INDUSTRIAL FLOW METER

PITOBAR – Steam Flow

EMCO PITOBAR Averaging Pitot Tube for Steam Flow (Type DK251)
The PITOBAR Averaging Pitot Tube is used for flow measurement of liquid and gasses in horizontal or vertical pipe lines. The PITOBAR Averaging Pitot Tube principle of operation is derived from the classic or single point pitot tube. As opposed to the single point pitot tube, the PITOBAR averaging pitot tube has a number of holes depending of pipe size pointing towards the up-stream side. One port pointing down stream measures the static pressure. The PITOBAR has very low installation costs and the pressure loss is low compared to other flow elements, especially in larger pipe sizes.

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หมวดหมู่: Differential Pressure, Flow Meter, Pitot Tube

แบรนด์: EMCO

Overview

Design
The PITOBAR Averaging Pitot Tube is constructed and designed with a diamond shaped strut with several ports spaced centrally within concentric rings of equal area pointing towards the upstream side. This is done in order 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 which is proportional to the flow rate: Differential Pressure = ( Pstatic + Pdynamic) – Pstatic.

Installation
For optimal installation, the pitot tube should be placed in a straight cylindrical pipe with consistent cross-sectional area and free from obstructions. The inner pipe diameter must not deviate by more than 0.3% for accurate differential pressure calculations. To ensure accurate measurements, it is recommended to use full bore valves upstream of the primary element. The inner pipe wall roughness should meet specific limits depending on the material used. For steam flow, a horizontal mounting with a 5-degree slope is advised to facilitate condensate flow. Purge connections are available for fluids with impurities, and regular maintenance is suggested to maintain accurate readings. For proper instrument connection, the differential pressure transmitter should be positioned below the pitot tube for liquid and steam flow, and above it for gas flow, with impulse lines sloped to allow air escape.

Features

Easy to install
Simple construction
Free choice for horizontal or vertical pipe run
Risk of leakage is minimized
Very low pressure loss
No moving parts

Specifications

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″
Pressure rating	PN 16 – 40, 150 – 300 lbs, ISO PN 20, 50 (for higher pressure ratings a welded construction will be offered instead of flanged)
Temperature range	-100°C – +450 °C
Material PITOBAR	Stainless steel AISI 316, other stainless grades on request
Material mounting part	Carbon steel, stainless steel AISI 316, other on request
Process connection	Flange according to pressure rating
Flange standards	DIN, ANSI
Bottom support	For larger pipe sizes and high velocities
Instrument connection	DK251: ½” BSP, NPT or BW
Mounting	Welding to the pipe
Mounting neck	Standard lengths, 130, 180, 250 mm, other lenghts available

Technical Data



Accuracy	± 1% accuracy of actual flow
Repeatability	± 0,1%
Reynolds no.	Minimum 100.000 at full flow
Rangeability	10:1
Max. fluid velocity	80 m/s
Probe size	25 x 25 mm