Ultrasonic flowmeter Rapira-PV


Rapira-PV

Intended use
Measuring volumetric flow and volume of fluids in reservoir pressure maintenance systems (RPMS).
The device is manufactured in 36 designs different in their nominal diameter, explosion safety, output signal types, and in that they are supplied with or without flanges. In order to select and order a required design of the Rapira-PV flow meter, please fill out the Questionnaire.

Fluid:
Any non-aggressive toward steel grade 12Х18Н10Т.
  • Max. fluid pressure*.............................. 20 MPa;
  • Concentration of solid particles, max....... 20 g/L;
  • Salt load, max...................................... 20 g/L;
  • Fluid temperature range...................... 0…+80°С.
*- for custom-made devices max. fluid pressure above is selected from values specified in GOST 356-80 (up to 40 MPa).

Flow meter components:
A fireproof flow meter comprises a primary transducer unit (PTU) measuring volumetric flow, and a flow recording unit (FRU) for intrinsically safe PTU power supply and measurement result storage (a common-design flow meters consists of a PTU only).

The main PTU component is a measure chamber (MC) featuring a cylinder of a specific diameter. Two electroacoustic transducers (EAT) are installed in the centerline plane at an angle to the centerline and connected to the electronic unit (EU) for control of the same or output of measurement result data to external devices. Also, a PTU is equipped with a temperature transmitter (TT).

A FRU is manufactured as a stand-alone unit. A PTU and FRU are connected with a 4-wire communication line up to 250m in length.

Operating principle:
The flow meter implements a time-pulse method of volumetric flow measurement. During operation a fluid flow is alternately sound by acoustic signals. The PTU electronic unit measures the transit time and difference of acoustic pulses propagating in and against flow direction. A fluid flow rate is determined based on the above times. Such flow rate is converted to a volumetric flow. Incorporation of a controlled fluid temperature results in improved volumetric flow measurement accuracy.

The EAT and volumetric flow meter design is patented in RU and other countries.

Rapira-PV flow meter technical data



Item

Description

Value

Note

1.

Nominal diameter, DN, mm

50, 65, 80, 100, 150, 200

 

2.

Volumetric flows measurement range, m3/h

 

(Dynamic range min. 1:150)

0,7…100

for DN=50 mm

3.

1,0…150

for DN=65 mm

4.

1,3… 200

for DN=80 mm

5.

2…300

for DN=100 mm

6.

4,5…675

for DN=150 mm

7.

8…1200

for DN=200 mm

8.

Relative error for the whole temperature range, %, max.

1,5

             For flow range from 0.025 Gmax to Gmax

9.

2,0

        For flow range from 0.0067 Gmax to 0.025 Gmax

10.

Pipeline connection

flange-free or flanged

on request

11.

PTU housing length, mm

120

for DN=50 mm

12.

140

for DN=65 mm

13.

140

for DN=80 and 100 mm

14.

180

for DN=150 mm

15.

 

200

for DN=200 mm

16.

Distance to pump

20 DN

 

17.

Lay length, max.

10 DN upstream

and 3 DN downstream

 
18. Max. fluid pressure, MPa 20 For custom-made devices max. fluid pressure above 20 MPa is selected from values specified in GOST 356-80 (up to 40 MPa)
19. Fluid temperature 0° to +80°С  
20. Absolute permissible temperature change error limit, %, max.

±5

  

21.

Ambient temperature

-40° to +70°С

PTU, group C2 to GOST R 52931

22.

-40° to +70°С

FRU, extended temperature range, group C2 to GOST R 52931

23.

PTU operating modes

1. PTU programming

2. Operation

 

24.

Output

RS-485, скорость передачи 19200 бод

ModbusRTU protocol

Pulse output

The pulse value is programmable in the range between 0.1...1000 L/pls.

25.

Archive storage

up to 64 days

Hourly recording

26.

FRU operating modes

1  . FRU programming

2. Operation

 

27.

Indication modes

1. Current flow rate, m3/sec.

The least significant bit value is 10-7 m3/sec.,        max value 12 m3/sec.

2. Current flow rate, m3/h

 

The least significant bit value is 10-3 m3/h,             max value 99999 m3/h

3. Direct volume, m3

The least significant bit value is 10-3 m3,                max value 4*109 m3

4. Return volume, m3

The least significant bit value is 10-3 m3,                max value 4*109 m3

5. Total volume, m3

The least significant bit value is 10-3 m3,                max value 4*109 m3

6. Flow meter performance total time

days: hours: min

 

7. System status message

6 types

28.

Information updating rate

 1Hz

 

29.

PTU explosion-proofness

1ExibIIBT5

Combines with FRU

30.

FRU explosion-proofness

[Exib]IIB

 

31.

PTU enclosure protection degree

IP67

 

32.

FRU enclosure protection degree

IP65

 

33.

PTU resistance to sinusoidal vibration

group L1 to GOST R 52931

Frequency 5 to 35Hz, max displacement 0.35mm

34.

FRU resistance to sinusoidal vibration

group L3 to GOST R 52931

Frequency 5 to 25Hz, max displacement 0.1mm

35.

PTU electrical safety

Class III

GOST 12.2.007.0

36.

FRU electrical safety

Class I

37.

Communication cable length, m, max.

250 

 

38.

Calibration interval, years, min.

4

 

39.

Mean life, ТО, hours, min.

100 000

 

40.

Total mean life, years, min.

9

 

41.

Consumed power, W, max.

2

non-explosion-proof design

42.

12

explosion-proof design

43.

Non-explosion-proof design supply

15…27 V

 

44.

Explosion-proof design supply

220V ±10%, 50Hz

 

45.

SPTA set

Fuse, 2 off

0216.100 Р

46.

PTU weight, kg, max.

10,5

for DN=50 mm

47.

13,7

for DN=65 mm

48.

13

for DN=80 mm

49.

16,3

for DN=100 mm

50.

33

for DN=150 mm

51.

52

for DN=200 mm

52.

FRU weight, kg, max.

2,5

for all DN


Rapira-PV flow meter special features:
  1. Larger flow dynamic range (1:150).
  2. Full-bore measuring chamber, no moving parts and pressure loss.
  3. Improved resistance to suspended particles and gaseous impurities.
  4. Calculation of flow is performed taking into account ambient temperature (equipped with a temperature transmitter).
  5. Original piezotransformer design ensures its reliability under controlled fluid high-pressure conditions.
  6. Low dispersion and dynamic error of a measured flow (due to a large number of processed sounding signals per unit of time).
  7. Application of explosion protection such as an intrinsically safe circuit (not an enclosure like with similar devices).
  8. High noise resistance due to application of low impedance differential circuits, and electrical unit galvanic isolation from the pipeline.
  9. Buildup on the measuring chamber walls has little or no effect pm measurement precision.
  10. Overall and connection dimensions of the RAPIRA-PV flow meter ensure full replaceability by other flowmeters (DN50 and DN100) applied in RPM systems nowadays.
  11. Flow meter readings may be stored in the archive for 2 months (64 days) with hourly recording.
  12. The calibration interval is 4 years.