bendyone
Well-Known Member
Anyone use one?
Looking to clean my keels back to a rust free surface. What size of compressor do I need?
Looking to clean my keels back to a rust free surface. What size of compressor do I need?
compressor and needle descaler
- Thread starter bendyone
- Start date
rogerdog
Well-Known Member
All down to something called Free Air Delivery capacity of the compressor - usually about 70-100l/m for this style of tool- you can find them with lower consumption - but that means it will tend to be smaller/slower or simerlar - hence take longer
In simple terms at least a 2 to 3 HP compressor for comfort + reasonable size receiver.
And before anyone says that they used theirs on a smaller compressor - yes will do it but not at high duty cycles and with 100% running.
Do they work - yes extremely well - but not as fast as you may expect - work better at removing anything brittle ... um like scale, if you have any form of soft pait there - tend to clog and better to get the paint off first - unless it's become brittle as well!
In simple terms at least a 2 to 3 HP compressor for comfort + reasonable size receiver.
And before anyone says that they used theirs on a smaller compressor - yes will do it but not at high duty cycles and with 100% running.
Do they work - yes extremely well - but not as fast as you may expect - work better at removing anything brittle ... um like scale, if you have any form of soft pait there - tend to clog and better to get the paint off first - unless it's become brittle as well!
steve28
Well-Known Member
about the best choice for this job, i hired one a few years back to do the bilge keels, the hire shop had the whole kit for 18 pounds for the weekend, i picked a bank holiday weekend so i went back on the tuesday.
make sure you have the primer ready as the rust will return quickly on the exposed bare metal
make sure you have the primer ready as the rust will return quickly on the exposed bare metal
DownWest
Well-Known Member
Axminster have a couple. Recommend 6 cu/ft. Bit cheaper is the attachment for an air hammer. Depends on your keel size and or spare time. Air hammer needs 4 cu/ft
A
A
Poignard
Well-Known Member
Any use for removing many layers of old deck paint from a grp deck with anti-slip mouldings?
Malish
Well-Known Member
If you go for a 3 HP motor on a compressor you may find that it trips the yard breaker (he says from past experience..) the supply needs to have a motor rated breaker which can cope with the initial, higher power draw on start-up of the motor. My experience with a random orbital sander with a nominal air consumption of 6 cfm was that a 3hp motor and a 50L tank could barely keep up with the air demand of the sander under contiuous use, so you do need a large motor / tank configuration as rogerdog flags.
pvb
Well-Known Member
Hire companies will usually recommend a 9cfm compressor for an air needle gun. If your power supply won't run this, you could always hire a petrol-driven compressor.
misterg
Well-Known Member
HSS, etc. also do electric needle guns, which might save a lot of hassle with compressors, etc.
Andy
Andy
oldharry
Well-Known Member
Did my keels beautifully with a standard mains needle gun from local Hire Shop. Forget compressed air unless you already have it. It doesnt work any better!
fishermantwo
Well-Known Member
Just make sure you stick to de scaling steel. see note below on Beryllium poisoning. The "Jason" pistol was used by many of us during our time with the grey funnel line. Not everyone survived.
"Defence managing the risks
In terms of managing the risks associated with beryllium, a Defence spokesperson told Inside OHS that a routine occupational hygiene identification survey had found beryllium exposure "required further risk analysis". "Beryllium can be found on board RAN ships as alloys for electrical parts, and as an oxide as a coating on components of some weapons systems," the spokesperson said. "Exposure could occur during maintenance on components."
While "large pieces" of beryllium were "unlikely to be a health risk", beryllium "can enter the body as dust, fume or soluble salts and could pose a health risk", she said. Following the survey, Defence conducted a risk analysis of beryllium and followed up with a risk treatment policy. It included controls, such as signage, and amended emergency procedures "to cover possible exposure due to the combustion of components containing beryllium". The Navy has now assessed the risk as "occasional" and "within acceptable levels". "It is reviewing the risk periodically," she said."
"Defence managing the risks
In terms of managing the risks associated with beryllium, a Defence spokesperson told Inside OHS that a routine occupational hygiene identification survey had found beryllium exposure "required further risk analysis". "Beryllium can be found on board RAN ships as alloys for electrical parts, and as an oxide as a coating on components of some weapons systems," the spokesperson said. "Exposure could occur during maintenance on components."
While "large pieces" of beryllium were "unlikely to be a health risk", beryllium "can enter the body as dust, fume or soluble salts and could pose a health risk", she said. Following the survey, Defence conducted a risk analysis of beryllium and followed up with a risk treatment policy. It included controls, such as signage, and amended emergency procedures "to cover possible exposure due to the combustion of components containing beryllium". The Navy has now assessed the risk as "occasional" and "within acceptable levels". "It is reviewing the risk periodically," she said."
Malish
Well-Known Member
I wasn't aware that Be was a major component of keels, or for that matter anywhere else on your average yacht. As metals go it would be particularly unsuitable for keels due to its low density, let alone its cost.
pvb
Well-Known Member
Why would you want to introduce scare stories about beryllium? It's got nothing to do with keels. You might as well have reminded people that asbestos is dangerous! /forums/images/graemlins/confused.gif
oldharry
Well-Known Member
Using a mask and eye protection is of course basic common sense when derusting with a power tool , but I dont think Beryllium was used much on the Hunter Horizon 26's weapons systems, was it?
Avocet
Well-Known Member
If you're thinking of buying a cheap compressor (of the typical 2 or 3hp single phase type) make sure you go for something with at least twice the Free Air Delivery that you think you need! My experience of them is that they're only rated for (maybe) 50% duty cycle. Blowing the odd car tyre up now and again won't be a problem but give them some real work to do and they don't half get hot!
