You can barely see the wound. A pinhole, a fine mist off a fitting, a jet of oil so thin it looks like nothing. Then a few hours later a bloke's hand is the size of a football and he's in surgery, if he's lucky enough to have gone straight to hospital instead of shrugging it off. That's a high-pressure fluid injection injury, and it's one of the most under-rated dangers in any workshop running hydraulic tooling.
Craig and I are diesel fitters. We've spent years on these tools, and between us we've got stories we'd rather not have. So let's talk plainly about where the risk actually sits, why the usual "fix" only covers half the problem, and what we do about it.
What a fluid injection injury actually does
People hear "it only nicked my finger" and assume it's a scratch. It isn't. It takes as little as 100 psi to punch fluid straight through skin like a hypodermic needle, and these tools run at thousands of psi. The entry point looks harmless, there's often barely any pain at first, and that's exactly what makes it so dangerous: people wait.
Under the skin it's a different story. The fluid tracks deep along tendons and tissue, hydraulic oil and grease are toxic to the body, and the pressure alone can shut down blood flow to the whole hand. It's a surgical emergency. The single biggest factor in whether someone keeps their fingers, or their hand, is how fast they get to a trauma unit and into surgery. Wait it out and you're looking at amputation, or worse.
If it ever happens on your site: treat it as an emergency, get the person to a hospital emergency department immediately, tell them it's a high-pressure injection injury and name the fluid and the pressure. Don't wait for pain, and don't send them to a GP or urgent care.
Burst sleeving on hoses: one answer, but not the whole story
We've all seen burst sleeving pulled over the hoses. It's a good idea in principle, and yes, it's one layer of protection. But watch what actually happens to it in the field:
- It's usually glued in place, and it falls off. Vibration, heat, oil and handling work it loose, and eventually it's sitting in the bottom of the toolbox doing nothing.
- Or it stays on, and now you can't inspect the hose. You've armoured the line, but you've also blinded yourself to the very thing you're supposed to be checking.
And here's the part that gets overlooked: how many failures actually happen out in the middle of the hose, inside that sleeving? Bugger all. You've protected the length of hose that rarely lets go, and left the bits that do wide open.
Where you'll really get bitten
On hydraulic bolting tools, the failures happen at the joints: the crimps, the connection points, and the swivels. That's where the movement is, where the wear is, and where the pressure finds a way out. That is where you'll get bitten when it happens.
So a sleeve running down the safe part of the hose, glued on and out of sight, doesn't do much for you at the exact points most likely to fail. You have to cover the weak points, not just the middle.
Cover the weak points, not just the hose
That's the whole idea behind what we build: a purpose-built cover that goes over the crimps, the fittings and the swivels, which are the actual failure points. If a connection lets go, the release is contained right where it happened instead of straight into someone's hand. The goal is simple: nothing exposed while the tool is under pressure.
Our covers are rated to 11,600 PSI (800 bar), so they're built for the pressures these tools genuinely see, not a token bit of fabric. Every part of the tool that can bite gets covered, and it all links together so there are no gaps left open when the tool's in use.
Built by fitters, made in Mackay
We didn't design these from a catalogue. We designed them because we've dealt with the weak points ourselves, on the tools, over years, so we know exactly where they let go and what a cover has to survive to be worth having.
We've been manufacturing these covers for a long time now, for hydraulic bolting tools, cylinders, grease guns, and all the variant hoses that come with them. They're made right here in Mackay, Queensland.
Let's start a conversation
This should matter to every maintainer, supervisor and manager who has these tools in their workshop. It's a horrific injury, it's largely preventable, and it doesn't get talked about anywhere near enough. If getting this in front of people saves one bloke's hand, it's done its job.
We've got a lot more detail on how the covers are built and how they fit your specific tooling, and we're always happy to talk it through. If you run hydraulic bolting tools and you want to close off the exposed points, get in touch and let's have the conversation.
