[TheForge] Sand blaster problem: hose blows off

[Ries Niemi]

A siphon gun works the same way, its just that the T is inside the gun. The air hose comes in the back of the gun, like yours comes into the T, and the hose from the bottom of the T goes to the sand pile. The third leg of the T is the nozzle.
What you have is called a pressure pot, where the air pressurizes the tank full of sand. Thus, the air sand mixture travels much farther on yours, from the tank to the gun. This, of course, leaves more room for leaks, and, since yours uses friction fits rather than pipe fittings, it can come apart.
Basically, your problem is cheapness.
You could braze a pipe fitting on the gun, and another on the T and then use an air hose with threaded fittings- that would be a final fix. 
or, better hose clamps and new hose.

ries

On Jul 21, 2013, at 9:45 PM, Mike Spencer wrote:

> 
> Ries wrote:
> 
> ries> I have a sandblaster and the hose just is a slip fit, and it
> ries> never comes off- but mine is a siphon- so the air hose is a pipe
> ries> thread, and the sand hose has no pressure to speak of.
> 
> So how does that work?  No pressure in the sand hose sounds good.
> 
>> Sounds like yours is some other variety, which tries to do
>> everything with one hose?
> 
>   + Tank, maybe 10 gal, bowl bottom, on end, on wheels. Sand goes in
>     the tank.
> 
>   + Valve #1 pressurizes the tank, seals the fill port.
> 
>   + Tee under the tank; stem of tee connects to bottom of tank via ball
>     valve #3. 
> 
>   + Air delivered to one arm of tee via ball valve #2.
> 
>   + Blast hose connects to other arm of tee.
> 
> Open valve #1 to pressurize the tank.  Open valve #2 to pressurize the
> blast hose.  Open valve #3 (maybe only partly to restrict sand flow).
> Stem and one arm of tee are at the same pressure but the flow from the
> arm does the Bernoulli thing and sucks the sand into the blast hose.
> 
> So how does the siphon deal work?  I'm not married to this gadget,
> open for good ideas, safety, simplicity, ease of use etc.
> 
> Dan wrote:
> 
> dan> Try cutting off 100 or so mm to get a good section of hose. The
> dan> inner side of the hose should be a force fit on the barbs.  Use a
> dan> screw type hose clamp and tighten until you see a slight
> dan> distortion in the rubber as in it is starting to come through the
> dan> slots. I have has to do this to my hf sand blaster to keep the
> dan> hose on.
> 
> Huh. I'd have thought the wire clamp would be better, more localized
> squidge (technical term :-) into the nipple barbs.  Maybe not.
> 
> I'll try that if getting some kind of threaded fittings put on the
> hose turns into a giant PITA.
> 
> ries> TP is the place to get cheap sandblaster parts and pieces. But
> ries> you gotta use that newfangled thing- the internet, and have it
> ries> delivered.
> 
> I was probably the first blacksmith on the internet but I don't do
> on-line shopping. [1] 
> 
> ries> Or just try to find Canadian equivalents- but if Nova Scotia is
> ries> anything like where I live, NOBODY stocks anything locally
> ries> anymore.
> 
> In my nearby market town, not only don't they stock it, they've never
> heard of it. :-) In Halifax there's a huge industrial park and a lot
> of stuff in stock.  But it's an onerous, not to say tedious and
> tiring, task to find the niche biz that does, in fact, have what you
> need. E.g. I'a assured that somebody has stickum-backed abrasive disks
> for my old disk/belt sander.  I'll be shpxrq if I can find them, eben
> with directions.
> 
> 
> I'll try the local big-truck place first.  Maybe they can fix me up
> with high-pressure threaded fittings and I can modify the
> (nonstandard) tee-widget to match.  The gun [2] already has a threaded
> port.  Princess Auto (Canadian version of Harbor Freight) after that.
> They fixed me up with a custom hydraulic hose to connect my
> (vibrating) air compressor to a (very stationary) tank.
> 
> 
> 
> Tnx,
> - Mike
> 
> [1] Never say never. :-)
> 
> [2] Gun? Actually, a very clumsy nozzle affair.  A gun with a trigger
>    would be much nicer.  I should look into that after you explain
>    how "siphon" works.
> 
> -- 
> Michael Spencer                  Nova Scotia, Canada       .~. 
>                                                           /V\ 
> mspencer at tallships.ca                                     /( )\
> http://home.tallships.ca/mspencer/                        ^^-^^
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