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Pitot tubes for larger pipe dimensions

Pitot tubes for larger pipe dimensions

Description of the programme

The PITOBAR Averaging Pitot Tube is used to measure the flow of liquids and gases in horizontal or vertical pipelines. Its working principle is based on the classic or single-point pitot tube. Unlike the single point pitot tube, the PITOBAR Averaging Pitot Tube has several holes, depending on the tube size, pointing to the upstream side. A port pointing downstream measures the static pressure. The main advantages of this flow element are its low installation costs and low pressure loss compared to other flow elements, especially in larger pipe dimensions.

Features and functions

  • Easy installation
  • Simple construction
  • Flexible placement in horizontal or vertical pipework
  • Minimal risk of leakage
  • Very low pressure loss
  • No moving parts

Design

The PITOBAR Averaging Pitot Tube is constructed with a diamond-shaped beam and multiple ports that are positioned centrally in concentric rings of equal area, facing the upstream side. This is designed to provide the best averaging measurement of the dynamic pressure, leading to 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 of uniform cross-sectional area and without obstructions. The internal pipe diameter must not deviate by more than 0.3 % to ensure accurate differential pressure calculations. To ensure accurate measurements, it is recommended to use full flow valves upstream of the primary element. 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 impurities, and regular maintenance is recommended to maintain accuracy. For proper instrument connection, the differential pressure transducer should be placed below the pitot tube in liquid and vapour flow, and above it in 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:

Produktspecifikation

Produktspecifikation Pitotrör för större rördimensioner

Design and calculation standards

VDE/VDI 2640, ASME, DIN, EN 13480

Types

PC450 & PC455

Pipe sizes

DN 500 - DN 6000: 20" - 240"

Sample sizes

45 x 45 mm

Pressure classification

Up to PN 100 (600 lbs)

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, others on request

Assembly

Welding on the pipe

Instrument connection

½" BSP or NPT

Accuracy

± 1 % of actual flow

Reproducibility

± 0.1 %

Reynolds number

Minimum 100,000 at full flow

Measurement area

10:1

Maximum flow rate

Liquids: 5 m/s, Gases: 80 m/s

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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