Pumping World News Blog

Trailer Pump Operation and Performance (Part 1 of 3)

Posted by Elizabeth Kaiser on Thu, Dec 15, 2011 @ 10:12 AM

By Isaiah Helm, SRS Crisafulli Applications Engineer

Crisafulli pumps are naturally robust, and capable of handling a variety of unscreened water-borne debris and slurry mixtures.  The following table lists the maximum sizes of spherical solids each model can pass without clogging.


Impeller (in)

Solid Size (in)
















Occasionally the pump's speed will have to be changed to get more or less flow and pressure.  A small change in speed can result in a large change in power required.  Increasing the speed by a factor of 2 increases the horsepower requirement by a factor of 8 (2 cubed).  This can be estimated with the Affinity Laws below, taken from the Cameron Hydraulic Data Book (Flowserve Corporation):

Crisafulli Pump Curve 

H = Heads in feet

Q = Capacities in gallons per minute

S = Speeds in revolutions per minute

BHP = Brake Horsepower

Subscript 1 is for original design conditions.

Subscript 2 is for new design conditions.

Note: The Affinity Laws lose accuracy with larger speed variations.  Consult with the factory when considering speed changes of more than 20%.

A pump's impeller may need to be changed in order to get more flow and pressure or to require less horsepower with resulting less flow and pressure.  SRS Crisafulli offers up to three different impeller styles for each pump size.  They are referred to as Regular Lift, Intermediate Lift, and High Lift impellers.  The difference is their diameter.  For a change from a 16 inch Regular Lift impeller to a 21 inch High Lift impeller, the flow would increase by a factor of 1.3, the pressure by a factor of 1.7, and the power by a factor of 2.2.  This effectively doubles the horsepower requirements without changing the pump speed.

While Affinity Laws exist for diameter changes, they are only accurate for small changes of 5%-10%.  The best way to understand this relationship is to view the pump performance curves for the various impellers offered by SRS Crisafulli.


Request a consultation with one of our Applications Engineers/Specialists.

Watch a Crisafulli Trailer Pump Video.

Watch a Crisafulli pumps slideshow.

Topics: crisafulli, srs crisafulli, Product Information, agriculture, slurry trailer pumps, Equipment Dealers, pumps and power units, mining, Replacement Part

SRS Crisafulli Product Spotlight: Slurry Trailer Pump

Posted by Elizabeth Kaiser on Mon, Jul 25, 2011 @ 15:07 PM

slurry pumpToday's SRS Crisafulli Slurry Pumps are the latest versions of a 40-year tradition - i.e., building highly efficient, rugged long lasting slurry pumps for use in agricultural waste pits.

SRS Crisafulli Slurry Pumps also work well for refineries, municipalities and geothermal plants.

Discover the versatility and productivity of SRS Crisafulli Slurry Pumps when used to remove viscous wastes from your ponds and lagoons.

See Video of Slurry Trailer Pump in action here.


Topics: agriculture, Announcements, Press Release, slurry trailer pumps