US Patent Class 122
LIQUID HEATERS AND VAPORIZERS




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Current as of: June, 1999
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  DF  CLASS NOTES
1 R  DF  PLANTS
2  DF  .~ Garbage
3  DF  .~ Motor vehicle
1 A  DF  .~ Air heaters
1 B  DF  .~ Once through
1 C  DF  .~ Feed water heaters
4 R  DF  MISCELLANEOUS
4 A  DF  .~ Electric boiler
4 C  DF  .~ Water-cooled stoker
4 D  DF  .~ Catalyst
5  DF  GAS-PRODUCER
5.51  DF  AIR-INJECTED
5.52  DF  .~ Combustion gas and vapor contact
6 R  DF  INDUSTRIAL
6.5  DF  .~ Port
6.6  DF  .~ Tuyeres
6.7  DF  .~.~ Forge
7 R  DF  .~ Waste heat
7 A  DF  .~.~ Steel converter
7 B  DF  .~.~ Additional burner
7 C  DF  .~.~ Waste sulfite
7 D  DF  .~.~ Carbon monoxide
8  DF  .~ Water firebox
9  DF  .~.~ Water tube type
6 A  DF  .~ Water-cooled walls
6 B  DF  .~ Bosh plates
6 C  DF  .~ Skew arch coolers
10  DF  FOR FLUID FUEL BURNER
11  DF  ROTARY
12  DF  ROTATABLY SUPPORTED
13.1  DF  STAND BOILER
13.2  DF  .~ Electric
*  DD  .~ Fire tube and water tube
16  DF  .~.~ Fluid fuel
*  DD  .~ Fire tube
17  DF  .~.~ Fluid fuel
*  DD  .~ Water tube
*  DD  .~.~ Below boiler
18  DF  .~.~.~ Fluid fuel
*  DD  .~.~ Casing
19  DF  .~.~.~ Fluid fuel
14  DF  .~ Fluid fuel
15  DF  .~ Solid fuel
20 R  DF  SUBSIDIARY
20 A  DF  .~ Subsidiary-heater firebox
20 B  DF  .~ Subsidiary-heater offtake flue
29  DF  ANNULAR FIREBOX
30  DF  MAGAZINE
*  DD  INDIRECTLY HEATED
*  DD  .~ Separate fluid
32  DF  .~.~ Surface
33  DF  .~.~.~ Furnace
34  DF  .~.~.~ Separator
31.1  DF  INDIRECTLY HEATED SEPARATE INJECTED FLUID
31.2  DF  .~ Submerged flame
35  DF  ACCUMULATOR
36  DF  AUXILIARY STEAM HEATER
37  DF  COMPARTMENT
*  DD  .~ Auxiliary
38  DF  .~.~ Draft regulator
39  DF  FILM
40  DF  FLASHER
41  DF  .~ Fluid fuel
42  DF  FIRE AND WATER TUBE
43  DF  .~ Fluid fuel
44.1  DF  FIRE TUBE
44.2  DF  .~ With baffle in flue
49  DF  .~ Horizontal and vertical
*  DD  .~ Horizontal or inclined
*  DD  .~.~ Water firebox
50  DF  .~.~.~ Flue
51  DF  .~ Horizontal
52  DF  .~.~ Plural
53  DF  .~.~.~ Water tube
*  DD  .~.~ Central firebox
54  DF  .~.~.~ Double outlet
55  DF  .~.~ Cylinder
*  DD  .~.~ Depending fire tube
56  DF  .~.~.~ Rear of bridge wall
*  DD  .~.~ Double water firebox
57  DF  .~.~.~ Alternate smoke return
58 R  DF  .~.~ Drop water firebox
59  DF  .~.~.~ Circulation conduit
*  DD  .~.~.~ Double
60  DF  .~.~.~.~ Alternate smoke return
61  DF  .~.~.~ Drop water baffle
62  DF  .~.~.~ Front and rear water baffle
63  DF  .~.~.~ Front water baffle
64  DF  .~.~.~ Interposed combustion chamber
65  DF  .~.~.~ Rear water baffle
66  DF  .~.~.~ Water coking chamber
*  DD  .~.~.~ Water grate
67  DF  .~.~.~.~ Intermediate draft
68  DF  .~.~.~ Water tube
