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Filter drilling status

Filter drilling status. Claudio Bortolin Andrea Francescon Yannick Lesenechal Samuel Rambaut Rosario Turrisi. Reminder. The picture. Some pollution went into the lines It had to go through molecular sieve/hydrofilter of the plant (2 μm filter was installed after 1 year run) and/or

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Filter drilling status

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  1. Filter drilling status Claudio Bortolin Andrea Francescon YannickLesenechal Samuel Rambaut Rosario Turrisi

  2. Reminder The picture • Some pollution went into the lines • It had to go through molecular sieve/hydrofilter of the plant (2 μm filter was installed after 1 year run) and/or • It had to go through the first 60 μm inline filter and clog (and partly go through) the second inline filter • The second clogged filter cannot be replaced (have to disassembly the experiment) and causes: • less flow • pressure drop • The liquid heats up to room temperature along the path to the detector (~40 meters) – this was not a problem, if alone • The combination of the last two causes: • less flow in the single line  worse performance in the sector • bubbling before the capillaries  local and occasional loss of performance

  3. Reminder The environment • Layout of the PP4-PP3 pipe • Access point (2) Target point See next slide for a zoom-in

  4. Reminder The target D = 5.6 mm T = 11.8 mm X = 0.7 mm (~1 mm in the filtering area) S = 4 mm L = ~4500 mm D X T Filter Swagelok SS-4-VCR-2-60M L S Pipe: SS 316L 4-6 mm i-o diameter Swagelok 316 SS VCR Face Seal Fitting, 1/4 in. Female/Male Nut: SS-4-VCR-1 & SS-4-VCR-1 Swagelok gland 6LV-4-VCR-3-6MTB7 SEM picture of the filter

  5. Reminder Tools • Drilling: • tungsten carbide tip welded on twisted ss cable • drill to operate the rotation • counter-flow at 200 mbar w/manometer to detect the presence of the hole • Cleaning: • rilsan pipe connected to a rotary vane vacuum pump • magnet tip on twisted ss cable • cleaning machine to force counter-flow wise a cleaning fluid

  6. Reminder Edwards RV3 rotary vane 2-stage pump magnet cleaning machine Ø 2.5 mm ss twisted cable tungsten carbide 5-faces tip Ø 2.5 mm ss twisted cable

  7. Reminder Procedure • Pre-drilling cleaning • remove particles in the pipe • same procedure as cleaning • Drilling: • rotation of the tool inside the pipe by the drill • pressure drop (~20-30 mbar) on a manometer with specific trend when hole done • Cleaning: • suction of drilling remains with small pipe inside the stainless steel pipe (down to the filter) and vacuum pump • ‘’walk’’ with magnet inside the pipe • the steel of the filter is slightly magnetic • counter-flow with C6F14 for 30’ @ 1.5 bar • pipe drying with Ar flow @ 1.5 bar • repeat 1-4 4 more times (5 cycles total) • last counter-flow with fluid lasts 12 h TESTED DRILLING > 100 FILTERS !

  8. First application • ‘’Attack’’ first sector: #9 • It never worked properly • First one to be turned on for some time: 12/12/2007, h 15:13, for 41’ • Pre-cleaning: • 4 cycles • vacuum cleaning + 3 magnet sweeps + vacuum cleaning + counterflow • last counterflow left running overnight • flow: from 0.27 to 0.46 g/s • Drilling: February 15 morning • Cleaning: 5 cycles (overnight counterflow between cycle 3 and 4) • Results: Was: 0.27 g/s @ 6 bar Flow= 2.0 g/s @ 4.75 bar Was: 0% Modules on= 100%

  9. Further drilling! • First intervention: success! • Also sector #7 (0% on) and #6 (42% on) are in bad shape • Drilled both (#7 on Feb 27, #6 on March 6) • Pre-cleaning done as in previous cases • Cleaning: ‘’standard’’ 5 cycles, but: • Results were not satisfactory on sector #7, cleaned for 1 more day • Results: once again full performance recovered on both sectors! • half stave 6C0 has electronic issues – cannot be turned on

  10. Sector #7 analyses - 1 First cycle of cleaning…

  11. Sector #7 analyses - 2 Second cycle of cleaning… ok! On the carbon sticker On the filter

  12. New flow conditions • Old flow rate values from last November • 7 sectors above nominal value • 3 drilled, 4 because of pre-drilling cleaning • Sector #3 had 12 hs on, one went hot, expect still a few more 1.8 g/s new flow rate values old flow rate values drilled filters

  13. Current performance • Most work of configuration done • T/power distributions consistent with previous, but…115 hs on!! • Were 116, one hot on sector #3, still with low flow

  14. Current acceptance Efficiency changed from this… to this! (and more to come!) 62.5% (75/120 on) - Nov, 30 2011 95.8% (115/120 on) - Mar, 15 2012

  15. Perspectives • Expect a few hs lost in next weeks • flow not ideal yet in 3 lines • Drill 1-2 sectors at next TS • 3 only left with low flow: 5, 3 and 4, in descending performance order • Late delivery of the fiberscope, images of the drilled filters can be done at next TS

  16. Let’em flow! Lake Barriessa, Napa County, California, US

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