Sussman Boilers
Installation, Operation & Maintenance Manual
Sizing
19
Use the following Table to determine KW Boiler rating when steam load and feedwater temperatures are known.
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Feed Water
0 2 10 15 25 40 50 75 100 125 150
( F˚)
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40 .3347 .3355 .3375 .3388 .3406 .3422 .3431 .3447 .3458 .3464 .3470
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50 .3318 .3326 .3345 .3359 .3376 .3392 .3401 .3317 .3429 .3435 .3441
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60 .3288 .3296 .3316 .3329 .3347 .3363 .3372 .3388 .3400 .3407 .3411
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70 .3259 .3267 .3287 .3300 .3318 .3334 .3343 .3359 .3370 .3376 .3382
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80 .3229 .3238 .3278 .3271 .3288 .3305 .3313 .3329 .3341 .3347 .3353
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90 .3200 .3208 .3238 .3242 .3259 .3275 .3284 .3300 .3312 .3318 .3324
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100 .3171 .3179 .3199 .3212 .3229 .3246 .3255 .3271 .3283 .3288 .3294
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110 .3142 .3150 .3170 .3183 .3200 .3217 .3225 .3242 .3253 .3259 .3265
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120 .3112 .3210 .3140 .3154 .3171 .3287 .3196 .3212 .3224 .3230 .3236
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130 .3083 .3091 .3111 .3124 .3142 .3160 .3167 .3183 .3195 .3200 .3206
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140 .3054 .3062 .3082 .3095 .3113 .3129 .3137 .3154 .3165 .3171 .3177
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150 .3025 .3032 .3052 .3066 .3083 .3099 .3108 .3124 .3136 .3142 .3148
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160 .2995 .3003 .3029 .3036 .3054 .3070 .3079 .3095 .3107 .3113 .3118
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170 .2966 .2974 .2994 .3001 .3025 .3041 .3050 .3066 .3077 .3083 .3089
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180 .2937 .2945 .2964 .2978 2995 .3011 .3020 .3036 .3048 .3054 .3060
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190 .2907 .2915 .2935 .2948 .2966 .2982 .2981 .3007 .3019 .3025 .3030
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200 .2878 .2886 .2906 .2919 .2937 .2953 .2962 .2978 .2989 .2995 .3001
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Example:
Need a boiler to produce 450 lbs. steam/hr. at 75 psig with the available feedwater temperature 50˚ F.
From the chart above, find .3417 KW/Lb. of steam
450 lbs. steam/hr. x .3417= 153.8 KW boiler required
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