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A wastewater treatment plant required a cost effective method to measure and record waste gas flowing from the digesters to the boiler room burners and to a flare stack. The line sizes, flow rates and pressures for the system are as follows:
The facility's existing orifice plates and differential pressure transmitters needed to be resized for the current flow conditions. Orifice plate flow calculations were completed with the new flow conditions. Because of the low line pressure, the orifice plates were sized for a pressure drop of 3" H2O for the lines with 6-9" H2O input pressure and a drop of 10" H2O for the line with the 3 psig input pressure. Low range differential pressure transmitters were selected to measure the drop across the orifice plates and to transmit a 4-20 mA signal to a 4 channel circular chart recorder. The transmitter signal was converted to a square root within the recorder to reflect a flow rate in cubic feet per day. The recorder's LCD display can show the flow rate or total in cubic feet of gas for each input. Each flow rate is also recorded as a line trace on the chart. The total is printed on the chart as a written number with descriptive tags. For information about the products in this system, visit our Products or Types of Products pages from the Site Map or contact us about the products or system of interest. |
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Commercial Laundry
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A commercial laundry was required by the local Sewage Authority to
measure and record the pH and the total gallons per day of wastewater
sent to the treatment plant.
A pH controller monitors the condition of the wastewater from the washing machines and adds the appropriate chemicals to meet the Sewage Authority requirements. A mixer is also used to help disperse the chemicals. When the water reaches the proper chemical balance and the high level set point, a signal is sent to the submersible pump to empty the holding pit. The level sensor also shuts down the pump when the pit is at the low level set point. The drain is piped with a loop to stop any siphon that could empty the holding pit and to prevent any back flow from the drain. The loop also keeps the magnetic flowmeter tube filled with fluid which is a requirement for accurate flow measurement. The magnetic flow meter and pump are sized to prevent the holding pit from overflowing while the washing machines empty during the wash and rinse cycles. A strip chart recorder is used to display and record the pH and the number of gallons of wastewater sent to the treatment plant. The system ensures
that only treated water is released to the drain. For information about the products in this system, visit our Products or Types of Products pages from the Site Map or contact us about the products or system of interest. |
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