A webinar presented by the International Fluid Power Society on the prevention and management of fluid injection injuries cites a study by Snarski and Birkhahn, two emergency department doctors at the New York Methodist Hospital. And it contains some sobering statistics:
Fluid injection injuries are relatively rare with around 600 incidences in North America per year. That’s the good news. The bad news is it means your average emergency department doctor may not recognize the seriousness of the situation.
High-pressure grease guns/systems account for 57% of injection injuries. Paint, hydraulic oil and similar fluids account for 18%. And diesel fuel injectors 14%.… continue reading »
While doing some fact checking for a consulting job, I had cause to review Australian Standard AS 2671-2002; Hydraulic Fluid Power-General Requirements for Systems. This Australian Standard is basically the International Standard, ISO 4413 with some amendments based on the local advisory committee’s input.
One of these amendments has to do with pump suction strainers. Section 8.3.3 of ISO 4413:2010, states: Unless agreed between the purchaser and supplier, filtration on pump suction lines shall not be used. Inlet screens or suction strainers are acceptable.
HOWEVER, AS 2671 replaces the above text with: Unless agreed between the purchaser and supplier, filtration, inlet screens or strainers on pump suction lines shall not be used.… continue reading »
One of the advantages of variable-displacement pumps with hydraulic or electro-hydraulic displacement control, or load-sensing control, is their low standby pressure. Meaning, when pump output isn’t required, the pump ‘stands by’ at a relatively low pressure, and usually at zero flow (other than that necessary for the make-up of internal leakage).
From an efficiency (heat-load) perspective, the lower this standby pressure is, the better. Because leakage within the pump is a pressure drop and a pressure drop without useful work generates heat. This links back to the reason for having a low standby pressure in the first place.
But how low can you go?… continue reading »