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Modifying compressor tank top plate?

csmitty

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So I got bare 80gal tank of CL for a nice deal. However, its newer so its not that long of a top plate (for these over rated small pumps and motors) I plan to add full 7.5hp motor and Dresser pump. So I'm not going to have enough room. My thought was to get a piece of steel bent up to the same shape as the top plate and **** weld it to the end and maybe brace if need be. Since I'm not welding directly to the tank I feel as though it shouldn't be an issue.

The other option I was thinking of was basically sleeveing the top plate. Taking another piece of channel and going over top the old one and either welding/bolting it to the old top plate to get the length I need. This would also help with keeping the center of gravity in the middle.

Anyone done anything like this before?
 
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Murphy4570

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As long as you don't weld to the pressure vessel itself, you can do whatever you want and still be safe. Welding on extra end pieces would probably be easiest. That way you can just elongate one side, drill and tap holes to bolt down the pump, and still have the other end with slotted holes to adjust the motor properly.
 

zkling

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Also keep balance in mind. Most properly matched compressor and motor sets are pretty close weight wise but just something to keep in mind.
 

404

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How about keeping the tank and pump/motor separate. With 2 smaller units, it might be possible to make better use of the space they need. Have a copper line connecting the two. This will cool the air and aid in moisture drop out.

The pump/motor might go in a place where the noise is less of a problem.
 

shoot summ

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I did something similar recently when I replaced my pump.

The mongo pump I purchased would fit length wise, but the top plate was lacking width so I added a piece of angle to the plate for the extra width. As long as you are welding on the plate, and not the vessel I wouldn't think there would be an issue.
 
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csmitty

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Thanks guys. Yes its just limited to the top plate, and away from the tank welds and will make sure not to over heat and do a few sections and let it cool.

I'd like to just weld one side but if its going to cause it to be to cantilevered I can do one on the other side to keep the CG in the middle.
 

CanyonRider

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Not exactly the same thing, but when my old tank rusted out, I cut the mounting plate off it and welded it on top of the plate on the new tank. Everything bolted right back up as before.

IMG_5297-M.jpg


CR
 
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csmitty

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Here's the tank.
69b930f70c5a9e30eba1c836276ec763.jpg

Sorry for the quality. Had to crop an existing pic.

And this is the pump.
f939adbae6806dc85d1c4c4e096c219c.jpg


Still need to get a motor on there as well. Top plate is 25" long and 12" wide.
 

rsanter

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how about mount the compressor pump to the existing plate.
Then install the motor hanging over the edge on an adjusting pivoting plate. Install a bracket from the plate or the pump to hold the tension on the motor. With the weight of the pump on the plate I don't think the motor hanging over will cause a problem. If it does then bolt the compressor down

The other option I like is mount the motor and pump separate. You can put them under a bench or in an enclosure or something. Then put the tank outside

Bob
 

MacMcMacmac

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Whoa! That's a heavy compressor for a vertical. Make sure the tank is very secure. Congrats on that Dresser. You won't find anything better, even a Quincy QR.
 
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Todd.Brock

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That's a lot of pump, what 250 lb? Be sure the new top plate is stout enough. There was a compressor assembled from parts done here. frankenpressor, maybe? Been a few years but they added a few plate extensions to the side for the motor. Good luck!
 

zkling

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What I did and what I would do in your shoes. Mount the tank on a shelf up on the wall ~4'. Then build a skid for the compressor/motor assembly a foot or so off the ground. Just make sure you have a drop leg between the compressor and tank so moisture won't run back down into the exhaust valves.
 
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csmitty

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how about mount the compressor pump to the existing plate.
Then install the motor hanging over the edge on an adjusting pivoting plate. Install a bracket from the plate or the pump to hold the tension on the motor. With the weight of the pump on the plate I don't think the motor hanging over will cause a problem. If it does then bolt the compressor down

The other option I like is mount the motor and pump separate. You can put them under a bench or in an enclosure or something. Then put the tank outside

Bob

I do like that idea. However instead of a pivoting bracket (i'm picturing old alternator) I would do a sliding setup with a bolt to add tension to the belt/s.

Unfortunately tank outside won't work. Well, I was ok with it. Wife not so much. Here's the original tank. Was a 120gal.
JimAJEJl.jpg


Whoa! That's a heavy compressor for a vertical. Make sure the tank is very secure. Congrats on that Dresser. You won't find anything better, even a Quincy QR.

