Erodible Wear Volume (EWV)
EWV is a metric which was created by legacy sucker rod guide manufacturers, defined as the volume of plastic able to be consumed prior to coupling-on-tubing contact (the plastic volume OUTSIDE of the coupling diameter). The rendering to the left visualizes this metric.
EWV is only truly comparable when similar materials are applied to the sucker rod guide designs in question, as the volume of erodible plastic and the rate at which is erodes away both play into overall sucker rod guide, stabilizer, or centralizer product life.
The Black Mamba Helical Stabilizer features up to 250% more EWV than other thermoset rod guides in the marketplace.