Basic Parameter
| Size Range | DN50 - DN5000 mm/Insertion type: DN500 - DN5000 |
| Measurement Accuracy | ±0.5%、±0.2% |
| Repeatability | ±0.1% |
| Turndown Ratio | Volumetric flow: 10:1 / 100:1；Mass flow: 8:1 |
| Working Pressure | Non-retractable averaging pitot tube: ≤29.00 MPa; Retractable averaging pitot tube: ≤10 MPa |
| Fluid Temperature | ≤450℃ |
| Medium Viscosity | ≤30 cP (equivalent to heavy oil) |
| Body Material | Sensor & three-valve manifold: optional 316L stainless steel, alloy steel, Hastelloy, Monel etc. |
| Accessory Material | Flange: optional 316L stainless steel, carbon steel, alloy steel, Hastelloy, Monel etc. |
Product Description
Attention
The Annubar Flowmeter is based on the velocity-area method and adopts the approximate integral theory.
It uses multiple sampling points to describe the flow velocity distribution equation, and its algorithm is established under the condition of fully developed velocity distribution.
Therefore, to achieve an ideal flow velocity distribution, a certain length of straight pipe section must be reserved upstream and downstream of the Annubar Flowmeter.
Installation Clearance Table for Annubar Flowmeter
| No. | Description | Schematic Diagram | Upstream Side A(Flowmeter in the schematic plane) | Upstream Side A(Flowmeter out of the schematic plane) | Downstream Side B |
|---|---|---|---|---|---|
| 1 | 1 tee or 90° elbow on upstream |  | 7D | 9D | 3D |
| 2 | Two 90° elbows on the same plane upstream |  | 9D | 14D | 3D |
| 3 | Two 90° elbows on different planes upstream |  | 19D | 24D | 4D |
| 4 | Pipe diameter reduction or expansion |  | 8D | 8D | 3D |
| 5 | Ball valve or other valves on upstream |  | 24D | 24D | 4D |
Possible Fault Causes & Troubleshooting Solutions
| No. | Fault Phenomenon | Root Causes | Elimination Methods |
|---|---|---|---|
| 1 | No differential pressure signal output | 1. High-pressure and low-pressure valves are closed;2. Equalizing valve is not fully tightened. | 1. Open high-pressure and low-pressure valves;2. Tighten the equalizing valve completely. |
| 2 | Insufficient differential pressure signal | 1. Leakage exists in pressure guiding system;2. Improper range matching of secondary instrument. | 1. Inspect the whole system thoroughly and eliminate leakage;2. Reduce the upper range limit of differential pressure transmitter. |
| 3 | Excessive differential pressure signal | 1. Improper range matching of secondary instrument;2. Back pressure hole clogged. | 1. Increase the upper range limit of differential pressure transmitter;2. Clean the measuring tube to remove blockages. |
The Annubar Flowmeter features easy installation, low pressure loss, high structural strength, wear resistance and zero leakage,
making it an ideal alternative to orifice plates. It is widely applied for flow measurement of blast furnace gas, compressed air,
steam and other liquids & gases in industrial and mining enterprises.
1.Unique internal secondary averaging structure delivers high accuracy (±1% of reading) and excellent repeatability (±0.1%).
2.The outer impact tube is machined from a single solid block without welding seams.
Compared with similar welded twin-body products, it achieves maximum mechanical strength and allows flexible selection of high-temperature resistant & anti-corrosion alloys.
a). Honeycomb hexagonal stable structure forms a distinctive flow field distribution, stabilizing low-pressure signals and generating higher differential pressure than competing products to improve the turndown ratio.
b). Compatible with square or rectangular ducts.
c). To solve the common clogging issue of competing meters when measuring dirty media, it supports an online retractable design, as well as manual & automatic purging systems, enabling maintenance without production shutdown.
d). Integrated unit consisting of averaging pitot tube, three-valve manifold, temperature & pressure compensation module and transmitter for simple and convenient operation.
e). No drift of flow coefficient, stable long-term performance.
f). Exclusive intuitive resonance check calculation ensures long-term stable operation.
g). Low pressure loss and energy consumption with remarkable energy-saving effect.
