Burnham 4NP Coal Ratings

High Pressure Steam Boilers

Series 4NP NATURAL DRAFT FIREBOX BOILER

REAR VIEWFRONT VIEW RIGHT SIDE VIEW

4NP BOILER MODELS 625 925 1250 1538 1850 2153 2500 3075 3690 4305

A - Boiler Length

B - Boiler Supply Height

C - Base Length at Mudleg

D - Boiler Width at Mudleg

E - Firebox Width

F - Firebox Length

G - Firebox Height

H - Supply Location

J - Supply Nozzle Size (300 Lb. Flg.)

K - Return Connection Location

M - Return Connection Size

N - Front Smoke Box Depth

P - Tube Removal Space

Q - Rear Flue Outlet Diameter

R - Base to Flue Centerline

S - Normal Water Line

AA - Width Over Columns

BB - Front and Rear Column Location

CC - Middle Column Location

Approximate Dry Weight (Lbs.)

Approximate Weight, Full (Lbs.)

All specications, dimensions and data subject to change without notice. Dimensions shown are measured in inches.

141 152 164 165 169 177 192 191 214 243

95 103 113 127 145 151 151 151 151 151

125 136 142 143 143 151 166 161 184 213

62 68 74 80 86 92 92 104 104 110

48 54 60 66 72 78 78 90 90 96

112 123 129 130 130 138 153 148 171 200

40 42 46 54 66 66 66 54 54 54

65 71 75 75 77 79 87 86 98 112

4 6 6 6 8 8 8 8 10 10

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

1-1/2 1-1/2 1-1/2 2 2 2-1/2 3 3 3 3

10 10 12 12 14 14 14 16 16 16

117 128 132 133 131 139 154 147 170 199

27 32 39 45 45 45 48 48 48 51

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

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

81 87 93 99 105 111 111 123 123 123

17 17 17 17 17 17 17 17 17 17

46 54 54 55 55 61 69 64 78 85

16,211 19,675 24,562 27,390 32,595 39,030 40,190 46,370 55,000 61,996

22,575 28,055 34,458 39,469 46,598 56,156 58,591 67,911 79,165 90,160

Series 4NP RATINGS

GROSS RATINGS

NET RATINGS

MAX. FIRING RATE

SINGLE FUEL

Lbs.

BOILER MODEL MBH HP

4NP625-62 3,348 100 3,450 2,598 10,825 4,185 30.3 27.9 328* 625 148.5 764

4NP925-62 5,021 150 5,175 3,896 16,233 6,276 45.5 41.8 492* 925 186.6 1,006

4NP1250-62 6,695 200 6,900 5,195 21,646 8,369 60.6 55.8 656* 1,250 238.0 1,188

4NP1538-62 8,369 250 8,625 6,494 27,058 10,461 75.8 69.7 820* 1,538 315.7 1,450

4NP1850-62 10,043 300 10,350 7,793 32,471 12,554 91.0 83.7 984* 1,850 407.7 1,681

4NP2153-62 11,716 350 12,075 9,092 37,883 14,645 106.1 97.6 1148* 2,153 471.9 2,056

4NP2500-62 13,390 400 13,800 10,391 43,296 16,738 121.3 111.6 1312* 2,500 521.3 2,209

4NP3075-62 16,738 500 17,250 12,989 54,121 20,923 151.6 139.5 1,640* 3,075 500.42 2,586

4NP3690-62 20,085 600 20,700 15,586 64,942 25,106 181.9 167.4 1,968* 3,690 574.05 2,901

4NP4305-62 23,433 700 24,150 18,184 75,767 29,291 212.3 195.3 2,296* 4,305 716.22 3,381

4NP625-50 4,184 125 4,312 3,247 13,529 5,230 37.9 34.9 282** 625 148.5 764

4NP925-50 6,193 185 6,383 4,806 20,025 7,741 56.1 51.6 417** 925 186.6 1,006

4NP1250-50 8,369 250 8,625 6,494 27,058 10,461 75.8 69.7 563** 1,250 238.0 1,188

4NP1538-50 10,043 300 10,350 7,793 32,471 12,554 91.0 83.7 676** 1,538 315.7 1.450

4NP1850-50 12,386 370 12,765 9,612 40,050 15,483 112.2 103.2 834** 1,850 407.7 1,681

4NP2153-50 14,394 430 14,835 11,170 46,542 17,993 130.4 119.9 969** 2,153 471.9 2,056

4NP2500-50 16,738 500 17,250 12,989 54,121 20,923 151.6 139.5 1,127** 2,500 521.3 2,209

4NP3075-50 20,085 600 20,700 15,586 64,942 25,106 181.9 167.4 1,352** 3,075 500.42 2,586

4NP3690-50 23,433 700 24,150 18,184 75,767 29,291 212.3 195.3 1,577** 3,690 574.05 2,901

4NP4305-50 28,454 850 29,325 22,080 92,001 35,568 257.7 237.1 1915** 4,305 716.22 3,381

NOTES:

1. Boiler model sux “62” indicates 6.15 sq. ft. F.S.H.S. /HP and “50” indicates 5 sq. ft. F.S.H.S./HP.

2. Firing rate based on:
Natural gas @ 1000 BTU/cu. ft. and 80% heat transfer eciency.
#2 oil @ 138 MBH/gal. and 80% heat transfer eciency.
#6 oil @ 150 MBH/gal. and 80% heat transfer eciency.
* 100% coal input @ 13,000 BTU/pound and 78.5% heat transfer eciency (6.15 rating).
** Coal input @ 13,000 BTU/pound limited to 70% of input in order to develop 5 sq. ft. rating.

3. Furnace volume is measured from the bottom of the boiler mud leg (no deduction for bridgewall).

4. Approximate dry weight includes H columns and base casing.

Stm./Hr.

Steam

MBH

Sq. Ft.
Steam

Gas

MBH

#2 Oil

GPH

#6 Oil

GPH

#Lbs./Hr.

HEATING
SURFACE

SQ. FT.

Coal* Fire Side

Furnace Volume

Cu. Ft.

Water Content

Gallons (Steam)

©2012 Burnham Commercial
P.O. Box 3939 • Lancaster, PA 17604
Phone: [phone] • Fax: [phone]
www.burnhamcommercial.com

Form No. PL81465521005-12/12-1Mc
Printed in the U.S.A.