peerless steam question

steve_6

just installed a Peerless 61 steam boiler. 2 risers off the top of the boiler. why would one side get steam before the other? On average 1-2 minutes difference...
thanks steve

Bob_19

Maybe

It's not venting as quick as the other riser. Is this problem new, or has it always done this?

steve_6

its always

done it

Unknown

Same thing happens

with the ECT steam boilers . The front pipe will get hot about 20 seconds faster than the back pipe . Maybe it has something to do with the shape of the boiler internally ? We started using the Burnham line and I'm gonna see if the same phenomenon happens .

By the way , has anyone ever taken a look at the top tapping on a Weil Mclain semi-commercial oil boiler ( I forget the model number , but it was the series just below the 88 ) ? It has a diverter that cuts across 1/2 of the tapping , I guess to push air towards the built in air elimination . I wonder how this affects the exit velocity when you use that boiler for steam ?

tgo_12

on oil fired

boilers the front half of the boiler will heat first. The majority of the heat tranfer is radiant, so the sections closest to the fire heat first. There is a limit to how deep into the boiler you can make a flame go, and most burners have a wide base to the flame with a narrow end. It really won't affect the system providing that the boiler is piped correctly. Nice header work Ron - are you going to the Blackman seminar this week?

Bob_19

With a cast iron

boiler I would have to say that it is a fair statement, uneven heating could be a distinct cause. Even though radiant heating is the prime factor here, this inturn goes to conductive, then to confective, as the heat is tranferred to the water. In a pressure vessel all of the water will need to absorb the required btu's to have the ability to convert to steam, through proper convective movement the water will mix and hotter water will be cooled by cooler water. As water evaporates to steam surface temp decreases continuing the convection movement.

It would appear that one riser is taking steam at a faster rate than the other. What could cause this?
Poor venting at the other loop.
As the steam begins it's travel up the riser it will effectivly cause a lower pressure situation just below causing more steam to take that route until enough steam is generated to where it can't handle the amount of flow causing the other riser to begin taking steam. This again will take you back to uneven venting most of the times.

steve_6

here are some pictures

anyone know how to shrink these down before you post them?

Unknown

poor venting?

could you explain that please?

Both risers connect to the same header, and vents.