Steel mill rolling mill lube oil has long been accepted as oil that is commonly dirty and not much is done to remedy that.  One steel mill partnered with Hy-Pro to come up with a solution achieve & maintain a suitable level of fluid cleanliness for their rolling mill lube oil.

Regular tests of heavy-duty gear oil were consistently at unacceptable ISO cleanliness ratings.  Filter and oil replacements were becoming a frequent and costly occurrence.  The challenge was to upgrade the current system equipped with only 74 micron wire strainers and improve from a 21/21/15 ISO code on their 6,000 gallon / 22,500 liter lube reservoir.

Dedicated FSL3 off-line high viscosity system (22 gpm, 82.5 lpm) was installed on the 6,000 gallon / 22,500 liter reservoir containing Mobil 634 gear lube.  


HP107L36-3MB 3 micron absolute rated Hy-Pro element was used in the FSL and with in three days of starting the trial the ISO code had dropped from 21/21/15 to 18/16/12.  This yields an 87.5% reduction in particles 4µ[c] and larger, a 94.3% reduction in particles 6µ[c] and larger and a 90.1% reduction in particles 14µ[c] and larger.

What HY-PRO provided:

  • Dedicated Filtration
  • FSL Off-Line FIltration
  • High Viscosity Filtration

Download the Full Case Study