Flanges - Cast iron (pump) / Carbon steel (piping)
Flanges - Cast iron (pump) / Carbon steel (piping)
(OP)
Hi,
Here I have a pump in cast iron, discharge nozzle 4" 125# FF, that shall be connected to a pipe line in carbon steel, flange 3" 150# RF.
Am I going to have any problem?
I'm worried with the possibilities below:
1 - Cast iron flange be broken during assembly due to its fragility.
2 - Cast iron "contaminate" carbon steel to be in touch.
What do you think about this situation? How can I solve this problem and finally connect equipment and piping?
Tks
Rodrigo Alves
Here I have a pump in cast iron, discharge nozzle 4" 125# FF, that shall be connected to a pipe line in carbon steel, flange 3" 150# RF.
Am I going to have any problem?
I'm worried with the possibilities below:
1 - Cast iron flange be broken during assembly due to its fragility.
2 - Cast iron "contaminate" carbon steel to be in touch.
What do you think about this situation? How can I solve this problem and finally connect equipment and piping?
Tks
Rodrigo Alves





RE: Flanges - Cast iron (pump) / Carbon steel (piping)
You need to buy a #125 FF 4" carbon steel flange with a full face gasket to mate with your pump FF flange. Mating a FF cast iron flange to an RF flange risks breaking the cast iron flange especially if it is subject to shock loading or cold temperatures.
I haven't heard of any contamination issues, by which i assume you mean galvanic corrosion.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Flanges - Cast iron (pump) / Carbon steel (piping)
RE: Flanges - Cast iron (pump) / Carbon steel (piping)
RE: Flanges - Cast iron (pump) / Carbon steel (piping)
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Flanges - Cast iron (pump) / Carbon steel (piping)
RE: Flanges - Cast iron (pump) / Carbon steel (piping)
The most common solution is to machine away the RF off of the steel piping flange..
Pump manufacturers don't like to supply pumps with RF flanges (causes delays
Tightening a ductile RF steel flange against a brittle cast iron flange has ruined pump casings in the past.
These people are the experts:
http://locator.gouldspumps.com/pom_0007.html
RE: Flanges - Cast iron (pump) / Carbon steel (piping)
So buy a 4" #125 c steel flange, RF if necessary and then machine the RF bit off and also a 4" x3" reducer to mate with your 3"pipework.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Flanges - Cast iron (pump) / Carbon steel (piping)
RE: Flanges - Cast iron (pump) / Carbon steel (piping)