Wedge flow meter
- Commodity name： Wedge flow meter
- Product Description
-
Overview
Wedge flowmeter is a differential pressure flow measurement instrument, characterized by simple structure, reliable performance, convenient installation and use, and low cost. It is suitable for measuring flow in situations with low flow rates, small flow volumes, and large pipe diameters. It can measure high viscosity heavy oil, residual oil, diesel, lubricating oil, industrial gas, coke oven gas, blast furnace gas, generator gas, city gas, hydrogen, nitrogen, air, steam, wastewater liquids and other media.
Working Principle
The working principle of the wedge flowmeter is based on the law of conservation of energy - Bernoulli's equation and the continuity equation of flow. When the fluid flows through the V-shaped throttling element (also known as wedge-shaped flow resistance or wedge block) and the arc-shaped channel formed by the inner wall of the measuring tube, a differential pressure is generated on the upstream and downstream sides of the throttling element. The square root of this differential pressure is proportional to mass or volumetric flow rate within a certain range of Reynolds numbers (500-106). Different ratios of arc height h to pipe diameter D (wedge ratio h/D) determine different flow measurement ranges.
Flow equation for wedge flowmeter:
Where: qv - volumetric flow rate, m3/s
C - discharge coefficient;
ε - expansibility coefficient;
m - throttling area ratio,
D - pipe inner diameter, m;
Δp - differential pressure, Pa;
ρ - density of the measured medium, kg/m3.Technical Parameters
1. Accuracy level: 0.5 level, 1.0 level
2. Range ratio: 10:1
3. Measured media: liquid, gas, steam
4. Applicable range of Reynolds number: 500~1×106
5. Medium viscosity: 500mPa.s
6. Working pressure: up to 42MPa (CL2500)
7. Working temperature: below 400°C
8. Applicable pipe diameter: DN15 mm—DN1200 mm
9. Wedge ratio: 0.2—0.5Application Range
1. Gases
Coal gas;
Natural gas, including high moisture natural gas and unclean natural gas containing other impurities;
Air, including air containing moisture, solid particles and other suspended substances.
2. Steam
Saturated steam, superheated steam
3. Liquids
Oils: including crude oil, fuel oil, coal tar, residual oil, paraffin oil, water-containing emulsion oil, wastewater containing sand and sludge.
Slurries: including oil slurry, iron ore slurry, pulp, mud, coal slurry.
Water: including clean water, wastewater, industrial wastewater, river source water containing sand and debris.
Various aqueous solutions: including strongly corrosive acids, bases, salt solutions and solutions that are prone to crystallization or contain many suspended substances.
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