Choose timezone
Your profile timezone:
Powered by Indico
v3.3.3-pre
The decision has been taken for the Pad to use APSOPUR.
Fermilab will do the 20 support islands in cement-based with a flatness adjusted to +/-1mm.
[FGG] Correction: the specifications given to us is +/- 2mm.
Fermilab will order and install the bearing plate of 19mm to put on the 20 support islands.
[FGG] Done. See pict. attached to this event. The baseplate has been leveled by the alignment group yesterday. Today they will do the final tune.
Fermilab will order and install the G10 for the 20 support islands + 38 wall support islands.
[FGG] G10 for the 20 support pads have been ordered. Waiting delivery. Still need to order the G10- for the wall.
CERN ordered the APSOPUR H85-12 + APSOPUR P250-12 and we will receive them on the 9 of March. Received
We will send the Apsopur to Fermilab next week.
Following the review of last week:
FNAL Question: Engineer Notes for the lifting attachments -- this recommendation is probably my fault for not explaining well enough that we had the load tests and the drawings available at the time of the review. The committee was made aware of this documentation.
Andy's question:
I believe Frederic showed these two drawings for lifting the side walls. With this lifting arrangement, the side walls will not hang vertical because the lifting points are not above the wall center-of-gravity. I suggest we consider lifting the side walls above the center-of-gravity to make assembly easier.
Please let me know what you think.
FNAL Questions
(1) Dimitar, the committee would like to see a leak rate specified and provided to the group performing the leak test in order to validate the weld quality. Also, the committee felt that the "He spray and/or Dye
penetrant detection" based on such large area can be challenging so a
plan needs to be better develop on how this will be accomplished. I need your help to address this action item.
(2) Wall stabilizers -- the committee felt that FNAL engineer should take a look at the wall stabilizers being proposed in order to check its mechanical strength and configuration. FNAL engineer will do this.
Jim from Fermilab in regards to SBN-FD. My team of welders and I are looking forward to working with your team when you are here. I would like to run some weld samples here so we are prepared to do the welding when the time comes. I’m looking to get better clarification on what you need for the upcoming welding we will be doing for you and your team. My first understanding was we needed to weld the 4mm plates for the wall sections with 100% penetration to the I- BEAM. In our quick conversation in the meeting on Thurs. the 9th with you that doesn’t seem to be the case. Is that correct? It sounds like you are just looking for a leak tight weld? I was also wondering if for the welding process which is MIG welding if we could use FCAW (flux core wire) or GMAW (bare wire) had to be used? Also, is most of the welding to be done automated? We are looking to buy some automated equipment for SBN-FD which we will also be able to use on a future project coming up here at Fermilab. If there are more questions to be answered that I haven’t addressed please let me know . Looking forward to hearing from you and your team. Thank you.
Answer from Dimitar:
No need to weld the plates to the I-Beams. Please see attached the welding map.
Just a leak tight weld.
Flux-core-wire is strongly recommended (at least for efficiency reasons), but bare-wire is also acceptable. Please decide between them based on your experience. Currently at CERN we are exclusively using only flux-core (from Böhler).
I would also recommend some sort of automation. We are using KEMPPI A5 MIG Rail System 2500 (https://www.kemppi.com/en-US/offering/product/a5-mig-rail-system-2500/), and I can strongly recommend it. Just an observation: Despite the fact that it is advertised that can weld in any position, my welders are using it only at horizontal, and prefer to weld the vertical passes by hand, as well as all the corners (horizontal and vertical).
[FGG] The air compressor was tested and certified. It has been moved to the detector hall. One can regulate the pressure. Likely another one will be moved to the building for backup.
The tools were revised by the electrical safety committee chair. A detailed email was sent last night. I need to discuss further with our safety expert to ask for guidance. At first glance, we won't be able to use the Hitachi angle grinder & Milwaukee impact wrench because these tools are non-NRTL equipment. We are looking for alternatives.
All pneumatical tools are accepted and the one on battery will be accepted (to be confirmed by Fernanda)
[FGG] The battery operated tools can be accepted as long Fermilab provide the battery charger from US. In any case, Neutrino Division Tech. Group is planning to purchase tools for the department and the ones flagged by our ES&H Division are part of the list. Aria is going to pursue this.