SU1315814A1 - Piezometric method of measuring liquid level in hermetically-sealed tanks - Google Patents

Abstract

The invention of off-line for ZorostroSnigo can be used. 3 different fields npciMbinnenHocTH ir co. i, hgch (. He. M UiOpe- shade - ponippe 1 ie precision yp-Ui i, When zappelit Miiiii:, the fluid is tight; e bone; with C gp5e: o; eetric : 1 but 1 ruzhan) t ii n abs; 1yut1-th value; anleni starts rHie 5 i iiaTi. absolute gas rate, HiV; action difference; dan11 zh ddchost comes i; li CKHN has a gas in it up to; - the value of the pump pressure measured by the sensor 3. The level of the liquid in the tank.

Description

Fiyo.G

The invention is relative (x; it is to the device for digging and can be used: bushes.; Various OTpacjiBX industry and agriculture,

The aim of the invention is to determine the accuracy of the level measurement

FIG. 1 shows a device for carrying out the method with measuring the pressure difference n gp, an izometric tube and a liquid above the mirror; - tee and absolute datum over the mirror of acuity; Fig. 2-- is a device for carrying out the method with measurement of absolute pressure and a piech tube and above a liquid mirror;

When pressurizing the fluid-tight tank (Figures 1 and 2), the end of the piezometric tube 1 is immersed in the fluid and the absolute pressure P, at its orifice it begins to exceed the absolute pressure of the gas P. tank and tube 1 when tube 1 reaches the opening. Under the action of the pressure difference P - P, the liquid enters tube 1 and compresses the gas in it to an absolute equal value

lute pressure P

yb

where P is the fluid tightness of the fluid;

g is the acceleration of free fall; h - setting a s b (the cell of the liquid column and in the tube 1. The neglected temperature of the gas measurements in the tube t will be recorded:

P, V, P, V,, (: L

where V and V are the volume 151 of gas in tube 1, respectively, at pressures I, II 1. but

(3)

where d is the diameter-p corpse-1si 1,

Solving equation (1) y. (.3) jointly and excluding h, noluchach; -g

o1 - yes

/ V

g,

I

e 1

T- F: j Y

five

-t to

F.)

five

Ursven, fluid in the tank above the hole of the piezometric tube; Р - absolute pressure of gas; h

capacity. Substituted (5) in (4), toluchamt

(P, -R,) 1 R. -R,,

- - - - Q, 1

The device (Fig. 1) consists of a zometric tube 1, sensors i and 3 absolute pressure, tube 4 and calculate 1 foot (5 cuce 5; In it, pressure P is measured by the absolute pressure gauge 2,}, - with absolute pressure sensor 3 and;

- sensor

3 at time P ,, - P, S and the liquid level

-15

Substituting P - P | . noJivqanr

 2 I 3f

H i tifliPil.- 1 p-r. And

R; pp

J

The device (Fig ,, 2) consists of 5Q piezometric tube 6, l, at-line 7 differential pressure, absolute pressure sensor 8, tube 9 and computed block 1C, It has:. datas; om 7 parnroc7-i-: dat55

- datas about 8 abcoJrut and

pressure; P - sensor 3G;) pressure in Pg - (1

3

Ф орм ул а and 3 о б р е e and u

A piezometric method of measuring the level of a liquid in hermetic containers, which consists in measuring the current gas pressure in an EZ piezometric tube and in the gas cavity of a vessel and then calculating the level, so that, with the aim of increasing - accuracy, additionally, the gas pressure above the liquid surface is measured at the moment of isolating the sheath of the cavity of the piezometric tube with the controlled liquid, and the level is calculated by the formula

(p, p) 1 Pr-p;

N.

pg

the liquid level in the tank is above the piezometric pressure gauge;

pressure of gas in gas, at the moment of its isolation from the gas cavity of the vessel with a controlled fluid;

the current gas pressure in the vessel;

the current gas pressure in the pipe, eometry 1 tube; piezometric tube length;

fluid density; free fall acceleration.

fia z

Compiled by V. Kurochkin Editor 0. Yurkovetskaya Tekhred M. Khodich Corrector M, Demchik

Order 23D6 / AZTirage 693Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Production and printing company, Uzhgorod, st. Design, /

Claims (1)

Formula and sampling where I is the liquid level in the tank Piezometrically: 'a method of measuring the liquid level in sealed containers, which consists in measuring the current gas pressure without a piezometric tube and in the gas cavity of the vessel and then calculating the level, which is tinned by the fact that, with a chain of increasing accuracy, additionally iO measure pressure gas above the surface of the liquid at the time of isolation of the cavity of the piezometric tube with a controlled liquid, and the level is calculated by the formula for 15 _n _ (Pr-P-) 1. & _Ζ_Ρί ⁿ 'P ~ “pg' above the hole of the piezometric tube; P ₍ is the gas pressure in the piezometric tube at the time of its isolation in the gas cavity of the vessel is controlled)! fluid; P ₍ is the current gas pressure in the vessel; P is the current gas pressure in pye. Eometric handset 1 — length of the piezometric tube; 5 p — fluid density; g is the acceleration of gravity. FIG. 2