Irga-RV vortex flowmeter

Description

The Irga-RV vortex flow meter (hereinafter referred to as the flow meter) is designed for measuring the flow of gases, saturated and superheated steam, and liquids (including aggressive and cryogenic media).

At the Customer's request, supply of vortex flow meters can be customized for a specific medium.

The flow meter is intended for both stand-alone use and for use as part of meters, metering units and measuring complexes.

Together with the Irga-2 computer, SPT963 heat meter (manufactured by ZAO NPF LOGIKA) (or other similar computers), the flow meter measures the volume and flow rate of the medium under operating conditions; the flow rate and amount of gas set to standard conditions (760 mmHg and 20 °C); flow rate and amount of liquid and other parameters of the carrier.

Technical characteristics

Main technical and metrological characteristics

Q_min/Q_max flow measurement ranges	steam, gas:* 1.5-80,000 (minimum 1:40) liquid: 0.16-1,400 (minimum 1:80)
Note * The higher gas density, the lower limit of measurement.
Standard size, DN	straight-way version: 20-800 mm submersible version: 400-3,000 mm
Overpressure	up to 40 MPa (400 atm)
Medium temperature	- 196 to + 460 °C
Ambient temperature	- 55 to + 80 °C
Limit of the main relative error of flow measurement	0.5 % ; 1.0 %
Environmental protection	Irga-RVP and VR-100: IP65 Irga-RP: IP54
Explosion protection	BP-100 electronic unit - 0Exia [ia] IIСТ5 The Irga-BP power supply unit with the ia intrinsically safe input circuits - [Exia] IIС X Accessories (if any) - 0ExiaIICT5 X or 0ExiaIICT6 X

Ranges of measured air flow rates
with the overpressure not exceeding 20 kPa and a temperature of (20±1) °С
(straight-way version)

Nominal diameter, DN, mm^[1]	Operating consumption, m³/h
Nominal diameter, DN, mm^[1]	minimum (ver. Т80, Т200, Т280, Т350)^[2]	minimum (ver. Т460)^[2]	maximum^[3]
20, 25^[4]	1.5	4.5	30.0
20, 25^[4]	2.0	6.0	70.0
20, 25^[4]	2.5	7.5	100.0
32.0	4.0	12.0	160.0
40.0	6.0	18.0	240.0
50.0	10.0	30.0	400.0
80.0	20.0	60.0	1,000.0
100.0	30.0	100.0	1,500.0
150.0	100.0	250.0	4,000.0
200.0	200.0	350.0	9,000.0
250.0	250.0	750.0	12,000.0
300.0	350.0	1,500.0	16,000.0
400.0^[5]	640.0	2,500,0	30,000.0
500.0^[5]	1,000.0	3,000.0	80,000.0
700.0^[5]	1,900.0	5,700.0	80,000.0
800.0^[5]	2,100.0	6,300.0	80,000.0

Notes
^[1] For DNs equal to 100, 150, 250, 300, 400, 500, 700, and 800 mm, the gas-path part diameters are 98, 148, 257, 310, 406, 510, 698, and 796 mm, respectively; in other cases, DN and gas-path part diameter match.
^[2] The performance of the flow meters according to the range of the measured medium operating temperatures is given in Clause 1.3.9 of the Operation Manual: straight-way version
^[3] The upper limit of measurement under operating conditions, if necessary, can be changed in agreement with the manufacturer.
^[4] There are three versions for DN20 and DN25.
^[5] Sizes are customized.

