FR2610388A1 - Mechanism plate for a differential level indicator - Google Patents

Abstract

The present invention resides in the combination of the following elements mounted on a mechanism plate and connected to the high pressure and the low pressure of the tank, namely: 1) 1 three-way valve: R1; 2) 1 two-way valve: R2; 3) 1 differential manometer measuring the height of the level: MD; 4) 1 manometer for monitoring static pressure M1. Each of the two valves is equipped with a straight operating lever. Since these two valves are arranged in a particular manner with respect to each other, they make it possible to isolate the measuring and monitoring system. Safety is obtained by the automatic locking of one of the valves with respect to the other as a result of the actual position of their two operating levers.

Description

 It is known that liquefied gases are stored and transported in pressure tanks and at low temperatures, it is therefore necessary to install external measuring devices to know the filling level.

 By quality, (in the event of a leak, for example), these devices, also called levels, must be able to be isolated from the assembly.

 The internal pressure of the tank can reach 40 bar, which is considerable. It is therefore important to be able to isolate the measuring device, generally a differential pressure gauge, from the reservoir.

qui est fonction de la hauteur du gaz liquéfié additionnée de la pression statique elle varie en fonction de 12 hauteur du gaz ; on l'appelle la pression dynamique
C'est la différentielle entre ces deux pressions, statique et dynamique, que l'on mesure au moyen du niveau qui est un appareil précis, solide, mais, malgré tout délicat. il importe donc de prendre des précautions particulières lors de l'installation de ce niveau, à la mise en servite ou au démontage.The measurement of the level of liquefied gas is carried out by taking the upper pressure of the tank which the gold calls pressio statice and the lower pressure

which is a function of the height of the liquefied gas plus the static pressure it varies as a function of the height of the gas; it's called dynamic pressure
It is the differential between these two pressures, static and dynamic, that we measure by means of the level which is a precise, solid device, but, despite everything delicate. it is therefore important to take special precautions during the installation of this level, when setting up the servite or when dismantling.

 The turntable in question meets these needs.

 The present invention resides in a very particular arrangement of the two taps which it composes and their location on the plate. They are offset from each other and the control levers are arranged in such a way that it is now impossible to make a false maneuver.

Description:
The following elements are arranged on a metal plate (stainless steel, in this case) 10) The level height measuring device (a differential pressure gauge: MD).

20) A valve (or tap) with titis channels: R1.

 3) A two-way valve (R2).

4) A nanometer of static pressure control: M1.

optional.

 The 2 valves are arranged relative to each other as follows a) lateral offset of 22 mm.

 D) vertical offset of 15 mm. (for the models considered) on the plan, they bear the n 1 and 2.

Operating principle fiSufle ~ i ~
The 2 valve control levers are in the horizontal positive.

The elements arranged on the plate are isolated.

One can intervene, or even dismantle to change them, the measuring devices (differential pressure gauge and pressure gauge), without risk of leakage.

The R2 controller is below the R1 controller, it is not possible to move Pi without having previously moved
R2. Error is therefore impossible.

figure 2
The lever R1 remains horizontal, R2 vertical, this corrects the equipping or zero control. All the pressure arrivals are confused: it is the balance.

That is to say P-: P- '= P +'
It allows zero adjustment on the differential pressure gauge.

figure 3:
The 2 levers Pi and R2 are both vertical, the two phases, static and dynamic, are isolated from each other. The differential pressure gauge operates normally, it indicates the height of the level of the liquefied gas in the tank by the pressure difference between the upper part (static pressure) and the lower part (dynamic pressure) of the liquid.

Claims (1)

CLAIM  Device to prevent leakage of liquefied gas (or accidental hammering) in the tanks when a system for measuring, or regulating, the level of the fluid is put into service.  This device is characterized in that the control levers of two valves (one with 3 ways, the other with 2 ways by their position relative to each other, block the passage of fluid (liquid or gas) when any intervention is necessary on the measurement (or regulation) system.