Vertical pipe run and pipe support
Vertical pipe run and pipe support
(OP)
Hello everyone,
* In a solar hot water closed loop project, I intend to run the vertical raisers (carrying the hot and cold heat transfer fluid)inside a chimney chase 3ft x 3ft. The chase runs vertically from the boiler room to the roof and is about 80 ft long. The problem is how to support the two 2" Copper 'L-type' pipes since there is no access to the chase from anywhere in the building. Will it be alright to have the pipes supported only at the bottom and top? I'm concerned about thermal expansion, buckling etc
* Another flow rate related question: The design flow rate in this closed system is 30 gal / min. I want to know if I can get away with a 1.5" diameter pipe at this flow rate. At these conditions, my flow velocity exceeds 5 ft/s. The industry practice is to keep the flow velocity below 4 ft/s - to avoid noise and pipe erosion I think. If the (2 ft/s < gpm < 4 ft/s) approach is wrong, on what other basis can the pipe diameter be selected for a given flow rate? Note: Flow rate (Q) = Velocity (V) x Area(A)
Look forward to your thoughts, thank you very much.
* In a solar hot water closed loop project, I intend to run the vertical raisers (carrying the hot and cold heat transfer fluid)inside a chimney chase 3ft x 3ft. The chase runs vertically from the boiler room to the roof and is about 80 ft long. The problem is how to support the two 2" Copper 'L-type' pipes since there is no access to the chase from anywhere in the building. Will it be alright to have the pipes supported only at the bottom and top? I'm concerned about thermal expansion, buckling etc
* Another flow rate related question: The design flow rate in this closed system is 30 gal / min. I want to know if I can get away with a 1.5" diameter pipe at this flow rate. At these conditions, my flow velocity exceeds 5 ft/s. The industry practice is to keep the flow velocity below 4 ft/s - to avoid noise and pipe erosion I think. If the (2 ft/s < gpm < 4 ft/s) approach is wrong, on what other basis can the pipe diameter be selected for a given flow rate? Note: Flow rate (Q) = Velocity (V) x Area(A)
Look forward to your thoughts, thank you very much.





RE: Vertical pipe run and pipe support
Otherwise, I am inclined, if possible, to *guide* the risers at the bottom and hang them from the top. Thermal expansion will be downwards without buckling or thusts, much as they would be in a boiler or for that matter a tall contactor with a riser or downcomer hung from the top.
Until someone proved me wrong, that would be my "going-in" position.
Regards,
SNORGY.
RE: Vertical pipe run and pipe support
Any other thoughts techies?
RE: Vertical pipe run and pipe support
RE: Vertical pipe run and pipe support
You don't want to secure the pipe to the side of the chimney at the top or bottom and deal with it twisting away from the wall during thermal expansion or hanging.