Ratings

Series 4NP RATINGS
BOILER MODEL MBH HP
Lbs.
Stm./Hr.
Steam
MBH
Sq. Ft.
Steam
Gas
MBH
#2 Oil
GPH
#6 Oil
GPH
#Lbs./Hr.
Coal* Fire Side
Furnace Volume
Cu. Ft.
Water Content
Gallons (Steam)
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
MAX. FIRING RATE
SINGLE FUEL
GROSS RATINGS
NET RATINGS
HEATING
SURFACE
SQ. FT.
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.
©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.