General information Useful calculation data
7
Table 1 Heat input in British Thermal Units (Btu) required to raise one pound (lb) of steam.
Boiler pressure psi g
Feedwater temperature °F
50
70
80
100
120
140
160
180
200
212
250
15
1146
1126
1116
10961076105610361016 996
984
946
80
1169
1149
1139
1119
1099 1079 1059 1039 1019 1007
969
90
1171
1151
1141
1121
1101
1081 1061 1041 1021 1009
971
100
1172
1152
1142
1122
1102 1082 1062 1042 1022 1010
972
150
1179
1159
1149
1129
1109 1089 1069 1049 1029 1017
979
170
1180
1160
1150
1130
1110
1090 1070 1050 1030 1018
980
200
1182
1162
1152
1132
1112
1092 1072 1052 1032 1020
982
250
1185
1165
1155
1135
1115
1095 1075 1055 1035 1023
985
300
1186
1166
1156
1136
1116
1096 1076 1056 1036 1024
986
350
1187
1167
1157
1137
1117
1097 1077 1057 1037 1025
987
Table 2 Calorific value of various fuels (approximate values)
TYPE
CALORIFIC VALUE (Btu / lb)
ANTHRACITE
14,000
COAL
GOOD BITUMINOUS COAL
13,000
GOOD AVERAGE INDUSTRIAL COAL
12,000
POOR AVERAGE INDUSTRIAL COAL
9,000
GRADE
VISCOSITY
SPECIFIC GRAVITY
CALORIFIC VALUE (kJ / kg)
7.5 6
cSt
RED. 1 SECS
GAS OIL
4
35
0.835
19,600
OIL
LIGHT
50
210
0.935
18,700
MEDIUM
230
950
0.95
18,500
HEAVY
900
3500
0.97
18,300
GAS
100,000 Btu/Therm
AI-GAB-04 AB Issue 3
Page 2 of 3
The Cost of Steam - Imperial
Powered by FlippingBook