False waterline, or reservoir tank?

The equalizer is connected to the top. There are 2 bottom connections going into both of the boiler inlets.
The Hartford loop connection from the dry/wet return on the floor goes into the end of the tank. This takes 90 gallons to fill the entire system. Was built by a gas company welder.
Never runs out of water and makes no noise even with the 6' horizontal connection of the "HL".

The water fill is connected into this tank and also the boiler return inlet.

mike Would u be able to use the tank that s there as your resiviuor you would just have to get hung mid way and install a sight glass and a top and bottom connection . If u traced ur boilers water leaves and see that u have non sealed drips then by all means do a false water line if u don’t have much distance then u may be stick w putting a valporstat on it for insurance if you don’t have enough height .if u look at tha manafactures lit it should give u a steam to water rate on about how many gallons are steam per I think it’s 15 minutes if I remember right . It should be a easy sale considering it’s cheap then traps and all the rest that goes with it and all that maintaince false water lines and water seals and a resiourve tank is the best way to get away from pumped to gravity . The tanks are usually the only way to help a low water content steam boiler on a single pipe system function correctly with out flooding on the off cycle .looking at your pics it looks like it’s already piped in as a resiuorve tank .i think I would shut that feed valve and run her for a few days or put in a meter and chk water use and see what happens when she runs . In the past I ve run into system with seals and tha off cycle flooding what a pia . I think u have a good plan going forward peace and good luck clammy

I think that’s a smart idea to isolate make up and cycle it from a idle and see if it shuts off on low water . It would be nice if you could isolate the tank also so it’s completly outta the picture just to see if boiler water volume is enough .Do u have a equalizer line to the tank from your header or from your equalizer which ideally would be higher up like right before u drop to tie into the boilers return to the top of the tank . In re reading the nbp ing equilizer pipe goes directly into the tank ? I would myself rather see the nbp equilizer go directly into the boiler as standard practice and then pipe a 1 1/2 to 2 supply equilizer to the top of the tank and the same off the boiler return as per wiels diagrams even though there may be no issue the way it is . I would do it as I said then the tank sits idle on the side not acting as a equilizer go between and would be far easier to isolate and flush also . Sounds like a interesting project make sure to pay attention to all the details never want to be in between a rock and hard place .most I deal w would keep the way it is until boiler and or pump went but in rare cases the only way to make them function correctly is to go back to gravity and add the resiouve tank and possible false water line which in some some cases is far less then the alternative . Peace and good luck clammy