BOILER & WELDING CO., INC.

SERIES 400
3-PASS SCOTCH MARINE DESIGNwith
HIGH PRESSURE BOILER
Capacities From 30 to 1500 BHP.
Wetback Construction 1004 to 50213 MBTU/HR.

STEAM
Pressures to 15-300 PSI.

HOT WATER
Section I and Section IV

“Wet back design eliminates, costly

deteriorating refractory rear doors and
SKID MOUNTED
baffles between flue gas passes.”
MODULAR PACKAGED
SERIES 400

SEMI WET BACK

BOILER SPECIFICATIONS
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° LBS/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 OIL #2 140,000 BTU GPH 9 12 15 18 21 24 29.9 37.4 45 60 75
FIRING RATE OIL #5 & #6 150,000 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 WATER SUPPLY SIZE 30 PSI IN 4 4 4 6 6 6 8 8 8 8 10 B
C *NOTE: 2 WATER RETURN SIZE 30 PSI IN 4 4 4 4 4 4 6 6 6 6 8 C
D FEEDWATER CONNECTION SIZE 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 BLOWDOWN CONNECTION (BTM) 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 BLOWDOWN CONNECTION (BTM) 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 1 1/2 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 32 G
H SHELL I.D. IN 40 40 44 48 48 48 54 60 60 66 72 H
I SUPPLY HEIGHT IN 55 1/4 55 3/8 59 3/4 63 3/4 66 5/8 66 5/8 74 5/8 81 3/4 81 3/4 90 3/4 93 3/4 I
J WIDTH WITHOUT TRIM IN 46 46 50 54 5/8 54 5/8 54 5/8 60 66 1/2 66 1/2 72 1/2 78 1/2 J
K WIDTH WITH TRIM IN 58 58 60 66 66 66 72 79 79 84 92 K
L SKID WIDTH IN 34 34 36 40 40 40 44 48 48 51 57 L
M END OF SKID FROM FRT. PLATE IN 13 1/2 14 1/2 15 1/4 15 1/4 15 1/4 15 1/4 21 3/4 25 1/8 25 1/8 23 1/4 28 5/8 M
N SHELL TO FLOOR IN 12 12 12 12 12 12 14 15 15 18 15 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 5/8 81 3/4 81 3/4 90 3/4 93 3/4 P
Q BLOWDOWN LOCATION IN 35 3/4 41 31 3/4 29 3/4 29 3/4 29 3/4 29 3/4-50 32 7/8-56 32 7/8-80 31 7/8-98 33 7/8-98 Q
R STEAM OUTLET LOCATION 15 PSI & UP IN 38 3/8 41 3/4 40 1/4 49 3/4 49 3/4 58 3/4 55 34 55 7/8 73 7/8 78 3/8 70 R
S SUPPLY LOCATION IN 20 1/4 20 1/4 33 1/4 37 3/4 37 3/4 43 3/4 32 3/4 32 32 44 38 49 7/8 S
T RETURN LOCATION IN 59 1/4 74 1/4 78 1/4 85 3/4 85 3/4 97 3/4 90 3/4 102 114 128 3/8 139 7/8 T
U BURNER PROJECTION STND. BURNER IN 32 36 36 36 36 40.5 40.5 45 45 45 45 U
V TUBE REMOVAL FRONT IN 68 85 88 91 91 102 96 108 132 150 152 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 7/8 166 13/16 170 7/8 W
X APPROX. OVERALL LENGTH IN 118 139 142 149 149 167 163 179 205 223 229 X
Y CENTER LINE OF FURNACE TO FLOOR IN 27 5/16 27 5/16 28 13/16 31 5/16 31 5/16 31 5/16 29 13/16 33 3/4 33 3/4 38 3/8 35 3/8 Y
APPROX. SHIPPING WEIGHT 150 PSI LBS 3500 4100 4700 6450 6700 7150 8200 10400 11800 16600 18750
APPROX. SHIPPING WEIGHT. 15 & 30 PSI LBS 3400 4000 4500 5665 5900 6200 7200 9400 10800 13700 17750
WATER CAPACITY - STEAM NWL GALS 215 272 324 389 371 429 482 681 848 1126 1412
WATER CAPACITY - WATER FLOODED GALS 252 320 382 445 427 492 564 793 985 1350 1633
BOILER HORSEPOWER 30 40 50 60 70 80 100 125 150 200 250

