Acceptable headloss?
Acceptable headloss?
(OP)
What is an acceptable headloss in a pipe? I am modelling and find a proposed plan to create 17.29 m/1000m of headloss. It is obviously a high value but what standards are typically applied to determine if it is acceptable or not?





RE: Acceptable headloss?
Reasonable Velocities for the Flow of Water through Pipe:
Boiler Feed.............8 to 15 ft/sec
Pump Suction ............4 to 7 ft/sec
General Service.........4 to 10 ft/sec
City.......................to 7 ft/sec
Transmission Pipelines...3 to 5 ft/sec
http://www.eng-tips.com/viewthread.cfm?qid=111206
RE: Acceptable headloss?
RE: Acceptable headloss?
RE: Acceptable headloss?
Working in the water industry, I find that people don't usually seem too concerned about flow losses, though.
RE: Acceptable headloss?
RE: Acceptable headloss?
In my industry, we use a column of water in a down tube(open to the atmosphere) to achieve various head pressures. In one of our down tubes, the diameter is 15" by 20' in length and is constricted to 6.75" by a nozzle at the base of the down tube. My question is, if you start out with a certain size diameter in a column of water and then nozzle it down to half that size, how do you determine how much head pressure you have coming out of the nozzle?
RE: Acceptable headloss?
Equation for flow through a nozzle:
q= CA sqrt (2gh)
C = discharge coefficient for nozzle
A = cross sectional area
g = acceleration of gravity = 32.2 feet per second
h = static head
RE: Acceptable headloss?
RE: Acceptable headloss?
RE: Acceptable headloss?
Go to Cranes Technical Paper 410.
Equation for flow through a nozzle:
q= CA sqrt (2gh)
C = discharge coefficient for nozzle
A = cross sectional area
g = acceleration of gravity = 32.2 feet per second
h = static head
The C is the flow coefficient for the nozzle and depends on the reynolds number. The q is the flow through the nozzle. The h in the equation is the head loss. Work backwords to find the head loss through the nozzle.
There will be a head loss through the nozzle and the amount of head loss depends on how much flow that you have.