Pump selection advice

Help to select the most appropriate Flux pump:

  1. For low viscosity applications <1200 cP, determine if F300 or F400 Series pump is most appropriate. This will depend on several key factors:

    • Duty cycle / frequency of use
    • Environment
    • Flow / pressure considerations
    • Power source available
    • Container opening size

    Rule-of-thumb: For light-medium duty applications when electricity supply is available and viscosity is <250 cP, select F300 pump. For heavy duty applications, continuous running, flammable liquids, corrosive atmospheres or liquid viscosity <1200 cP, select F400 Series pump.

  2. For viscosities >1200 cP consider F500 Series high viscosity pumps.

  3. Check pump performance curves to determine if the pump selected can deliver the desired flow and pressure. Take into account static head, pipe bore size and pipe length.

  4. Consider electric motor options. What voltage, power rating, IP rating, temperature class, vapour ingress protection?

  5. For F400 series and F500 series pumps only, consider compressed air motor options.

  6. Check Flux chemical compatibility chart. Ensure pump materials are compatible with the liquids. Take liquid temperature, specific gravity and viscosity into account.

  7. Select required immersion length – 1000 litre IBC’s require a 1200 mm pump, 205 litre standard drums require a 1000 mm pump, 700 mm (and shorter) pumps are available for use with smaller carboys and containers. Longer pumps are also available for special applications.

  8. For high flow applications consider 50 mm diameter F400 Series pumps or special 100 mm diameter F430 container pumps.

  9. For high pressure applications, consider F500 series eccentric worm pumps, or F400 series pumps with high pressure “Z” impellers.

  10. Stainless steel F400 or F550 series pump with EX approval must be selected for handling flammable liquids with low flash points. We advise that EX approved equipment is used with liquids with flashpoint below 50 deg C. See further advice for pumping flammable liquids below.

  11. If the pump is to be used for one liquid (or similar liquids), consider F314 or F424 seal-less pumps.

  12. If the pump is to be used with several liquids, or where cross-contamination is not desirable, consider F310 or F430 series pumps.

  13. F310 or F430 series pumps should be selected when handling crystallizing liquids, or liquids containing solid particles, as the pump bearings are protected.

  14. If the liquid is valuable, or particularly toxic, consider F425 pumps with foot valves. These pumps can empty 99.98% of container contents and minimise spillage during container changes.

  15. For applications where mixing and pumping are required, consider F426 switchable mixer pumps – a lower cost solution when compared to a separate mixer and pump.

  16. Select F427 pump with hygienic approvals for food and pharmaceutical applications. Select F430 FOOD Ex pump for alcohols, foodstuffs containing particles, or where minimal cross-contamination between pumped fluids is desired.

  17. For dedicated IBC or tank emptying applications, consider MiniFlux and TR Series pumps for connection to bottom outlet. Consult Flux UK for advice on baseplate or trolley mounting solutions.

  18. Consider pump accessories required – wall hanging brackets, fume glands, compression glands, IBC caps, hose connections, hoses and trigger nozzles – see Accessories web page for further information.

Advice for pumping flammable liquids

ATEX certified equipment should be used for pumping many common flammable liquids, such as organic solvents, hydrocarbons, fuels and alcohols. Additional precautions may be required where the atmosphere above the liquid is very sensitive to ignition, e.g. carbon disulphide.

Liquids can become electrostatically charged when there is relative movement between the liquid and adjacent solids, or there is a second immiscible phase. The level of charge accumulation in a particular liquid (and therefore the electrostatic hazard that can be created) is strongly dependent upon the electrical conductivity of the liquid.

Many operations with flammable liquids produce flammable atmospheres by evaporation of the liquid being handled. If the surface temperature of the liquid is above its flash point, a flammable atmosphere should be assumed to be present. Where tanks are exposed to strong sunlight in a temperate climate it should be assumed that a flammable atmosphere could be present when handling liquids with flash points up to 55 °C. In areas of high ambient temperature and strong sunlight, flammable atmospheres may occur even with liquids that have flash points above 55 °C. For low flash point liquids it is necessary to assume that the atmosphere could be flammable unless it can be shown otherwise.

In some circumstances, the flammable atmosphere is not due to the liquid being handled but due to residues of volatile liquid or vapour from earlier operations.