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Scotch Marine : Wetback : 400 Series
Available in Steam or Hot Water Versions Three Pass Wet Back Design, 30 to 1800 HP, 15 to 300# Steam, 30 to 160# @ 250آ°F hot water.

  • Three-pass wet back design eliminates refractory baffles between flue gas passes.
  • Minimum maintenance with rugged construction for extra-long life.
  • U.L. listed boiler/burner package for firing gas, oil and combination gas/oil.
  • Factory tested and checked for optimum operating efficiency.

Standard Features

Durability
Built in accordance with the ASME Code, the wet back design has proven to give much longer useful life cycles than dry back boilers.

Quality
Each unit is tested and inspected, and is registered with the National Board of Boiler and Pressure Vessel Inspectors.

Design
Hurst Boiler utilizes state of the art computer design techniques in every boiler. This accounts for accurate calculations of construction materials and optimum utilization of the boiler's performance criteria.

Efficiency
The Series 400 is designed for optimum fuel efficiency and has proven in certified tests to meet and often exceed the efficiencies of 4-pass boilers.

Low Maintenance
There is no refractory rear door, to maintain and no refractory baffles to replace. Elimination of these components results in thousands of dollars of savings.

Tube Sheets
The wet back has independent tube sheets with uniform temperatures. Three and four pass dry back boilers have tube sheets with large temperature variations and this results in premature tube failure and cracks in the tube sheets.

Easy Access
Since there is no large refractory rear door, one man can easily remove the rear cover plates for access to the tubes. Front doors can be opened without removing burner components or controls.

Compact
With computer aided design, Hurst has made the wet back a space saving workhorse without sacrificing the principle of 5 sq. ft. of heating surface per BHP.

Combustion
Hurst uses name brand burner components with proven reliability. Every unit is boiler/burner compatible and tested at the factory prior to shipment.

Standard Steam Trim Standard Water Trim
  • Operating & high limit pressure control
  • Water column with gauge glass combination low water cut-off & pump control
  • Probe type auxiliary low water cut-off with manual rest
  • Water column drain valve
  • Safety relief valve(s)) per ASME Code
  • Steam Gauge
  • Stack Thermometer
  • Operating & high limit temperature control
  • Low water cut-off control with manual reset
  • Combination pressure, temperature gauge
  • Hot water return baffle for shock resistance
  • Safety relief valve(s)) per ASME Code
  • Stack thermometer


Wet Back Advantage
Dry backs are subject to deteriorating rear refractory, leaking baffles, leaking door seals, and often found with a heat-stressed rear tubesheet. Fragile refractory baffling and door seals will require continuous monitoring, maintenance, and replacement, costing thousands of dollars in materials and specialized labor cost over the life of the boiler. In addition, broken baffles and leaking seals will short-circuit boiler efficiency up until repairs can be made, and downtime during repairs can bring your production process to a halt.

All of those frustrating problems have been designed out of the Hurst Series 400 Wetback. It has a full wet back radiant heat transfer area that promotes superior internal water circulation and rapid heat absorption. Separate rear tubesheets allow each pass of tubes to expand and contract at its own rate without tube-to-sheet stress. Tubes are mechanically rolled, flared and beaded, making any tube service a simple matter. The only rear refractory is a 18 inch plug which allows access to the furnace for inspection.





