ERAG rental from ACQUIP, makes moving the instrument between two adjacent surfaces a breeze.
ERAG / CAT Concentricity Alignment Tool
ERAG Electronic Radial Alignment Gauge
The use the Electronic Radial Alignment Gauge (ERAG) or Concentricity Alignment Tool (CAT) negates the need for tight wire and/or laser alignment. This tool can directly measure the amount of diaphragm misalignment with the rotor in place. These tools have a proven alignment method through thousands of hours of use.
The Electronic Radial Alignment Gauge (ERAG) or Concentricity Alignment Tool (CAT) is very cost effective and can often pay for itself in one outage! This tool is known to be very easy to use and gives you direct readouts.
ERAG/CAT Concentricity Alignment Tool features:
• Directly measures the amount of diaphragm misalignment with the rotor in place.
• Factory and field-tested method of diaphragm alignment since 1992.
• Alignment method proven thru thousands of hours of use.
• Cost effective – often pays for itself in one outage!
• Easy to use – direct readout.
• Accommodates a wide range of turbine sizes.
• Very accurate (resolution to .0001 inch – accuracy plus or minus.0005 inch maximum).
• Durable – units rarely require maintenance even after years of service.
• Parts are readily obtained from the factory and are usually field replaceable.
How the ERAG/CAT will work for my project?
Inserted into the empty packing groove, the Concentricity Alignment Tool (CAT) allows annular space variations to be displayed on a LCD display as it is pulled through the packing groove as shown.
The head “rub bars” ride on the turbine shaft and the head lever arm rides on the ID of the diaphragm. As the head is pulled through the packing groove, the lever arm follows the contour of the diaphragm ID and the dimensional variation is displayed.
Our instruments have a main body to which there is pivotally coupled a U frame whose arms extend at an angle from its base, so that as the former is pivoted in one direction, the latter will correspondingly pivot in an opposite direction.
Contact points are provided to the arms and the bottom surface of the body, and the base of the U frame is biased by a spring-loaded slidable element within the body, which in turn is connected to a transducer.
An ideal way to accomplish alignment is with the rotor in place so the dimension from rotor to seal carrier can be measured directly. One of the best methods of measuring between the rotor and the carrier includes an ERAG.