*  DD  .~.~.~.~ Feed heater
69  DF  .~.~.~.~.~ Check-valved
70  DF  .~.~.~.~ Feeding air
71  DF  .~.~.~.~ Solid baffle
58 FB  DF  .~.~.~ Fire box construction
72  DF  .~.~ Projecting into firebox
73  DF  .~.~.~ Drop water firebox
*  DD  .~.~ Return and reverse
74  DF  .~.~.~ Drop water firebox
75  DF  .~.~ Return fire tube
76  DF  .~.~.~ Drop water firebox
77  DF  .~.~.~.~ Internal water tube
*  DD  .~.~.~ Water firebox
78  DF  .~.~.~.~ Flue
79  DF  .~.~ Subjacent water arch
80  DF  .~.~ Subjacent flue
81  DF  .~.~ Subjacent transverse fire tube
*  DD  .~.~ Superjacent feed heater
82  DF  .~.~.~ In communication
83  DF  .~.~ Transverse diaphragm
*  DD  .~.~ Two diameters
84  DF  .~.~.~ Great diameter over firebox
85  DF  .~.~.~ Small diameter over firebox
86  DF  .~.~.~.~ Water firebox
87  DF  .~.~ U-coupling
88  DF  .~.~ Upper drum
*  DD  .~.~ Water arch
89  DF  .~.~.~ Rear of fire tube
90  DF  .~.~ Water firebox
*  DD  .~.~.~ Firebox water heater
91  DF  .~.~.~.~ Trapped circuit
92  DF  .~.~.~ Magazine
93  DF  .~.~.~ Offset
94.1  DF  .~.~.~.~ Water tube type
95.1  DF  .~.~.~ Plural with common combustion chamber
95.2  DF  .~.~.~.~ Multiboilers
96  DF  .~.~.~ Superposed
*  DD  .~.~.~ Water grate
97  DF  .~.~.~.~ Downdraft
98  DF  .~.~.~.~ Updraft
*  DD  .~.~.~ Water tube
99  DF  .~.~.~.~ Straddle
*  DD  .~.~.~ Water tube type
100  DF  .~.~.~.~ Interposed flue
101  DF  .~.~ Water smoke box
*  DD  .~.~ Water tube
*  DD  .~.~.~ Horizontal
102  DF  .~.~.~.~ Over bridge wall
103  DF  .~.~.~ Rear of fire tube
*  DD  .~.~.~ Rearwardly declined
104  DF  .~.~.~.~ Over bridge wall
*  DD  .~.~.~ Rearwardly inclined
105  DF  .~.~.~.~ Over bridge wall
106  DF  .~.~ Water wall
107  DF  .~.~.~ Drop water firebox
108  DF  .~.~.~ Subjacent water tube
109  DF  .~ Inclined
*  DD  .~ Transverse
110  DF  .~.~ Horizontal boiler
111  DF  .~.~ Vertical boiler
112  DF  .~.~.~ Water firebox
113  DF  .~.~ Water tube
114  DF  .~ Vertical
116  DF  .~.~ Central fire dome
117  DF  .~.~ Central magazine
*  DD  .~.~ Circulation tube
118  DF  .~.~.~ Internal
119  DF  .~.~ Cylinder
120  DF  .~.~ Offset firebox
121  DF  .~.~ Return fire tube
122  DF  .~.~.~ Water firebox
123  DF  .~.~ Separate compartment
124  DF  .~.~ Side magazine
125  DF  .~.~ Top water chamber
126  DF  .~.~ Water firebox
127  DF  .~.~.~ Annular
128  DF  .~.~.~ Central magazine
*  DD  .~.~ Water grate
129  DF  .~.~.~ Downdraft
130  DF  .~.~ Water tube
131  DF  .~.~.~ Internal
132  DF  .~.~.~ Radial loop
133  DF  .~.~.~ Spur
115  DF  .~.~ Fluid fuel
134  DF  .~ Volute
46  DF  .~ Magazine
*  DD  .~ Flue
47  DF  .~.~ Horizontal
48  DF  .~.~ Vertical
45  DF  .~ Fluid fuel
135.1  DF  FLUE
135.2  DF  .~ Alternative stack
135.3  DF  .~ Sinusoidal flue
136 R  DF  .~ Horizontal