Specification Data Chart
BOILER SPECIFICATIONS (ALL DIMENSIONS ARE IN INCHES)
  BOILER HORSEPOWER 30 40 50 60 70 80 100 125 150 200 250  
  HEATING SURFACE FIRESIDE SQ. FT. 150 200 250 300 350 400 500 625 750 1000 1250  
STEAM OUTPUT FROM & @212°F LB/HR 1035 1380 1725 2070 2415 2760 3450 4313 5175 6900 8625
GROSS OUTPUT   MBH 1004 1339 1674 2009 2343 2678 3348 4184 5021 6695 8369
FIRING RATE, GAS 1,000 BTU/CF CFH 1260 1680 2100 2520 2940 3360 4200 5250 6300 8400 10500
FIRING RATE, LP GAS 91,500 BTU GPH 13.8 18.4 23 27.5 32 36.7 46 57 69 92 115
FIRING RATE, No.2 oil 140,00O BTU GPH 9 12 15 18 21 24 29.9 37.4 45 60 75
FIRING RATE, #5 & #6 OIL 150,000 BTU GPH 8.4 11.2 14 16.8 19.6 22.4 28 35 42 56 70
A *NOTE: 1 STEAM OUTLET SIZE 150 PSI IN 1 1/2 2 2 1/2 2 1/2 3 3 4 4 4 4 6 A
A *NOTE: 2 STEAM OUTLET SIZE 15 PSI IN 4 4 4 6 6 6 8 8 8 8 10 A
B *NOTE: 2 SUPPLY SIZE 30 PSI IN 4 4 4 6 6 6 8 8 8 8 10 B
C *NOTE: 2 RETURN SIZE 30 PSI IN 4 4 4 4 4 4 6 6 6 6 8 C
D FEEDWATER CONNECTION   IN 3/4 3/4 3/4 1 1 1 1/4 1 1/4 1 1/4 1 1/4 1 1/2 1 1/2 D
E BOTTOM BLOWDOWN SIZE HIGH PRESS. IN 1 1 1/4 1 1/4 1 1/4 1 1/4 1 1/4 1 1/4 1 1/4 1 1/4 1 1/4 1 1/4 E
E BOTTOM BLOWDOWN SIZE LOW PRESS. & HW IN 1 1/4 1 1/4 1 1/4 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2 2 2 2 E
F STACK OUTLET SIZE O.D.   IN 10 10 10 12 12 12 14 14 16 16 18 F
G FURNACE O.D.   IN 14 14 16 18 18 18 22 26 26 30 34 G
H SHELL I.D.   IN 40 40 44 48 48 48 54 60 60 66 84 H
I SUPPLY HEIGHT   IN 55 1/4 55 3/8 59 3/4 63 5/8 66 5/8 66 5/8 74 3/4 81 3/4 81 3/4 90 3/4 109 I
J WIDTH WITHOUT TRIM   IN 45 1/4 45 1/4 50 53 5/8 53 5/8 53 5/8 60 66 1/2 66 1/2 72 1/2 90 3/4 J
K WIDTH WITH TRIM   IN 58 58 60 66 66 66 72 79 79 84 103 K
L SKID WIDTH   IN 34 34 36 40 40 40 44 48 48 51 64 L
M END OF SKID TO FRONT PLATE   IN 13 1/2 14 1/4 15 1/4 15 1/4 15 1/4 15 1/4 21 3/4 25 1/8 25 1/8 21 1/4 28 5/8 M
N VESSEL SHELL TO FLOOR   IN 12 12 12 12 12 12 14 15 15 18 18 N
O SKID LENGTH   IN 81 99 102 102 102 114 114 132 156 168 180 O
P STACK OUTLET HEIGHT   IN 58 5/8 58 5/8 62 5/8 66 5/8 66 5/8 66 5/8 74 3/4 81 3/4 81 3/4 90 3/4 109 P
Q BLOWDOWN LOCATIONS   IN 35 3/4 41 31 3/4 29 3/4 29 3/4 29 3/4 29 3/4-66 32 7/8-78 32 7/8-102 33 7/8-120 35 7/8-120 Q
R STEAM OUT LOCATION 15 PSI & UP IN 38 3/4 41 3/4 40 1/4 49 3/4 49 3/4 58 3/4 55 3/4 55 7/8 73 7/8 80 3/4 72 R
S SUPPLY LOCATION   IN 20 1/4 20 3/4 33 37 3/4 37 3/4 43 3/4 32 3/4 32 32 46 1/2 54 3/4 S
T RETURN LOCATION   IN 59 1/4 74 3/4 78 85 3/4 85 3/4 97 3/4 90 3/4 102 114 130 1/2 144 3/4 T
U BURNER PROJECTION FROM FRONT PLATE IN 31 5/8 31 5/8 31 3/8 31 3/8 31 3/8 31 3/8 31 3/8 34 3/4 34 3/4 34 3/4 47 1/2 U
V TUBE REMOVABLE FRONT IN 68 85 88 91 91 102 96 108 132 150 150 V
W STACK OUTLET LOCATION   IN 78 1/2 95 3/4 98 3/4 104 3/4 104 3/4 116 3/4 111 3/4 123 7/8 148 7/8 168 3/4 172 7/8 W
X APPROX. OVERALL LENGTH STD. BURNER IN 117 134 137 144 144 160 152 167 193 214 223 X
Y 1 1/4" SURFACE BLOW-OFF CONNECTION   IN 29 3/4 29 3/4 31 1/4 40 3/4 40 3/4 46 3/4 45 3/4 41 7/8 58 7/8 61 3/8 57 3/8 Y
  APPROX. SHIPPING WEIGHT 150 PSI LBS. 3500 4100 4500 5965 6200 6900 9500 10400 11800 16600 27100  
APPROX. SHIPPING WEIGHT 15 & 30 PSI LBS. 3400 4000 4500 5665 5900 6200 7200 9400 10800 13700 25600
WATER CAPACITY @ NWL   GAL. 213 300 315 400 381 436 484 676 785 1126 1874
WATER CAPACITY FLOODED   GAL. 250 323 385 453 455 499 578 788 1027 1350 2276
  BOILER HORSEPOWER 30 40 50 60 70 80 100 125 150 200 250  

