Sizing

Monday, September 29, 2014 1:12:00 PM

Sizing A Sussman Electric Steam Boiler

Use the following table to determine the KW boiler rating when steam load and feed water temperatures are known.

KILOWATTS PER POUND OF STEAM
WORKING PRESSURE (psig)

FEED WATER (°F)	0	15	50	100	150
50	0.3318	0.3359	0.3401	0.3429	0.3441
70	0.3259	0.3300	0.3343	0.3370	0.3382
100	0.3171	0.3212	0.3255	0.3283	0.3294
120	0.3112	0.3154	0.3196	0.3224	0.3236
150	0.3025	0.3066	0.3108	0.3136	0.3148
170	0.2966	0.3001	0.3050	0.3077	0.3089
200	0.2878	0.2919	0.2962	0.2978	0.3001

Example: Need a boiler to produce 450 lbs. steam/hr at 100 psig with an available feedwater temperature of 50°F.

From the above chart, find 0.3429 KW/lb. of steam.

450 lbs. steam/hr × 0.3429 = 154.3 KW boiler required.