TIGERFLOW Tigercub CD5 Simplex Variable Speed Booster System

The Tigercub is TIGERFLOW’s simplex booster system for small commercial buildings: medium-size apartment buildings, residential, hotels, municipal sites and shopping centers. Each one is a TIGERFLOW CD5 vertical multistage pump on a stainless steel base and manifold, with a variable frequency drive, a UL 508A listed disconnect panel and the valves already piped, prefabricated and factory tested as one UL / cUL listed packaged pumping system. The drive holds a constant pressure as demand changes, slowing the pump at low flow.

• Non-slam, center-guided stainless steel check valve
• Low suction or low-level alarm
• Liquid-filled pressure gauges and vibration isolators
• Union-ball valves on suction and discharge, with pressure port
• Single source responsibility, with a certificate of product liability insurance

The Tigercub is a simplex package. Size it to the building’s full peak demand now; TIGERFLOW builds duplex and larger packaged booster systems to order where the building needs a standby pump or more flow.

Pressure the pump adds at each flow, in PSI, at full speed. Find your model and read across; the first column is the most it can add.

CD5 · Pressure added in PSI, pump at full speed

Drawing from a tank or cistern — nothing arrives with pressure, so what the pump adds is what you get. Read the table straight through: the CD5-12 adds 163 PSI at 22 GPM.

Fed by a city main — the pump adds on top of what already arrives, and the drive slows it to hold your set point. With 40 PSI arriving, the CD5-20 still adds 135 PSI at 44 GPM, near its 44 GPM curve end, so it holds 175 PSI there; at a lower set point it needs to add less and runs slower. Incoming pressure turns into extra flow at the same set point.

Read from the published CD5 curves in the TIGERFLOW CD Series Vertical Multistage Pumps catalog (60 Hz, 3500 RPM), pp. 15-16, 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 13.2 GPM; 14 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. The figures are at full speed; the drive holds lower pressures by running slower. The Tigercub catalog prints the same single-pump curves (marked 3600 RPM).

Best operating range: 13.2 to 44 GPM, the solid section of the published pump curve. This is where the pump turns the most electricity into water pressure. Ask for more flow than it can deliver at your setting and it runs at full speed continuously, which is where motors and seals wear out. Sizing a booster to the building rather than to the headline numbers is what makes it last.

Medium-size apartment buildings, residential, hotels, municipal and shopping centers.