LST Mechanical Design Review

LST Mechanical Design Review 2004 IR-2 Installation Schedule H.J. Krebs October 22, 2003 H.J. Krebs

2004 Installation • Scope of work is located on top & bottom sextants • Remove 18 layers of RPCs • Install 6 layers of 7/8” thick brass absorber in layers 5,7,9,11,13 & 15 – 11.5 tons/sextant • Install LST detectors in layers 1,2,3,4,6,8,10,12,14,16,17 & 18 • An investigation will be performed at commencement of this down to determine if the layer 19 RPC can be retained at some functioning level H.J. Krebs

2004 Installation • Schedules do not include any time for: • Post and pre-run PEP survey work • In the past, this has been 2.5 to 3 work days • PPS certification • In the past, this has been 4 days • Tours and photography sessions • In 2002, we lost two days to this • If tours or photography sessions are important, they may occur between midnight and 07:00 • LST commissioning • 15 work days for bottom sextant • 2 work days for top sextant • Replacement of any LST detectors that have problems after installation H.J. Krebs

2004 Installation • Flux return steel • Side gap plates • Have removed many times • Very confident in schedule for these tasks • Center gap plates • Have never removed before • Very confident in schedule for these tasks • Corner plates • Have never removed before • Schedule times for these tasks are an educated guess • Test removal of two corner block bolts in summer 2003 • Somewhat easy to remove • Bolt threads appear to be in excellent condition • An unbolting/bolting sequence needs to be developed • Assume torquing these bolts 3 times during reinstallation • Helicoils • Have had trouble with these in the past • Assume a problem with 1% of helicoils • Means replacing two helicoils in 2004 • There is no time included in the schedule for helicoil replacement • Probably a few hours per helicoil replacement H.J. Krebs

2004 Installation • Steel position • Shall be monitored to assure that the barrel assembly is stable • Some early thoughts on this • Dial indicators at strategic locations • Survey targets added at strategic locations • i.e., on mid corner blocks to see if structure is becoming egg shaped • Take periodic measurements • At beginning for reference • After bolts are loosened on each corner plate • At the beginning of each day • At the beginning of second shift • At the end of each day • At end for final reference H.J. Krebs

2004 Installation • RPC removal • RPCs are “ripped” out • HV & gas line still connected on BWD end • Time may be lost cleaning the steel gaps of this debris • Bottom RPCs must be ripped loose, then cut, then pulled, then cut, etc. • Not enough space in Z to extract in one piece • RPCs range in weight from approximately 150 pounds for layer 1 to 250 pounds for layer 18 • 3600 sq ft of RPCs will be removed • Cover FWD beamline and detector face for protection H.J. Krebs

2004 Installation • Where do items go during the installation process? • Flux return steel to IR-12 • Flux return bolts • There are approximately 232 bolts 1-1/2”-6UNC x 14” lg. • Need to keep track of these • Need to protect threads • Platforms and walkways along service road to Building 611 • Main shield wall blocks along the Loop Road • RPCs thrown out in the IR-2 parking lot • Where do items come from during the installation process? • Steel handling fixtures from IR-12 • Elevator platforms from IR-12 • Brass absorber plates from IR-12 • LST detectors from SLD Collider Hall • Electronics and gas system from SLD Collider Hall H.J. Krebs

2004 Installation • Schedules are based on: • Mechanical installation assumes two 8-hour shifts per day, six days per week (3rd,6th and last week one 10-hour shift) – very taxing • LST installation assumes one 10-hour shift per day, six days per week • Mechanical installation team will provide support to LST team during this period and will also work one 10-hour shift per day, six days per week • Wireway installation, cabling and gas hookup will be performed on owl shift • Installation schedules denote IFR/LST work only • Work by other systems must be performed during owl shift H.J. Krebs

Hall Crew Actual Work Time (Two 8-hour Shifts) H.J. Krebs

Hall Crew Actual Work Time (One 10-hour Shift) H.J. Krebs

2004 Installation Schedule H.J. Krebs

Open FWD and BWD End Doors H.J. Krebs

Install EQ Braces & Remove IFR Cooling Loops Earthquaqe blocks are installed with shims. H.J. Krebs Earthquaqe blocks

Install Beam Line Protection, Remove Solenoid Support Arms Beam pipe protection can interfere with the man lift. H.J. Krebs

Remove Gap Plates, Upper Corner Blocks & Upper Flux Bar H.J. Krebs

Remove Lower Corner Blocks & Lower Flux BarInstall Elevator Platform, Begin Brass Absorber and LST Installation H.J. Krebs

2004 Installation H.J. Krebs

2004 Critical Path H.J. Krebs

Conclusions and Comments • 10 weeks of scheduled work time is needed to replace RPCs with 6 layers of brass absorber and 12 layers of LST detectors in both the top and bottom sextants if NOTHING goes wrong • Additional 4 days of PPS certification almost a certainty • Some time lost for tours and/or photography is a probability • No time allotted to replace LSTs that are not functioning properly after installation – overly optimistic • 17 days allotted for commissioning of lower sextant LSTs but only 2 days are allotted for commissioning of upper sextant LSTs • Many tasks have NEVER been performed previously – could be a long learning curve • Will lose 1:1 on schedule time for any of the above • There may be some schedule optimization possible – but not much. From the critical path it is determined that the schedule is: • Driven by crane usage – 1 crane • Driven by LST installation – 1 installation team • Most everyone is working in the same place – FWD end of barrel H.J. Krebs

Conclusions and Comments • Our mechanical installation team is aging • Have some young replacements but not as experienced • A mechanical breakdown of the crane would have an adverse schedule effect • An agreement must be worked out to deal with the VESDA system during this installation period • Have experienced significant schedule delays in the past by us setting off the fire alarms • A two month down would result in a reduced scope of work • Only one sextant could have the brass absorber/LST replacement, or • Remove RPCs and replace with brass in both sextants but NO LST installation (just an opinion), or • Some other option • Our goal is to be ready as early as possible to take advantage of any potential schedule advancement. H.J. Krebs

LST Mechanical Design Review