August 26, 2013
It’s Brand New, So It MUST Be Aligned, Right?
By Stan Riddle
During a recent training class at a new facility in Indiana, the class wanted to check alignment of a recently installed circulating pump. Their response was, “It’s brand new, so it must be aligned, right?”. To which I responded, “I’ll bet it isn’t”.
For an 1800 RPM machine the maximum allowable angular misalignment is +/- 0.7 mils per inch and a maximum allowable offset of +/- 4.0 mils in both the vertical and horizontal planes.
The vertical angle is almost 3 times tolerance with the horizontal angle almost 13 times tolerance! The vertical offset is 13 times tolerance and the horizontal offset is 20 times tolerance!
Never trust that a newly delivered machine is aligned. I do not care if it has a tag saying it is. I do not care if the company you purchased it from says it is.
Even on the outside chance it was aligned correctly when it was installed, lots of things can happen between the factory floor and your plant floor.
• Machines can be moved to connect piping, ductwork, etc.
• Bases and piping can cause the alignment to be moved.
• Several hundred miles of hauling the machine down an interstate can change the alignment.
• And their degree of alignment may not match yours.
I recommend aligning machines as soon as they are unloaded from the truck, whenever possible. Not only can you verify the alignment is now “good”, you can correct any bolt bound or base bound problems before any additional components, such as piping and conduit are installed. After all the accessory components are installed, check it again.