Is it okay to enlarge the centrifugal pump’s outlet pipe by three stages?
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This post was last edited by shangrenyork on 2020-2-28 at 17:03. Issues encountered in the piping design for chemical process systems: The parameters of the chemical centrifugal pump in use are as follows – flow rate: 60 m³/h, head: 40 meters, power: 22 KW. The inlet pipe diameter is DN65, while the outlet pipe diameter is DN50. The medium being transported is a chemical slurry with a density of around 1.35 g/cm3. Regarding the selection of the pipeline diameter, my approach is as follows: Based on the process requirements of a flow rate of 60 m³/h, I have chosen a flow velocity of 2–3 m/s, which leads to the selection of a DN100 pipeline. But the pump’s outlet nozzle is only DN50, and it is necessary to enlarge it in three stages through diameter reduction; I’m not sure if this is feasible. It’s common to see situations where enlargement occurs in two stages, while three-stage enlargement is relatively rare.
It’s no problem to enlarge the pump outlet from DN50 to DN100; the pipes and valves will work fine
There’s no problem with enlarging it by three stages – going from DN50 to 80 and then to 100. Two reducer fittings are required, and that’s fine. This type of three-stage diameter change is commonly used in the field
The design institute suggests that I have also seen cases where a 4-stage expansion is used; as long as there is a sufficient straight pipe section at the outlet, a 3-stage expansion poses no major problems.
Scaling up to stage 3 is no problem; having two different sizes is also fine. Stage 3 diameter changes are commonly used in the field