137  DF  .~.~ Plural
138  DF  .~.~.~ Water tube
139  DF  .~.~ Drop water firebox
140.1  DF  .~.~ Internal water tube
140.2  DF  .~.~.~ Having water tube in flue
*  DD  .~.~.~ Longitudinal
141  DF  .~.~.~.~ Drop water firebox
142  DF  .~.~.~ Return fire tube
143  DF  .~.~.~ Spur
144  DF  .~.~.~ Subjacent firebox
145  DF  .~.~.~ Transverse
146  DF  .~.~.~.~ Drop water firebox
147  DF  .~.~.~.~ Return fire tube
148  DF  .~.~.~ Water firebox
149  DF  .~.~ Return fire tube
150  DF  .~.~.~ Rear water tube
*  DD  .~.~.~ Water smoke box
151  DF  .~.~.~.~ Separate
152  DF  .~.~ Water grate in flue
153  DF  .~.~ Water tube
154  DF  .~.~.~ Over bridge wall
136 C  DF  .~.~ Horizontal-corrugated or finned
155.1  DF  .~ Vertical
155.2  DF  .~.~ With flue baffle
155.3  DF  .~.~ Having exterior heating flue
155.4  DF  .~.~ Having corrugated flue
155.5  DF  .~.~ Having undulating flue
157  DF  .~.~ Central magazine
158  DF  .~.~.~ Water jacket
*  DD  .~.~ Circulation tube
159  DF  .~.~.~ Internal
160  DF  .~.~ Concentric shell
161  DF  .~.~.~ Fluid fuel
162  DF  .~.~.~ Central magazine
163  DF  .~.~ Exterior drum
165  DF  .~.~ Internal water heater
166.1  DF  .~.~ With internal water tube
166.2  DF  .~.~.~ Loop-type tube
168  DF  .~.~.~ Central magazine
169  DF  .~.~.~ Coil
170  DF  .~.~.~.~ Header
171  DF  .~.~.~ Contracted inlet
172  DF  .~.~.~ Header
173  DF  .~.~.~ Horizontal spur
174  DF  .~.~.~ Internal fire tube
175  DF  .~.~.~ Offset water firebox
176  DF  .~.~.~ Transverse
177  DF  .~.~.~.~ Fluid fuel
178  DF  .~.~.~ Vertical aligned fire tube
179  DF  .~.~.~.~ Fluid fuel
180  DF  .~.~.~.~ Spur water tube
181  DF  .~.~.~ Vertical spur
167  DF  .~.~.~ Fluid fuel
182.1  DF  .~.~ With return fire tube
182.2  DF  .~.~.~ Having symmetrical arrangement of tubes
182.3  DF  .~.~.~ Having tubes offset from firebox
*  DD  .~.~ Spiral water conduit
183  DF  .~.~.~ Fluid fuel
*  DD  .~.~ Standpipe
*  DD  .~.~.~ Water tube
184  DF  .~.~.~.~ Annular firebox
185  DF  .~.~.~.~ Loop
186  DF  .~.~.~.~ Spur
187  DF  .~.~ Transverse fire tube
164  DF  .~.~ Insulated outlet flue
156  DF  .~.~ Fluid fuel
*  DD  HORIZONTAL CYLINDER
188  DF  .~ Drop water baffle
*  DD  .~ Offset subjacent firebox
189  DF  .~.~ Water roof
190  DF  .~.~ Water tube
*  DD  .~ Subjacent fire tube
191  DF  .~.~ Beyond bridge wall
192  DF  .~ Water bridge wall
193  DF  .~ Water firebox
194  DF  .~.~ Water tube type
195  DF  .~ Water tube
*  DD  .~.~ Feed heater
196  DF  .~.~.~ Check-valved
197  DF  .~.~ Lateral-longitudinal
198  DF  .~.~ Lateral-vertical
199  DF  .~.~.~ Firebox
200  DF  .~.~ Over fuel grate
201  DF  .~.~ Subjacent internal fire tube
202  DF  .~.~ Trapped circuit
*  DD  .~.~ Water grate
203  DF  .~.~.~ Downdraft
204  DF  .~.~.~ Intermediate draft
