112:
1113:
24:
781:
501:
1102:
923:
670:
104:
190:
The blower provides a forced draught on the fire, encouraging combustion. It consists of a hollow ring mounted either in the base of the chimney or on top of the blastpipe. Holes are drilled in the top of the blower ring, and when steam is fed into the ring, the steam jets out of the holes and up the
1246:
A non-return valve allowing atmospheric air into the boiler, if a cold boiler reduces its internal pressure on cooling down. This avoids the risk of damage to some types, if their pressure loads are reversed. Few boilers are fitted with these, although the feedwater clack valve usually has a similar
807:, the top drum or chamber, large enough for a worker to enter and used for maintenance and cleaning. Manholes are sealed with a removable door from the inside. As they are oval, this door may be turned and lifted out through the hole. Doors are clamped in place from the outside with one or two
257:. Additional annual safety inspections must also be undertaken, which may result in the locomotive being withdrawn from service if the boiler requires work. When the ticket "expires" the locomotive cannot be used until the boiler has been overhauled or replaced, and a new ticket obtained.
401:
The upper sheet of the inner firebox on a locomotive boiler. It is the hottest part of the firebox, and sometimes at risk of boiler explosion, should the water level drop and the crown sheet be exposed and thus allowed to overheat. Supported from above by complex
1314:
a boiler whose primary heating surface is composed of many small tubes, filled with water. Tubes of 3 inch diameter and above are termed "large-tube" boilers. Later water-tube designs used smaller "small-tubes" of 2 inches or
713:
erosion of a boiler's plates from the internal water space, particularly where there is a step inside the shell. This was a problem for early boilers made from lapped plates rather than butted plates, and gave rise to many
325:
The damaging condition where water droplets are carried out of the boiler along with the dry steam. These can cause scouring in turbines or hydraulic lock in cylinders. The risk is accentuated by dirty feedwater. See also
360:
The layer of insulation and outer wrapping around a boiler shell, particularly that of a steam locomotive. In early practice this was usually wooden strips held by brass bands. Later and modern practice is to use
238:
Heavy-duty one-piece protective clothing, worn when removing limescale from the inside of boilers and inspecting the inside of a firebox for steam leaks, for which task it is necessary to crawl through the
476:
Either a fire-tube or water-tube that is entirely below the water-level of the operating boiler. As corrosion and scaling is most active in the region of the water-level, this reduces wear and maintenance
771:
where the water level is visible through a flat glass window in a strong metal frame, rather than a cylindrical tube. These were popular with some operators, and increasingly so for high pressure boilers.
87:
or hot water have been designed in countless shapes, sizes and configurations. An extensive terminology has evolved to describe their common features. This glossary provides definitions for these terms.
291:. This forces combustion gases from the front of the furnace to flow further, back over the rest of the furnace, encouraging efficient combustion. The invention of the brick arch, along with the
825:
particles, precipitates and general impurities that builds up in the lower parts of a boiler. Mud reduces water circulation and so a local buildup may lead to localized overheating and possibly
219:(common misconception). A boilermaker is a skilled metalworker, usually the member of a union of the same name, skilled in platework or welding. A boilermaker may or may not be a boilersmith.
703:
part of the water level gauge, which normally consists of a vertical glass tube connected top and bottom to the boiler backplate. The water level must be visible within the glass at all times.
578:
Emptying out the remains of the fire after a day's work. A time-consuming and filthy task; labour-saving ways to improve this became important in the final days of steam locomotives.
1190:
placed on the top of the boiler drum. This encourages rapid mixing of the cold feedwater with the hot steam, reducing the risk of thermal shock to the heated parts of the boiler.
166:
build-up, so by venting it whilst still dissolved, the build-up is reduced. When early marine boilers were fed with salt water, they would be blown-down several times an hour.
1273:
a furnace or other wall within a boiler enclosure that is composed of numerous closely set water-tubes. These tubes may be either bare, or covered by a mineral cement.
1018:
a cylindrical vessel mounted at a high point of a water-tube boiler, where dry steam may separate above the water level, so that it may be drawn off without risk of
154:
Part of the exhaust system that discharges exhaust steam from the cylinders into the smokebox beneath the chimney in order to increase the draught through the fire.