NOTE:1 3”& ABOVE ARE 300# ANSI FLANGE. ALL DIMENSIONS ARE IN INCHES
NOTE:2 4” & ABOVE ARE 150# ANSI FLANGE. CERTIFIED DRAWING AVAILABLE UPON REQUEST.
NOTE: 100 HP & LARGER HAS 12” X 16” MANWAY DIMENSIONS SUBJECT TO CHANGE WITHOUT NOTICE.
 Inspected and
registered with the
National Board of
Boiler & Pressure
Vessel Inspectors.

Designed,
constructed and
stamped in
accordance with
the requirements
of the ASME
Boiler Codes.

300 350 400 500 600 700 750 800 900 1000 1200 1500
1500 1750 2000 2500 3000 3500 3750 4000 4500 5000 6000 7500
BOILER DESIGN: Three-Pass
10350 12075 13800 17250 20700 24150 25875 27600 31050 34500 41400 51750
“Scotch Marine” Firetube design with
10043 11716 13390 16738 20085 23432 25106 26780 30128 33475 40170 50213 stress relieving “Wetback” construc-
12600 14700 16800 21000 25200 29400 31500 33600 37800 42000 50400 63000 tion. Pressure designs for steam are:
138 160 184 230 275 320 344 368 413 460 550 688 30-150 HP. > 450 PSI max.
90 105 120 150 180 210 225 240 2770 300 360 450 200-300 HP. > 400 PSI max.
84 98 112 140 168 196 210 224 252 280 336 420 400-500 HP. > 350 PSI max.
A 6 6 6 6 8 8 8 8 8 8 10 10 A
500-600 HP. > 325 PSI max.
700-1000 HP. > 300 PSI max.
A 10 10 10 10 12 12 12 12 14 14 14 14 A
1200-1500 HP. > 250 PSI max.
B 10 10 10 10 12 12 12 12 12 12 14 14 B 1600-2000 HP. > 200 PSI max.
C 8 8 8 8 8 10 10 10 12 12 14 14 C Hot Water pressures models are
D 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 from 30-160 psi. High pressure, high
E 1 1/2 1 1/2 1 1/2 1 1/2 1 1/2 2 2 2 2 2 2 2 E temperature Section I hot water
E 2 2 2 2 2 2 2 2 2 2 2 2 E boilers available.
F 20 20 24 24 28 28 28 30 30 30 32 32 F Factory assembled with trim, tested,
G 34 34 38 38 44 52 52 52 52 52 56 56 G
ASME code, UL, and CSD-1 stan-
dards.
H 84 84 90 96 102 112 112 112 112 112 126 136 H
I 108 3/4 108 3/4 115 121 127 137 1/4 137 1/4 137 1/4 137 1/4 137 1/4 152 1/4 162 1/2 I STEAM MODEL TRIM: Safety relief
J 90 3/4 90 3/4 96 1/4 102 3/4 108 3/4 119 119 119 119 119 133 1/2 144 J valve, operating pressure control,
K 103 103 109 115 121 136 136 136 136 136 153 165 K high limit pressure control with
L 64 64 70 76 78 92 92 92 92 92 108 114 L manual reset, steam pressure gauge
M 30 5/8 35 5/8 32 5/8 32 5/8 52 5/8 35 1/8 34 5/8 36 5/8 49 5/8 49 5/8 55 5/8 59 1/2 M with syphon, combination pump
N 18 18 18 18 18 18 18 18 18 18 18 18 N control and low water cut-off with
O 180 204 198 212 240 207 218 228 264 288 294 320 O
gauge glass assembly and drain
valve, auxiliary low water cut-off with
P 108 3/4 108 3/4 115 122 138 1/4 138 1/4 138 1/4 138 1/4 138 1/4 138 1/4 152 1/4 162 1/2 P
manual reset.
Q 33 7/8-98 39 7/8-110 45 7/8-98 47 7/8-137 46 7/8-137 51 3/8-124 49 7/8-138 49 7/8-148 45 7/8-170 49 7/8-193 53 7/8-189 52 7/8-214 Q
R 69 3/8 82 7/8 91 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 HOT WATER MODEL TRIM: Safety