Ranges of measured air flow rates at overpressure not exceeding 20 kPa (submersible version)

Nominal diameter DN, mm	Operating consumption, m³/h
Nominal diameter DN, mm	minimum	maximum *
400	640	25 000
500	1 000	35 000
600	1 500	55 000
700	1 900	75 000
800	2 100	100 000
900	3 500	120 000
1 000	4 000	150 000
1 200	6 000	200 000
1 400	8 000	300 000
1 500	9 000	350 000
1 600	10 000	400 000
1 800	13 000	500 000
2 000 **	16 000	600 000
3 000 **	36 000	800 000

Note
* The upper limit of measurement under operating conditions may change if necessary. It is permissible to exceed the maximum flow rate specified in the log for the flow meter by no more than 10%.
** For flow meters with a DN above 2,000 mm, the upper limit of the flow measurement is selected at the customer's request, agreed with the manufacturer of the flow meters and is entered in the flow meter log.

The ranges of the measured flow rates of liquid media
with a density of 1,000 kg/m³ and a viscosity of 1 cSt (density and viscosity of water), at t = 20 °C
(straight-way version)

Nominal diameter DN, mm*	Operating consumption, m³⁄h
Nominal diameter DN, mm*	minimum	maximum*
20, 25**	0,100	10
20, 25**	0,160	12
32	0,250	20
40	0,300	24
50	0,625	50
80	1,250	100
100	1,875	150
150	6,250	500
200	12,500	1 000
250	15,625	1 250
300	20,000	1 400

Note
* The upper limit of measurement under operating conditions, if necessary, can be changed in agreement with the manufacturer.
** There are two versions for DN20 and DN25

Measured flow ranges for liquids with a viscosity of 1 cSt (water viscosity)
(submersible version)

Nominal diameter, DN, mm	Operating consumption, m³⁄h
Nominal diameter, DN, mm	minimum	maximum
400	40	3 000
500	65	4 800
600	90	7 000
700	120	9 000
800	160	12 500
900	200	15 000
1 000	250	18 000
1 200	360	28 000
1 400	480	35 000
1 500	550	42 000
1 600	650	50 000
1 800	800	60 000
2 000 *	1 000	75 000
3 000 *	1 500	100 000

Note
* For flow meters with a DN greater than 2,000 mm, the upper limit of the flow measurement is customized, agreed with the manufacturer of the flow meters and entered in the log of the flow meter.

Principle of operation

The vortex flow meter uses periodic generation and vortex breakdown formed on the edges of the vortal body when a gas or steam flows around it. Behind this body, a regular vortex path forms, which is called the Karman vortex street by the name of its researcher.

дорожка Кармана2.jpg

The frequency of vortex breakdown depends on the geometrical dimensions of the vortal body, the diameter of the pipeline, and the flow velocity and is directly proportional to the flow rate of the medium being measured.

Karman vortex street for each specific vortex flow meter is an ordered structure, where vortices are separated at a strictly defined distance, independent of the flow velocity. The frequency of vortex breakdown, which in a certain range is proportional to the flow rate, depends on the flow velocity.

A vortal body in the form of a prism is mounted in the flowing part of the vortex flow meter perpendicular to the flow. Behind it, downflow, there is a piezoelectric transducer that converts pressure pulsations caused by vortex generation into an electrical signal. This signal is converted, amplified and carries information about the volumetric flow rate to the computer.

Versions

Flow meter versions

New version of flow meter

Since 2018, Globus LLC launched production of new flow meters, flow sensors (ultrasonic Irga-RU and vortex Irga-RV).

Equipped with pressure and temperature sensors, the flow meter provides real-time conversion of the flow rate of the measured medium:

for steam - in tons per hour (t/h) or kilograms per hour (kg/h);
for liquid (especially high-temperature) - in tons per hour (t/h) or kilograms per hour (kg/h);
for cold water - in tons per hour (t/h), kilograms per hour (kg/h); m³/h;
for gases - in m³/h, set to standard conditions, or, at the request of the customer, in tons per hour (t/h) or kilograms per hour (kg/h).

Advantages

The output signals are transmitted from the electronic unit of the flow meter.
This device has already proven itself in automated process control metering systems.
A version with an indication at the electronic unit of the flow meter or at the Irga-BP power supply has been developed.
The flow meter converts the volumetric flow rate of the measured medium into frequency (including impulse-number) or current signals, or a digital code (the specific type of output signal is indicated when ordering).
HART and 4-20 output signals are transmitted without adapters.
It is possible to transmit up to 3 signals simultaneously: frequency, current, RS-485.

