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Pectoral direct mounting of transmitter

Pectoral direct mounting of transmitter

Description of the programme

The PITOBAR Averaging Pitot Tube is used to measure the flow of liquid and gases in horizontal or vertical pipelines. Its working principle is based on the classic or single-point pitot tube. Unlike single point pitot tubes, the PITOBAR Averaging Pitot Tube has several holes depending on the pipe size pointing to the upstream flow. 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:

  • 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 with multiple ports placed centrally within concentric rings with equal areas pointing towards the upstream flow. This is done to get the best averaging measurement of the dynamic pressure, resulting in a more accurate flow reading. The pitot tube creates a differential pressure signal that is 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 consistent 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 accuracy. 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 to escape.

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 direkt montering av transmitter

Installationsguide

Installationsguide för pitorör direkt montering av transmitter

Design and calculation standards

VDE/VDI 2640, ASME, DIN, EN 13480

Types

DK203 & DK253 with mounting flange. DK204 & DK254 with 3-valve manifold. DK205 & DK255 with 5-valve manifold.

Pipe sizes

DK20X: DN80 - DN1000, 3" - 40"
DK25X: DN80 - DN2000, 3" - 80"

Sample sizes

DK20X: 20 x 20 mm
DK25X: 25 x 25 mm

Pressure classification

PN 16 - 400, 150 - 2500 lbs, ISO PN 20, 50

Temperature range

-100°C - +350 °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

IEC 61518

Mounting neck

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

Accuracy

± 1 % accuracy of current 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

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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