S 50 3/8 53 7/8 55 7/8 58 7/8 60 51 3/8 51 3/8 51 3/8 78 78 74 7/8 65 7/8 S relief valve, operating temperature
T 140 3/8 148 7/8 139 7/8 160 7/8 160 140 3/8 140 3/8 153 3/8 180 200 205 7/8 245 7/8 T control, high limit temperature control
U 46 48 54 57 62 62 62 62 67 67 83 83 U with manual reset, combination pres-
V 150 168 168 184 191 173 184 195 217 239 239 264 V sure & temperature gauge, low water
W 188 7/8 190 7/8 190 7/8 208 7/8 217 5/8 202 3/8 213 7/8 225 7/8 247 7/8 269 7/8 270 7/8 298 7/8 W
cut-off control with manual reset.
X 230 250 260 281 297 282 293 311 311 355 373 401 X
BURNER: Matched UL listed “forced
Y 41 41 43 1/2 44 1/4 47 1/2 50 1/4 50 1/4 50 1/4 50 1/4 50 1/4 52 5/8 53 Y draft” power burners with factory pre-
27100 30200 22000 37900 46400 48100 54100 57200 61300 66400 82000 103000 piped, wired and tested fuel configu-
25800 28200 29500 34400 37400 40100 42500 44900 44700 54600 74000 93000 rations for natural gas, propane (LP)
1773 2009 2230 2918 3193 3121 3347 3562 3996 4425 5459 6927
gas, No. 2 (diesel) oil, or combination
of both gas/oil.
2176 2461 2790 3627 4058 4043 4330 4605 5157 5706 7568 10205
300 350 400 500 600 700 750 800 900 1000 1200 1500
WET BACK ADVANTAGE
Dry backs boilers are subject to deteriorating
rear refractory, leaking baffles, leaking door WET-BACK DESIGN
seals, and often found with a heat-stressed
rear tube sheet. Fragile refractory baffling
and door seals will require continuous
monitoring, maintenance, and replacement,
costing thousands of dollars in materials and
specialized labor costs over the life of the
boiler. In addition, broken baffles and leaking
seals will short-circuit the boiler’s gas flow,
causing high stack temperatures and low-
ering efficiency until repairs can be made.
This can bring your production process to a
costly halt.
All of those frustrating problems have 3- PASS
been designed out of the Hurst Series 400 WATER WALL
TURN-AROUND
Wet back. It has a full wet back radiant heat
transfer area that promotes superior internal
water circulation and rapid heat absorption. Separate rear tube sheets 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 manway plug which allows access to the furnace for inspection.

Stress Relieving “Wet Back” Construction for Extended Life

STANDARD STEAM TRIM STANDARD WATER TRIM

Operating & high limit pressure control Operating & high limit temperature control

Modulating pressure control (when appl.) Modulating temperature control (when appl.)

Water column with gauge glass, combination Probe type low water cut-off control w/
low water cut-off & pump control Manual Reset

Probe Aux, L.W.C.O. w/ Manual Reset Combination pressure & temperature gauge
Steam pressure gauge, syphon & test cock
Hot water return baffle for shock resistance
Stack Thermometer, Water column
drain valve Safety relief valve(s) per ASME Code

Safety relief valve(s) per ASME Code Stack Thermometer

HBC-09507
07/2014

HURST BOILER
& Welding Co., Inc.