TIGERFLOW CD20 Vertical Multistage Pump - 88 GPM Nominal, NSF 61/372

The TIGERFLOW CD20 is a vertical multistage centrifugal pump: suction and discharge in line on a common base, stacked stainless steel impellers, and a NEMA TC-frame TEFC motor on top. TIGERFLOW builds it for pressure boosting of potable water, solid-free water in industrial and municipal plants, fire-system jockey pumps, boiler feed, HVAC circulation and irrigation. The model number gives the nominal flow (20 m3/h, about 88 GPM) and the stage count: more stages, more head at the same flow. Fill and vent the pump before it starts; it does not prime itself.

• Certified to NSF/ANSI 61 and NSF/ANSI 372 for drinking water; cULus Listed
• Hydraulically balanced; impellers and guide vanes stamped and laser-welded on robotic equipment
• Cartridge-style mechanical seal on every model for fast removal
• Premium-efficiency TEFC motors as standard; Minimum Efficiency Index (MEI) up to 0.7
• 304/316 stainless impellers and body; cast iron or 316 pump head and base

Each CD20 runs as one complete pump. Size it to the full peak demand at the pressure you need. For a packaged simplex booster with drive, panel and valves already piped, the Tigercub CD20 is built on this pump.

Each table shows the pressure the pump develops at the flow shown, in PSI. Find your model and read across: the first column is the shut-off, the most the model can make.

CD20 · Pressure in PSI at the flow shown · curves end at 154.1 GPM

Reading it: the CD20-6 holds 156 PSI at 88 GPM and 137 PSI at 116 GPM. Fed by a city main, the pump adds its pressure on top of what arrives.

Read from the published CD20 curves in the TIGERFLOW CD Series Vertical Multistage Pumps catalog (60 Hz, 3500 RPM), pp. 21-22, digitized from the catalog’s vector curve data and rounded down to whole PSI. Zero flow is the shut-off point — a ceiling, not a working point; TIGERFLOW prints no separate shut-off figure, so the 0 GPM column is where the dashed part of each curve meets zero flow. The solid (recommended) part of each curve starts at 57.2 GPM; 58 GPM is the first column inside it, the next two sit near 50% and 75% of the curve end, and the last column is the last regular digitized flow every curve reaches (the curve end is named above the table where it runs a little further). Single- and three-phase builds and the HP options of the same model run on the same curve. Feet of head = PSI × 2.31. The full curve, with power per stage and NPSHr, is in the image gallery.

Best operating range: 57.2 to 154.1 GPM, the solid section of TIGERFLOW’s published curve; below 57.2 GPM the curve is drawn dashed. The efficiency curve is in the image gallery.

• Bolt the base to a flat, solid stand that carries the whole base plate; the stand should weigh at least 1.5 times the pump and, for motors up to 40 HP, be 8 in larger than the base.
• Motors over 5 HP must be installed on a stand; never mount the motor below the base plate or inverted.
• Give every pipe its own support, independent of the pump. Keep the suction pipe short, airtight and no smaller than the suction port.
• Install isolation valves on both sides, a non-return (foot) valve against backflow, and a filter 1.6 to 3.3 ft ahead of the inlet.
• Leave 6 in clear around the motor, in a ventilated, frost-free place; outdoors, fit a rain cover over the motor.
• Check rotation at start-up: counterclockwise seen from the motor. Open the discharge valve slowly while bleeding air at the vent screw.

From the TIGERFLOW CD pumps installation, operation and maintenance manual.

Pressure boosting for potable water, solid-free water in industrial and municipal facilities, fire-system jockey pumps, boiler feed, HVAC circulation and irrigation.