811:
spanning the hole and tightened down with a nut on a stud. As the cutting of a manhole weakens the boiler shell, the surrounding area is strengthened with a patch.
540:
Replaceable cast-iron bars that form the base of the furnace and support the fire. These wear out frequently, so as designed for easy replacement. See also:
346:
from the noise it makes. A non-return valve where the feedwater enters the boiler drum. They are usually mounted halfway along the boiler drum, or else as a
466:
Large external pipes in many water-tube boilers, carrying unheated cold water from the steam drum down to the water drum as part of the circulation path.
1038:
that contains a turbulent mixture of steam and water, with a substantial part of this being water. The terms are used somewhat interchangeably.
111:
996:
an enclosed space at the extremity of a fire-tube boiler, where the exhaust gases from the tubes are combined and pass to the flue or chimney.
880:
Where a sudden reduction of steam pressure caused by a large, suddenly applied load may result in boiler water being pulled into the pipework.
1463:
1413:
1370:
1332:
370:
369:
was used for cladding. The outer shape of the cladding is often a simplification of the underlying boiler shell. Also termed "clothing" in
45:
1092:
If superheated steam is required it passes through a superheater, a heat exchanger where additional heat is added to the saturated steam.
1058:. Unlike the superheater, the steam drier does not attempt to raise the temperature of the steam significantly beyond the boiling point.
1514:
67:
452:
A raised location on the top of the main boiler drum, providing a high point from which to collect dry steam, reducing the risk of
1489:
1054:, thus ensuring that all water in the steam has been evaporated, thus avoiding problems with water droplets in the cylinders or
138:. This may be made of brickwork for a stationary boiler, or steel sheet for a locomotive. Ashpans are often the location of the
1084:
than atmospheric pressure. This avoids any risk of vacuum collapse, when a hot boiler is allowed to cool down out of service.
1112:
253:
on passing a formal inspection after a major rebuild, and generally covering a period of ten years (eight years on the
215:
A craftsman skilled in the techniques required for the construction and repair of boilers - not to be confused with at
1494:
1337:
221:
A boilersmith may also be a member of another trade, such as a plumber or pipeworker, and so may not be a boilermaker.
38:
32:
669:
875:
660:
becomes dangerously low. It melts when overheated, releasing a jet of steam into the firebox and alerting the crew.
1291:
the boiler. Plugs, as compared to mudholes, are usually screwed into a taper thread, rather than held by clamps.
762:
49:
1061:
883:
595:
A boiler where the primary heating surface is tubes with hot gas flowing inside and water outside. See also:
1362:
1029:
974:
of a boiler, used to blow down lighter oily or foamy deposits within a boiler that float on the water-level.
1499:
565:
549:
365:
insulation matting (or other less hazardous fibres) covered with rolled steel sheets. On some locomotives
274:
260:
516:
295:
and forced draught, was a major factor in allowing early locomotives to begin to burn coal, rather than
91:
Terms which relate solely to boilers used for space heating or generating hot water are identified by (
1504:
1405:
954:. Where this scale falls to the bottom of the boiler and mixes with other contaminants, it is termed
780:
162:
Periodic venting of water from the boiler. This water contains the most concentrated precursors for
1121:
1075:
527:
254:
230:
A structural element inside a boiler which supports surfaces under pressure by tying them together.
1318:
646:
961:
500:
1459:
1409:
1366:
1181:
1139:
1006:
804:
690:
521:
288:
1509:
826:
756:
715:
590:
511:
205:
A pressure vessel for the creation of hot water or steam, for residential or commercial use.
1250:
1068:
638:
181:
157:
1132:
1101:
999:
686:
350:, but away from the firebox, so as to avoid stressing it with the shock of cold water.
1483:
1055:
719:
680:
560:
A door leading from outside the boiler into the firebox, through which fuel (such as
922:
931:
651:
633:
619:
604:
491:
that economizes on steam consumption by using waste steam, such as engine exhaust.
843:, particularly one mounted low on the boiler whose function is primarily to trap
134:
A container beneath the furnace, catching ash and clinker that falls through the
1087:
1041:
366:
296:
233:
225:
216:
1455:
1149:
1013:
947:
803:
an oval access door into a part of the boiler, for example the shell or, in a
388:
270:
192:
149:
526:
A form of water-tube where the water tubes are single-ended, similar to a
991:
746:
362:
265:
Removal or chemical modification of boiler feedwater impurities to avoid
1126:
A form of water-tube where the tube is single-ended; predecessor to the
266:
718:. In later years it was a problem for the non-circular water drums of
936:
an automatic valve used to release excess pressure within the boiler.
