Steam Flowrate

1 ton = 1000 kg = 1 m3

i forget to mention 8ton/ hr from & at 100degree celcius....

i choose 13 bar bcos it's the max operating pressure for the boiler...

i found the steam specific volume at

http://www.thermexcel.com/english/tables/vap_eau.htm

You've confused things now. What do you mean by "from & at 100degree celcius"? Specific volume varies with pressure and temperature and 0.151 m³/kg checks out OK for saturated steam at 13 bar abs (192°C). But at 100°C (1 bar abs) it's 1.67 m³/kg.

As Tornado said, the method is correct.

Cheers.........Codey

8ton/ hr from & at 100degree celcius.... The steam temperature is not 100C but the manufacture conforms to capacity generation of boiler 8000 kg/hr at 13 bar provided the feed water is at 100C. If the feed water is less then < 8 TPH will be generated . For every 6C fall in feed water themperature the boiler efficiency/generation too falls by 1 %.

I don't have a steam table in front of me, but that looks about right, and the method is correct.

When you buy at Boiler 8 tph at 100 deg c feed water temperature at 13 bar, it is designed to give 8 Tph. It cannot give 12 Tph. If it is an ANSI standard 3 pass boiler its factor is 6.9 lbs/sft.

So 8 Tph = 8 x 2205=17640 lbs/hr /6.9 = 2556.5 sft = 237.5 m2 heating surface. or 34.5 lbs = 1 BoHP(Boiler HP). 17640/34.5 = 511.3 BoHP = 8 Tph

A (Din standard) German Standardkessel = 8.3 lbs/sft= 2125.0 sft= 197.4 m2

An Italian(garioni) = 10.5 lbs/sft = 1680 sft = 156 m2

An England(Danks/Ruby Lincoln) = 10 lbs/sft = 1764 sft = 164 m2

A Reverse flue (1 pass via tubes & flue reversing in hamber)= 12.5 lbs/sft = 1411.2 sft = 131 m2

An 8 TPH Boiler can give 8.5~ 9.0 Tph (depending on the tubes heating surface sft/m2) but cannot give 12 Tph.

Please check the manual for Rating BoHP or heating surface sft/m2 and Boiler maker.

Also check the spec. sheet detailing op. pressure/test pressure/capacity/fuel/weight/chimney size etc. It will be mentioned capacity kg/hr or TPH or Lbs/hr at 100 deg C /212 F feed water temperature.

To be 12000 m3/ 12000 kg/ 12 Tph / 26460 lbs/hr = 767 BoHP

Divide the lbs/hr by each Factor to get the heating surface and match with your manufacturer's.

ok. boiler capacity is 8ton/hr from & at 100deg c. it didnt say Atm so i would assume it's Atm.

given the feedwater lower than 100degc and operating pressure at 13 bar....therefore

evaporation factor x 8ton/hr = value less than 8ton/hr.

i wanted to get the steam flowrate to estimate how much water (not steam) is being used by the boiler.

the boilerhouse does not have any steam flowmeter and water flowmeter or any measuring device on the feedwater tank.

Install a hot water (120C) flow meter on feed pump outlet discharge for accurate reading of flow.