Discharge Header Velocity
Discharge Header Velocity
(OP)
What is the ideal design velocity for a pump discharge header pipe that has multiple branches taking off from it?Is there any established guide line on header velocities?
I am looking at a large chilled water plant that has currently a flow rate of around 120 l/s.The header is 300mm dia.We need to add a new chiller which will take the flow to around 160 l/s.Will a high header velocity cause an imbalance of flow into the take off branches?
I am looking at a large chilled water plant that has currently a flow rate of around 120 l/s.The header is 300mm dia.We need to add a new chiller which will take the flow to around 160 l/s.Will a high header velocity cause an imbalance of flow into the take off branches?





RE: Discharge Header Velocity
A high of up to around 5-6 m/s could be considered for short segments of pipe, provided that the liquid is clean and that overall pressure drop and waterhammer are not expected to cause trouble.
"If everything seems under control, you're just not moving fast enough."
- Mario Andretti- When asked about transient hydraulics
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RE: Discharge Header Velocity
Flow imbalance will be created by the pressure drop across the branches. No problem if you have flow setters for each chiller. Atleast, do the balancing by the pressure drop curve of the chiller.
RE: Discharge Header Velocity
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com
RE: Discharge Header Velocity
RE: Discharge Header Velocity
I was trained to select headers at low velocity(around 1.5 m/s) and use higher velocities(2~2.5 m/s) for branches leaving the header.Why? I do not have an answer.May be to ensure water in the header had no knetic head so as to make the system self balancing
RE: Discharge Header Velocity
Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com