Abstract: A personal computer is operated in conjunction with an in line flow computer to provide real time flow data on the personal computer screen. Pipeline flow can be regulated and directed from the personal computer by flow control valves and by motor operated valves via a programmable logic controller and by the flow computer.

Abstract: Pulse rate multiplying circuitry is responsive to an input pulse train for generating an output pulse train having a number of pulses which is a selected multiple of the number of pulses in the input pulse train. That is, the pulse rate multiplying circuitry produces exactly a selected multiple of output pulses for each input pulse so that the frequency of the output pulse train is the selected multiple of the frequency of the input pulse train. Preferably, the pulses in the output pulse train are uniformly distributed in time. That is, the output pulses generated in response to each input pulse are equally spaced and evenly distributed over the time interval between consecutive input pulses. The pulse rate multiplying circuitry includes an up/down counter incremented by pulses in the input pulse train.

Abstract: A monitor is disclosed which indicates a series of short-term losses of fluid between any two stations along a fluid flow system such as a refinery or pipeline. The series of short-term losses relates to a chain of intervals of operation of the fluid flow system. A sudden disturbance in the operation of the fluid flow system during an interval of operation is smoothed over a selectively variable number of short-term loss indications in the series rather than being reflected entirely in the short-term loss indication for the interval of operation in which the sudden disturbance occurs. On the other hand, actual changes in the operation of the fluid flow system are averaged over the selectively variable number of short-term loss indications in the series so that rapid changes as well as gradual changes in the operation of the fluid flow system result in a trend in the series of short-term loss indications.