205  DF  .~.~.~ Multiple series
206  DF  .~.~.~ Solid and water bar
207  DF  .~.~.~ Updraft
*  DD  PLATE
*  DD  .~ Zigzag conduit
208  DF  .~.~ Fluid fuel
209.1  DF  SECTIONAL
209.2  DF  .~ Feeding air
213  DF  .~ Plural firebox
*  DD  .~ Horizontal sections
214  DF  .~.~ Superimposed
215  DF  .~.~.~ Central connection
216  DF  .~.~.~.~ Fluid fuel
217  DF  .~.~.~.~ Water firebox
218  DF  .~.~.~ Water firebox
219  DF  .~.~.~.~ Central magazine
*  DD  .~.~.~ Water tube
*  DD  .~.~.~.~ Internal fire tube
220  DF  .~.~.~.~.~ Water firebox
*  DD  .~ Vertical sections
221  DF  .~.~ Annularly positioned
222  DF  .~.~.~ Central magazine
223  DF  .~.~ Longitudinally positioned
224  DF  .~.~.~ Casing
225 R  DF  .~.~ Transversely positioned
226  DF  .~.~.~ Casing
227  DF  .~.~.~.~ Divided section
228  DF  .~.~.~ Divided section
229  DF  .~.~.~ Water grate
225 A  DF  .~.~.~ Water heater in flue
225 B  DF  .~.~.~ Water heater in boiler
225 F  DF  .~.~.~ Feeding air
230  DF  .~.~ Two-section
212.1  DF  .~ With magazine
212.2  DF  .~.~ With return or alternate flue
211  DF  .~ Fluid or solid fuel
210  DF  .~ Fluid fuel
232  DF  .~ Water grate
231  DF  .~ Accessories
*  DD  TANK
233  DF  .~ Horizontal
234  DF  .~ Vertical
235.11  DF  WATER TUBE
235.12  DF  .~ Wall structure
235.13  DF  .~ With fuel burners having posts and tuyeres
235.14  DF  .~ Tube structure
235.15  DF  .~ Headers and connections
235.16  DF  .~ For plural fluids
235.17  DF  .~ Having baffles
235.18  DF  .~ Having seals
235.19  DF  .~ D-type tube
235.21  DF  .~.~ Multiple D-type tubes
235.22  DF  .~ Wall loop
235.23  DF  .~ Having specific tube patterns
235.24  DF  .~ Screens
235.25  DF  .~.~ Floor screens
235.26  DF  .~ Having slag and ash disposal
235.27  DF  .~ Locomotive-type
235.28  DF  .~ Having rotary flame
235.29  DF  .~ Having forced circulation system
235.31  DF  .~ Having specific intenal drum and head structure
235.32  DF  .~ With combustion
235.33  DF  .~ With convection zone regulation
235.34  DF  .~ With parallel multiple fireboxes
235.35  DF  .~ With serial multiple fireboxes
238  DF  .~ Offset firebox
239  DF  .~ Superimposed firebox
240.1  DF  .~ Having plural fireboxes
240.2  DF  .~.~ Series connected
240.3  DF  .~.~ Parallel connected
241  DF  .~ Firebox in drum
242  DF  .~ Capillary
243  DF  .~.~ Fluid fuel
*  DD  .~ Coil or loop
244  DF  .~.~ Central standpipe
245  DF  .~.~.~ Fluid fuel
246  DF  .~.~.~ Annular firebox
247  DF  .~ Coil
*  DD  .~.~ Horizontal
248  DF  .~.~.~ Fluid fuel
249  DF  .~.~ Vertical
250 R  DF  .~.~.~ Fluid fuel
250 S  DF  .~.~.~.~ Standpipe
251  DF  .~.~.~ Central magazine
252  DF  .~.~.~ Water firebox
253  DF  .~ Cross
254  DF  .~.~ Over bridge wall
*  DD  .~.~ Over firebox
*  DD  .~.~.~ Longitudinal
