There is an extraction device for the removal of the HV stacks from ED1 and ED2, see the associated figure. When not in use one may find this device under ED2. There are 2 seperate setups for ED1 and ED2 but the transer from one setup to the other is quite simple. All terminology used herein is shown in the figure.

Important Notes:

- Peter Machule and Doug Preddy are the experts when the extraction of these HV stacks is needed, if around they should oversee the operation.
- When lifting the extractor with the crane the slider and slider extractor could very easily slide off. Generally a c-clamp is used at one end of the rail and a bolt is left partially screwed at the other end. These should stop the slider from sliding off.

ED1 setup:

- The rail as labelled in the figure on which the stack slides out must be as close to flush with the support assembly as possible. That is the end which is closest to the stack when seen as in the figure. Two to three bolts hold the rail to the support structure.
- The extractor slider labelled "ED1" must be put on the slider. This requires the removal of four bolts. It is best to leave the slider on the rail and remove the bolts as is, then replace (if needed) the extractor slider.

ED2 setup:

- The rail must be two bolt holes foward in order to extract the stack. That is two bolt holes foward with respect to the flush position of ED1. Two to three bolts hold the rail to the support structure.
- The extractor slider labelled "ED2" must be placed on the slider.

Stack Removal:

- First the SF6 must be removed from the HV stack chamber.
-Plumbing must be removed. This is just a copper tube, one of the ends is shown on the figure the other end will of course be at the feed-thru into the blue nylon. There is similar plumbing removal for ED2.
- Next remove two bolts from the outer ring of bolts, these holes will be used to support the extractor frame. Two which are from the upper half and across from one another are good. One should now find two longer bolts to support the extractor.
- It is easiest to use the crane to hoist the extractor into place then screw it on. There are four bolt holes which eyebolts can be used to lift the extractor. The holes furthest down on each side are the best to use since problems arise with the side of ED1 if the inner two most holes are used. One person is needed to operate the crane and a second to guide the extractor into place.
- Once the extractor frame is in place and bolted down one can then remove two of the bolts holding the stack in place. The extractor slider can then be slid in and bolted on. The rest of the bolts holding the stack to ED1/ED2 can now be removed and the stack slid out of place. It may be necessay to remove all lower half bolts before attaching the extractor slider.

Michael Lamey
11 September 2003