Ticket #38 (task)
Opened 13 years ago
Last modified 13 years ago
Complete Buoy Structure Modifications
Status: closed (fixed)
| Reported by: | haines | Assigned to: | haines |
|---|---|---|---|
| Priority: | critical | Milestone: | Buoy-System-2010 |
| Component: | hardware | Version: | |
| Severity: | must have | Keywords: | |
| Cc: |
- contact Jimmy Bircher a local welder to help modify buoy CG
- let Jim Bircher and John Wallinga decide best cost-effective solution
Bircher, Inc to do the following work
- order s/s rods (~500 lbs) for each buoy
- cut and install 4 rods on each buoy
- machine bale key-hole bushing using 4140 steal on one buoy
Jimmy Bircher Bircher Inc Machine Shop 119 Industrial Dr. Moreahead City, NC 28557 bircher@bizec.rr.com 252-726-5470 252-241-5811 (cell) bircherinc.com
Change History
03/30/11 15:46:08: Modified by haines
- status changed from new to assigned.
07/12/11 10:56:37: Modified by haines
- description changed.
07/12/11 11:03:35: Modified by haines
- description changed.
07/12/11 11:16:44: Modified by haines
- priority changed from major to critical.
07/13/11 10:01:53: Modified by haines
- description changed.
07/13/11 10:05:11: Modified by haines
- description changed.
07/13/11 10:06:37: Modified by haines
- description changed.
07/13/11 13:00:45: Modified by haines
Jim went by today. He has some questions for John Wallinga.
His main idea is to add the weight by adding solid s/s rod of comparable weight to Pb-shot filled 4 inch Al tube. He thinks this would be much easier and cleaner. Welding and removing corroded Pb-shot could be really messy and expensive job.
07/14/11 15:06:09: Modified by haines
- description changed.
John Wallinga and Jim Bircher discussed alternative option for significant additional weight to change CG.
Jim's idea is to attach S/S rod. John is okay with this approach. Al-welding and Pb-shot will be a much more costly and time consuming. Jim is ordering the s/s rods (500 lbs) per buoy. He is submitting two invoices, one for each buoy (~$3300 for one, and $3700 for other that needs bale-bushing). Jim's shop crew can do the work at IMS, which means we don't have to take time to transport to Jim's shop. We won't have any paint scraping, either. So retrofit should be done within a couple of weeks.
added to ticket description
- let Jim Bircher and John Wallinga decide best cost-effective solution
- order s/s rods (~500 lbs) for each buoy
- cut and install 4 rods on each buoy
- machine bale key-hole bushing using 4140 steal on one buoy
removed from description:
- remove paint from legs anywhere welding to be done
- drain Pb-shot from legs and retain
- weld 3 inch Al tube (6061T6) between each leg
- refill all legs with retained Pb shot and add new Pb shot to additional tubing
- possible complications
- corrosion on Al parts to disconnect bottom legs from main portion of buoy
- corrosion of Pb shot in legs annealed as solid mass
07/14/11 15:06:55: Modified by haines
- description changed.
08/02/11 09:45:34: Modified by haines
- status changed from assigned to closed.
- resolution set to fixed.
Job completed by Bircher July 28. Nicely done.
Contacted Jimmy Bircher to let him know the buoys have arrived back at IMS. He will need to take a look at the job.