ANSWER FIRST
A pressure target alone is not enough to select the pump.
A useful inquiry states the normal and peak flow, pressure required at the destination, static elevation, pipe and equipment losses, source pressure, liquid temperature and power supply. The selected operating point must then be checked on the curve for the exact CDLF configuration.
Six inputs that move a CDLF inquiry forward
- Normal and maximum flow. Separate everyday demand from short peak demand. Oversizing around an occasional peak can create poor operation during normal use.
- Required terminal pressure. State where the pressure is needed: at a tank inlet, process skid, top floor, filter or distribution header.
- Static elevation. Measure the vertical difference between the relevant source and delivery levels.
- System losses. Include piping, fittings, valves, filters, heat exchangers and other equipment at the design flow.
- Inlet condition. Give source-tank level, inlet pressure, temperature and suction-pipe arrangement. A multistage pump still needs adequate inlet pressure.
- Liquid and site data. Confirm that the liquid is clean and non-abrasive, then provide temperature, material concerns, power supply, control method and installation space.
The CDLF vertical multistage pump is intended primarily for clean-liquid systems needing higher head in a compact vertical arrangement. Wastewater, fibers or abrasive particles call for a different pump family.
Check more than one operating point
A booster does not normally work at one fixed demand. Plot minimum, normal and maximum flow against the system head. Confirm that each expected point remains within a suitable part of the selected model curve and that the motor is not overloaded.
| Condition | What to verify |
|---|---|
| Low demand | Stable control, minimum-flow needs and whether repeated starting will occur. |
| Normal demand | The principal selection point and expected continuous operating region. |
| Peak demand | Required delivery pressure, motor load and available inlet condition. |
| No-flow condition | Pressure protection, control response and whether the system can safely reach shutoff. |
Do not select from connection size, maximum head or motor power alone. Two pumps with similar motors can have different hydraulic curves. Use the official CDLF technical manual for model curves and dimensions, followed by a duty review.
Match the control method to demand
Fixed-speed operation can suit a stable process point. Variable-speed pressure control may suit demand that changes, while multiple pumps can be staged where the operating range or standby requirement justifies it. The system designer should define pressure sensing location, vessel arrangement, check and isolation valves, dry-run protection and safe pressure limits.
Control cannot repair a poor hydraulic selection. A variable-frequency drive does not create inlet pressure, remove cavitation risk or make solids suitable for a clean-water multistage pump.
Final approval checks
- The head calculation identifies static lift, terminal pressure and friction separately.
- The source level and inlet pressure are confirmed at the most demanding condition.
- Liquid cleanliness, temperature and wetted-material compatibility are reviewed.
- The room provides base support, pipe alignment, venting, drainage and maintenance access.
- The exact curve and dimensional drawing match the quoted configuration.
- Pressure protection and controls are coordinated with the whole system.
For the underlying calculation, use the related total dynamic head explainer.
Send a complete boosting duty.
Email flow range, required delivery pressure, elevation, pipe losses, inlet condition, liquid temperature, power and control preference to shscpv@gmail.com.
View CDLF pumps →