Pump suction flow velocity limits
Pump suction flow velocity limits
(OP)
Does anyone know where the velocity limit values in the linked document come from? Hydraulic Institute standards? Other criteria?
http:// www.engine eringtoolb ox.com/pum p-suction- flow-veloc ity-water- d_228.html
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RE: Pump suction flow velocity limits
Ted
RE: Pump suction flow velocity limits
On fluids where the temperature, pressure or elevation are such that NPSHA isn't as much of an issue, I've seen much higher velocities used. I did some work on a tank farm and was surprised at the suction velocities the inline pumps operated at (diesel, kerosene) coming off atmospheric storage tanks. If you are interested I can dig up the data but if memory serves me right, they were in the area of 10 ft/sec. The reliability of the pumps was very good I remember.
For example, if you are dealing with a cooling water booster pump where the suction pressure is say 30 psig, you have close to 100 feet NPHSA. In that case, I wouldn't use those values.
RE: Pump suction flow velocity limits
http://virtualpipeline.spaces.msn.com
"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain
RE: Pump suction flow velocity limits
I'm participating in a 3rd-party review of another engineer's design. The pump suction velocities in some cases are higher than the limits in the linked document. I want to suggest these velocity limits, but they will carry much more weight if they are from a recognized industry organization rather than something I found on a website.
Can anyone cite a source for these limits?
BTW engineeringtoolbox.com does not respond to my enquiry.
RE: Pump suction flow velocity limits
I2I
RE: Pump suction flow velocity limits
With BFW, it is much more important to guarantee NPSHR is definately equalled or exceeded.
http://virtualpipeline.spaces.msn.com
"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain
RE: Pump suction flow velocity limits
You will be better to check the total inlet losses at such an elevated temperature and ensure that the pump NPSHr is satisfied with adequate margin.
RE: Pump suction flow velocity limits
I2I