*  DD  .~.~.~.~ Header
255  DF  .~.~.~.~.~ Drum
*  DD  .~.~.~ Transverse
*  DD  .~.~.~.~ Header
256  DF  .~.~.~.~.~ Drum
*  DD  .~.~ Transverse
*  DD  .~.~.~ Header
257  DF  .~.~.~.~ Drum
258  DF  .~ Downflow
259  DF  .~ Drum type
260  DF  .~ Flat
261  DF  .~.~ Volute
262  DF  .~ Horizontal
263  DF  .~.~ Over bridge wall
264  DF  .~.~ Over firebox
265  DF  .~ Inclined
266  DF  .~ Internal fire tube
267  DF  .~.~ Horizontal
268  DF  .~.~ Inclined
269  DF  .~.~ Plural fire tube
270  DF  .~.~ Straddle
271  DF  .~.~ Vertical
272  DF  .~.~.~ Central magazine
273  DF  .~ Longitudinal upper drum
274  DF  .~.~ Fluid fuel
275  DF  .~ Loop
276  DF  .~.~ Firebox enclosing
277  DF  .~.~ Over bridge wall
*  DD  .~.~ Over firebox
278  DF  .~.~.~ Cross
279  DF  .~.~.~ Horizontal
*  DD  .~.~.~ Rear of bridge wall
280  DF  .~.~.~.~ Bridge wall header
281  DF  .~.~.~ Standpipe
282  DF  .~.~.~ Vertical
283  DF  .~.~.~.~ Fluid fuel
*  DD  .~ Over bridge wall
284  DF  .~.~ Headers at right angles
285  DF  .~.~ Transverse water baffle
*  DD  .~.~ Water grate
286  DF  .~.~.~ Downdraft
287  DF  .~.~.~ Intermediate draft
*  DD  .~ Over firebox
288  DF  .~.~ Headers at right angles
*  DD  .~.~ Water grate
289  DF  .~.~.~ Updraft
*  DD  .~ Rearwardly declined
*  DD  .~.~ Over bridge wall
290  DF  .~.~.~ Front and rear header
291  DF  .~.~.~.~ Horizontal-longitudinal drum
292  DF  .~.~.~.~.~ Firebox tube
293  DF  .~.~.~.~.~ Longitudinal water baffle
294  DF  .~.~.~.~.~ Water wall
295  DF  .~.~.~.~ Internal water tube
296  DF  .~.~.~.~ Longitudinal-declined drum
297  DF  .~.~.~.~ Transverse drum
*  DD  .~.~ Over firebox
*  DD  .~.~.~ Front and rear header
298  DF  .~.~.~.~ Horizontal-longitudinal drum
299  DF  .~.~.~.~ Transverse drum
300  DF  .~.~.~.~ Tubes beyond side wall
*  DD  .~.~ Plural upper transverse drum
301  DF  .~.~.~ Plural lower transverse drum
302  DF  .~.~.~ Single lower transverse drum
*  DD  .~ Rearwardly inclined
*  DD  .~.~ Over firebox
*  DD  .~.~.~ Front and rear header
303  DF  .~.~.~.~ Transverse drum
*  DD  .~ Separate banks
304  DF  .~.~ Opposite fireboxes
305  DF  .~ Spur
306  DF  .~.~ Bridge wall header
307  DF  .~.~ Central standpipe
308  DF  .~.~.~ Fluid fuel
309  DF  .~.~.~ Annular firebox
310  DF  .~.~.~ Central magazine
311  DF  .~.~ Cross
312  DF  .~.~ Horizontal-longitudinal drum
313  DF  .~.~ Over bridge wall
*  DD  .~.~ Over firebox
314  DF  .~.~.~ Central header
315  DF  .~.~.~ Declined
316  DF  .~.~.~ Horizontal
317  DF  .~.~ Straddle
318  DF  .~.~ Vertical
319  DF  .~.~.~ Fluid fuel
320  DF  .~.~.~ Central magazine
321  DF  .~ Standpipe
322  DF  .~.~ Fluid fuel
323  DF  .~.~ Annular firebox
324  DF  .~ Straddle
*  DD  .~.~ Plural upper drum
325  DF  .~.~.~ Plural lower drum
