Hydraulic systems & components

Testing flow and system pressure

Fourth Quarter 2021 Hydraulic systems & components

A Business Day headline recently cried: ‘Oil prices rise as energy markets tighten’. The price of Brent Crude has soared from $20 a barrel in April 2020 to $85 a barrel currently − an increase of 325% “This poses a serious challenge to hydraulic maintenance staff,” says Hydrasales general manager, Elvira Caripis. “Once again hydraulic oil becomes black gold. At these high prices, can our industry afford to dump thousands of litres of oil?”

Design engineers and service providers should not neglect equipment and system maintenance. There may be temptations to extend the service cycle or delay maintenance timespans. The quality of the oil should not be compromised.

There are always risks of increasing particle contamination and corrosion of the equipment, with resultant equipment failure. Oil analysis and monitoring is required to assess contamination, the chemical composition, levels of water content as well as viscosity which may result in the need for an oil change.

MP Filtri, a global brand in hydraulic filtration and accessories, recommends well maintained and clean systems. Contamination specialist, Geoff Grant and consultant, Mike Day, observe: ”In a study by Dr E. Rabiniwicz of the Massachusetts Institute of Technology, the observation was made that 70% of component replacement is due to surface degradation. In hydraulic and lubricating systems, 20% of these replacements result from corrosion, with 50% resulting from mechanical wear. Most hydraulic systems will generate contamination externally or internally through fluids, component wear and tear, or just bad housekeeping. These contaminants can ultimately cause system inefficiencies or failures. The bottom line is costly repairs, system downtime and production decline.”

They summarise the requirements for monitoring fluid cleanliness as follows:

• The need to measure relatively low concentrations of small particles from four micron upwards.

• The need to measure a wide range of particle sizes and particle concentrations.

• The ability to present data in an industry acceptable form e.g. cleanliness coding systems such as ISO 4406 or AS 4059.

• Approval by the ISO Committee developing particle counting standards for the hydraulics industry.

• Proven accuracy and repeatability.

• The need to provide results immediately or in a short time so that corrective actions can be effected with minimum delay.

• The ability to analyse a wide range of fluid types such as hydraulic, lubrication, wash and solvent fluids.

• An acceptable cost.

Hydrasales distributes a full range of MP Filtri hydraulic filters and accessories and offers a free service to help with filtration sizing through the MP Filtri Filter Sizing software and to provide full technical support. Hydrasales sales manager, Cheryl Johnson, says: “We have had remarkable results in using the software, which has helped tremendously in identifying the appropriate filter for an application.” The end result is a comprehensive report that identifies the viscosity of the filter fluid at the specified temperature that affects the pressure drop or differential pressure. Detailed drawings are produced, with 3D modelling available for upload to drawing programs.

It is vital to enter the required application data such as system pressure, flow rate, operating temperature, oil type and viscosity, thereby ensuring the most appropriate filter calculation. When searching for components, the user will only have to enter the model, or the type of pump, or the motor data for shaft couplings, spider and bellhousing results.

Mobile filtration units

Specialising in particle counters and hydraulic filtration, MP Filtri provides a complete set of high-tech, fixed or portable engineering solutions measuring the levels of fluid contamination. Mobile filtration units provide the perfect solution for the maintenance of lubrication oil and hydraulic fluids in off-line filtration applications. With a versatile and compact design, they are used to pre-filter, transfer or condition hydraulic fluids from existing circuits to new ones, or to clean existing ones during oil changes, filling and flushing, as well as removing any water residues. Available for different flow rates, they can be equipped with an MP Filtri device for online contamination monitoring with the ICM Contamination monitor, according to ISO4406.

“Engineers must incorporate processes to check the quality of the oil, the levels of moisture and the effectiveness of the systems filtration. They must also monitor the levels of contaminants by obtaining data from a contamination condition monitor, ensure the system temperature is within the specified tolerances, check on accessories such as breathers and conduct regular testing of flow and pressures to check compliance with the system parameters,” concludes Banks.


Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Oil-free beer and wine processing
Pneumatic systems & components Hydraulic systems & components
The food and beverage industry depends on superior quality, 100% oil-free compressed air to eliminate the presence of unwanted oil vapour throughout the production line.

Extending the life of hydraulic cylinders and hoses
Hydraulic systems & components
Hose saver protection sleeves extend the life of hydraulic and pneumatic hoses by eliminating unnecessary expenses from downtime, oil loss, contamination, and replacement hoses.

Hydraulic connectors with residual pressure
Editor's Choice Hydraulic systems & components
Hydraulic connections are vital in both outdoor and indoor industrial machinery. However, the hydraulics lines frequently require connecting and disconnecting for maintenance or changeover. The goal is to enable quick, easy swaps to enhance machine flexibility and productivity.

Sun carries the load
Axiom Hydraulics Hydraulic systems & components
When valuable lives are hoisted in the air, reliable load holding technology is at its utmost importance. That’s why you can count on Sun’s excellent load holding cartridge valves.

How to protect against water hammer
SA Gauge Editor's Choice Hydraulic systems & components
Water hammer is a high-pressure surge or wave created by the kinetic energy of moving fluid when it is rapidly forced to stop or change direction, altering the liquid’s velocity. The progression of the water hammer shockwave needs to be detained and slowed before reaching the instrument sensor. SA Gauge manufactures several such devices in order to achieve this.

Axiom ups its game
Axiom Hydraulics Editor's Choice Hydraulic systems & components
In today’s competitive market, manufacturers of hydraulic components are constantly challenged to find better, faster and cheaper ways of producing parts. Axiom Hydraulics has met the challenge, and can now deliver a product with superior performance and significant cost savings for its customers.

Condition monitoring for critical hydraulic equipment
Hydrasales Hydraulic systems & components
Systems maintenance personnel often classify equipment as critical, based solely on its value. Instead, critical equipment should be determined by its importance to the operation and the objectives of the organisation.

Hydraulic bolt tensioning
Bearing Man Group T/A BMG Hydraulic systems & components
BMG’s Nord-Lock bolting solutions include Boltight hydraulic bolt tensioning tools, which can be used to tighten bolts simultaneously, ensuring even preload in industrial applications and extreme environments, ...

How to get the best of both worlds with hydraulics and electric
Editor's Choice Hydraulic systems & components
While battery technologies continue to evolve and overcome challenges that have previously restricted more rapid electrification adoption rates, hybrid electric systems are well positioned as an ideal interim solution.

Getting the drop on moisture and contamination control
Hydrasales Pneumatic systems & components
Studies have shown that contaminated oils are responsible for 70 to 80% of system failures. The two primary causes are particulate and water contamination. The inclusion of in-line filtration or the installation of efficient return-line filters results in cleaner and more efficient systems.