FAQ - Wastewater Handling and Treatment Systems
What determines the pumping range of a float switch?
On a single float switch the tether length sets the pumping range. The longer the tether length, the greater the pumping range. Single float switches do have limitations on tether length, about 3 inches for most switches. On double float installations, the distance between the two float switches sets the pumping range. 12 inches between floats will give approximately one foot of drawdown.
What do I need to know in order to size a sewage or effluent pump?
All you need to know are these three things: 1) Pipe Size (1-1/2", 2", or 3") 2) Total Pipe Length 3) Total Lift Helpful Hints: * Knowing your estimated GPM (Gallons Per Minute) needs will also help in the pump selection. * Knowing if the pump will be required to pump solids will help determine the type of pump needed for the application. * Keep in mind that pipe size determines the minimum flow. (Ex. 1-1/2" pipe requires a minimum flow of 15GPM; 2" pipe requires a minimum flow of 20GPM; and 3" pipe requires a minimum flow of 45GPM)
What is the difference between a sump, sewage, and effluent pump?
Sump pumps are designed to handle small solids-about 1/4" to 3/8" in diameter. Sewage pumps will pass solids up to 2" in diameter. Effluent pumps will handle solids up to 3/4" in diameter.
ROTH/FRALO TANK INSTALLATION FACTS
- Absolutely NO WATER REQUIRED for backfill with Fralo tanks. The tank is specifically designed to be backfilled without water. The use of water prior to backfilling is not necessary and may cause installation problems. A nominal amount of water (6" - 8") may be used to ballast tank during backfilling.
- The tank MUST BE BEDDED INSCREENED MATERIAL (sand, pea gravel, stone dust, or other flowable fines). Native material is acceptable if it exhibits the same characteristics as select fill.
- It is imperative that the TANK HAUNCH BE SUPPORTED WITH FILL. This is the area of the tank under th mold part-line along the sidewalls curving down to the belly of the tank.
- The TANK BELLY MUST BE SUPPORTED WITH FILL. Due to the unique FRALO process, our tanks have a slight concave shape to the belly. Make sure that the tank feet are seated in the backfill and that the tank belly is well supported.
- FRALO tanks achieve full structural integrity once installed properly. SIDEWALL COMPRESSION THROUGH COMPACTED BACKFILL is the key to this integrity. Use backhoe to compact sidewall backfill if possible.
- CORRUGATIONS MUST BE PACKED SOLIDLY with backfill to achieve this. Compact backfill in 6" lifts as you backfill excavation.
- Backfill tank to top of roof all the way around, then, BACKFILL BETWEEN RISERES FIRST, then around the endwalls of tank. This technique will prevent backfill from pushing risers "in" or toward one another.
- In areas of high groundwater, the tank MUST BE FILLED immediately following backfill.
- Tanks are not designed or rated for vehicular traffic. Avoid operation of vehicles heavier than 2500 pounds. Maximum burial depth is 36" below grade.
- Drill the "A" dimples for ALL STATES AND PROVINCES (CANADA) EXCEPT FL, IL, AZ AND NE. The dimples are pre-offset at the factory. Drill the "B" dimples for IL, AZ and NE. All Florida destined tanks are pre-drilled.
- For installations with burial depths greater than 36", heavy clay or high groundwater, PLEASE CONSULT FACTORY AT 866-943-7256.
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