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Steam boiler operation - the inside story Part 7 - very high demand

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Kind: captions
Language: en

00:00:04.940
if the steam demand is increased beyond
00:00:07.389 00:00:07.399 the limit of the boilers maximum steam
00:00:09.129 00:00:09.139 generation rate even for a very short
00:00:11.170 00:00:11.180 time problems can occur with both
00:00:13.089 00:00:13.099 carryover and low boiler water level in
00:00:15.490 00:00:15.500 fact it's not uncommon for a boiler to
00:00:17.800 00:00:17.810 shut down when overloaded due to the low
00:00:20.320 00:00:20.330 level alarm operating to explain this
00:00:22.929 00:00:22.939 watch what happens when the steam demand
00:00:25.089 00:00:25.099 is gradually increased to just 15% above
00:00:28.000 00:00:28.010 the boilers maximum rated output as
00:00:30.120 00:00:30.130 expected the drop in pressure is causing
00:00:33.490 00:00:33.500 the bubble surface to rise and the
00:00:35.470 00:00:35.480 conditions are becoming more turbulent
00:00:37.119 00:00:37.129 due to the formation of flash steam
00:00:39.240 00:00:39.250 water is soon drawn into the steam take
00:00:42.010 00:00:42.020 off but this time without the demand
00:00:43.869 00:00:43.879 moderated the turbulent bubble level
00:00:45.970 00:00:45.980 continues to rise swapping the camera
00:00:48.279 00:00:48.289 pod leading to near continuous carryover
00:00:51.360 00:00:51.370 none of this is apparent in the gauge
00:00:53.590 00:00:53.600 glass or the protection tube because
00:00:55.600 00:00:55.610 they are measuring virtually bubble free
00:00:57.160 00:00:57.170 water and the water at the top of the
00:00:59.170 00:00:59.180 boiler consists mainly of steam bubbles
00:01:01.420 00:01:01.430 the measured levels begin to fall as
00:01:03.729 00:01:03.739 water continuously flashes into steam in
00:01:06.010 00:01:06.020 the boilers attempt to satisfy the
00:01:07.930 00:01:07.940 excessive demand eventually the first
00:01:10.660 00:01:10.670 low level alarm is triggered this shuts
00:01:13.270 00:01:13.280 down the burner and the bubble charge
00:01:15.130 00:01:15.140 water drops very rapidly it soon becomes
00:01:18.130 00:01:18.140 apparent how little water is left in the
00:01:19.990 00:01:20.000 boiler so little in fact that the stay
00:01:22.630 00:01:22.640 bars become exposed this demonstrates
00:01:26.650 00:01:26.660 just how important it is to keep a
00:01:28.660 00:01:28.670 boiler operating within its design
00:01:29.949 00:01:29.959 parameters and the need for reliable
00:01:32.320 00:01:32.330 accurate level probes

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