643:
The base of the firebox, where the inner and outer shells are joined.
434:
The cleanup process at the end of the working day, usually involving
250:
80:
865:
the boiler, either as an inlet for a hose or as a drain for removed
103:
1111:
1100:
921:
779:
668:
499:
287:
A horizontal baffle of firebrick within the furnace, usually of a
110:
102:
84:
1080:
an automatic non-return valve, which opens when the boiler is at
142:. They may also be shaped into hoppers, for easy cleaning during
1469:
618:
A large fire tube, either used as the main heating surface in a
561:
92:
759:
to force feedwater into the boiler, even against its pressure.
17:
176:
A valve mounted low-down on the boiler, often around the
249:
The safety certificate issued for a steam (locomotive)
1226:) and one at the front of the boiler, adjacent to the
755:
without moving parts that uses steam pressure and the
736:, too small for access but useful for inspection and
626:
in a locomotive-style boiler where these contain the
554:
In a steam engine, the area where the fuel is burned.
387:
over a boiler. Named from the similar hoops under a
1436:. Admiralty. 1941. pp. 12–13 – via HMSO.
950:that precipitate out in the steam space around the
1153:
416:An adjustable flap controlling the air admitted
1402:Handbook for Railway Steam Locomotive Enginemen
530:with an internal tube to encourage circulation.
1208:, containing many small holes to receive the
1144:A generic term for water-tube boilers of the
8:
1216:has two tubeplates: one at the front of the
905:may be rocked or tipped to either break up
1357:Semmens, P.W.B.; Goldfinch, A.J. (2003) .
1116:Inside a water drum, showing the tube ends
191:chimney, stimulating draught, much like a
1105:Dismantled steam locomotive, showing the
689:water-tubes inserted in the furnace of a
68:Learn how and when to remove this message
31:This article includes a list of general
1349:
1166:a plate forming the lower front of the
1106:
1022:. This is similar to the function of a
383:The framework of hoops used to support
1213:
1171:
1152:practice, a reference to the specific
861:, too small for access but useful for
656:A safety device that indicates if the
597:
1333:List of boiler types, by manufacturer
1205:
1050:that adds additional heat to wet- or
7:
1186:in locomotive boilers, a feed water
1051:
177:
1451:
1433:
967:
752:
673:
1217:
1201:
1175:
1167:
1145:
910:
542:
435:
420:the fire-bed. Usually part of the
37:it lacks sufficient corresponding
14:
1448:Naval Marine Engineering Practice
1359:How Steam Locomotives Really Work
870:
808:
788:
120:
1187:
1047:
971:
951:
768:
657:
627:
22:
1408:. April 2006 . pp. 49–52.
1127:
1035:
840:
504:
1390:. McGraw-Hill. pp. 39–41.
1209:
623:
439:
292:
1:
1302:
1227:
488:
384:
347:
240:
143:
1450:. later replacement for the
1432:. later replacement for the
1288:
1284:
1019:
913:the fire after a day's work.
906:
898:
862:
858:
784:
741:
737:
733:
453:
327:
135:
116:
1338:Steam locomotive components
421:
163:
139:
1531:
902:
822:
107:Steam locomotive blastpipe
1386:Kemmer, Frank N. (1979).
1023:
403:
1515:Glossaries of technology
1430:BR 77 Machinery Handbook
1388:The NALCO Water Handbook
985:
955:
946:dissolved minerals from
901:, where sections of the
866:
844:
1490:Steam boiler components
1363:Oxford University Press
909:within the fire, or to
52:more precise citations.
1117:
1109:
1030:Steam & water drum
1026:in a fire-tube boiler.
927:
792:
676:
622:, or used as enlarged
507:
261:Boiler water treatment
123:
108:
1115:
1104:
925:
783:
740:the boiler. See also
672:
503:
114:
106:
1458:. 1971 . p. 4.
