Diesel vs electric compressor running costs

[brightspark]

I am looking at a 130cfm 22kw Hydrovane to run a blast pot for my blasting room. I am unsure what would workout cheaper.

To buy a road compressor or run such a big motor from the hydrovane.

Whats your thoughts, was hoping to run a 6mm nozzle for prepping wheels.

thanks for the replies, thats a good point on nozzle sizing. I was looking at nozzle sizes and had 6mm in my head when i was bidding on an 18kw hydrovane. Suppose the 8mm would be a good step up in production times, more worried about passing so much media through in a small blast room... lets hope my extractor is up to the job lol.

depends on how big your room is. are you talking about walk in and just doing wheels and motorbike frames etc and using an airfed helmet and where are you exhausting the dust to if your shoving 90cfm in you need to extract 90cfm of free air back out otherwise it will pressurise I just used to do wheels and frames in a shed outside with the walls and floor lined with conveyor belt just leave the door open and the crap just blew away

 

[mtt.tr]

That's the way I thought it worked, it would have left the rest of the place short. When everything in this place is in full swing the fly cutter on the mill makes the lights flicker, the compressor would kill it.

Bob

Should be though this isnt allowing for power factor 65/sqrt3.

Probably nearer 36a a phase

 

[mtt.tr]

That's the way I thought it worked, it would have left the rest of the place short. When everything in this place is in full swing the fly cutter on the mill makes the lights flicker, the compressor would kill it.

Bob

That sounds like you are suffering a considerable voltage drop, to smaller cca cable

 

[andy82]

exactly just wheels and frames.. suppose anything that will fit in my oven. I had planned to build a 3m x 2m room enough to walk in and place 4 wheels on a bench and blast the lot. extraction not sure yet i have a large 1.1kw 3 phase extractor fan and was going to rig this up to some type of cyclone system or vent it outside with pre filters. air fed i was going to rig up a large hose straight from a blower i have that would be located outside the room thats sealed inside a filter box, this will be going to a mask that i have that was a battery powered air mask.

 

[8ob]

That sounds like you are suffering a considerable voltage drop, to smaller cca cable

Possibly, cable the leccy company installed is about 2" in diameter and its about 400mts long. May well be too long a run

Bob

 

[andy82]

Also having never blasted at those type of levels, i use a 3mm at the moment to clean up after acid dipping. How efficient is 8mm in removing powder coat any way to cut down on acid dipping times or perhaps remove it would be fantastic, i hate that stuff. At the moment i am around 45 mins in the tank 2 wheels at time and anything to speed up the stripping process is a bonus.

 

[mtt.tr]

Possibly, cable the leccy company installed is about 2" in diameter and its about 400mts long. May well be too long a run

Bob

Stick a multi meter on and have the power switch on shouldn't drop more than 5%. What the arrangement passed the incomer what size cable have you run from the meter to the shed?

If its more than 5% due to the power board not your own install i would be on the phone to get an uprated cable

 

[brightspark]

depends on what media you are using to the cutting power I only use expendable copper slag on the larger pot and bin it after 2 uses the 3mm pot I use kiln dried sand in it steel wheels aren't a problem for both but if your doing ally wheels it will knock hell out of them if your not dipping them 1st and just tidying them up. realy u need reusable abrasive or u can get crushed glass cheap by the pallet load single use and chuck it

 

[brightspark]

minimum supply voltage sould be no lower than 216 volt under full load

 

[andy82]

working out the amp for say the 22kw hydrovane, would it be worked out by using the following 22000w / 240v divided over the 3 phases so around 30a

 

[sako243]

@8ob 2" seems a bit undersized especially if it's armoured - the lab I did some work in up in Battersea has 400A and that was approx 6" in diameter (armoured) and a dedicated feed from the sub-station. That was an expensive bill tunneling through half of Battersea to install the cable...

I ask Dai when he comes back what it costs to run his road compressor, it's a little bigger than what you're looking at (but then again he takes on much bigger blasting jobs). Not the best photo but the compressor is on the trailer to the left and he's got something like 2" bore pipes direct from the blast pot to the wand. He said the compressor is only a baby compared to his previous one but keeps up (new one is 265cfm, old was over 360cfm).

This was him seeing how difficult the paint was going to be to get off.

 

[daleyd]

It would be nearer 37-39 amps I’d say, depending on your incoming voltage. There will be an efficiency factor to add to the calcs. Here’s the table from my trusty klockner moeller reference guide (for 400v so you can prob knock a couple of amps off for typical 415 supply) but there are loads of online calculators you can use.

 

[andy82]

Thanks very much for posting that. thats very handy will screenshot that.

 

[daleyd]

Thanks very much for posting that. thats very handy will screenshot that.

It’s a great little reference book, had it off a K-M rep about 20 years ago and I still use it regularly.