Yea, its pretty massive. The vertical sections on the top plate are 5" and its 3/16 I believe. I need to verify that. I should just model it out and run some fea on it. Looking forward to it though. Haven't heard a bad thing on that pump.

You have 2 pumps?:bowdown::bowdown::rocker:

Was a package deal. The ad listed the extra compressor but was a bad pic. When he said the plate read 660A my eyes got real big. The other is a Kellogg 452. As long as the Dresser is ok I'll resell that Kellogg since dad didn't want it. Guess he's fine with his 3hp Northern Tool. :dunno: He doesn't appreciate the old iron.

That's a lot of pump, what 250 lb? Be sure the new top plate is stout enough. There was a compressor assembled from parts done here. frankenpressor, maybe? Been a few years but they added a few plate extensions to the side for the motor. Good luck!

The data sheet lists 270lbs. Not sure if that includes a pulley. I sure as hell can't pick it up though. I'll have to do a better search. I think I can get it setup to support and balance the weight ok. Just not sure what kind of reaction force its going to put out when it starts running.

What I did and what I would do in your shoes. Mount the tank on a shelf up on the wall ~4'. Then build a skid for the compressor/motor assembly a foot or so off the ground. Just make sure you have a drop leg between the compressor and tank so moisture won't run back down into the exhaust valves.

That would have to be a pretty decent shelf. Especially in a garage. If I went that route I'd rather add a shelf above the tank for the motor and pump. It'd be nice to keep all the belts and pulleys away from stuff that could get in them.

I'm kind of leaning towards adding a new top plate on top of the existing. Essentially taking the inverted C channel and placing a larger length over it to sleeve it in a way. Then can weld to the existing top plate. It might mean I have to run a bolt through two plates to mount the pump but longer bolts could fix that. That would help beef up the strength and allow me to fine tune the position of everything for the best weight balance. The motor i'm looking at is 134lbs.
 

MoonRise

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270 lb compressor + 135 lb motor = 400+ lbs

Mount the compressor pump and motor off someplace else.

IMNSHO putting that much weight up on top of a vertical tank is just asking for all sorts of 'problems'.

Although your original idea of modifying the existing bracket/platform on the tank didn't sound 'bad' at first, the details of 400+ lbs stuck on top of the tank doesn't sound so good to me. Bad CG location, all that moving mass (vibration from pump mostly), the inertia 'kick' when the motor and pump start moving and when they stop moving, etc don't inspire a warm and fuzzy feeling.

Put that big pump and the big motor off someplace else for No-Worries on the tank. IMSNHO.
 

zkling

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That would have to be a pretty decent shelf. Especially in a garage. If I went that route I'd rather add a shelf above the tank for the motor and pump. It'd be nice to keep all the belts and pulleys away from stuff that could get in them.

Not really, a 60gal tank is only ~135lb range. And since it will be vibration isolated from the motor and pump, you won't have to worry about that impacting the structure. Putting the pump and motor on a shelf would be MUCH more difficult unless you used some type of pallet racking. Even then there are lots of things that need to be taken into consideration.
 

bcvickers

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I'm in the skid-mounting the compressor club, and sticking it under a lower shelf or a workbench somewhere at ground level. Makes maintenance easier and negates any weight/strength concerns.
 
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csmitty

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Unfortunantly, space is at a big premium. I've got 353 sqft to work with. If tank mounting becomes an issue. I would probably get some tubing and build a floor mounted stand over the tank for the assembly to live on.
 
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csmitty

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Well its been a while but slowly making some progress. I decided to go with the top plate cap, 1/4" thick plate. A family friend helped me out with a replacement top plate. Just sent him a drawing and I slipped it on for a test fit yesterday. Nice and snug. I left the vertical legs a bit shorter than the original to give me something to weld to, in hindsight I probably could have made it longer and welded on the inside to make it cleaner looking but oh well. I had the holes spec'd in the drawing but the ones for the motor plate were to close to the bend to cut them pre-bending so they didn't do any of the other holes either. So with some drilling hopefully everything can start to get mounted up and plumbed.

I made a CAD model of the plate and added in the motor and compressor and how I have it now the static torque from each should cancel out. Running I'm not sure how it will fare but I can always adjust and modify if need be.

Ho0OsJfl.jpg


Not centered in the pic.
 
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