897:An advanced form of
791:on a vertical boiler
564:) could be added by
180:, which is used for
1200:a plate across the
763:Klinger gauge glass
1495:Water-tube boilers
1319:Wet bottom furnace
1233:smokebox tubeplate
1118:
1110:
1107:smokebox tubeplate
928:
793:
677:
528:thimble water tube
508:
124:
109:
1465:978-0-11-770223-3
1415:978-0-7110-0628-7
1372:978-0-19-860782-3
1309:Water-tube boiler
1223:firebox tubeplate
1214:locomotive boiler
1172:locomotive boiler
1154:Admiralty example
1140:Three-drum boiler
1007:Steam accumulator
984:another term for
847:from circulation.
805:water tube boiler
716:boiler explosions
691:Lancashire boiler
598:water-tube boiler
436:dropping the fire
289:locomotive boiler
78:
77:
70:
1522:
1474:
1473:
1444:
1438:
1437:
1426:
1420:
1419:
1398:
1392:
1391:
1383:
1377:
1376:
1354:
1311:
1310:
1298:
1297:
1280:
1279:
1270:
1269:
1261:
1260:
1243:
1242:
1235:
1234:
1225:
1224:
1206:fire-tube boiler
1197:
1196:
1163:
1162:
981:
980:
943:
942:
894:
893:
854:
853:
836:
835:
818:
817:
800:
799:
757:Bernoulli effect
729:
728:
710:
709:
700:
699:
615:
614:
591:Fire-tube boiler
585:
584:
575:
574:
537:
536:
484:
483:
482:Exhaust injector
473:
472:
463:
462:
449:
448:
431:
430:
413:
412:
398:
397:
380:
379:
357:
356:
337:
336:
322:
321:
306:
305:
284:
283:
222:
212:
211:
202:
201:
173:
172:
131:
130:
115:Section through
73:
66:
62:
59:
53:
48:this article by
39:inline citations
26:
25:
18:
1530:
1529:
1525:
1524:
1523:
1521:
1520:
1519:
1480:
1479:
1478:
1477:
1466:
1454:. Vol. 1.
1446:
1445:
1441:
1428:
1427:
1423:
1416:
1400:
1399:
1395:
1385:
1384:
1380:
1373:
1356:
1355:
1351:
1346:
1329:
1308:
1307:
1295:
1294:
1277:
1276:
1267:
1266:
1258:
1257:
1251:Vertical boiler
1240:
1239:
1232:
1231:
1222:
1221:
1194:
1193:
1160:
1159:
1099:
1069:Steam separator
1062:Steam generator
1052:saturated steam
1046:a form of mild
978:
977:
970:mounted at the
968:blow-down valve
940:
939:
920:
891:
890:
851:
850:
833:
832:
815:
814:
797:
796:
778:
726:
725:
707:
706:
697:
696:
667:
639:Foundation ring
612:
611:
582:
581:
572:
571:
534:
533:
498:
481:
480:
470:
469:
460:
459:
446:
445:
428:
427:
410:
409:
395:
394:
377:
376:
354:
353:
334:
333:
319:
318:
315:
303:
302:
281:
280:
220:
209:
208:
199:
198:
178:foundation ring
170:
169:
128:
127:
101:
83:for generating
74:
63:
57:
54:
44:Please help to
43:
27:
23:
12:
11:
5:
1528:
1526:
1518:
1517:
1512:
1507:
1502:
1497:
1492:
1482:
1481:
1476:
1475:
1464:
1452:Stokers Manual
1439:
1434:Stokers Manual
1421:
1414:
1393:
1378:
1371:
1365:. p. 79.
