Question 1

Can a hydraulic injection injury kill you?

Accepted Answer

Yes, in severe cases. Death is most often a consequence of systemic infection, sepsis, or untreated necrosis following delayed treatment. Even non-fatal cases carry substantial amputation risk if surgical decompression and debridement are delayed. The medical response standard exists precisely because outcomes deteriorate sharply with time-to-treatment. Any suspected hydraulic injection injury requires immediate emergency care and a hand surgeon — even when the wound looks trivial.

Question 2

At what pressure can hydraulic fluid penetrate skin?

Accepted Answer

Research cited by HSE indicates injection injuries become possible at pressures around 7 bar — approximately 100 psi — and serious injuries are commonly documented at pressures above 100 bar (UK Health and Safety Executive, 2014). Industrial hydraulic systems typically operate at 1,000–5,000 psi, well above the threshold. Penetration at lower pressures is rare but documented. The practical implication: any active hydraulic system should be treated as capable of injection.

Question 3

Do gloves protect against hydraulic injection?

Accepted Answer

No. Industry training literature reports a manufacturer-conducted demonstration in which hydraulic oil at 3,000 psi penetrated welding gloves in roughly 3 of 5 attempts (Construction Equipment magazine). Gloves protect against burns, abrasion, and incidental fluid contact — important hazards in their own right. They do not stop a high-pressure jet. The control that prevents injection injury is the depressurisation procedure, not the PPE.

Question 4

Why does a hydraulic system still have pressure when the pump is off?

Accepted Answer

Accumulators are designed to retain charge after pump shutdown — that is their operating purpose. Vertical cylinders hold loads against gravity through hydraulic locking. Isolated line segments retain whatever pressure was trapped when the valves closed. Each of these is independent of the pump. This is why OSHA 29 CFR 1910.147(d)(5) requires that stored or residual energy be specifically relieved before servicing, not simply that the prime mover be shut down.

Question 5

How often should hydraulic hoses be replaced?

Accepted Answer

There is no single calendar answer. SAE references rubber-hose service life of approximately ten years from manufacture, but most active industrial applications recommend replacement at 1–2 years depending on operating conditions. Replacement triggers override calendar intervals: visible cover cracking, exposed reinforcement, kinks, fluid seepage at fittings, or operation outside the rated bend radius all require immediate replacement regardless of age. ISO/TS 17165-2:2018 provides the global reference.

Question 6

What is the difference between cavitation and aeration in a hydraulic pump?

Accepted Answer

Cavitation forms vapor cavities when local pressure in the suction line drops below the fluid's vapor pressure — typically caused by a suction-side restriction such as a clogged filter or low NPSHA. Aeration introduces external air into the fluid through a defective seal or low reservoir level. Both damage pumps and produce noise, but the diagnostic signatures differ: cavitation whines at high pitch, aeration knocks like marbles, and aeration produces visible foam in the reservoir. Cavitation does not.

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