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#1
04-21-2008, 04:59 AM
 Unregistered Guest Posts: n/a
MMBTU to PPH

I am working on a project for steam savings. My steam cost is 8.0013/mmbtu, I need to calculate what my cost is per 1000pph.

Also if you could give me some pointers on figuring electricity savings that would be great also.

I really appreciate your help!!
#2
04-21-2008, 12:52 PM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,412 Rep Power: 12
Re: MMBTU to PPH

Quote:
 Originally Posted by Unregistered I am working on a project for steam savings. My steam cost is 8.0013/mmbtu, I need to calculate what my cost is per 1000pph. Also if you could give me some pointers on figuring electricity savings that would be great also. I really appreciate your help!!
Is pph pounds per hour? Also are you producing steam or using it? - either way, you might need to know the temperatures (start and end) and pressures. - This is by no means a simple question.
#3
04-22-2008, 12:22 PM
 rperry Guest Posts: n/a
Re: MMBTU to PPH

I am using 150# saturated steam in my process. Don't have a chart handy but I think it is 354degf, or somewhere close to that. I am doing a project that will potentially cut about 2,000,000 pounds of steam per month.

I pay for my steam in mmbtu, and I am not asure how to convert that to pounds so I can calculate the savings.'

I appreciate the help.
#4
04-23-2008, 03:55 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,439 Rep Power: 19
Re: MMBTU to PPH

I've never seen a steam contract and don't know how they are written. However, I would recommend looking at the contract as it may include the necessary factors. Or, speak to your steam supplier.

Do you return the steam at lower pressure/temperature (or condensed water)? The factor for BTU/lb should be the specific enthalpy of the steam as supplied, less the specific enthalpy as returned (if returned). This can be found in Steam Tables. Unfortunately, I don't know a lot about steam calculations, and can't help much more than that.
#5
05-23-2008, 01:05 PM
 Unregistered Guest Posts: n/a
Re: MMBTU to PPH

Lbs Steam delivered per Hour
Large boiler capacities are often given in lbs of steam evaporated per hour under specified steam conditions.

BTU - British Thermal Units
Since the amount of steam delivered varies with temperature and pressure, a common expression of the boiler capacity is the heat transferred over time expressed as British Thermal Units per hour. A boilers capacity is usually expressed as kBtu/hour (1000 Btu/hour) and can be calculated as

W = (hg - hf) m (1)

where

W = boiler capacity (Btu/h)

hg = enthalpy steam (Btu/lb)

hf = enthalpy condensate (Btu/lb)

m = steam evaporated (lb/h)

Boiler Horsepower - BHP
The Boiler Horsepower (BHP) is the amount of energy required to produce 34.5 pounds of steam per hour at a pressure and temperature of 0 Psig and 212 ?F, with feedwater at 0 Psig and 212 ?F. An BHP is equivalent to 33,475 BTU/Hr or 8430 Kcal/Hr and it should be noted that a boiler horsepower is 13.1547 times a normal horsepower.

Horsepower (hp) can be converted into lbs of steam by multiplying hp with 34.5.

Example

200 hp x 34.5 = 6900 lbs of steam per hour

Lbs of steam can be converted to hp by dividing lbs steam per hour by 34.5

Example

5000 lbs of steam / 34.5 = 145 hp boiler
#6
11-21-2008, 11:20 AM
 onuigbo@hotmail.com Guest Posts: n/a
Re: MMBTU to PPH

1 MMBTU is essentially equal to 1,000 pph of steam and if your cost of steam is \$8.00 per MMBTU is \$8.00 per thousand pounds of steam generated
#7
06-29-2011, 02:48 PM
 Unregistered Guest Posts: n/a
Re: MMBTU to PPH

I keep seeing the reference to 1,000 pph = 1 MMBTU, but I don't understand how this can be with varying steam temperatures and pressures. Won't 1,000 lbs of 270 psi steam have more energy than 1,000 lbs of 135 psi steam?

Thanks,

Jack
#8
06-29-2011, 06:02 PM
 HerrWarum Supreme Member Join Date: May 2011 Location: MD, USA Posts: 303 Rep Power: 3
Re: MMBTU to PPH

#9
06-30-2011, 07:47 AM
 Unregistered Guest Posts: n/a
Re: MMBTU to PPH

Thank you. I see that the answer is yes, it has slightly more energy, but in practical terms, the pressure doesn't matter much.
#10
02-01-2012, 01:37 PM
 Unregistered Guest Posts: n/a
Re: MMBTU to PPH

what is PPH mean?

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