Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1992-03-11
1994-02-08
Raevis, Robert
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
G01F 2500
Patent
active
052840468
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a calibrating apparatus for control of volume meters, especially volume meters for delivering highly inflammable liquids, f. inst. volume meters in the form of propellant pumps in the traffic sector, which calibrating apparatus has at least one standard designed with a determined volume and provided with a filling opening and a discharge opening connected to a reception tank, and in which the standard and the reception tank are placed on a frame provided with wheels, especially a trailer.
BACKGROUND OF THE INVENTION
A society is, both for judicial and fiscal reasons, interested in safeguarding that a citizen while filling propellants into a motor vehicle may receive the correct amount in accordance with the desired or ordered amount.
Earlier types of propellant pumps have been known in which the propellant was pumped by hand from a subterranean storage tank into one or more measuring glasses which each might have contained f. inst. five liters, whereafter the propellant was poured via an adjustable valve through a hose and a filling nozzle down into the tank of the vehicle. It was hereby possible for the citizen or for an inspector appointed for the task to control the correct amount of propellant, as the measuring glass was provided with indicating marks so that the volume might easily be controlled.
However, these types of propellant pumps were slow in operation and the manual pumping demanded a great deal of working power, and the applicability of the propellant pumps therefore declined concurrently with the rising employment of motor vehicles.
Modern propellant pumps therefore are motor driven and are provided with pumps and measuring means which show the amount of propellant delivered.
However, measuring means of this kind may change in accuracy, f. inst. because of wear or impurities, and a citizen normally has no possibility of controlling the amount of propellant delivered, as this is pumped directly into the tank of the vehicle. The possibility available to a citizen to control the amount of propellant delivered would be for he or she to bring along a volume calibrated container, a so called standard, which would be filled up to a certain graduation mark, whereafter the contents of the container would be poured into the tank, f. inst. by lifting the container and pouring the contents through a funnel and a hose.
Considering that a modern private vehicle has a tank of a volume of 40 liters or more, and that a lorry often may have a tank of several hundred liters, such a control would be Utopian to accomplish for the ordinary citizen because the propellant pump would be blocked for a considerable period.
On the other hand this kind of control has been available for an authorized control of petrol pumps, but it cannot live up to the latest requirements on efficiency, environmental care and fire resistance.
It should be remembered that in the authorized control the measured amount of propellant is not bought, so that the propellant collected in the standard is still the property of the owner of the tank, and that the amount of propellant contained in the standard has to be returned to the storage tank of the petrol station through a filling pipe which for reasons of fire prevention is situated at a considerable distance from the propellant pump. The storage tank is normally for the same reasons situated underground and tank stations are provided with several propellant pumps which all have to be controlled.
To achieve the necessary guarantee of a correct verification or calibration of the individual liquid meter in the propellant pump the control of the liquid pump has to be effected by means of several consecutive fillings and emptyings of the standards.
Furthermore the propellant pumps deliver petrol in an amount of typically 60 liters per minute through filling nozzles which are provided with means for automatical stopping of the pumping if a tank is filled or the propellant during the filling "kicks back", and the calibration of the measuring mea
REFERENCES:
patent: 1855502 (1932-04-01), Weymouth
patent: 2050800 (1936-08-01), Lane et al.
patent: 3605481 (1971-09-01), Basler
patent: 4106328 (1978-08-01), Neeff
patent: 4928514 (1990-05-01), Beaston
Blichfeldt Henrik
Engmann Michael
Jensen Erik
Kjeldgaard Jorgen H.
Lundh Flemming
Dantest, Dansk Institut For Proevning OG Justering
Raevis Robert
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