to allow the rate timer valve to close, and the output relay is thus enabled to complete its timed cycle, the output relay opens to deliver a fluid signal.
Claims11
A pipeline pressure drop monitoring system comprising:
- means for transmitting an actuating signal in response to each decrease in pipeline pressure of a given increment;
- timing means activated by receipt of an actuating signal to deliver an energizing signal for a predetermined period;
- and
- output means conditioned while a said energizing signal is imposed thereon to deliver an action signal after a timed delay longer than said predetermined period;
- said output means comprising:
- a pressure fluid system;
- and
- an on-delay output valve in said fluid system.
Dependencies are inferred from the claim text.