The Irga-RV flow meters can be full bore or submersible.

The flow meter versions depending on the medium maximum pressure:*	The flow meter versions depending on the medium maximum temperature:	The flow meter versions depending on the output signal:
up to 1,6 MPa up to 2,5 MPa up to 4,0 MPa up to 6,3 MPa up to 10,0 MPa up to 16,0 MPa up to 20,0 MPa up to 25,0 MPa up to 32,0 MPa up to 40,0 MPa	T80/-30 : - 30 to + 80°С T80/-55 : - 55 to + 80 °С T150/-30 : - 30 to + 150 °С T150/-55 : - 55 to + 150 °С T280/-30 : - 30 to + 280 °С T280/-55 : - 55 to + 280 °С T300/-30 : - 30 to + 300 °С T300/-55 : - 55 to + 300 °С T300/-30 : - 30 to + 350 °С T350/-55 : - 55 to + 350 °С T460/-30 : - 30 to + 460 °С T460/-55 : - 55 to + 460 °С	F1100 – frequency, 100 to 1,100 Hz F1000 – frequency, 0 to 1,000 Hz F0 – impulse-number I20 – unified current 4 to 20 mA I5 – unified current 0 to 5 mA HL – digital, (output of measured parameters to an external digital controller or computer) HART – HART output
Note * The pressure value during durability tests is taken in accordance with GOST 356. The maximum working pressure at an ambient temperature above 200 °C is taken in accordance with GOST 356.
Versions of flow meters depending on the limit of the main relative error
y1 — ±1 % y0,5 — ±0,5 % (air or another gas; carrier pressure is not more than 1.6 MPa)
The Irga-RV full-bore flow meter have following Irga-RVP case versions
F - flange FR - threaded flanges in accordance with GOST 9399 and lens seal BF - without flange BF (NK) - without flange, with weld rings R - threaded connection in accordance with GOST 16078 S - connection for welding

Irga-RVP case is tight at the maximum working pressure of the measured environment.

The design of the flow meters ensures no leaks and emissions of the carrier into the environment.

Advantages

Advantages of the Irga-RV vortex flow meter

Irga-RV vortex flow meter allows production of meters for measuring the flow rates of almost any gaseous and liquid media

Independence of metrological characteristics from pollution (heavy hydrocarbons, solid particles in the gas stream - scale, sand, etc.):

autopurification of the vortal body working edges and surfaces is possible

The flow meters withstand (parameters of the medium being measured):

pressure up to 400 atm (tests up to 1,000 atm were carried out, in fact there are no restrictions on the upper pressure limit)
temperature from -196 °C to +600 °C

A wide range of measurements of the volumetric flow rate of the carrier (for gas, with increasing density, the lower measurement limit expands):

gas, steam: minimum 1:40
liquid: minimum 1:80

Resistance to pneumatic and hydroshocks, to acoustic noise of a sound and ultrasonic range

Immunity to the liquid phase in a gas

No moving parts

The Irga-RV flow meter can provide any output signal that allows integration of them into almost any working metering system for gas, steam, liquid, and thermal energy

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Medium

Gas:
- natural gas;
- APG;
- coke-oven gas;
- technical gases (air, oxygen, hydrogen, nitrogen, argon, etc.);
- food gas mixtures (biogon, etc.);
- cryogenic gases
- etc.
Saturated or superheated steam
Liquids:
- water;
- petrochemicals;
- aggressive and cryogenic liquids (liquid hydrogen, oxygen, nitrogen, etc.);
- solutions;
- suspensions, emulsions and melts of substances, including produced water
- etc.
Heat energy and heat carrier (in heat supply systems with steam heat carrier)

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