Abstract Corrector equipment for converting gas flow rate measurements into heat flow measurements in a fuel gas distribution network using gas or gas mixture having variable characteristics and including a plurality of user stations branched on the general piping of said network, each of said stations including a gas admission valve, a diaphragm inserted upflow of said valve and a differential pressure gauge connected with said diaphragm. The equipment comprises a calorimetric oven gas-supplied from said network through a pipe, a regulator valve inserted on said pipe and controlled by a regulator system so as to keep the heat flow in said oven at a constant value, a further diaphragm inserted on said pipe and a further differential pressure gauge connected with said further diaphragm, said further pressure gauge delivering a signal Delta P'', means for keeping the temperature and pressure of the gas supplied at any instant to all of said diaphragms at common constant values, and calculation means for deriving from said signal and from the flow rates Delta P1, Delta P2, . . . measured by said differential pressure gauges in each one of said stations quantities proportional to square root Delta P1/ Delta P'' , square root Delta P2/ Delta P'' , . . . and representing respectively the actual heat flow rates in each one of said stations.
In a piped fuel gas distribution network using gas or gas mixture having variable characteristics and including a plurality of user staions coupled through individual station pipes to the piping of said network, each of said stations receiving gas from the common distribution network in the same instantaneous pressure and temperature conditions, said stations each including a respective gas admission valve in said individual station pipe, a diaphragm inserted in said station pipe upflow of said valve and a differential pressure gauge connected with said diaphragm for producing individual differential pressure signals, a calorimetric oven gas-supplied from said network through an oven pipe, a regulator valve inserted in said oven pipe and responsive to temperature differences within said calorimetric oven to keep the heated flow in said oven at a constant value, a further diaphragm inserted in said oven pipe upflow of said regulator valve, and a further differential pressure gauge connected with said further diaphragm, said further pressure gauge delivering an oven pipe differential pressure signal, and ratio and square root circuit means for deriving from said oven pipe differential pressure signal and from the individual differential pressure signals measured by said differential pressure gauges in each one of said station pipes quantities that are proportional to the square root of the ratio of each station''s differential pressure signal to said oven pipe differential signal that reflect the actual heat flow rates in each one of said stations, and means for representing respectively said actual heat flow rates in each one of said stations.
Claim 2
Dependent Claim
255 words
In a piped fuel gas distribution network using gas or gas mixture having variable characteristics and including a plurality of user staions coupled through individual station pipes to the piping of said network, each of said stations receiving gas from the common distribution network in the same instantaneous pressure and temperature conditions, said stations each including a respective gas admission valve in said individual station pipe, a diaphragm inserted in said station pipe upflow of said valve and a differential pressure gauge connected with said diaphragm for producing individual differential pressure signals, a calorimetric oven gas-supplied from said network through an oven pipe, a regulator valve inserted in said oven pipe and responsive to temperature differences within said calorimetric oven to keep the heated flow in said oven at a constant value, a further diaphragm inserted in said oven pipe upflow of said regulator valve, and a further differential pressure gauge connected with said further diaphragm, said further pressure gauge delivering an oven pipe differential pressure signal, and ratio and square root circuit means for deriving from said oven pipe differential pressure signal and from the individual differential pressure signals measured by said differential pressure gauges in each one of said station pipes quantities that are proportional to the square root of the ratio of each station''s differential pressure signal to said oven pipe differential signal that reflect the actual heat flow rates in each one of said stations, and means for representing respectively said actual heat flow rates in each one of said stations.