1348:
1347:
1345:
1342:
1341:
1340:
1335:
1328:
1325:
1324:
1323:
1321:
1316:
1312:
1305:
1299:
1292:
1281:
1274:
1271:
1264:
1262:
1255:
1253:
1248:
1244:
1237:
1198:
1191:
1184:
1179:
1164:
1157:
1142:
1137:
1135:
1133:Thermic siphon
1130:
1124:
1098:
1095:
1094:
1093:
1090:
1085:
1078:
1073:
1071:
1066:
1064:
1059:
1044:
1039:
1032:
1027:
1016:
1011:
1009:
1004:
1002:
1000:Snifting valve
997:
994:
989:
982:
975:
964:
959:
944:
937:
934:
919:
916:
915:
914:
895:
888:
886:
881:
878:
873:
855:
848:
837:
830:
819:
812:
801:
777:
774:
773:
772:
765:
760:
753:feedwater pump
749:
744:
730:
723:
720:Yarrow boilers
711:
704:
701:
694:
687:thermic syphon
683:
681:Galloway tubes
674:Galloway tubes
666:
663:
662:
661:
654:
649:
644:
641:
636:
631:
616:
609:
607:
602:
593:
588:
586:
579:
576:
569:
558:
555:
552:
547:
538:
531:
524:
519:
517:Feedwater pump
514:
497:
494:
493:
492:
485:
478:
474:
467:
464:
457:
450:
443:
432:
425:
414:
407:
399:
392:
381:
374:
358:
351:
341:
338:
331:
323:
314:
311:
310:
309:
307:
300:
285:
278:
263:
258:
247:
244:
236:
231:
228:
223:
213:
206:
203:
196:
188:
185:
174:
171:Blow-down cock
167:
160:
155:
152:
147:
132:
100:
97:
76:
75:
30:
28:
21:
13:
10:
9:
6:
4:
3:
2:
1527:
1516:
1513:
1511:
1508:
1506:
1503:
1501:
1500:Steam boilers
1498:
1496:
1493:
1491:
1488:
1487:
1485:
1471:
1467:
1461:
1457:
1453:
1449:
1443:
1440:
1435:
1431:
1425:
1422:
1417:
1411:
1407:
1403:
1397:
1394:
1389:
1382:
1379:
1374:
1368:
1364:
1360:
1353:
1350:
1343:
1339:
1336:
1334:
1331:
1330:
1326:
1322:
1320:
1317:
1313:
1306:
1304:
1300:
1293:
1290:
1286:
1282:
1275:
1272:
1265:
1263:
1256:
1254:
1252:
1249:
1245:
1238:
1229:
1219:
1218:inner firebox
1215:
1211:
1207:
1203:
1199:
1192:
1189:
1185:
1183:
1180:
1177:
1173:
1169:
1168:outer firebox
1165:
1158:
1155:
1151:
1147:
1143:
1141:
1138:
1136:
1134:
1131:
1129:
1125:
1123:
1120:
1119:
1114:
1108:
1103:
1096:
1091:
1089:
1086:
1083:
1079:
1077:
1076:Suction valve
1074:
1072:
1070:
1067:
1065:
1063:
1060:
1057:
1053:
1049:
1045:
1043:
1040:
1037:
1033:
1031:
1028:
1025:
1021:
1017:
1015:
1012:
1010:
1008:
1005:
1003:
1001:
998:
995:
993:
990:
987:
983:
976:
973:
969:
965:
963:
960:
957:
953:
949:
945:
938:
935:
933:
930:
929:
924:
917:
912:
908:
904:
900:
896:
892:Rocking grate
889:
887:
885:
882:
879:
877:
874:
872:
868:
864:
860:
856:
849:
846:
842:
838:
831:
828:
824:
820:
813:
810:
809:bridge clamps
806:
802:
795:
794:
790:
786:
782:
775:
770:
766:
764:
761:
758:
754:
750:
748:
745:
743:
739:
735:
731:
724:
721:
717:
712:
705:
702:
695:
692:
688:
684:
682:
679:
678:
675:
671:
664:
659:
655:
653:
650:
648:
645:
642:
640:
637:
635:
632:
629:
625:
621:
617:
610:
608:
606:
603:
600:
599:
594:
592:
589:
587:
580:
577:
573:Fire dropping
570:
567:
563:
559:
556:
553:
551:
548:
545:
544:
543:Rocking grate
539:
532:
529:
525:
523:
520:
518:
515:
513:
510:
509:
506:
502:
495:
490:
486:
479:
477:requirements.
