[FastDave]

Be sure to use some type of vibration dampener between the compressor and the concrete. All air compressors create vibration. If a rubber or other type of dampener is not used it can possibly cause the frame to crack where the compressor pump or motor is mounted or even where the frame is mounted to the tank (especially on lesser expensive compressors). I've seen it happen. Most air compressors are shipped on a pallet type support and if this support tends to "walk" when the compressor is running it is the result of vibration.