Dick Loveless 20 January 2010 1

Status of UXCStatus of UXCStatus of UXCStatus of UXC

Dick Loveless

20 January 2010

Dick Loveless 20 January 2010 2

Cooling problemCooling problemCooling problemCooling problem• The failing component is a bushing adaptor between the flow restrictor

and the rubber hose on the return assembly.

There are ~400 bushings of this type on YE1, YE2, YE3 (mostly on YE1) which could potentially fail. A large fraction are inaccessible (to valve off or repair) and, in case of failure, would require shutting down the disk

Proposed Plan: Open CMS beginning 16 Dec Beginning 4 Jan replace all bushings Close CMS (14 Feb?)

Dick Loveless 20 January 2010 3

Repair ProcedureRepair ProcedureRepair ProcedureRepair Procedure

1) Cut hose close to barb fitting2) Insert swivel fitting into the cut hose and

push hose onto the barb3) Remove bushing and inspect flow

restrictor diaphragm4) Reseat diaphragm if it is misplaced (~3-

5% misplaced)5) Place Loctite (sealant/lubricant) on the

first few threads of swivel fitting6) Screw swivel fitting into the flow restrictor

Measured time for a single fitting: 10 minutes

Dick Loveless 20 January 2010 4

Testing Procedure ITesting Procedure ITesting Procedure ITesting Procedure I• Gas

• Argon

• Insert Argon gas at 12 bar and use Argon sniffer to detect Argon

• Detector is large and heavy – must locate in cherry picker

• Need experience in operating

• Hydrogen

• Use bottle of non-flammable H2-Nitrogen (5% H2)

• Insert gas at 12 bar and use H2 sniffer

• Portable detector – easy to use and good sensitivity

Dick Loveless 20 January 2010 5

Testing Procedure IITesting Procedure IITesting Procedure IITesting Procedure II

• Water• Close off racks and miniracks (no high pressure on

heat exchangers)

• Fill disk with water and purge air for 4-5 hours

• Pressurize at 12 bar

• Visually inspect all new fittings for leaks

• Watch for pressure decay over several hours (20-30 mbar per hour acceptable)

• Decrease pressure and open racks and miniracks

• Circulate water normally and look for leaks

Dick Loveless 20 January 2010 6

StatusStatusStatusStatus

RepairAll 396 fittings replaced -- finished

TestingYE+3 -- Argon testing started

YE+2 -- H2 testing complete on IP side, Argon testing begun on non-IP side

YE+1 -- All testing complete -- operational

YE-1 -- All testing complete -- operational

YE-2 -- H2 testing complete on IP side, Argon testing complete on non-IP side, water testing begun

YE-3 -- H2 testing complete, water testing ongoing