This guide explains basic steps of using the crenger.com pump selector. It is used for pumps auto-sizing in the PlantDesigner platform.
Pump capacities
Unlike general-purpose industrial pumps, the desalination ones are built for efficiency.
But it comes at a price: the higher the efficiency the narrower the preferred operation range is. The narrower the operation range of the pump the less the number of potential customers is.
The manufacturers' marginal interest topped with the requirements for hard-to-handle corrosion-resistant materials like superduplex, hastelloy, and silicon carbide makes the selection of desalination pumps non-trivial at all.
So cornerstone principle of desalination pumps selection is their reusability. In other words, the desalination plants should be engineered around near-fixed capacities of the high-pressure feed pumps (installed before RO membranes).
This principle explains the selection of the sample mega-project names by Crenger. For instance, the S2300 plant is built around the 2300m3/h pump for Seawater.
Crenger recommends the following fixed capacities available on the market.
300 750 1000 1800 2300 2800
Each entry has roughly equal aggregate volume of sales – quantity multiplied by capacity.
Drive
Most of the desalination pumps are driven by variable frequency drives to extend their operation range. This option is default.
Fluid
In selecting the right pump the manufacturers use fluid temperature lower than the ones specified by the customer. Given this, Crenger sets the default temperature of any fluid type to 16oC.
Operation
If operation in parallel is selected, Crenger avoids drooping curves and checks the operability of the pumps when one is out of service. (not yet implemented)
Service & Design
Here the objective is to identify the uncertainties of the pump flowrate and head selection on the designer side. The ultimate case is when instead of the pump head, its service is specified like "low pressure booster" or "ERS booster". Probabilistic nature of input is described by "around the head" or "near flow" entries. They do not requires the service definition.
Process
Do not forget to check the points of interest.
Plant area
This entry is used only for reporting (not yet implemented)