Hawkins Electrical Guide v. 08 (of 10) / Questions, Answers, & Illustrations, A progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications

by N. Hawkins

	1,197 - 118
factor of evaporation =	—————— =	1.117
	965.7

for which the equivalent evaporation "from and at 212°" is

131,415 × 1.117 = 146,791 lbs. per hour

FACTORS OF EVAPORATION

Temp of feed water.	Steam Pressure by Gauge
Deg. Fahr.	50	60	70	80	90	100	110	120	130
32	1.214	1.216	1.220	1.222	1.225	1.227	1.229	1.231	1.232
40	1.206	1.209	1.212	1.214	1.216	1.219	1.220	1.222	1.224
50	1.195	1.197	1.201	1.204	1.206	1.208	1.210	1.212	1.214
60	1.185	1.188	1.191	1.193	1.196	1.198	1.200	1.202	1.203
70	1.175	1.178	1.180	1.183	1.185	1.187	1.189	1.191	1.193
80	1.164	1.167	1.170	1.173	1.175	1.177	1.179	1.181	1.183
90	1.154	1.157	1.160	1.162	1.165	1.167	1.169	1.170	1.172
100	1.144	1.147	1.150	1.152	1.154	1.156	1.158	1.160	1.162
110	1.133	1.136	1.139	1.142	1.144	1.146	1.148	1.150	1.152
120	1.123	1.126	1.129	1.131	1.133	1.136	1.138	1.140	1.141
130	1.113	1.116	1.118	1.121	1.123	1.125	1.127	1.129	1.130
140	1.102	1.105	1.108	1.110	1.113	1.115	1.117	1.119	1.120
150	1.091	1.095	1.098	1.100	1.102	1.104	1.106	1.108	1.110
160	1.081	1.084	1.087	1.090	1.092	1.094	1.096	1.098	1.100
170	1.070	1.074	1.077	1.079	1.081	1.083	1.085	1.087	1.089
180	1.060	1.063	1.066	1.069	1.071	1.073	1.075	1.077	1.079
190	1.050	1.053	1.056	1.058	1.060	1.063	1.065	1.066	1.068
200	1.039	1.043	1.045	1.048	1.050	1.052	1.054	1.056	1.058
210	1.029	1.032	1.035	1.037	1.040	1.042	1.044	1.046	1.047

Temp of feed water.	Steam Pressure by Gauge
Deg. Fahr.	140	150	160	170	180	190	200	210	220
32	1.234	1.236	1.237	1.239	1.240	1.241	1.243	1.244	1.245
40	1.226	1.227	1.229	1.230	1.232	1.233	1.234	1.236	1.237
50	1.215	1.217	1.218	1.220	1.221	1.223	1.224	1.225	1.226
60	1.205	1.207	1.208	1.210	1.211	1.212	1.214	1.215	1.216
70	1.194	1.196	1.197	1.199	1.200	1.202	1.203	1.205	1.206
80	1.184	1.186	1.187	1.189	1.190	1.192	1.193	1.194	1.195
90	1.174	1.176	1.177	1.179	1.180	1.181	1.183	1.184	1.185
100	1.164	1.165	1.167	1.168	1.170	1.171	1.172	1.174	1.175
110	1.153	1.155	1.156	1.158	1.159	1.160	1.162	1.163	1.164
120	1.143	1.145	1.146	1.147	1.149	1.150	1.151	1.153	1.154
130	1.132	1.134	1.136	1.137	1.138	1.140	1.141	1.142	1.144
140	1.122	1.124	1.125	1.127	1.128	1.129	1.131	1.132	1.133
150	1.111	1.113	1.115	1.116	1.118	1.119	1.120	1.121	1.123
160	1.101	1.103	1.104	1.106	1.107	1.108	1.110	1.111	1.112
170	1.091	1.092	1.094	1.095	1.097	1.098	1.099	1.101	1.102
180	1.080	1.082	1.083	1.085	1.086	1.088	1.089	1.090	1.091
190	1.070	1.071	1.073	1.074	1.076	1.077	1.078	1.080	1.081
200	1.059	1.061	1.063	1.064	1.065	1.067	1.068	1.069	1.071
210	1.049	1.051	1.052	1.053	1.055	1.056	1.057	1.059	1.060

Temp of feed water.	Steam Pressure by Gauge
Deg. Fahr.	230	240	250	260	270	280	290	300
32	1.246	1.247	1.248	1.250	1.251	1.252	1.253	1.254
40	1.238	1.239	1.240	1.241	1.242	1.243	1.244	1.245
50	1.228	1.229	1.230	1.231	1.232	1.233	1.234	1.235
60	1.217	1.218	1.219	1.220	1.221	1.222	1.223	1.224
70	1.207	1.208	1.209	1.210	1.211	1.212	1.213	1.214
80	1.196	1.198	1.199	1.200	1.201	1.202	1.203	1.204
90	1.186	1.187	1.188	1.189	1.190	1.191	1.192	1.193
100	1.176	1.177	1.178	1.179	1.180	1.181	1.182	1.183
110	1.166	1.167	1.168	1.169	1.170	1.171	1.172	1.173
120	1.155	1.156	1.157	1.158	1.159	1.160	1.161	1.162
130	1.145	1.146	1.147	1.148	1.149	1.150	1.151	1.152
140	1.134	1.135	1.136	1.137	1.138	1.139	1.140	1.141
150	1.124	1.125	1.126	1.127	1.128	1.129	1.130	1.131
160	1.113	1.115	1.116	1.117	1.118	1.119	1.120	1.121
170	1.103	1.104	1.105	1.106	1.107	1.108	1.109	1.110
180	1.093	1.094	1.095	1.096	1.097	1.098	1.099	1.100
190	1.082	1.083	1.084	1.085	1.086	1.087	1.088	1.089
200	1.072	1.073	1.074	1.075	1.076	1.077	1.078	1.079
210	1.061	1.062	1.063	1.064	1.065	1.066	1.067	1.068

One boiler horse power being equal to an evaporation of 34½ lbs. of water from a feed water temperature of 212° Fahr., into steam at the same temperature, the boiler capacity is accordingly

148,105 ÷ 34.5 = 4,293 boiler horse power.