The computer-implemented method of claim 17, wherein the blend rate is based on a predetermined vapor pressure for the blended gasoline and butane.

The computer-implemented method of claim 17, further comprising the steps of: receiving a third measurement indicating a vapor pressure of the blend of the gasoline stream and the butane stream; and generating a report comprising the third measurement. view more

A computer-implemented method for blending a butane stream and a gasoline stream comprising the steps of: receiving a first measurement indicating a vapor pressure of the gasoline stream; calculating a blend rate at which the butane stream can be blended with the gasoline stream; transmitting an instruction to a programmable logic controller for adjusting the butane stream to the calculated blend rate for blending with the gasoline stream and distributing at a rack; and receiving a second measurement indicating a vapor pressure of the blended gasoline stream and butane stream. view more

The computer-implemented method of claim 31, further comprising the step of generating a report comprising the second measurement.

The system of claim 2 wherein the ratio input signal is derived from a calculation of the ratio of butane and gasoline that will yield a desired vapor pressure.

The method of claim 14, wherein the step of determining the blend ratio comprises:</claim-text> a) setting a predetermined value for the vapor pressure of the blend; b) transmitting the predetermined value for the vapor pressure of the blend to a ssing unit; c) transmitting the gasoline vapor pressure and the butane vapor pressure to the processing unit; d) calculating the blend ratio from the gasoline vapor pressure, the butane vapor pressure, and the predetermined value for the vapor pressure of the blend. view more

The method of claim 16, further comprising:</claim-text> a) transmitting a signal that corresponds to the vapor pressure of the blend from the processing unit to a programmable logic control; and b) adjusting the ratio of butane and gasoline blended e blending unit with the programmable logic control. view more

A method for simplifying record keeping requirements for butane use at a petroleum products tank farm comprising:</claim-text> a) drawing a gasoline stream from a tank of gasoline; b) drawing a butane stream from a tank of butane; c) blending the e stream and the gasoline stream to form a blend; d) monitoring the volatility of the gasoline stream and the butane stream; e) monitoring the rate at which the butane stream is blended with the gasoline stream; f) inputting the monitored volatilities and monitored blend rate to an information processing unit; and g) generating a report that tabulates the monitored volatilities and monitored blend rate, or a summary thereof. view more

The method of claim 23 wherein the report is used for complying with regulatory requirements.

The method of claim 27 wherein the processor uses the butane blend rate to control an injector that regulates the flow of butane.

The method of claim 1, further comprising: a) providing a first information processing unit (IPU) on which said calculating is performed; b) providing a second IPU which generates pulses of flow rate data; c) transmitting said flow rate data to said first IPU; and d) calculating a blend rate on said first IPU based upon said flow rate data from said second IPU. view more