Ratings
Series 4NP NATURAL DRAFT FIREBOX BOILER
All specications, dimensions and data subject to change without notice. Dimensions shown are measured in inches.
4NP BOILER MODELS 625 925 1250 1538 1850 2153 2500 3075 3690 4305
A - Boiler Length
141 152 164 165 169 177 192 191 214 243
B - Boiler Supply Height
95 103 113 127 145 151 151 151 151 151
C - Base Length at Mudleg
125 136 142 143 143 151 166 161 184 213
D - Boiler Width at Mudleg
62 68 74 80 86 92 92 104 104 110
E - Firebox Width
48 54 60 66 72 78 78 90 90 96
F - Firebox Length
112 123 129 130 130 138 153 148 171 200
G - Firebox Height
40 42 46 54 66 66 66 54 54 54
H - Supply Location
65 71 75 75 77 79 87 86 98 112
J - Supply Nozzle Size (300 Lb. Flg.)
4 6 6 6 8 8 8 8 10 10
K - Return Connection Location
31-1/2 31-1/2 31-1/2 31-1/2 31-1/2 31-1/2 31-1/2 31-1/2 31-1/2 31-1/2
M - Return Connection Size
1-1/2 1-1/2 1-1/2 2 2 2-1/2 3 3 3 3
N - Front Smoke Box Depth
10 10 12 12 14 14 14 16 16 16
P - Tube Removal Space
117 128 132 133 131 139 154 147 170 199
Q - Rear Flue Outlet Diameter
27 32 39 45 45 45 48 48 48 51
R - Base to Flue Centerline
67-3/4 73-1/4 81-15/16 91-5/8 109-9/16 112-9/16 112-9/16 107-7/16 107-7/16 107-7/16
S - Normal Water Line
76-1/2 83-7/8 92-5/16 104-1/4 121-1/4 125-13/16 125-13/16 122-3/8 122-3/8 122-3/8
AA - Width Over Columns
81 87 93 99 105 111 111 123 123 123
BB - Front and Rear Column Location
17 17 17 17 17 17 17 17 17 17
CC - Middle Column Location
46 54 54 55 55 61 69 64 78 85
Approximate Dry Weight (Lbs.)
16,211 19,675 24,562 27,390 32,595 39,030 40,190 46,370 55,000 61,996
Approximate Weight, Full (Lbs.)
22,575 28,055 34,458 39,469 46,598 56,156 58,591 67,911 79,165 90,160
REAR VIEWFRONT VIEW RIGHT SIDE VIEW
High Pressure Steam Boilers