When and where do you need P traps in refrigerant lines especially on high rises, and how do you handle retrofits and heat pumps?

2021.10.22 17:23 flippedelectron When and where do you need P traps in refrigerant lines especially on high rises, and how do you handle retrofits and heat pumps?

I'm not an HVAC guy - but I am a curious human. I ran into this topic and now I have questions for experts regarding oil return/p traps in refrigeration:
As far as I understand - if the refrigerant velocity in a suction line is sufficiently high - then oil return to the compressor should be fine right?
Why would we need to put a P trap in the suction line if we sized the piping to handle the refrigerant flow?
Also what about heat pump systems - do you put traps on both lines?
In high rises - do you have to put in traps like every 3 floors?
Edited follow up: what if you change refrigerant types in a high rise? In theory flow rate changes, and there's no way you'd pull new copper right?
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2021.10.22 17:23 lewz3000 SaaS for school admins: Dedicated Database for each SaaS client or a single database?

In an effort to improve my Database Architecture skills, I am trying to design a database for a hypothetical SaaS project for school admins to be able to better manage their schools.
The users of the SaaS are exclusively school admins. Students and teachers are not users of the SaaS.
Consider the following:

As already stated, all three schools (X, Y & Z) are using our SaaS product.
School X's admin had already created a record in our system to store Andrew's details (passport, ID, date of birth, address, etc.).
As expected, School Y's admin and School Z's admin will also attempt to create a record to store Andrew's details and they are oblivious to the fact that the system already has Andrew's details.
Should the system allow for a redundant entry to be added in or should it try mapping the input provided by admins Y and Z to the already existing record which was entered by admin X?
For example, when a school admin is registering a student, they would first be asked to provide a UID such as a phone number or passport number so that the system can check for an already existing record. If no record is found, admin can go ahead and create a new student. If, on the other hand, a student record is found, the admin will be notified that the student is already in the system Of course, the problem with this approach is that:
  1. the school admin can brute-force these UIDs and obtain data to students who are not even enrolled in their school. One solution would be to ask the admin for further info about the student they are trying to register - such as their email address and phone number;
  2. the student might have provided different schools with different details (possibly on purpose). The system would need to decide which details to store. Keep the original details provided by admin X or override them with the newly supplied data provided by admins Y or Z?
  3. if school X, Y and Z have to work with the same record - who has permission to update that record?
These shortcomings are pushing me to
I am guessing that the best solution for this problem would be that the SaaS provides each client with its own dedicated database. So instead of having a single students, teachers, courses, etc. table each with a school_id foreign key. Instead each should would have its own dedicated tables, something like this:
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2021.10.22 17:23 Maxtothe12thpower Who is your favorite male protagonist?

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2021.10.22 17:23 Stunna6972 [PS4] H: 2 Blood Eagle Outfits W: Offers

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2021.10.22 17:23 UpDogg13 Lightning tree

I assume a lot of us have read bast's story in Rouges, called the lightning tree.
I'm also assume this has been brought up, but I just made the connection myself. That's gotta be the tree from the bandit camp in WMF right? Which would put the way stone inn near the eld somewhere off the kings road right?!
Was listening to the audio book for the thousandth time today and BAM, that hit me as I've recently finally read the stories in Rogues, obviously Pats contribution first.
Mind = Blown, yet again!
Post: As we've all agreed, the audio book is so well done! And Pat is a freaking genius lol.
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2021.10.22 17:23 UKNewsByABot The Guardian view of cricketing minnows: no time to argue the toss | Editorial

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2021.10.22 17:23 Alex_andre_98 Hibernator, Killapps not working on Xiaomi Redmi 9

Hi I got Xiaomi Redmi 9. When I install Hibernator or Killapps applications, they are working normaly for few hours but after they stop working I m getting message: The accessibility service is not running. it doesnt work even after phone restart only if i uninstall this apps and install again they will work for few hours and then again stop working.
What is the problem? is Xiaomi blocking this apps? is there any way to fix this?
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2021.10.22 17:23 Canthinkaname Non è così male...vero?

