Hello again! Ok so I have a few suggestions regarding air pipes. Here’s my pitch:

• Make air pipes able to carry all gases (nat. gas, sour gas, etc). Currently, they’re restricted to only compressed air, which isn’t very useful…
• Make regular pipes unable to carry gaseous fluids (except maybe steam/sour gas). This would incentivize the player to actually use air pipes.
• Replace the iron components they use with steel components (it would make sense considering gas manipulation is unlocked with steel).

It would be neat if you could implement this, but if not I’d like some advice to do it myself. Is this feasible?
(I don’t have much time to chat right now, so I’ll write a little more about it tonight.)

Large balance changes like this won't be added to the Patchset. (The things that I have changed are to implement 2.0 features or for third-party mod compatibility.)

The fluid_box on pipes have a "filter" property, but you can assign only a single fluid, which is why IR3 has the water, steam and air pipes.

I think connection_category is a new feature in 2.0, which is how Space Age is able to prevent fusion plasma from entering standard pipes.

You might be able to hack this all together to make a new kind of pipe that only takes gaseous fluids from certain machines (and you'd need to change the machine outputs too).

Alright. I do understand why you wouldn't add this to your patchset.
I'll look into connection_category. I am aware the factorio devs said they would not make the filter property a list, so abusing that might be the next best thing.

Call a plumber might also be a potential fix to this, but I'd rather depend on the least amounts of mods for mine.
I'll put this on the back burner, and try to implement it to my addon eventually... when it comes out...

I can say i remember discussion on the topic back in the old IR3 github. That was the original intention. Having different pipes for gases and liquids. But it wasn't possible api wise, as you said. I think if possible now, it would be a good change, have the current air pipes be gas pipes and move them up the tech tree to where they would be sensible. Either at the same time iron pipes are unlocked or to the first oil processing tech that gives you a gas ( either sour or natural gas). Until then, players can still use copper steam pipes for steam.

EDIT: Wait, if i understand the connection-category. You couldn't have the refinery outputing gases nad fluids on the same port depending on the recipe, because it's the port itself that could connect to a pipe type or the other (or both, defeating the purpose)

EDIT: Wait, if i understand the connection-category. You couldn't have the refinery outputing gases nad fluids on the same port depending on the recipe, because it's the port itself that could connect to a pipe type or the other (or both, defeating the purpose)

Yeah, that's the unfortunate part.
However, I think "Call a plumber" might offer a satisfying solution. Then again, Shemp might not implement this into LSA (which is reasonable), I'll try to implement it in my addon eventually. (and maybe special refractory pipes for molten metals)

Hey Shemp, I'm trying to code an addon to make call a plumber do what I want with the IR3 pipes, but I'm having trouble with the valves.

I'm trying to remove the filter of the fluid boxes of air pipe entities, but the game doesn't seem to recognize air valves. Whether I call them as "valve" prototypes or "storage-tank" prototype (how IR3 did it before), it returns an error. (To be fair, I'm not even sure that's the correct way to remove a fluid box's filter, but I'm trying.)

Would you know how this could be fixed? Should I call this later, or is there something I forgot?
Below is a snippet of code I'm running in the data stage of my mod (which has your patched IR3 as a dependency).

-- Remove "air" filter from air pipes. Call a plumber will handle this, so the fluid specific filter needs to be removed
data.raw["pipe"]["air-pipe"].fluid_box.filter = ""
data.raw["valve"]["air-valve"].fluid_box.filter = ""
data.raw["valve"]["air-valve-overflow"].fluid_box.filter = ""
data.raw["valve"]["air-valve-underflow"].fluid_box.filter = ""
data.raw["pipe-to-ground"]["air-pipe-to-ground"].fluid_box.filter = ""
data.raw["pipe-to-ground"]["air-pipe-to-ground-short"].fluid_box.filter = ""

Run it in data-updates, this is when the Patchset makes changes to entities.