To do the calc's I always use http://www.engineeringpage.com/engineering/pumps.html
choose pump conditions and just fill out the form, calculates for minimum and maximum conditions as described in the other answers.
There is a good calculator on the web: http://engineeringpage.com/engineering/pumps.html and choose Centrifugal Pump
Using this calculator it predicts a pump efficiency of about 90% (.894), so 93% looks just possible to me. Driver efficiency is excluded from this figure. The vendor has a good...
If you want to calculate the U value, a free webcalculator is available at www.engineeringpage.com
choose heat exchanger and pick the calculation that you want.
Regards
Further to the recommended velocities: try www.engineeringpage.com > line sizing
Then choose process fluid (or utilities if applicable), for this line sizing calculation a combo box choice can be made - if you take natural gas the program shows a recommended velocity of 30 m/s (appr 98 ft/s) in...
Try this one also:
www.engineeringpage.com
choose physical properties
and then physical properties pure fluids
Provides exactly what you mentioned plus more.
Regards, Wim
Johnab,
A wave can be shifted 1/2 a wave by using a 1/4 wavelength tube. The cancelation is correct for a 1/4 wavelength with a side tube which has the same diameter as the one you are connecting it to. This would be the filtered frequency.
For a frequency where the tube length equals half the...
1/4 lambda resonators are used quite a lot for reactive mufflers, for example for compressor or combustion engine noise abatement.
A quarter wave length resonator is a way to 'filter out' a tone. The principle is that a wave (sinus) wave plus the same wave that is half a wavelength out of phase...
If you want to calculate NPSH-available for an actual application, there is a free calculator routine at:
http://www.engineeringpage.com
choose pumps > pump condition
Wim
Believe you are on the right track with your calculations. A good analysis of the suction and discharge system and matching the head with the pump curve will give you the flowrate.
From your description I would look expect the temperature of the fluid to be different, after all the main...
OI was a little impressed with the amount of answers, but will add one anyway.
In case of liquid gravity flow, the static pressure of the liquid will be equal to the total pressure drop of the pipe. So in this case the pressure drop that is a result of the piping diameter and fittings etc are...
a good website to calculate this is www.engineeringpage.com
The line sizing routines show the maximum velocities that are guidelines from practice. Based on capacity a line size will be provided.
Good luck
Hi,
There is a free calculation routine on www.engineeringpage.com
Choose heat exchangers and then the thermal rating routine. You can then choose one of the two calculation forms. Will do thermal and pressure drop calculation for you. Of course this is an elaborate calculation so filling out...
Dear Rasmus,
Most methods use equivalent length equations, but in fact these are incorrect for laminar flow. The method that I like is the '2k method' published in an 1981 article:
The two-K method predicts head losses in pipe fittings
W.B. Hooper
Chemical Engineering, Aug 1981
Pages 96 to 100...
Looked at the first response from Artisi, which is pretty good. As long as there is enough margin between NPSH_available and NPSH_required the pump should work OK. The vapour pressure of the liquid is a function of temperature, the problem with a high altitude is that the pressure and therefor...
For normal line sizing the following site helps:
www.engineeringpage.com
Choose > Line sizing for a list of the calculators
It also has some good pressure drop / pump conditions calculation routines that can help you.
Regards, Wim
As long as the pressure drop is a within normal range the normal 'incompressible flow' formula can be used.
Try www.engineeringpage.com - the pressure drop routines will do the calculation work for you