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2021.10.22 17:23 hsm4ever10 Republican tells Royal Family to STRIP Meghan Markle of royal title for interfering in US politics

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2021.10.22 17:23 YoureInMyWaySir "Memorandum 10/31" written by SpoonOfEvil

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2021.10.22 17:23 cramdev Sweat Free Apparel

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2021.10.22 17:23 burkeyturkey TwinCAT Matrix Math Library

I got tired of hacking together simple matrix multiplication every time it came up, so I finally bit the bullet and made a comprehensive matrix math library for TwinCAT 3: TcMatrix.
I've used the siemens matrix functions before, and I was able to find a codesys library when googling that seemed pretty similar. Is anyone here familiar with matrix libraries for other platforms? I'd love to evaluate them and compare features.
This was also kind of an excuse to play around with dynamic memory allocation in TwinCAT and the TcUnit framework. Both were a lot easier than expected, so I think I might use them more in the future and encourage others to use them as well!
I have a few other libraries in the works, so any other style or documentation feedback would definitely be appreciated! The one thing I wish I could figure out is how to export the in-code documentation from TwinCAT so I wouldn't have to document everything twice :/
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2021.10.22 17:23 Vincinski Was Little Hope supposed to be a Silent Hill game?

There's been rumours that Supermassive pitched a Silent Hill game to Konami but it got canned, with all the similarities Little Hope has to Silent Hill, it really just seems like it's a rebranded Silent Hill spin-off. Has this been confirmed anywhere?
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2021.10.22 17:23 Agusretron ONE FOR ALL TE ESTÁ BUSCANDO, JUGADOR PROMEDIO

Buenas !! https://discord.gg/3ek9gPZm Queremos invitarlos al gremio (Y discord) de .- ONE FOR ALL .- Es una comunidad enfocada a mejorar en competitivo, buscar gente para jugar rankeds, compartir información y memes
Estamos buscando gente comprometida a trabajar con el gremio para subir en clasificaciones y personas que quieran divertirse o jugar de forma competitiva; organizamos torneos cada mes y medio ;
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2021.10.22 17:23 zanety Tronsmart Force Pro 60W Bluetooth Speaker (10/26/2021) {WW}

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2021.10.22 17:23 UKNewsByABot Man arrested by police investigating Manchester Arena terrorist attack

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2021.10.22 17:23 rishio6 A New Opening, by me, Inktober 2021

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2021.10.22 17:23 Prxjected i hope you’re doing good

7 failed tries led us to this. we don’t talk, we don’t know what we’re up to.
everything we went through, just for us to end up at strangers. i still think of you so much, it’s been 5 months since we ended it for good, but man how badly do i wish we could go for an 8th try.
i’ve been with two different people and none of them give me the feeling you give me. i can’t take pictures with any other girl, i can’t do anything without being reminded of you. of us. of everything we did together. we spent almost everyday of quarantine talking, seeing each other, to now having no contact.
there’s so much i have to tell you. i quit smoking, i know how disappointed you were that i picked it up. a new zillakami album came out recently, i wish i could show you it so badly. i remember the facetime we had that got you into him. there’s some new songs by $uicideboy$ i wanna show you, even though you hated their music, you always listened to the songs cause you knew how much i love them. god do i miss bothering you with music.
i hope university is going good for you. i really wish i could text you but i’m scared. i don’t know where you stand with me. do you hate me? do you miss me too?
you know i used to hate going to sleep cause i dreamt of you every night, but now i began to look forward to sleeping cause my dreams are the only place i can see you and relive the relationship.
i hope we can meet again and try again. you made me feel things no one else can. i hope you’re taking care of yourself. i really miss your family too. they made me feel so welcome.
thank you for the memories we made. i still relive a lot of them. especially the one where i took you driving around the city to see the christmas lights and you asked if we could do this next year.
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2021.10.22 17:23 yuutb offbrand cereals - sailor (music video)

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2021.10.22 17:23 Fanaat FP1 - Max and Lewis battling & Max flipping Lewis off

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2021.10.22 17:23 nocty90 Any alternative for this...hand cream?


https://preview.redd.it/d7i20sz592v71.png?width=640&format=png&auto=webp&s=0d836d3d2b8574172e8f57f81fb650d88218894a
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2021.10.22 17:23 Majestic_Egg204863 What do you guys think of my new tattoo?

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2021.10.22 17:23 Bean-Tester Umm excuse me sir

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2021.10.22 17:23 asterixestla European population in Algeria 1921

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2021.10.22 17:23 afarabicattire Boat neck embroide farasha

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