326  DF  .~.~.~.~ Cross
*  DD  .~.~ Single upper drum
327  DF  .~.~.~ Plural lower drum
328  DF  .~.~.~.~ Fluid fuel
329  DF  .~.~.~.~ Cross
330  DF  .~.~.~.~ Plural firebox
331  DF  .~ Transverse horizontal drum
332  DF  .~ Vertical
333  DF  .~.~ Fluid fuel
334  DF  .~.~ Side magazine
335  DF  .~.~ Annular firebox
336  DF  .~.~ Offset firebox
337  DF  .~.~.~ Elevated
*  DD  .~.~ Annular lower drum
338  DF  .~.~.~ Annular upper drum
339  DF  .~.~.~.~ Central magazine
340  DF  .~.~.~.~ Tubes over firebox
341  DF  .~.~.~ Fire tube upper drum
342  DF  .~.~.~ Spur tube upper drum
343  DF  .~.~.~ Upper drum
344  DF  .~.~.~.~ Central magazine
345  DF  .~.~ Beyond bridge wall
346  DF  .~.~.~ Gas return
*  DD  .~.~.~ Longitudinal upper drum
347  DF  .~.~.~.~ Longitudinal lower drum
*  DD  .~.~ Internal fire tube
348  DF  .~.~.~ Fluid fuel
349  DF  .~.~ Over firebox
350  DF  .~.~.~ Gas return
*  DD  .~.~ Plural upper longitudinal drum
351  DF  .~.~.~ Plural lower longitudinal drum
*  DD  .~.~ Plural upper transverse drum
*  DD  .~.~.~ Plural lower transverse drum
352  DF  .~.~.~.~ Offset firebox
353  DF  .~ Water grate
354  DF  .~.~ Downdraft
355  DF  .~ Zigzag
356  DF  .~.~ Fluid fuel
*  DD  .~.~ Over bridge wall
357  DF  .~.~.~ Longitudinal drum
358  DF  .~.~.~ Transverse drum
359  DF  .~.~ Over firebox
237  DF  .~ Magazine
236  DF  .~ Fluid fuel
*  DD  .~ Headers
360  DF  .~.~ Closures and couplings
361  DF  .~.~.~ Cleaning
362  DF  .~.~.~ Concentric tube
363  DF  .~.~.~ Drum
364  DF  .~.~.~ Tube closures
365  DF  .~ Drums and couplings
366  DF  WICK
367.1  DF  HEAT TRANSMITTER
367.2  DF  .~ Double immersed heat transmitters
367.3  DF  .~ Corrugated and finned heat transmitters
367.4  DF  .~ Pebble furnaces
368  DF  WATER FIREBOX
369  DF  .~ Mud ring
370  DF  .~ Plural
371  DF  WATER GRATE
*  DD  .~ Plural firebox
*  DD  .~.~ Superimposed
*  DD  .~.~.~ Water grate
372  DF  .~.~.~.~ Updraft
373  DF  .~ Cage
374  DF  .~ Grate structure
375  DF  .~.~ Solid and water bar
376  DF  .~ Progressive feed
*  DD  .~ Water firebox
*  DD  .~.~ Solid and water bar
377  DF  .~.~.~ Updraft
378  DF  .~.~ Updraft
21  DF  CHEMICAL
22  DF  FLUID AND SOLID FUEL
23  DF  FLUID FUEL
24  DF  .~ Explosion
*  DD  .~ Plural burner
25  DF  .~.~ Superimposed
26  DF  FRICTION GENERATOR
*  DD  NONCOMBUSTIBLE HEATER
27  DF  .~ Surface
28  DF  .~ Water in contact
379  DF  CLEANING
380  DF  .~ Agitating circulator
*  DD  .~ Blow off
381  DF  .~.~ Bottom and surface
382  DF  .~.~ Bottom
383  DF  .~.~.~ Internal conduit
384  DF  .~.~.~.~ Ejector
385  DF  .~.~.~.~ Mud ring
386  DF  .~.~.~.~ Pan
387  DF  .~.~.~.~ Scraper
388  DF  .~.~.~.~ Valved
389  DF  .~.~ Surface exit
390  DF  .~ Fluid jet
391  DF  .~.~ Horizontal fire tube boiler
