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Pitorör EMCO Averaging Pitot Tube

Pitorör EMCO Averaging Pitot Tube

Description of the programme

The PITOBAR Averaging Pitot Tube is used for flow measurement of liquids and gases in horizontal or vertical pipelines. The operating principle of the PITOBAR Averaging Pitot Tube is based on the classic or single point pitot tube. Unlike the single point pitot tube, the PITOBAR has several holes, depending on the tube size, pointing to the upstream side. A port pointing downstream measures the static pressure. PITOBAR has very low installation costs and the pressure drop is low compared to other flow elements, especially in larger pipe dimensions.

Features and functions

  • Easy installation
  • Simple construction
  • Flexibility for horizontal or vertical pipework
  • Minimal risk of leakage
  • Very low pressure drop
  • No moving parts

Design

The PITOBAR Averaging Pitot Tube is constructed with a diamond-shaped beam and multiple ports that are positioned centrally within concentric rings of equal area, facing the upstream side. This is done to get the best averaging of the dynamic pressure, resulting in a more accurate flow reading. The pitot tube creates a differential pressure signal proportional to the flow rate: Differential pressure = (Pstatic + Pdynamic) - Pstatic.

Installation

For optimum installation, the pitot tube should be placed in a straight cylindrical tube with a uniform cross-sectional area and free of obstructions. The internal pipe diameter must not deviate by more than 0.3 % to ensure accurate differential pressure calculations. To ensure accurate measurements, the use of full flow valves upstream of the primary element is recommended. The roughness of the inner pipe wall should fulfil specific limits depending on the material used. In case of vapour flow, horizontal mounting with a slope of 5 degrees is recommended to facilitate condensate flow. Purge connections are available for liquids with contaminants, and regular maintenance is recommended to maintain accurate readings. For proper instrument connection, the differential pressure transmitter should be placed below the pitot tube for liquid and vapour flow and above it for gas flow, with impulse lines inclined to allow air discharge.

Requirements for straight pipe lengths
Certain installation requirements for straight pipelines must be met to achieve the most accurate flow measurement. See the table below.

Maximum authorised differential pressure
Without bottom support, with reference to mechanical bending. Pressure is measured in bar. See table below.

Produktspecifikation

Produktspecifikation för pitorör EMCO Averaging Pitot Tube

Installationsguide

Installationsguide Pitorör EMCO Averaging Pitot Tube

Design and calculation standards

VDE/VDI 2640, ASME, DIN, EN 13480

Types

DK251, DK251/3 with mounting flange, DK251/4 with 3-valve manifold, DK251/5 with 5-valve manifold

Pipe sizes

DN 100 - DN 2000, 4" - 80"

Sample sizes

25 x 25 mm

Pressure classification

PN 16 - 40, 150 - 300 lbs, ISO PN 20, 50 (for higher pressure ratings, welded construction is offered instead of flanged)

Temperature range

-100°C - +450°C

Material PITOBAR

Stainless steel AISI 316, other stainless steel materials on request

Material mounting part

Carbon steel, stainless steel AISI 316, other materials on request

Process connection

Flange according to pressure classification

Flange standards

DIN, ANSI

Bottom support

For larger pipe sizes and high speeds

Assembly

Welding on the pipe

Instrument connection

DK251: ½" BSP, NPT or BW

Mounting neck

Standard lengths: 130, 180, 250 mm, other lengths available

Accuracy

± 1 % of actual flow

Reproducibility

± 0.1 %

Reynolds number

Minimum 100,000 at full flow

Measurement area

10:1

Maximum flow rate

80 metres per second

Accessories

Shut-off valves: needle valve or ball valve

Brand

EMCO Controls

EMCO Controls specialises in flow and level measurement solutions. Their high-quality instruments are used to ensure accurate monitoring and control in various process industries.

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