Cast iron radiator piping

In the middle of a remodel and needed to disconnect and move / re pipe 4 radiators. I believe this is an old steam system converted to hot water. The loop in the basement has much larger pipe than the 3/4 " piping supplying the radiators. My question is the radiators on the 2nd floor were plumbed in series with the radiators below for these rooms. Can I put tees in the supply/return lines in the basement and plumb the radiators individually or should I plumb them in series like before? I would prefer to plumb them separately to be able to get 90 percent of the system back up and running and after the rooms on the first floor are redone install those radiators. Thanks BB

 

Much more information is needed before I will make any determination of how the system is or should be piped. You said that you have to move and repipe 4 radiators on the 2nd floor. Are these actual cast iron radiators and not cast iron baseboard or finned tube radiation. You also said that the radiators are piped in series (almost never done on cast iron radiators). Are you sure that your system has actually been converted to hot water? I would actually need to see pictures of the boiler, the radiation, and the piping before making any statements on the piping.

 

Some classification, cast iron radiators, yes oil fired hor water ( circulator pump in system ) Dunkirk boiler. There are 4 radiators, 2 on first floor, 2 on 2nd floor above the 2 below. It seems that so they did not have to add more inlet/outlets in the black iron loop in basement they plumbed the radiators directly above the first floor in series with the ones above. So 2 EA radiators in series. Only radiators plumb this way in whole house. Radiators worked heated the space this way. Thanks for the reply

 

Steam boy not sure how to add pictures

 

B,

How to insert pictures.

This is from one of PJ's posts, how to insert pics.

Hope this helps a little.