Annubar Averaging Tube Flowmeter
Annubar Averaging Tube Flowmeter
Insertion-type averaging pitot tube — minimal pressure loss, hot-tap installation, suitable for large bores.
- Minimal pressure loss
- Hot-tap installation / removal without flow interruption
- Suitable for very large bores
Overview
The HUALIU Annubar averaging pitot tube flowmeter (also known as a flute-type averaging tube flowmeter) is a new type of differential-pressure sensing element developed from the pitot-tube velocity-measurement principle. It outputs the differential-pressure signal formed between the high-pressure-side (dynamic) and low-pressure-side (static) pressures and, when combined with a matched DP transmitter, accurately measures the flow of a wide range of liquids, gases and steam (including superheated and saturated steam) in circular and rectangular ducts, over a bore range of DN50–DN5000. It is widely used in the power, chemical, petroleum and metal-smelting industries.
As an insertion-type DP flowmeter, this product offers easy installation, minimal pressure loss, low energy consumption, high strength, freedom from wear effects and no leakage, making it an ideal replacement for the orifice plate. Its proprietary internal secondary-averaging structure delivers high accuracy and high repeatability; the outer impact tube is machined in one piece from solid material with no welds, giving it greater strength and allowing selection of high-temperature and corrosion-resistant materials. The honeycomb hexagonal stabilizing structure makes the low-pressure signal more stable and the differential pressure higher, thereby improving the turndown ratio.
To address the clogging that dirty media tend to cause, the product offers a retractable (in-line withdrawable) version and manual/automatic purging options, enabling maintenance and installation without shutdown or flow interruption — particularly suited to large-bore pipeline retrofits. The averaging tube can be integrated with a manifold, temperature/pressure compensation and a transmitter into a single assembly; with no flow-coefficient drift, long-term stability, easy installation and significant energy savings, it is a reliable choice for flow measurement of blast-furnace gas, compressed air, steam and similar media in industrial and mining enterprises.
Specifications
| Nominal diameter (DN) | DN50–DN5000 mm (insertion type DN500–DN5000) |
| Accuracy class | ±0.2%, ±0.5% |
| Repeatability | ±0.1% |
| Turndown | Volume flow 10:1–100:1; mass flow 8:1 |
| Working pressure | Non-retractable type ≤29.0 MPa; retractable type ≤10 MPa |
| Medium temperature | ≤450 ℃ |
| Medium viscosity | ≤30 cP (equivalent to heavy oil) |
| Applicable media | Liquids, gases, steam (including superheated and saturated steam) |
| Body material | 316L stainless steel, alloy steel, Hastelloy, Monel, etc. (optional) |
| Structural form | Intelligent integral, remote |
| Probe type | Insertion, in-line, on-line-installation, jacketed (heat-traced), corrosion-resistant, square-tube tapered, wafer type |
| Connection type | Threaded connection, wafer type |
| Pressure rating | P1 (1.6–6.3 MPa), PH (special high pressure to order) |
| Compensation type | None, single-pressure, single-temperature, pressure-and-temperature compensation |