Choosing the Right I-Beam Size for Ceiling Support: Wall Demolition & Partition Wall

Hello,
Needs help in selecting an I-section to support the floor. Below I present an approximate project. the red walls are to be demolished and I want to place I-sections in these places. The wall marked in blue is a partition wall on the first floor made of brick. Thank you in advance for your response

The red ones for demolition are load-bearing walls?
Instead of these walls, do you want to give I-sections as load-bearing beams?

These are partition walls 12 cm wide.

Yes, I want to use I-sections instead of these walls.

If they are only partition walls, then it would mean that the ceiling should be reinforced with concrete beams together with the ceiling? Then you don't need to give an I-beam. Peel off a piece of screed above the ceiling above the wall that you want to demolish, so you will check if there is a concrete ceiling beam there.
If there are no beams, if you want to dismantle these walls, first you have to support the ceiling along them with joists (three in each) so that the ceiling does not sag, because you will not insert the beams, and you will have to carry it, weakening the entire ceiling.
With a ceiling width of 4 m between the walls, it is easy and with reserve (it is not known how / what the ceiling will be loaded from above), 20-22 cm high I-sections are sufficient.

The ceiling may not rest on partition walls. So if the building is made in accordance with the construction art, you can remove the walls without making the structure strange with these I-sections.

janek1815 wrote:

if the building is made in accordance with the construction art

What if it isn't?
What is often common (especially when they are erected during construction together with load-bearing walls) when partition walls (without foundations) are "load-bearing".
That's why I wrote that he must check it.

Thanks for the answers, although this one wall is not there anymore and there are small cracks in the ceiling, so far I have it supported, as you say, 3 legions on each side

Hello, I have a similar layout to the one in the picture above, and on the first floor there is also a brick partition wall, what I-beam to choose? better regular 200,220mm or HEB 160mm? is it no difference?