一、Overview

Our intelligent differential pressure flowmeter includes orifice flowmeter and wedge flowmeter, which can be used for gas measurement and liquid measurement. Those are designed, installed and used in accordance with 1S05167 international standard and (or) GB/T2624 national standard, which are called standard throttling devices, and others are called non-standard throttling devices. The amount of standard throttling device is more than that of the latter, while the structure, variety, caliber and applicable medium conditions of non-standard throttling device are far more than that of the former.

 

二、Orifice flowmeter

1、Operating Principle

When the fluid filled in the pipeline flows through the throttling device in the pipeline, the flow will form local contraction at the throttling part to increase the flow rate, and the static pressure will be reduced to, so the static pressure difference will be generated before and after the throttling part. The greater the flow rate of the fluid, the greater the differential pressure value before and after the throttling part, so the flow rate of the fluid flowing through the throttling device can be measured by measuring the differential pressure. This measurement is based on the law of conservation of energy and the continuity equation of the flow.

The relationship between flow rate and differential pressure is determined by the following formula:

q_m=C/(1-β⁴)^0.5×ξ×π/4×d²( 2△Pρ₁)^0.5

q_v= q_m/ρ₁

q_m：Mass flow rate            kg/s

q_v：Volumetric flow rate          m³/s

C：Flow coefficient             dimensionless

ξ：Expansion factor                  dimensionless

d ：Diameter of the orifice in the throttling device            m

△P：Differential pressure                  Pa

ρ₁：Fluid density             kg/ m³

 

 

Schematic diagram of orifice plate measurement principle

 

Orifice flowmeter

 

2、Applicable Range

   It can be widely used in petroleum, chemical industry, natural gas, metallurgy, electric power, pharmaceutical and other industries to continuously measure the volume flow or mass flow of various liquids, gases, natural gas and steam.

3、Technical parameters, specifications and models

型号	BK-50/63-F	BK-80/63-F	BK-100/63-F	BK-150/63-F
承载压力	2.5MPa、4.0MPa、6.3MPa、10MPa、16MPa、25MPa
安装方式	法兰连接
接线标志	两线制	两线制	两线制	两线制
工作温度	-30~70℃	-30~70℃	-30~70℃	-30~70℃
信号输出	4~20mA	4~20mA	4~20mA	4~20mA
电源	10.5~55V DC	10.5~55V DC	10.5~55V DC	10.5~55V DC
测量精度	1.0级	1.0级	1.0级	1.0级

 

Model	BK-50/63-F	BK-80/63-F	BK-100/63-F	BK-150/63-F
Bearing pressure	2.5MPa、4.0MPa、6.3MPa、10MPa、16MPa、25MPa
Installation method	Flange connection
Wiring marks	Two-wire system	Two-wire system	Two-wire system	Two-wire system
Operating temperature	-30~70℃	-30~70℃	-30~70℃	-30~70℃
Signal output	4~20mA	4~20mA	4~20mA	4~20mA
Power source	10.5~55V DC	10.5~55V DC	10.5~55V DC	10.5~55V DC
Measurement accuracy	1.0Level	1.0Level	1.0Level	1.0Level

4、Product features

The product is easy to disassemble and maintain. The orifice plate flowmeter can still work normally in the field extreme environment, with the stable performance and high measurement accuracy,and with no moving parts and not easy to be worn. The orifice flowmeter has the advantages of simple structure, convenient installation and maintenance-free. The orifice plate flowmeter can be used in the desert at -40 ℃ ~ 80 ℃, and the design avoids the problem of freezing and blocking of the impulse pipe caused by low temperature.

5、Integration of orifice plate flowmeter

   This orifice plate flow meter integrates the flow computer into the head, making installation easier and maintenance more convenient. It can locally display instantaneous flow rate, cumulative flow, temperature, and pressure. At the same time, it transmits data to the monitoring system via RS-485.

 

 

Schematic Diagram of Intelligent Orifice Flowmeter

6、Product configuration

The orifice plate flow meter is generally installed downstream of the emergency shutoff device on the wellhead gas extraction tree to measure the flow data of a single well in real time. Its main configuration includes: differential pressure transmitter, pressure transmitter, temperature transmitter, LCD display head, pressure guiding tube, ball valve, pressure tapping flange, throttling device, and connecting flange.

