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Originally posted by Bob C.
I realize I am stepping on thin ice here and others with more expereince can add their 5 cents.......
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Or 5p as the case might be.
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I have already learned a lot from this string on the safety side and after hearing Rob Clarke story today about an old rubber hose bursting when jammed with wet sand.... being slapped by a piece of the hose.... showered with sand... I can understand and fully agree that big jobs are better left to the professional sandblasters.
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There are many dangers, I'm lucky being the business owner and operator in a remote location, then: I can kill myself and our HSE can't tell me what to do; and I can make a bit of external dust. Hose whip-checks would be mandatory for an employee and we have had both a 3/4" compressor line burst and the 12bar rated blast hose go through.
Let alone wet sand, you dare not leave chilled iron grit in the pot overnight in the winter, any water or dampness and its a rusty lump of immobile crud that needs hours of manual cleaning. Pot blow-down last thing is vital.
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Even small jobs need to be done with the utmost attention to the health issue...... I realized today why all the cheap sandblasting quote I obtained came from rural areas... it seems that within the city limits of Ottawa you need a permit to sand blast outside.....
and I am sure other large cities have the same limitations....remember ......" Sorry officer I didn't know.." will not stand up in court.
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You do only have one life, sand is dangerous, crushed glass is a better bet and safer.
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amount of amps being drawn.... and most importantly the CFM ratings....(and Yes they all tend to be exagerated based on ideal conditions) and the most air comsuming tool that you will be using... the sandblaster being the most air cfm hungry.
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As far as I can ascertain the world standard for electric compressors designed for the home market and lighter use ALWAYS quote the cfm ratings as free air - this is what the compressor shifts and is not by any stretch of the imagination the capacity at the working pressure.
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Jordan has to keep in mind how much power he can draw from his service panel....... I have 200amps in the barn and the 10hp draws 60amps at startups......
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In England when requesting an electric service we need to define motor loads separately so the authority can fit the appropriate size feeder cable and ensure other users don't get a huge dip in volts when the motor(s) start. Any motor takes a huge gulp of power to begin turning and you can reckon on at least 4 times the full load rated current, the supply and cabling needs to be commensurate.
R.