Different beer lines for different beers?

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I think I may find it difficult to explain my confusion, but let's give it a go.
Having read Getting A Good Pour – Kegged Beer CO2 Line Length and Pressure - Brewer's Friend it looks like different beer styles will require different lengths of beer line given the differing carbonation (hence different pressure).
Looking at the equation L = (P -(H x .5) – 1 ) / R if I had, say, an IPA at a pressure appropriate for the higher carbonation compared to, say, an English bitter, then the line length required would be longer. When I finish the IPA and then fill with an Engligh bitter, I would be at a lower pressure to suit the style, but then my beer line would be too long and presumably struggle to pour.

So do I need to keep different beer lines for different beers (as they will be set to different pressures)?

I am assuming with all the above that I am serving both at the same temperature, as I have no fridge/keezer etc.

 

[xozzx]

You could set the line length for the highest carbonated beer you make. If drinking a lower carbonated beer the only issue would be a slow pour, you could get around this by increasing the pressure before pouring then bleed it back to the carbonation pressure afterwards so it doesnt add any carbonation to the beer. It could be left at the higher pressure all evening then bled down once you are done.

Another option is to set the line to the lowest carbonated beer and install flow control taps. When pouring a higher pressure beer you can restrict the flow from the tap to prevent foaming.

 

[AnimatedGIF]

You could set the line length for the highest carbonated beer you make. If drinking a lower carbonated beer the only issue would be a slow pour, you could get around this by increasing the pressure before pouring then bleed it back to the carbonation pressure afterwards so it doesnt add any carbonation to the beer. It could be left at the higher pressure all evening then bled down once you are done.

Another option is to set the line to the lowest carbonated beer and install flow control taps. When pouring a higher pressure beer you can restrict the flow from the tap to prevent foaming.

Thanks, that's great! I like the sound of option 2 of the lowest length plus flow control tap for ultimate felxibility.

 

[user 18729]

You can use a secondary regulator as well

 

[Session]

Or you could use a flow-control disconnect. Lots of options!

 

[Edison]

If your using John Guest push fittings you could easily swap out the section of 3/16” line for a longer/shorter piece when you switch kegs to a different style of beer.

My keezer runs at ~6c (measured at the bottom of the keg) and usually all my lines are 1m. This works perfectly for me for most styles. I recently had a mild on at 8psi and it poured slowly (about 30s for a pint) but I could handle that. I currently have a Belgian Blonde on at ~25psi (~3.0 vol/CO2) so switched out to 3.5m.

If you run cleaner and sanitiser through your line and tap when you clean your empty keg it should be easy.