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Filter drilling status

Detailed maintenance protocol for a drilling filter system to improve efficiency and performance, including procedures, tools, and results analysis.

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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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