- 00000018WIA30310870GYZ
- id_400220181.9
- Jul 24, 2022 7:03:27 PM
Secondary magnet rundown
About this task
Important: This secondary quench method should be attempted only after other approved methods of rundown have been attempted and in the event of a life threatening condition. Performing this procedure will take the magnet out of service for at least one month.
| Warning | |
|---|---|
Personal Injury or Equipment Damage. This emergency magnet rundown procedure may create dangerous situations or damage equipment. Perform this emergency magnet rundown procedure only in emergency situations (such as when a person is trapped between a magnetic object and the magnet). In situations where there is no immediate threat, contact your GE Service Representative for non-emergency rundown procedures. | |
- If possible, call your qualified service representative.
- Locate the vacuum break tool (46-260852G3). Note: This tool is for emergency only and should be stored in a safe and easily accessible location. Ensure that all operators are informed of this tool's location.
Figure 1. Vacuum break tool 
- Ensure all room ventilation systems are on and the scan magnet room door is propped open.
- Locate the vacuum port access cover on your magnet cover.
Figure 2. Vacuum port access on the magnet cover 
- Remove the vacuum port access cover from the magnet cover to expose the vacuum port.
- You should be able to remove the access cover with your finger or non-magnetic tool.
Figure 3. Example of an access cover off and the vacuum port exposed 
- You should be able to remove the access cover with your finger or non-magnetic tool.
- Remove the protective dust cover from the vacuum port.
- The magnet cover in this image is shown removed for illustration purposes only.
Figure 4. Dust cover removed 
- The magnet cover in this image is shown removed for illustration purposes only.
- Screw the handle of the vacuum break tool into the plug of the vacuum port by turning it clockwise.
- At least three full turns are required to ensure thread engagement.
- If you are unable to turn the handle, either call a GE service representative for further assistance or remove system enclosure cover.
Figure 5. Vacuum break tool screwed into vacuum port plug 
- Lift the vacuum break tool handle until it is parallel to the floor. Leave the handle in this position.
Figure 6. Vacuum break tool parallel with floor 
- There will be an inrush of air into the magnet and the magnet will quench in about 30 seconds.