Pitot tubes are a time-tested method of measuring air flow in combustion ducts. Pitot tubes are easily installed, highly cost-effective, easily maintained and can be inserted into almost any duct configuration including primary, secondary, tertiary and over-fired air ducts to name a few. Although pitot tubes do require upstream and downstream straight duct runs to operate most accurately, they are a very cost effective way to manage boiler trim controls and to maintain control over the fuel-to-air ratio in almost any power generation application.
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TECHNICAL INFORMATION
Below, you can find the manuals for the VAP Pitot family of flow elements. The manuals have been divided into the Mechanical Manual for the element itself and the Electronics Manual for the use and installation of any transmitter that was purchased from Eastern Instruments.
The VAP/PA Pitot is designed for particulate-laden applications. When oriented in the PA configuration, the VAP Pitot can be placed in heavily particulate or condensate-laden environments while still measuring accurately and reliably without being prone to plugging problems.
VAP/SA (Superior Accuracy)
Ideally designed to provide accurate differential pressure outputs for precise air flow measurement in process applications, the VAP/SA is suitable for relatively clean process environments (such as clean flows or filtered gas streams), where high accuracy is required for measurement and control.
An accuracy to within +/-2% and repeatability to within +/-0.1% is achievable, depending on upstream and downstream straight runs.
Minimizes turbulence at the sensing ports, preventing particulate buildup and also designed for high turn-down applications.
Velocity averaging throughout the full traverse of the duct with multiple pitot array.
Constructed from extruded 6063 series aluminum with a final process Teflon hard anodized coating, yielding a surface hardness of Rockwell 65C. Also available in Stainless Steel and PVC.
Each VAP/PA and VAP/SA Pitot probe can be inserted into the duct utilizing a prefabricated weld-on insertion port. When multiple probes are needed within the duct, the total and static sensing ports can be manifolded together.
Due to the streamlined, narrow cross-section of the Parallel Plate Pitot design, the VAP/PA and VAP/SA will not restrict the airflow, therefore there will be minimal, if not negligible, pressure drop across the measurement area. Integrated temperature elements are available to further reduce in-duct obstructions.
There are no active, electronic components or moving parts that are installed within the air stream, therefore eliminating maintenance costs and ensuring reliability.
Heated Pitots, High Velocities, Large duct installations (VAP/XL Pitots (Up to 240 inches)), and much more to meet customer-specific needs.
VAP PITOT APPLICATIONS - POWER
Eastern Instruments offers a complete line of air flow measurement pitots and accessories for a wide variety of power related applications. Based on more than 35 years of pitot development and product improvements, our pitots, and especially our PA or plug resistant pitots, are second to none. Whether increasing boiler efficiency or optimizing combustion, rest assured that Eastern Instruments can provide you with a system that will fit your needs.
ROUND DUCT INSTALLATIONS
VAP Insertion Style pitots can be used in either round ducts or in square/rectangular ducts. When used in round ducts, the insertion ports are typically beveled to fit the curved exterior of the duct wall and can be inserted into any duct smaller than 72" in diameter. Just a few of the applications for the VAP Pitot's industrial applications are listed here:
The VAP Pitot can also be utilized in Square/Rectangular duct work when the straight upstream and downstream duct requirements are met. Just a few of the VAP Pitot's Industrial applications are listed here:
Below, you will find a variety of product literature including product catalogs, single page cut sheets and various application guides that can assist in selecting the correct flow element for your project. If you have any questions, please feel free to contact us as well.
AIR FLOW PRODUCT CATALOGS
CUT SHEETS
MISCELLANEOUS DOCUMENTATION
VAP PITOTS IN COMBUSTION AIR
Eastern Instruments' VAP Pitots have a unique Velocity Averaging and Parallel Plate proprietary design. When inserted into the air flow ducts of a power plant (both Round Ducts and Square/Rectangular Ducts), the VAP Pitots provide an accurate, differential pressure output allowing for precise air flow measurement or control of your process. VAP Pitots designed for power plants are designed with Plug resistance in mind as many ducts have particulate in the ducts that normally plug measurement devices and cause dramatic inaccuracies in flow measurement. The VAP PA Pitot (Particulate Applications) can be installed in existing or new ducts or incorporated into flow-conditioning devices, such as the High Beta, designed for short duct run applications with turbulent air flow or to obtain optimal accuracy.
Each VAP Pitot has multiple total and static sensing ports, specifically located to provide a full traverse of the duct, thus eliminating the concern of highly random distribution of air flow. For larger ducts, an array of pitots, with total and static pressure lines manifolded, can be installed to ensure an equal area traversing and fully averaged air flow sampling. The VAP Pitots are erosion resistant and can handle typical process temperatures from -40o to 900oF, with a variety of engineered options available as well.
VAP/PA - PARTICULATE-LADEN APPLICATIONS
A proprietary design for Particulate-laden applications (PA), the VAP/PA air flow measurement pitots are ideal for either new or retrofit processes, and power generation applications. When inserted in air flow ducts, the VAP/PA provides an accurate, differential pressure output allowing for precise air flow measurement and control of your process to as low as +/-2% when calibrated, utilizing a plug-resistant design that resists plugging, even in air streams containing high levels of fly ash or other contaminants. The VAP/PA pitots can also be incorporated within flow-conditioning devices, such as the High Beta, designed for short duct run applications with turbulent air flow, or to obtain the maximum accuracy.
SPECIALIZED PITOT VERSIONS
ANODIZED ALUMINUM - MOST APPLICATIONS
The VAP Anodized Aluminum Pitot is designed as an extremely accurate, low-cost solution for air flow measurement in clean or particulate-laden air streams. The VAP Aluminum Pitot is perfect for air streams with temperatures under 700 degrees F (371 degrees C).
For high temperature applications in which air or gas temperatures can reach 900 degree F (482 degrees C) Stainless Steel VAP Pitots are available. The Stainless Steel pitot is also great for applications in which caustic materials are being measured.
The VAP XL Pitot is a larger version of the standard VAP Pitot that is specially designed to span the large distances of very large ducts. Just as the standard VAP pitot, the VAP-XL offers extremely accurate differential pressure (or flow pressure) of air or gas in ducts. The VAP-XL pitot is constructed entirely out of Anodized Aluminum and can be used in either clean air or air streams with particulate in them.
