Steam condensate question
Steam condensate question
(OP)
If I have a LPS entering a coil, but I can not return by gravity. I have to pump the condensate pump back to the bfu, how do I calculate gpm.
Do I just find lbs/hr and then calculate using 1lb-water/hr = 8.34 gallons/lb-water x 60min/hr x SG
which gives me 1lb-water/hr = 500 gpm
or do I calculate gpm by:
btu/h = gpm x 500 x Tdiff
with btu/h = 960 x lbs/hr
Do I just find lbs/hr and then calculate using 1lb-water/hr = 8.34 gallons/lb-water x 60min/hr x SG
which gives me 1lb-water/hr = 500 gpm
or do I calculate gpm by:
btu/h = gpm x 500 x Tdiff
with btu/h = 960 x lbs/hr





RE: Steam condensate question
GPM Cond = (#/hr steam)/(8.35 #/gal)/(60min/hr)
So 1#/hr equals only 0.002 GPM
Since you have LP steam, flash loss in the condensate pump won't be enough to affect the GPM selection. If you know your steam load, you can calculate GPM.
RE: Steam condensate question
RE: Steam condensate question
8.33 lbs of water per US gallon, times 60 minutes per hour = 499.8. Round it to 500 lbs/hr.
Check out the publication "Hook-Ups" by Spirax-Sarco. It's full of info like this. If you're threatening to buy some of their products (traps, control valves, condensate pumps, etc.) the local rep will likely give you a copy or two.
RE: Steam condensate question
Close enough however it will vary as the pressure goes up and down.
RE: Steam condensate question
RE: Steam condensate question
RE: Steam condensate question
So for each 1 Lb/Hr of rated load, figure 2 or 2.5 lb/hr required for warm-up. You condensate pump will have to handle this additional load and must be sized accordingly. So your max pump load will then be 0.004 or 0.005 GMP for each lb/hr of running steam load.
RE: Steam condensate question