Brookhaven National Laboratory

Minutes, LEReC High Energy Extraction Meeting

2017-03-24

High Power Beam Dump Shielding – Installation using Gantry Crane –

Discussed as follows:

Statements:

·  Install Base, Dump, and Gantry Crane first. Doghouses and Back Shielding could then be installed during / after Extraction Line. Gantry crane will be only method to remove shielding.

·  Gantry crane will have V-groove casters and removable tracks will be installed on floor.

·  Shielding may be removed in sections using gantry crane and two chain hoists then placing pieces on skates in area on floor behind dump.

Question: Is using two lift hoists on carriages under one I-beam allowed?
Answer: Not sure, may need to check with M. Gaffney.

·  Gantry crane will be disassembled and “inner” leg removed, I-Beam hung from unistrut of RHIC tunnel or removed, and “outer” leg removed or positioned in a location out of worker’s way.

Question: Can “trapped” gantry leg be left between injection line and RHIC?
Answer: Probably not. It may be possible to move it closer to IR where there may be open beam line, but best to try and remove it.

Question: Can gantry be built with legs that can be broken down or disassembled?
Answer: Not sure, will check with vendors.

·  Gantry I-beam and / or “trapped” leg could be completely removed by using several pick points secured to the RHIC tunnel unistrut or a separate ½ ton beam secured to RHIC tunnel unistrut.

Question: Any issues with either suggestion?
Answer: 1) Pick points would need to be analyzed for bending due to lateral loads. 2) Separate beam with carriage would be considered a crane and need to be inspected. *** Best to support I-beam with steel wire and turnbuckles (1/2 inch lift) to allow legs to be removed.

Other Discussion:

Questions:

1)  Can shielding be rolled on pin rollers onto a die table and removed that way?
Answer: Rollers and die table could be used, but downstream shielding still needs to be removed first.

2)  Can profile monitor in injection line be rotated 90 degrees s it does not stick into aisle?
Answer: Probably. Check with Instrumentation and Vacuum groups.

3)  Can water lines be routed so they don’t pass to outside or RHIC?
Answer: Yes. Will run water lines down and then forward along underside of shielding base. Once clear of dump base, water lines will rise to point above horizontal unistrut, and then run horizontal toward IP. This will keep water lines clear of gantry crane. PVC (high voltage) section will be limited to under the Beam Dump. Keeping water lines against underside of dump base will still allow access to RHIC high voltage lines.

-  Action Items:

o  J. Fite – Determine if using two carriage hoists or D-rings on one I-beam is allowed..

o  J. Fite – Determine if an area between injection line and RHIC exists for storage of “trapped” leg if removed from gantry.

o  J. Fite – Determine and source a gantry crane with v-groove casters, and legs that can be disassembled to aid installation / removal from RHIC ring.

o  J. Fite – Determine lifting load and safety factor to store/hang gantry I-beam from RHIC tunnel unistrut via wire rope.

o  J. Fite – Determine if profile monitor in injection line can be rotated 90 so it does not protrude into aisle. If possible to be rotated, then contact appropriate designer to change model.

o  G. Whitbeck – Reroute water lines as described above.

o  G. Whitbeck – Finish drawings for shielding modifications

o  J. Fite – Develop Installation schedule.

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