Back in January of 2019, Brennan began the construction and remodel of our Corporate facility in Solon, OH. What was once a small, single facility back in 1953 is now one of many facilities across the globe.
The design of hydraulic systems for heavy equipment and other machinery must take into account how and where the system is to be used. In accordance with ISO 14121-1, a risk assessment must be conducted to ensure there are not any predictable risks in the design that could carry over into the field. Reasonably foreseeable misuse shall not cause hazards. If any portion of the design is unable to foresee potential risks in the field, then safeguards and warnings must be integrated into the system following safety standards as identified in ISO 12100. As further precaution, ISO 13849-1 is used in the design of control systems.
Along with hose, tube and pipe conductors every hydraulic system incorporates a series of fittings, and often flanges, to connect the conductors to actuators, pumps, valves and other components. Because of the need for system maintenance, removable fittings are required, except for certain specialized systems.
Sizing case drain lines. Typically, hydraulic motors and pumps have hoses that run to a case drain in order to drain excess internal oil from the motor. Having a case drain usually requires running motors in series to avoid damage. If the case drain line is undersized on a hydraulic pump (piston) it can cause the pressure in the case to be too high. As the pump’s life depreciates its volumetric efficiency will decrease, which in turn will increase leakage from the case drain line. If there is extreme case pressure it can cause the piston shoe to lift off the swash plate. This will cause damage that will force the pump to stop working. Go by the case drain port size or up-size it. It is important to make sure the case pressure is below the max rating, which if necessary, can be adjusted at the case drain port size, or increase the size of the port. Case pressure can also become too high at:
Selecting the correct inside diameter of fluid piping, such as steel tubing, steel pipes and hydraulic hoses
Piping should be sized to avoid drops in pressure. Unstable flow causes unnecessary friction between the walls of the piping and the fluid, ultimately creating lost energy in the system which will raise the temperature of the fluid. This is due to excessive fluid velocity which causes turbulence and unplanned pressure drops. By maintaining a practical fluid velocity, pump inlet conditions will be controlled which will reduce the potential of excessive heat.
Hydraulic systems in heavy equipment are designed utilizing certain principles for performing work using multiple components. For instance, motors activate pumps; the pumps pressurize hydraulic fluid that passes through tubes to actuators. As an example, the actuators in an excavator move the arm or bucket. The fluid passes through filters, is recycled through the system, and circulates back to the pump.
Lockout and Tagout Safety Procedures
LOTO, or lockout and tagout, is the most relied upon procedure for maintenance safety. According to OSHA, "Lockout/tagout refers to specific practices and procedures to safeguard employees from the unexpected energization or startup of machinery and equipment, or the release of hazardous energy during service or maintenance activities.
In January of 2019, Brennan broke ground on the new Global Headquarters facility in Solon, OH. Since then, much progress has been made and completion is nearing quickly. While many external and cosmetic changes have been made, there has also been internal change with a shift toward creating a more sustainable workspace.
System components should be inspected during preventative maintenance to address any anticipated issue before failure occurs. Ideally the need for corrective maintenance can be identified and addressed during PM or in preparation for a scheduled or planned shutdown. Be sure any repair of components is performed properly. If not, issues may arise that can cause even greater harm.
Preventative maintenance (PM) of a hydraulic system is a crucial function to maintaining the service life of equipment, reducing costs associated with unplanned equipment shutdown and the safety of personnel.
One the most important considerations in a PM plan is addressing stored hydraulic energy, such as a pressurized hydraulic reservoir. Pressure must be released from the reservoir before replacing a fitting, hose or any other maintenance procedure.