BOILER SPECIFICATIONS (ALL DIMENSIONS ARE IN INCHES) - CONTINUED
 
BOILER HORSEPOWER
300 350 400 500 600 700 750 800 900 1000 1200 1500  
  HEATING SURFACE FIRESIDE SQ. FT. 1500 1750 2000 2500 3000 3500 3750 4000 4500 5000 6000 7500  
STEAM OUTPUT FROM & @212°F LB/HR 10350 12075 13800 17250 20700 24150 25875 27600 31050 34500 41400 51750
GROSS OUTPUT   MBH 10043 11716 13390 16738 20085 23432 25106 26780 30128 33475 40170 50213
FIRING RATE, GAS 1,000 BTU/CF CFH 12600 14700 16800 21000 25200 29400 31500 33600 37800 42000 50400 63000
FIRING RATE, LP GAS 91,500 BTU GPH 138 160 184 230 275 320 344 368 413 460 550 688
FIRING RATE, No.2 oil 140,00O BTU GPH 90 105 120 150 180 210 225 240 270 300 360 450
FIRING RATE, #5 & #6 OIL 150,000 BTU GPH 84 98 112 140 168 196 210 224 252 280 336 420
A *NOTE: 1 STEAM OUTLET SIZE 150 PSI IN 6 6 6 6 8 8 8 8 8 8 10 10 A
A *NOTE: 2 STEAM OUTLET SIZE 15 PSI IN 10 10 10 10 12 12 12 12 14 14 14 14 A
B *NOTE: 2 SUPPLY SIZE 30 PSI IN 10 10 10 10 12 12 12 12 12 12 14 14 B
C *NOTE: 2 RETURN SIZE 30 PSI IN 8 8 8 8 8 10 10 10 12 12 14 14 C
D FEEDWATER CONNECTION   IN 2 2 2 2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 2 1/2 D
E BOTTOM BLOWDOWN SIZE HIGH PRESS. IN 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2 2 2 2 2 2 2 2 E
E BOTTOM BLOWDOWN SIZE LOW PRESS. & HW IN 2 2 2 2 2 2 2 2 2 2 2 2 1/2 E
F STACK OUTLET SIZE O.D.   IN 20 20 24 24 28 28 28 30 30 30 32 32 F
G FURNACE O.D.   IN 34 34 38 38 44 52 52 52 52 52 56 56 G
H SHELL I.D.   IN 84 84 90 96 102 112 112 112 112 112 126 136 H
I SUPPLY HEIGHT   IN 109 109 115 121 127 1/4 138 1/4 138 1/4 138 1/4 138 1/4 138 1/4 152 1/4 162 1/4 I
J WIDTH WITHOUT TRIM   IN 90 3/4 90 3/4 96 1/4 102 3/4 108 3/4 119 119 119 119 119 133 1/2 143 1/2 J
K WIDTH WITH TRIM   IN 103 102 106 115 121 136 136 136 136 136 153 162 K
L SKID WIDTH   IN 64 64 70 76 78 92 92 92 92 92 108 114 L
