I bought a pressure transducer which measures up to 6000psi. The plan is (was?) to fit this to my bottle jack which I reckoned produced about 6000psi at its working limit.
I have since (coincidentally) seen a post on Reddit which led me down the rabbit hole of hydraulic fluid injuries. These are caused by very high-pressure fluid jets from failures of hydraulically-powered machinery. They cause incisions, in the first instance, and cell necrosis afterwards as the oil blocks up all the blood vessels and gangrene ensues.
I am not going to post photos here: they are gross. Google hydraulic fluid injuries or look at this report from the UK Health & Safety Executive. The report’s upper limit is 100bar (1450psi). The results are not at all pretty.
The AGAINST argument:
- I am inevitably going to try and test my jack to its upper working limit, and (given my welding abilities) there is inevitably going to be a pinhole resulting in a 6000psi death-jet.
- I recently sliced a tendon in my hand with a chisel and I am now wondering if frivolous ‘playing around’ with 6000 psi might not be such a great idea.
The FOR argument:
- Its a 6-tonne bottle jack. Where on earth am I realistically going to find 6 tonnes to lift? The heaviest things I have are my car and my house. My car is 1.5T at a push – you would only put half that into the jack.
- Manually cranking load into bottle jack is a slow process so ‘failure’ would be gradual (maybe???). And as soon as a failure occurs the pressure drops off (quickly???)
Well. Its 2-2. I am going to think about it.
I once cut the end of my toe nearly-off with a water blaster. I was stripping paint off something and holding the thing still under my barefoot. I was in my teens.
I recall it being like a knife through butter.
The residential electric variety of water blaster (It was my dad’s, about 25 years ago. He was a bit of a trendsetter) seems to max out at 2000-3000psi….so the ‘gradual fail’ and ‘quick pressure dropoff’ may not be ‘gradual’ or ‘quick’ enough.