392  DF  .~.~ Water tube boiler
393  DF  .~ Mud drum
394  DF  .~ Pans
395  DF  .~ Sandblast
396  DF  .~ Systems
397  DF  .~ Trapped circuit
398  DF  .~.~ Feeding water
399  DF  .~.~ Surface and bottom exit
400  DF  .~.~ Surface exit
401  DF  .~.~.~ Chemical feeder
402  DF  .~.~.~ Circulating pump
403  DF  .~.~.~ Feed heater
404  DF  .~.~.~ Steam injector
405  DF  .~ Wash-out nozzle
406.1  DF  CIRCULATION
406.2  DF  .~ Having anticavitation devices
406.3  DF  .~ Having restrictors and orifices
406.4  DF  .~ Once through
406.5  DF  .~ With start-up operations
407  DF  .~ Injector
408.1  DF  .~ Having internal conduit
408.2  DF  .~.~ With internal geyser tube
409  DF  .~.~ Horizontal flue boiler
410  DF  .~.~.~ Return fire tube
*  DD  .~ Mechanical
411  DF  .~.~ Internal
412  DF  FEED HEATERS
413  DF  .~ Ash pan
*  DD  .~ Boiler circuit
414  DF  .~.~ Feed-injected
*  DD  .~ Circulatioon
*  DD  .~.~ Surface exit
*  DD  .~.~.~ Mechanical pump
415  DF  .~.~.~.~ Feed-injected
417  DF  .~ Drip plate in boiler
*  DD  .~ Fire-engine boiler
*  DD  .~.~ Auxiliary
418  DF  .~.~.~ Attached
419  DF  .~.~.~ Detachable
420  DF  .~ Furnace gases
421  DF  .~ Offtake flue
422  DF  .~ Furnace gases and steam
*  DD  .~ Horizontal fire tube boiler
423  DF  .~.~ Smoke box
424  DF  .~.~.~ Exhaust pipe
425  DF  .~.~.~ Furnace gases and steam
426  DF  .~.~.~ Water tube
427  DF  .~.~ Smoke chamber
428  DF  .~ Internal conduit
429  DF  .~.~ Automatic sediment valve
430  DF  .~.~ Blow-off delivery
431  DF  .~.~ Filter in boiler
432  DF  .~.~ Furnace gases
433  DF  .~.~ Trap outside boiler
434  DF  .~ Locomotive tender
435  DF  .~ Pan in steam space
436  DF  .~.~ Spray
437  DF  .~ Safety valve
438  DF  .~ Spray to steam space
439  DF  .~ Stack
441  DF  .~ Steam
442  DF  .~.~ Injected
*  DD  .~.~.~ Superposed
443  DF  .~.~.~.~ Open to steam space
444  DF  .~ Water tube boiler
*  DD  REGULATION
*  DD  .~ Fuel and water
446  DF  .~.~ Fluid fuel
447  DF  .~.~.~ Cutoff
*  DD  .~.~ Automatic control
449  DF  .~.~.~ Solid fuel
450  DF  .~ Suspended boiler
448.1  DF  AUTOMATIC CONTROL OF FLUID FUEL AND WATER
448.2  DF  .~ Having fuel or feed bypass
448.3  DF  .~ Multiple boiler regulation
448.4  DF  .~ Once through
451 R  DF  FEEDERS
451.1  DF  .~ Automatic
451.1  DF  .~.~ Thermally controlled
451.2  DF  .~.~.~ Pressure-operated valve
452  DF  .~ Boiler pressure
*  DD  .~ Gravity
456  DF  .~.~ Automatic
457  DF  .~.~.~ Heater
458  DF  .~.~ Heater
451 S  DF  .~ Once through
459  DF  STEAM TREATMENT
460  DF  .~ Boilers with superheaters
*  DD  .~ Fire tube boiler
*  DD  .~.~ Horizontal
461  DF  .~.~.~ Superheater
*  DD  .~.~.~.~ In fire tube
462  DF  .~.~.~.~.~ From smoke box
*  DD  .~.~.~.~ Interior steam space
463  DF  .~.~.~.~.~ Internal fire tube
