Averaging Pitot Tube (annubar)

Thermal Instrument is the leading Averaging Pitot Tube Manufacturer in India providing reliable solutions for accurate pressure measurement to process industry worldwide.

Averaging Pitot tube is a multiport self-averaging flow meter. It is a primary element for flow measurement of gas, liquid, vapour in pipelines and ducts based on the principle of measurement of differential pressure created when an obstruction is placed in the fluid flow due to an increase in fluid velocity.

Averaging pitot tubes are generally used for large line sizes or ducts where other primary devices become relatively expensive.
Averaging Pitot tube comprises of following components:

* Outer impact tube – one piece construction

* Internal averaging tube

* Low-pressure chamber

* Head

The outer impact tube has a number of pressure-sensing holes facing upstream which are positioned at equal annular points in accordance with a log-linear distribution. The ‘total pressures’ developed at each upstream hole by the impact of the flowing medium are firstly averaged within the outer impact tube and then to a second order (and more accurately) averaged within the internal averaging tube. This pressure is represented at the head as the high-pressure component of the DP output. The low-pressure component is generated from a single sensing hole located on the downstream
side of the outer impact tube. A stable flow coefficient which is the result of a typical diamond shape, makes it a reliable flow-measuring primary flow element. Simple and inexpensive, long-term accuracy within acceptable limits over a wide range of flow, low permanent pressure loss & minimum operating cost make it an ideal choice for any design engineer. Retractable arrangements can be provided on request for online maintenance without stopping the flow.

Routine tests:

c) Dye Penetration test
d) Hydro Test
g) Calibration
h) NACE

Features:

• Unique profile shape enables high flow rate turn down
• Dual averaging for better accuracy
• Suitable for Liquid ,gas and steam flow measurement
• Repeatability of measurement ± 0.1 %
• Short upstream and downstream straight pipe lengths
• Long term accuracy unaffected by wear.