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RainGuard Inflow Protectors

Reduces Inflow. Controls Manhole Odors. Reduces Sewage Treatment Costs.

Reduces Inflow

With sewage treatment costs rising, and many city systems strained to the breaking point, city officials are taking a closer look at streamlining existing plant operations and sewer systems. One way to make treatment plants more efficient and cost effective is to eliminate rainwater and other run-off from the sewer system. LFM’s RainGuard Inflow Protector solves the problem of infiltration into the sewer system through manholes. On an average rainy day, a manhole can allow anywhere from 3,000 to 12,000 gallons of rainwater to enter the sewer treatment system. 

rainguard inflow protectors

Reduces Sewage Treatment Costs

The RainGuard Inflow Protector reduces sewage treatment costs by reducing the amount of rainwater and other run-off from entering the treatment system. 

Measuring Procedures

  1. Remove the existing manhole cover. 
  2. Clean the manhole rim or flange of any dirt or debris, to insure accurate measurement. 
  3. Locate the CLEAR OPENING of the manhole rim. This is the INSIDE DIAMETER measurement (ID) as shown in the diagram (at right). 
  4. Take two or three readings along the inside diameter circumference and record the smallest measurement to the nearest eighth of an inch. 
  5. Locate the outer edge of the manhole rim. This is the OUTSIDE DIAMETER measurement (OD) as shown in the diagram (at right). The OD measurement and the bottom of the manhole cover will have the same dimensions. 
  6. Take two or three readings along the outside diameter circumference and record the smallest measurement to the nearest eighth of an inch. 
  7. Provide dimensions A and B on the cover as shown in the diagram below. Please indicate the specific type of manhole frame and cover that you have, i.e. standard (heavy or light duty), locking, boltdown, watertight, etc.’ along with the name of the manufacturer, and if possible, include a drawing. 

Refer to Diagram 1 on right for critical dimensions which are required when ordering LFM RainGuard Inflow Protectors.