*  DD  .~.~.~.~ Smoke box
464  DF  .~.~.~.~.~ Fire tube
465  DF  .~.~.~.~.~ Steam tube
466  DF  .~.~ Superheater and feed heater
*  DD  .~.~ Vertical
467  DF  .~.~.~ Superheater
*  DD  .~ Flue boiler
*  DD  .~.~ Vertical
*  DD  .~.~.~ Internal water tube
468  DF  .~.~.~.~ Superheater
*  DD  .~ Horizontal boiler
*  DD  .~.~ Superheater
469  DF  .~.~.~ Rear of firebox
470  DF  .~.~.~ Waste-heat flue
*  DD  .~ Water tube boiler
*  DD  .~.~ Declined over bridge wall
*  DD  .~.~.~ Front and rear header
*  DD  .~.~.~.~ Declined drum
471  DF  .~.~.~.~.~ Superheater
*  DD  .~.~.~.~ Longitudinal drum
472  DF  .~.~.~.~.~ Superheater
*  DD  .~.~ Longitudinal drum
473  DF  .~.~.~ Superheater
*  DD  .~.~ Over bridge wall
474  DF  .~.~.~ Superheater
*  DD  .~.~ Standpipe
*  DD  .~.~.~ Spur tube
475  DF  .~.~.~.~ Superheater
*  DD  .~.~ Transverse drum
478  DF  .~.~.~ Superheater
477  DF  .~.~ Superheater and feed heater
476  DF  .~.~ Superheater
*  DD  .~ Superheater
480  DF  .~.~ Damper-controlled
481  DF  .~.~ Firebox
482  DF  .~.~ Fire tube in steam space
483  DF  .~.~ Indirectly heated
484  DF  .~.~ Separate charges
485  DF  .~.~ Separate furnace
486  DF  .~.~ Steam dome
487  DF  .~.~ Water-injected
479.1  DF  .~ Automatic heat regulation of superheater
479.2  DF  .~.~ Having gas recirculation
479.3  DF  .~.~ Having flame positioning
479.4  DF  .~.~ With variable firing
479.5  DF  .~.~ Having dampers
479.6  DF  .~.~ Plural furnaces
479.7  DF  .~.~ Once through
*  DD  SEPARATORS
488  DF  .~ Boiler circulation
489  DF  .~ Boiler return
490  DF  .~ For tilting boilers
491  DF  .~ Interior of boilers
492  DF  .~ Steam dome
493  DF  BRACES AND STAYS
494  DF  CASINGS
495  DF  CROWN SHEETS PROTECTING
496  DF  CROWN SHEETS AND STAYS
497  DF  FRONTS
498  DF  .~ Doors
499  DF  .~ Mouths
500  DF  .~.~ Water firebox
501  DF  FLUID-DISPLACER
502  DF  .~ Fluid fuel
503  DF  FUEL BAFFLES
504  DF  SAFETY DEVICES
504.1  DF  .~ Fusible control
504.2  DF  .~ Alarms or indicators
504.3  DF  .~ Fire extinguishers
504.3  DF  .~.~ Fusible control
505  DF  .~.~ Float-controlled
506  DF  .~.~ Pressure-controlled
507  DF  .~ Self-closing valve
508  DF  STEAM DOMES
509  DF  SUBMERGED STEAM CHAMBER
510  DF  SUPPORTS
511  DF  TUBES AND CONNECTIONS
512  DF  TUBE SHEETS
******************************
DIGESTS
******************************
DIG 1  DD  Air heater
DIG 2  DD  Air heater - indirectly heated
DIG 3  DD  Gas flow baffles
DIG 4  DD  Once through boilers
DIG 5  DD  Critical pressure
DIG 6  DD  Damper-directed radiation
DIG 7  DD  Feeding air
DIG 10  DD  Portable units
DIG 11  DD  Removable steam-heating elements
DIG 13  DD  Tubes - composition and protection
DIG 14  DD  Tube replacement
DIG 15  DD  Valves
DIG 16  DD  Welding