M END OF SKID TO FRONT PLATE   IN 26 5/8 34 5/8 30 5/8 31 5/8 62 5/8 35 1/8 34 5/8 36 5/8 505/8 64 5/8 61 5/8 59 5/8 M
N VESSEL SHELL TO FLOOR   IN 18 18 18 18 18 18 18 18 18 18 18 18 N
O SKID LENGTH   IN 180 204 198 212 240 207 218 228 264 288 294 320 O
P STACK OUTLET HEIGHT   IN 109 109 115 122 128 1/4 138 1/4 138 1/4 138 1/4 138 1/4 138 1/4 152 1/4 162 1/2 P
Q BLOWDOWN LOCATIONS   IN 35 7/8-120 41 7/8-132 47 7/8-126 47 3/8-137 46 7/8-146 51 3/8-126 1/2 49 7/8-138 49 7/8-149 50 3/8-169 49 7/8-198 53 7/8-190 57 1/8-214 Q
R STEAM OUT LOCATION 15 PSI & UP IN 71 7/8 84 7/8 93 3/8 96 7/8 96 3/8 90 3/8 90 3/8 101 3/8 122 115 7/8 122 3/8 135 7/8 R
S SUPPLY LOCATION   IN 54 3/4 56 1/4 55 7/8 60 3/8 60 51 3/8 51 3/8 51 3/8 78 78 81 65 7/8 S
T RETURN LOCATION   IN 144 3/4 151 1/4 147 7/8 162 3/8 160 140 3/8 140 3/8 153 3/8 180 200 206 245 7/8 T
U BURNER PROJECTION FROM FRONT PLATE IN 47 1/2 38 1/4 52 1/4 52 1/4 52 1/4 52 3/4 52 3/4 65 7/8 65 7/8 65 7/8 63 76 U
V TUBE REMOVABLE FRONT IN 150 168 168 184 191 173 185 195 217 239 239 264 V
W STACK OUTLET LOCATION   IN 172 7/8 190 7/8 192 7/8 208 7/8 222 5/8 201 1/2 214 225 7/8 247 7/8 269 7/8 270 7/8 298 7/8 W
X APPROX. OVERALL LENGTH STD. BURNER IN 223 241 259 275 306 271 283 309 331 353 352 393 3/8 X
Y 1 1/4" SURFACE BLOW-OFF CONNECTION   IN 57 3/4 68 7/8 68 3/8 72 7/8 72 3/8 75 3/8 74 3/8 86 3/8 102 85 7/8 106 3/8 107 7/8 Y
  APPROX. SHIPPING WEIGHT 150 PSI LBS. 27100 30200 32200 37900 46400 48100 54100 57200 61300 66400 82000 103000  
APPROX. SHIPPING WEIGHT 15 & 30 PSI LBS. 25800 28200 29500 34400 37400 40100 42500 44900 49700 54600 74000 93000
WATER CAPACITY @ NWL   GAL. 1844 2068 2440 3075 3315 3341 3566 3791 4170 4640 6055 7743
WATER CAPACITY FLOODED   GAL. 2246 2518 3000 3423 4076 3983 4253 4523 4970 5525 7295 10069
 
BOILER HORSEPOWER
300 350 400 500 600 700 750 800 900 1000 1200 1500  




For further information, you can visit Hurst Boiler Website

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