SU1737275A2 - Method of determination of volume of vessel - Google Patents

Abstract

The invention relates to measurements and can be used while monitoring the volumes and tightness of vessels. The purpose of the invention is to expand the functionality of the measurement method. To determine the volume of the vessel, by moving the gas from the reference and measured vessels from one pressure level to another, the pressure change time from the initial to the final levels, chosen the same in the reference and measured vessels and equidistant from ambient pressure, and the volume is determined from a known relationship. In this method, the time of pressure change in the reference and measured vessels from the initial pressure to the ambient pressure is additionally determined and the leakage value is calculated. The method reduces the laboriousness of the tests by combining the operations of determining the volume and leakage. s § (L

Description

The invention relates to measurements and can be used while monitoring the volumes and tightness of vessels.

Known methods of control volumes (see, for example, ed. St. USSR № 1136021, CL. G 01 F 17/00).

A disadvantage of such methods is the determination of volume by separate loading and pressure release.

A known method of controlling volumes, eliminating the effect of leaks

for the result, measurement (see USSR, USSR, according to application number 670127 of 01/31/89)

However, according to this cnocoUy it is impossible to obtain information about the magnitude of the leakage.

The purpose of the invention is to expand the technological capabilities of the method by combining the measurement of the volume and leakage of the vessel and reducing the complexity of the tests.

The goal is achieved by the fact that in the method of determining the volume of a vessel by removing gas from the reference and measured vessels from one pressure level to another through equal resistance values ensuring

CO 5

to

1 recounted

i yu

17

The elapsed time measurement mode of the pressure change from the initial to the final level, selected to be the same in the reference and measured vessels and equal to the ambient pressure, determine the volume by the known dependence, additionally determine the time for the change in the reference and measured vessels. from initial to ambient pressure and calculate the amount of leakage.

Distinguishes proposed solution from

five

3. In a reference vessel, a pressure greater than 1060 mm Hg is created. by 10-15%, that is 1200 mm Hg. Stand for 10 minutes to stabilize the temperature.

4. Organize the removal of gas in a critical flow regime, for example, using a vacuum pump.

5. The time taken to remove the gas from the reference vessel from the YubO pressure mm Hg is measured. to atmospheric pressure and from pressure

1060 mm Hg to 460 mm Hg from to

The prototype is that, additionally, by means of a stopwatch or another, the time of pressure change in the reference and measured vessels from the initial pressure to the ambient pressure is measured and the leakage value is calculated.

This distinctive feature is essential when combining operations to control the volume and magnitude of leakage, which suggests that the proposed method compared with the prototype (ed. St. USSR according to application No. 4670127, dated January 31, 1989) is a novelty.

Among the known solutions with distinguished distinctive ghosts were not found. Therefore, the authors believe that the proposed invention meets the criterion of significant differences.

A positive effect in the implementation of the method is due to the fact that, with a single pressure change in the vessel, both the volume value and the leakage value are determined, which significantly reduces the labor intensity of the tests.

The method is carried out as follows.

1. Determine ambient pressure, e.g. atmospheric pressure. Let it be equal to 760 mm Hg.

2. Establish a pressure interval in which the rest time of the gas removal through the cross section is measured, providing a critical flow rate so that the differential pressure values are higher and lower than the ambient pressure, for example, YubO mm Hg. the pressure in the vessel during gas removal when the stopwatch is turned on, 460 mm Hg. - pressure in the vessel

, in the process of removing the gas when you turn off the stopwatch or another time counter.

20

thirty

35

40

4S

50

variable device.

6. Repeat steps 3–5 for the vessel and the vessel to be measured using the same resistance for the reference vessel and with the same predetermined conditions.

7. Determine the volume of the vessel according to the formula

25

H5W ST

Ји ЈМ

at

where V3T is the volume of the reference vessel;

time of gas removal from a measurable vessel at a critical flow rate from YubO to 460 mm Hg; the time of gas removal from the standard vessel at a critical flow rate from 10 to 460 mm Hg.

8. Determine the magnitude of the leakage capacity according to the formula

CSLG

QtQue

ft-UIZM. hGr p) „

Vt3T.Qv, T tM3M.QMFH FQ

t, t L3T, a meas.

where ct .. at the time of pressure change from 106t) mm to atmospheric, respectively, in the reference and measured vessels; RN-YubO mm Hg - pressure

in the vessel with the inclusion of a sec domera;

Pq - atmospheric pressure. Using the proposed method allows simultaneous monitoring of the volumes and measuring the leakage of the vessel.

Claims (1)

55 claims The method of determining the volume of the vessel by ed. St. N 1654663, about tl and h variable device. 6. Repeat steps 3-5 for the vessel being measured using the same resistance for the reference vessel and with the same predetermined conditions. 7. Determine the volume of the vessel according to the formula H5W ST Ји ЈМ at 0 five where V3T is the volume of the reference vessel; the time of gas removal from the vessel being measured at a critical flow rate from YubO to 460 mm Hg; the time of gas removal from the reference vessel under the critical flow regime from YubO to 460 mm Hg. 8. Determine the magnitude of the leakage capacity according to the formula CSLG CT Que ft-UIZM. hGr p) „ Vt3T.Qv, T tM3M.QMFH FQ t, t L3T, a meas. where qt. at the time of a pressure change from 106t) mm to atmospheric, respectively, in the reference and measured vessels; RN-YubO mm Hg - pressure in the vessel when the stopwatch is turned on; Pq - atmospheric pressure. Using the proposed method allows simultaneous monitoring of the volumes and measuring the leakage of the vessel. 55 claims The method of determining the volume of the vessel by ed. St. N 1654663, about t of l and h a51737275 " y u u and with the fact that, with the aim of ras-yuYuims ia1. (t R h widening the functionality of t, and by determining the leakage vessel, the time is measured additionally where .h and tH.4 during the pressure change of the pressure change in the reference sludge from initial Pu to measured vessels from the initial environmental pressure Pq ambient pressures, and the magnitude of the reference and measured leakage sleep is calculated by the ships, respectively; formula volume of vessel to be measured;  - the volume of the reference vessel.