Franklin Electric 8 in STS Submersible Turbine Pump End - Ductile Iron

The STS Series is a submersible turbine: premium ductile iron castings, investment cast stainless steel impellers and spiral cutlass rubber intermediate bearings for wells with abrasive water. The STS family covers 90 to 1,450 GPM at best efficiency point and total dynamic head up to 2,300 ft, from 5 to 200 HP.

• Premium ductile iron casting for longer life and higher pressures
• Longer discharge and motor bracket bearings for increased pump life
• Investment cast stainless steel impellers for maximum abrasion resistance
• Spiral cutlass rubber intermediate bearings designed for abrasive environments
• 416 stainless steel pump shaft ground and polished for maximum durability

Open your flow class and find your model. Total head is the lift from the pumping water level, plus the pressure you need at the top (2.31 ft for every PSI), plus friction in the column pipe. Pick the model whose head at your flow covers that total.

Read from Franklin’s published STS curves in the FPS Submersible Catalog (Mi1007), 8 in STS Series section, digitized and rounded down to whole feet. A, B and C trim builds: Franklin’s single-stage curve for that impeller trim times the number of stages. X (mixed-trim) builds: Franklin’s published curve for that horsepower. Franklin prints no output tables or separate shut-off figures for this series; the 0 GPM column reads each curve at its first plotted point (0 or 1 GPM). Model numbers are shown without their last two digits (discharge size and motor fit), which do not change performance. Bold = the last plotted point; — = beyond it. Feet of head = PSI × 2.31.

Best operating range: Franklin marks the efficiency contours on each single-stage curve and prints no figures for the range. The curves are in the image gallery.

• 8 in minimum well I.D.
• 10 ft minimum submergence above inlet
• 4 in or 6 in NPT discharge
• 150 PPM maximum allowable amount of sand

• Install in a developed well; undeveloped water carries sand that wears the pump.
• Set the pump suction at least 10 ft below the expected drawdown level and at least 5 ft off the bottom of the well.
• Install a check valve immediately above the pump and another above ground; add one in the drop pipe every 100 ft of setting beyond the first 100 ft.
• Support the riser at the wellhead and keep the cable clear of clamps and the casing while lowering.

From the Franklin 6 in and 8 in submersible pump owner’s manual (106472101).

Irrigation, Agricultural, Industrial, Municipal and Commercial.