475:
468:
465:
458:
455:
451:
444:
441:
437:
433:
426:
423:
419:
415:
408:
405:
400:
393:
390:
386:
382:
375:
372:
368:
364:
359:
352:
349:
345:
342:
339:
332:
329:
324:
317:
316:
312:
308:
301:
298:
294:
290:
286:
279:
276:
272:
268:
264:
262:
259:
256:
252:
248:
246:Boiler ticket
245:
242:
237:
235:
232:
229:
227:
224:
218:
214:
207:
204:
197:
194:
189:
186:
183:
179:
175:
168:
165:
161:
159:
156:
153:
151:
148:
145:
141:
137:
133:
126:
125:
122:
118:
113:
105:
98:
96:
94:
89:
86:
82:
72:
69:
61:
58:February 2012
51:
47:
41:
40:
34:
29:
20:
19:
16:
1468:– via
1447:
1442:
1429:
1424:
1401:
1396:
1387:
1381:
1358:
1352:
1278:Washout plug
1241:Vacuum valve
1174:, below the
1148:pattern. In
1122:Thimble tube
1081:
932:Safety valve
871:washout plug
823:boiler scale
821:a sludge of
789:bridge clamp
652:Fusible plug
634:Flued boiler
620:flued boiler
596:
541:
487:A feedwater
471:Drowned tube
440:blowing down
417:
343:
304:Bridge clamp
121:bridge clamp
90:
79:
64:
55:
36:
15:
1505:Steam power
1404:. Hersham:
1289:washing out
1259:Water-level
1188:check valve
1161:Throatplate
1088:Superheater
1048:superheater
1042:Steam drier
972:water-level
952:water-level
869:. See also
863:washing out
769:gauge glass
738:washing out
698:Gauge glass
658:water level
628:superheater
605:Flash steam
442:the boiler.
396:Crown sheet
367:Russia iron
340:Clack valve
335:Check valve
234:Boiler suit
226:Boiler stay
217:boilermaker
210:Boilersmith
50:introducing
1484:Categories
1456:Royal Navy
1418:. 0604/A1.
1361:. Oxford:
1344:References
1296:Water drum
1268:Water-wall
1210:fire-tubes
1150:Royal Navy
1128:field tube
1036:steam drum
1014:Steam drum
962:Scum valve
948:hard water
841:water drum
767:A form of
522:Field-tube
505:Field-tube
378:Crinolines
282:Brick arch
33:references
1406:Ian Allan
1287:used for
1195:Tubeplate
884:Regulator
827:explosion
630:elements.
624:firetubes
583:Fire-tube
512:Feedwater
461:Downcomer
389:crinoline
373:practice.
320:Carryover
293:blastpipe
271:corrosion
193:blastpipe
182:blow down
158:Blow-down
150:Blastpipe
1327:See also
1303:mud drum
1283:A small
1228:smokebox
1182:Top-feed
1156:of this.
992:Smokebox
926:Smokebox
857:A small
834:Mud drum
747:Injector
732:A small
727:Handhole
708:Grooving
685:tapered
557:Firedoor
489:injector
429:Disposal
385:cladding
363:asbestos
355:Cladding
348:top feed
255:mainline
241:firehole
144:disposal
136:firebars
1510:Boilers
1285:mudhole
1247:effect.
1056:turbine
1020:priming
907:clinker
899:firebar
876:Priming
859:manhole
852:Mudhole
798:Manhole
785:Mudhole
742:mudhole
734:manhole
647:Furnace
566:stokers
550:Firebox
535:Firebar
454:priming
418:beneath
328:priming
275:foaming
117:manhole
81:Boilers
46:improve
1462:
1412:
1369:
1202:barrel
1176:barrel
1146:Yarrow
979:Sludge
422:ashpan
411:Damper
391:skirt.
251:boiler
200:Boiler
187:Blower
164:sludge
140:damper
129:Ashpan
35:, but
1315:less.
1204:of a
1170:of a
941:Scale
903:grate
404:stays
344:Clack
273:, or
267:scale
243:door.
85:steam
1470:HMSO
1460:ISBN
1410:ISBN
1367:ISBN
1301:see
1212:. A
1082:less
1024:dome
911:drop
787:and
613:Flue
562:coal
447:Dome
438:and
297:coke
119:and
93:HVAC
1097:T-W
986:mud
956:mud
867:mud
845:mud
816:Mud
776:M-R
665:G-K
371:LMS
313:C-E
99:A-B
95:).
1486::
1236:).
1034:a
966:A
839:a
751:a
269:,
1472:.
1375:.
1230:(
1220:(
1178:.
988:.
958:.
918:S
829:.
722:.
693:.
601:.
568:.
546:.
496:F
456:.
424:.
406:.
330:.
299:.
277:.
195:.
184:.
146:.
71:)
65:(
60:)
56:(
42:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
