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The 2 Pass Dry Back Boiler
Available in Steam or Hot Water Versions
Ranging from 15 to 800HP and pressures up to 300 psig

STANDARD FEATURES :
  • Boiler is of the two-pass, scotch type, built and stamped in accordance with the requirements of the ASME Code, and listed by the National Board of Boilers and Pressure Vessel Inspectors.
  • Large combustion chamber with low heat release for complete combustion.
  • Smoke box is front-mounted with slip-on stack connector.
  • Access to fireside is accomplished with hinged and davited rear door (40 HP & larger) and with split front doors. Flame observation ports are on front and rear.
  • Openings for cleanout inspection of waterside are provided with 3” x 4” hand holes, and with 12” x 16” manholes (80 HP up).
  • Insulated with 2” high-density mineralwool, lagged with 22 gauge grip jacketing, baked on epoxy enamel to resist chipping and fading.
  • Firetubes are rolled and beaded on power boilers, expanded and flared on low pressure boilers (2” dia. Through 30 HP, 2 1/2” dia. 40 HP up).
  • Supports include lifting lugs securely welded to the top of shell; structural steel support legs on skids support the boiler so that special foundations are not required.
Standard Steam Trim
Standard Water Trim
  • Operating & limit pressure control
  • Modulating pressure control (when appl.)
  • Water column with gauge glass, trycocks, combination low water cutoff and pump controller
  • Steam pressure gauge with syphon and test cock.
  • Water column drain valve
  • Safety relief valve(s) per ASME code
  • Operating & limit temperature control
  • Modulating temperature control (when appl.)
  • Probe type low water cutoff control
  • Combination pressure, temperature, altitude gauge
  • Hot water return baffle for shock resistance
  • Safety relief valve(s) per ASME code
Boiler Specifications
(all dimensions are in inches)
- BOILER HORSEPOWER - - 15 20 25 30 40 50 60 70 80 100 -
- HEATING SURFACE FIRESIDE S Q. FT. 75 100 125 150 2 00 2 50 3 00 350 400 500 -
- STEAM OUTPUT FROM & @212° F LB/HR 517 690 862 1035 1380 1725 2070 2415 2760 3450 -
- GROSS OUTPUT   M BH 5 02 6 70 837 104 1339 1675 2008 2343 2687 3348 -
- FIRING RATE, GAS 1,000 BTU CFH 630 840 1050 1260 1680 2100 2520 2940 3360 4200 -
- FIRING RATE, LP GAS 9 1,500 BTU G PH 6 .9 9 .2 1 1.5 1 3.8 1 8.4 2 3 2 7.5 3 2.1 3 6.7 45.9 -
- FIRING RATE, #2 OIL 140,00O BTU GPH 4.5 6 7.5 9 12 15 18 20.7 24 30 -
- FIRING RATE, #5 & #6 OIL 1 50,000 BTU G pH 4 .2 5 .6 7 8 .4 1 1.2 1 4 1 6.8 1 9.3 2 2.4 28 -
