Lab Results
As the world leader in the field of lubricant viscometrics, RohMax has conducted extensive controlled laboratory testing to measure the impact of hydraulic fluid viscosity on pump performance.
A wide variety of fluid formulations have been evaluated under the following conditions:
- Low temperature start-up
- Normal temperature and pressure
- Peak operating conditions (high temperature and pressure)
- Extended operation
Through close collaboration with industry leading pump manufacturers and equipment OEMs, a thorough selection of pump types have been evaluated:
Pump rig design and operating conditions have all been reviewed and approved by leading OEMs and university experts.
Please review the following technical papers, which have been presented and published at major global fluid power and lubrication conferences:
1) Efficiency Advantages in Vane, Piston and Gear Pumps - What High VI Fluids Can Do For You! A collective summary of pump efficiency work conducted in a variety of controlled laboratory test stands, offering one technical paper that demonstrates the performance value of MEHF fluids in all pump types.
 IFK 2006 MEHF in Vane Piston Gear Pumps, IFK 2006
IFK 2006 MEHF in Vane Piston Gear Pumps Presentation, IFK 2006
2) Collaborative work between Komatsu and RohMax has resulted in a paper reviewing the performance of a variety of monograde and multigrade fluids in a widely used high performance Komatsu piston pump. The results show a significant advantage when using MEHF fluids, and provides support for the MEHF technical performance level definition.
FLAsia 2006 Komatsu piston pump, FLAsia 2006
3) How can you improve the value of your hydraulic fluid product line? MEHF addresses the current trends in equipment design and offers a fast payback on the higher cost of this high performance fluid.
MEHF Performance Advantages, ILMA Forum, 2003
4) The operating temperature of a hydraulic fluid is a function of system pressure and volumetric efficiency. The use of an MEHF can significantly reduce thermal stress on the fluid and reduce chances of overheating. This study presents a model to calculate the actual operating temperature of the oil in the pump, as well as the temperature increase of the oil as it passes through the pump.
IFPE 2005 MEHF Temperature Control
5) High VI fluids can show some loss of kinematic viscosity in service. A fluid formulated to meet the MEHF performance level will deliver a constant flow rate at all times, even over extended operating periods. This work documents MEHF flowrate stability in medium and high pressure pumps.
IFPE 2005 MEHF Flow Stability, IFPE 2005
6) How is pump efficiency measured, and how can it be modeled? Pump flowrate as a function of viscosity, pressure, and temperature are measured and mathematically modeled in this technical paper.
IFPE 2002 Predicting pump efficiency
7) What is the detailed technical definition of MEHF performance? What pumps and conditions have been used to evaluate MEHF, and what are the results?
Maximum Efficiency Hydraulic Fluids, M.E.H.F. 2005
8) Detailed information on vane and piston pump testing conducted to quantify the level of power increase or energy savings at standard operating conditions:
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