How to Measure Static Pressure in a Baghouse
Static pressure as defined by staclean.com refers to the amount of potential pressure exerted on a fluid. The measurement is usually expressed in inches. Sly Limited further defines static pressure as a measurement in a bag house as an indication of static resistance of air flow across the cloth bag of the bag house, or across the bag house itself. This measurement is a method to determine the amount of dust collection on filter media and if proper records are kept, to reveal the conditions of the bags inside the bag house. Static pressure is measured either by Magnehelic or Photohelic gauge.
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Instructions
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Magnehelic Gauge
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1
Select a location for installation. The location must be accessible so that pressure readings as well as maintenance or change out of meters can be easily and safely be made. Consideration must be given to the amount of tubing needed to connect the gauge to baghouse mechanisms.
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2
Calibrate the gauge. While ensuring the gauge is level, turn the adjusting screw on the face of the gauge until the needle reads zero.
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3
Mount the gauge. The gauge must be mounted on an adequate surface. Avoid surfaces with excess vibration as such vibrations interfere with accurate readings according to magnehelicgauge.com.
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4
Connect the gauge to the bag house. Use plastic tubing to connect the high and low pressure ports of the gauge to the baghouse filter cabinet and clean air chamber. The tubing leading to the high pressure port of the gauge must be connected to a fitting in the upper filter cabinet and the low pressure port connected to clean air chamber.
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5
Take pressure readings. For new bags, pressure readings should be less than or equal to 2 inches. Pressure greater than 6 inches indicates bag cleaning is needed. Pressure greater than 8 inches means that bags must be replaced.
Photohelic Gauge
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6
After calibrating the gauge, connect the gauge portion of the Photohelic gauge in the same manner as the Magnehelic gauge previously described. Always install the Photohelic gauge in an indoor location and not on the dust collector. The Sternevent Co. indicates that the gauge must also be wired to a timer located in an enclosure for proper operation.
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Attach a pulse controller. The Sternevent company advises that the SmartPulse controller be wired as stated in the product manual and similar to the gauge, installed in an indoor location and in an enclosure.
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Allow the Photohelic gauge to operate as normal. The Photohelic gauge will take readings just as the Magnehelic gauge does, but the electrical portion of this gauge will tell baghouse machinery based on readings when to self clean baghouse apparatus.
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References
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