A *NOTE: 1 STEAM OUTLET SIZE 150 PSI IN 1 1/4 1 1/4 1 1/4 1 1/2 1 1/2 2 2 2 1/2 2 1/2 3 A
A *NOTE: 2 STEAM OUTLET SIZE 1 5 PSI I N 2 1/2 3 3 4 4 4 6 6 6 6 A
B *NOTE: 2 WATER SUPPLY SIZE 30 PSI IN 2 1/2 3 3 3 4 4 4 6 6 6 B
C *NOTE: 2 WATER RETURN SIZE 3 0 PSI I N 2 2 1/2 3 3 3 3 4 4 4 6 C
D FEEDWATER CONNECTION - IN 1 1 1 1 1 1 1 1 1/4 1 1/4 1 1/4 D
E BLOWDOWN CONNECTION (VESSEL) BOTTOM I N 1 1 1 1 1 1/4 1 1/4 1 1/4 1 1/4 ( 2) 1 1/2 (2) 1 1/2 E
F STACK OUTLET SIZE OD. - IN 8 8 10 10 12 12 12 16 16 16 F
G FURNACE OD. - IN 16 16 18 18 20 20 20 24 24 24 G
H SHELL ID. - IN 36 36 42 42 48 48 48 54 54 54 H
I WIDTH WITHOUT TRIM - IN 44 44 50 50 56 1/2 56 1/2 56 1/2 62 62 62 I
J WIDTH WITH TRIM - IN 49 49 55 55 61 61 61 68 68 68 J
K LENGTH, FRONT TO REAR - IN 69 84 78 89 99 119 135 117 129 153 K
L LENGTH OVERALL - IN 103 118 113 124 134 154 170 155 167 191 L
M SKID LENGTH - IN 72 90 84 96 102 120 138 117 132 150 M
N SKID WIDTH - IN 30 30 36 36 40 40 40 44 44 44 N
O STEAM SUPPLY LOCATION - IN 29 26 30 35 40 48 48 53 53 67 O
P WATER SUPPLY LOCATION - IN 18 24 23 27 30 1/2 30 1/2 36 36 33 39 P
Q WATER RETURN LOCATION - IN 45 56 51 59 68 84 1/2 84 78 87 105 Q
R BLOWDOWN LOCATION 15 PSI & UP IN 18 17 18 18 23 23 1/4 23 1/4 25 25 - 66 25 - 89 R
S 1 1/4" SURFACE BLOW-OFF CONNECTION - IN 41 50 36 53 61 39 40 45 41 51 S
T STACK OUTLET LOCATION - IN 21 25 25 26 25 23 25 25 29 23 T
U SUPPLY HEIGHT - IN 51 51 57 57 63 63 63 71 71 75 U
V STACK HEIGHT - IN 54 1/2 54 1/2 60 1/2 60 1/2 66 5/8 66 5/8 66 5/8 74 5/8 74 5/8 74 5/8 V
W SHELL TO FLOOR HEIGHT - IN 12 12 12 12 12 12 12 14 14 14 W
X BURNER PROJECTION - IN 32 32 32 32 32 32 32 32 32 36 X
Y DOOR SWING - IN 0 23 1/4 23 23 28 28 28 31 31 31 Y
AA TUBE REMOVAL REAR IN 32 47 39 50 58 78 94 66 78 102 AA
BB TUBE REMOVAL FRONT IN 41 56 48 59 63 83 99 73 85 109 BB
- WATER CAPACITY @ NWL - GAL. 123 165 193 233 330 425 502 436 510 628 -
- WATER CAPACITY FLOODED - GAL. 146 195 225 271 383 493 582 528 606 761 -
- APPROX. SHIPPING WEIGHT (HIGH PRESS.) 150 PSI & UP LBS. 2975 3225 3850 4125 6100 7375 8250 9400 10300 12450 -
- APPROX. SHIPPING WEIGHT (LOW PRESS.) 15 & 30 PSI LBS. 2850 3075 3650 3925 5750 6950 7550 8100 9300 11100 -
- BOILER HORSEPOWER - - 15 20 25 30 40 50 60 70 80 100 -
- BOILER HORSEPOWER   - - 125 150 200 250 300 350 400 500 600 700 800 -
- HEATING SURFACE FIRESIDE SQ. FT. 625 750 1000 1250 1500 1750 2000 2500 3000 3500 4000 -
- STEAM OUTPUT FROM & @212°F LB/HR 4312 5175 6900 8625 10350 12075 13800 17250 20700 24150 27600 --
- GROSS OUTPUT MBH 4184 5021 6695 8369 10042 11716 13390 16738 20085 23432 26780 -
