Pump minimum secondary head
Pump minimum secondary head
(OP)
How do I find min secondary head and capacity from pump curve??
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Pump minimum secondary head
|
RE: Pump minimum secondary head
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pump minimum secondary head
RE: Pump minimum secondary head
Is this for a centrifugal pump or a PD pump??
~Usually you state rated head and flow and maybe min normal flow, but not head as that is your problem, not the pump vendors. All he can do is give you a pump to match your required duty, including min continuos flow, and then you work out everything else from the pump curve he gives you.
I still think we're at crossed purposes here though....
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pump minimum secondary head
Can you describe your system and needs more clearly. So far, this looks a bit like a "homework help" question.
Valuable advice from a professor many years ago: First, design for graceful failure. Everything we build will eventually fail, so we must strive to avoid injuries or secondary damage when that failure occurs. Only then can practicality and economics be properly considered.
RE: Pump minimum secondary head
You can look for the head at that flowrate on the curvre to get an idea of what it will be.
Independent events are seldomly independent.
RE: Pump minimum secondary head
If anyone can explain what the secondary head is I would appreciate it.
RE: Pump minimum secondary head
Still can't figure out the secondary capacity figure though. All I can think is that it is either a recomended min flow to still be reasonably efficient, or perhaps the second point that they actually test the pump at??
Actually, giving it even more thought, I think perhaps it is an opportunity for a designer to put two duty points to the vendor, i.e a main duty point (your 1440 x 87 ft hd) and also a second duty point for lower flow but higher head to see if the pump can do both. This might occur for example if you're filling a large tank and at the start you will have one flow rate and one head, but when the tank is nearly full (assuming it's quite a tall tank) you still want to have a certain min flow rate, but then need a higher min head. This is just an educated guess by the way.
If you only have one fixed duty then you don't need it.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pump minimum secondary head
There are process constraints that may require the owner to specify minimum flows/heads for the system. The end-user (through a consultant) should use the min flow & head spaces on data sheets to specify these if they are relevant.
A pump manufacturer's model selection may well be impacted by such information.
Meyers makes a good product, but not always Represented well.
RE: Pump minimum secondary head
B+W Engineering and Design
Los Angeles Civil Engineer and Structural Engineer
http://bwengr.com | http://bwstructuralengineer.com | http://bwcivilengineer.com