header length to equalizer pipe

Gmc310

is there a maximum length you can run from the T on the main to the equalizer pipe? tough to explain but the single riser comes up from the boiler to a 90 into a 12" horizontal nipple into the T which feeds the supply, on the other side of the T will be close to a 24" horizontal run to get to the equalizer pipe going into the hartford loop. Also can there be a 45 on that same 24" run or does it have to be a strait shot? forgive the tough explination, i am replacing my boiler and trying to pipe into the existing hartford loop/equalizer setup and into the supply, but my new Burnham's feeds exit differently than my old boiler as does the vent. any help will be appreciated. thanks, Gary from Boston

crash2009

Any chance

 of posting a picture?