Georgia Crane Rental – SS Crane and Rigging Corporation Crane Rental Calhoun GA - North Georgia Crane Service


    

Archive for January, 2009

What Size Crane Do I Need to Rent?

crane rental prefab

A crane load rating in ‘tons’ is an ultimate test load used to roughly classify or ‘group’ machines.

For example: A new 100 ton crane has been tested by the manufacturer to lift the 200,000 lbs at an 8 foot radius. This doesn’t tell you a whole lot about how much it’ll pick out there over the roof of the hospital.

That same 100 ton crane will only lift about 10,000 lbs if you have to place the load, let’s say, on a four story building, sixty feet back from the edge of the roof.

The important thing to remember, for your pocketbook, is that if you change any of three critical parameters, you change the crane requirements. A quick example: You can place that 10,000 lb load on that four story building with a 40 ton crane all day long if the load only has to go 20′ back from the edge of the roof.

As you can see, changing one critical parameter made the difference from a $3000.00 crane bill to a $500.00 bill…$2500.00 stays in your pocket because of one ‘little’ measurement!

For crane rentals in Atlanta give us a call at 678-848-6386. Our operators can tell you exactly how much the crane will safely lift for you.

Here’s what we’ll need to know:

1) You have a fairly level solid place to set up your crane with outriggers extended.

2) Where the aerial obstructions are. Booms are fairly straight so there needs to be a clear operating area at least 40′ high extending from your set-up site to around 30′ above your load placement spot. The edge of a building is a typical obstruction. Carefully measure in three places: (1) Feet from the edge of the building to the center of the spot where the load is to be set in place; (2) Feet from the edge of the crane setup area to the wall of the building, and; (3) Feet from the ground level of the setup area to the top edge of the building that the boom must clear. These critical measurements take about five minutes at the job site and/or can often be done from the drawings.

3) How much the load you are lifting weighs! We work just as well with pounds or kilograms.

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Load Radius

A radius is just a straight line measurement…from the very center of any circle to the outside edge of that same circle.

Long boom crane lifting materials

With respect to cranes, the load radius is the horizontal distance from the center of rotation of the crane to the center of gravity of the load being lifted. The load radius is a critical consideration when determining what size crane is required for most lifts. A five foot increase in reach required can easily mean a ten thousand pound reduction in capacity.

Horizontal is another term for level in crane talk. Horizontal measurements are made with the tape measure stretched flat and level (along the ground, or a roof top, for instance) and measuring to the nearest foot is usually good.

The center of rotation is a plumb line passing through the exact center of the crane turntable or swing gear. If you hold a plumb bob over the center of the swing gear, the string would be the center of rotation.

It might have to be a long string. If we want to know the load radius to set an air conditioner out in the middle of a roof, we need to know the horizontal measurement. If the building has a 45′ eave height, we’d need to start a good 40′ directly above the exact center of the crane turntable, a 41′ plumb string would be in order! Obviously, in the real world, its a lot easier to measure to something that is already plumb, like the wall, and then go up on the roof and measure from the eave on across the roof to where the unit center will be. Adding these two measurements will furnish the appropriate load radius.

The center of gravity is just a term for the very middle of the weight of the load. This is not always the tape measured middle of the unit.

If the load is a bundle of 12 foot long 2X4s then the center of gravity (c.g.) is indeed pretty close to 6′ from one the end and about half way across the bundle. If the load is a 50′ steel wide flange beam, the c.g. is pretty much exactly 25′ from the end, go ahead and choke it right there. Most rooftop HVAC units, on the other hand, have heavier internal components concentrated toward one end/side or the other. You can’t accurately determine the c.g. of most HVAC units with a tape measure.

The exact location of the c.g. notwithstanding, if you are so close to overloading your crane that one or two feet internal weight distribution makes a difference, it is usually best to move the crane closer to the load destination.

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Crane Rentals in Marietta Ga

SS Crane & Rigging has three 40 ton cranes dispatched from our Cartersville yard…meaning we can send a crane down I-75 with little traffic interference, hitting most Marietta locations in 30 minutes or less. Let us put a dent in your crane travel time expenses… Call 678-848-6386 for your next lift. One pick or all day, we’re here to save you money!

SS Crane & Rigging…the home of the Three Hour Minimum!!

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Marietta, GA Crane Rental Service

For a responsive crane rental service in Marietta, Kennesaw, Acworth, or Canton… call SS Crane & Rigging at 678-848-6386.

We have lifted a little of everything in North Georgia for over 25 years, currently have three nice 40 ton cranes available, and we’d like to do your lifting in the greater Atlanta area!

As an old-fashioned, get it done kind of company, we don’t have salesman for you to pay- just cranes, operators, and riggers. That way we can offer that 4 hour minimum year round…

We’ve only got a few thousand customers but we know them, and we do our best to make every lift easy for their crew, every time! Next time you need a crane in the North Georgia area (including Acworth, Kennesaw, Marietta, and Canton) give us a try, let us get to know your crew!

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