- FIRING RATE, GAS 1,000 BTU CFH 5250 6300 8400 10500 12600 14700 16800 21000 25200 29400 33600 -
- FIRING RATE, LP GAS 91,500 BTU GPH 57.3 68.8 91.8 114.7 137.7 160.6 183.6 229.5 275.4 321 367 -
- FIRING RATE, #2 OIL 140,00O BTU GPH 37.5 45 60 75 90 105 120 150 180 210 240 -
- FIRING RATE, #5 & #6 OIL 150,000 BTU GPH 35 42 56 70 84 98 112 140 168 196 224 -
A *NOTE: 1 STEAM OUTLET SIZE 150 PSI IN 4 4 4 6 6 6 6 6 8 8 8 A
A *NOTE: 2 STEAM OUTLET SIZE 15 PSI IN 8 8 8 10 10 10 12 12 12 12 12 A
B *NOTE: 2 WATER SUPPLY SIZE 30 PSI IN 6 8 8 8 10 10 10 12 12 12 12 B
C *NOTE: 2 WATER RETURN SIZE 30 PSI IN 8 6 6 6 8 10 10 10 10 12 12 C
D FEEDWATER CONNECTION - IN 1 1/2 1 1/2 2 2 2 2 2 2 2 2 2 D
E BLOWDOWN CONNECTION (VESSEL) BOTTOM IN (2) 1 1/2 (2) 1 1/2 (2) 2 (2) 2 (2) 2 (2) 2 (2) 2 (2) 2 (2) 2 (2) 2 (2) 2 E
F STACK OUTLET SIZE OD. - IN 16 16 20 20 20 24 24 24 26 26 30 F
G FURNACE OD. - IN 26 26 34 34 34 42 42 42 48 48 48 G
H SHELL ID. - IN 60 60 75.5 75.5 75.5 90 90 90 102 102 102 H
I WIDTH WITHOUT TRIM - IN 68.5 68.5 84.5 84.5 84.5 99 99 99 111 111 111 I
J WIDTH WITH TRIM - IN 73 73 89 89 89 105 105 105 118 118 118 J
K LENGTH, FRONT TO REAR - IN 175 195 164 195 216 177 189 224 216 246 278 K
L LENGTH OVERALL - IN 214 234 210 241 262 223 236 274 270 300 331 L
M SKID LENGTH - IN 174 198 168 192 216 168 180 220 216 258 288 M
N SKID WIDTH - IN 48 48 60 60 60 70 70 70 78 78 78 N
O STEAM SUPPLY LOCATION - IN 70 82 60 85 84 75 79 102 84 99 84 O
P WATER SUPPLY LOCATION - IN 48 48 39 48 54 39 48 54 60 60 60 P
Q WATER RETURN LOCATION - IN 120 132 117 138 150 117 132 162 158 180 204 Q
R BLOWDOWN LOCATION 15 PSI & UP IN 26 - 112 26 - 130 27 - 94 27 - 125 33 - 135 27 - 99 30 - 108 30 - 144 39 - 120 39 - 150 39 - 174 R
S 1 1/4" SURFACE BLOW-OFF CONNECTION - IN 52 64 81 64 60 60 65 78 66 80 65 S
T STACK OUTLET LOCATION - IN 25 29 34 27 30 25 25 29 36 48 49 T
U SUPPLY HEIGHT - IN 82 82 100 1/2 100 1/2 100 1/2 115 115 115 127 127 127 U
V STACK HEIGHT - IN 84 84 102 1/2 102 1/2 102 1/2 116 116 116 128 128 128 V
W SHELL TO FLOOR HEIGHT - IN 15 15 18 18 18 18 18 18 18 18 18 W
X BURNER PROJECTION - IN 36 36 42 42 42 42 43 45 48 48 48 X
Y DOOR SWING - IN 34 34 43 43 43 50 50 50 57 57 57 Y
AA TUBE REMOVAL REAR IN 118 138 103 134 155 105 117 153 141 171 193 AA
BB TUBE REMOVAL FRONT IN 131 151 112 143 164 119 131 167 152 182 209 BB
- WATER CAPACITY @ NWL - GAL. 999 1142 1274 1598 1815 1684 1872 2349 2739 3240 3687 -
- WATER CAPACITY FLOODED - GAL. 1160 1326 1547 1939 2204 2133 2364 2966 3427 4048 4607 -
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