1）Nominal diameter: DN50 、DN65 、DN80 、DN100 、DN125、DN150。

2）aperture ratio β:0.1≤β＜0.75

3）Reynolds number range:5000≤ReD And170β2 D≤ReD

       When0.56< β,16000β2 D≤ReD

4）Nominal pressure:2.5MPa、4.0MPa、6.3MPa、10.0MPa、16.0MPa、25.0MPa

5）Accuracy:1.0Level

6）Working temperature: -40 ℃ ~ 80 ℃

7) Operating voltage: 9 ~ 36 DCV

8) Protection grade: IP65

9) Explosion-proof sign:Exia IICT4

10) Output signal: RS-485

11) Communication protocol: standard Modbus RTU

12) Electrical connection: M20 * 1.5 connecting thread

13) Transmission data: standard instantaneous flow (m3/H), cumulative flow (m3), temperature (℃), pressure (MPa)

 

三、Wedge flowmeter

1、 Overview

The wedge flowmeter is used to measure the dirt entrained in gas or liquid. The dirt can be taken away from the bottom of the wedge. It is generally installed downstream of the natural gas well to measure the flow data of a single well in real time.

It is mainly equipped with multi-parameter flow calculator, differential pressure transmitter, pressure transmitter, temperature transmitter, liquid crystal display meter, ball valve, throttling parts and connecting flange. The wedge flowmeter is shown in the following figure:

 

 

图Outline Diagram of Intelligent Wedge Flowmeter

 

  1) Flow calculator: It is used to collect differential pressure, pressure and temperature signals, process the original signals and display the data locally, and upload the data through RS-485.

  2) Differential pressure transmitter: it is used to collect the differential pressure signal generated by the upstream and downstream of the orifice plate.

  3) Pressure transmitter and temperature transmitter: it is respectively used for pressure measurement and medium temperature measurement of the pipeline.

  4）Ball valve: the ball valve can be closed when maintaining and testing the flow calculator.

  5) Connecting flange: it is used to install the orifice flowmeter and connect the gas pipeline.

2、Scope of application

It can be widely used in petroleum, chemical industry, natural gas, metallurgy, electric power, pharmaceutical and other industries to continuously measure the volume flow or mass flow of various liquids, gases, natural gas and steam.

3、Operating Principle

 When the fluid filled in the pipeline flows through the throttling device in the pipeline, the flow will form local contraction at the throttling part to increase the flow rate, and the static pressure will be reduced to, so the static pressure difference will be generated before and after the throttling part. The greater the flow rate of the fluid, the greater the differential pressure value before and after the throttling part, so the flow rate of the fluid flowing through the throttling device can be measured by measuring the differential pressure. This measurement is based on the law of conservation of energy and the continuity equation of the flow.

 

4、Main functions and features

  (1) The wedge-shaped flowmeter can still work normally in the extreme environment of the field, with stable performance, high measurement accuracy, no moving parts, and not easy to be worn. It is with a simple structure, convenient installation and simple maintenance. The wedge-shaped flowmeter can be used in the extreme field environment of -40 ℃ ~ 80 ℃, and the design avoids the problem of freezing and blocking of the impulse pipe caused by low temperature.

  (2) when the measured medium is mixed with mud, sand and gravel, the measurement can still be carried out, and the accumulation of impurities in the flowmeter is avoided.

  (3) When the Reynolds number is low, the wedge flow can still be measured normally, and the turndown ratio is high.

5、Technical parameters

  1) Nominal diameter:DN50、DN65、DN80、DN100、DN150、DN200、DN250、DN300。

  2) Wedge ratio:0.2<h/D<0.6

  3) Reynolds number range:1000≤ReD

  4) Nominal pressure:16MPa、4.0MPa、6.3MPa、10.0MPa、16.0MPa、25.0MPa

  5) Accuracy:1.0Level

  6) Working temperature: -40 ℃ ~ 80 ℃

  7) Operating voltage: 9 ~ 36 DCV

  8) Protection grade: IP65

  9) Explosion-proof sign:Exia IICT4

  10) Output signal: RS-485

  11) Communication protocol: standard modbus RTU

  12) Electrical connection: M20 * 1.5 connecting thread

  13) Transmission data: standard instantaneous flow (m3/H), cumulative flow (m3), temperature (℃), pressure (MPa) and differential pressure (KPa).