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Campbell-Sevey - Shell and Tube Heat Exchanger

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Kind: captions
Language: en

00:00:06.530
my name is John arvig with Campbell
00:00:09.040 00:00:09.050 Seavey and today we are going to talk
00:00:10.840 00:00:10.850 about shell and tube heat exchangers for
00:00:13.869 00:00:13.879 steam and water to water applications
00:00:17.910 00:00:17.920 and water to process water actually and
00:00:21.089 00:00:21.099 typically where you will see these in
00:00:23.320 00:00:23.330 most applications is in building heat
00:00:26.910 00:00:26.920 domestic water heat and then heating up
00:00:29.920 00:00:29.930 some kind of a process so we'll just
00:00:34.060 00:00:34.070 start out we'll go through each port and
00:00:36.210 00:00:36.220 what they're used for and then we'll go
00:00:39.580 00:00:39.590 through the tubes in the tube sheet so
00:00:41.889 00:00:41.899 the this typically is the steam port on
00:00:45.369 00:00:45.379 the shell side steam comes in here you
00:00:48.369 00:00:48.379 can see in this small cutaway unit we
00:00:51.430 00:00:51.440 only have one baffle and then as we get
00:00:54.549 00:00:54.559 larger in size will have multiple
00:00:56.920 00:00:56.930 baffles and that steam will go in travel
00:01:00.160 00:01:00.170 across the tubes the baffles will
00:01:02.950 00:01:02.960 redirect it and then we'll go to this
00:01:05.590 00:01:05.600 bottom coupling which is the condensate
00:01:09.639 00:01:09.649 leaving so what we end up doing is
00:01:11.920 00:01:11.930 pushing all the steam across the tubes
00:01:13.840 00:01:13.850 and then out here and you see this
00:01:16.899 00:01:16.909 coupling at the top this is where we end
00:01:20.109 00:01:20.119 up putting our air vent and our vacuum
00:01:22.870 00:01:22.880 breaker assembly so if you imagine off
00:01:26.830 00:01:26.840 the top of here we would typically have
00:01:28.870 00:01:28.880 a control valve of some sort and as this
00:01:31.749 00:01:31.759 modulates there's times where this would
00:01:34.690 00:01:34.700 pull a vacuum so we have our vacuum
00:01:36.760 00:01:36.770 breaker here then as soon as that vacuum
00:01:39.819 00:01:39.829 breaker opens in our valve may shut we
00:01:43.120 00:01:43.130 now have just introduced oxygen in
00:01:46.319 00:01:46.329 non-condensibles into the shell of the
00:01:48.609 00:01:48.619 unit so now when we do that we have a
00:01:52.120 00:01:52.130 unit full of air and non-condensibles so
00:01:55.630 00:01:55.640 now when our steam control valve opens
00:01:58.450 00:01:58.460 back up we want to make sure we purge
00:02:00.730 00:02:00.740 all that out with the air vent so again
00:02:03.760 00:02:03.770 we put an air vent and a vacuum breaker
00:02:06.010 00:02:06.020 off of this this fitting and typically
00:02:09.669 00:02:09.679 this air vent we like to run to a drain
00:02:12.460 00:02:12.470 or to a condensate line to keep that
00:02:15.900 00:02:15.910 from dripping constantly
00:02:18.880 00:02:18.890 so that's the steam the air vent vacuum
00:02:22.580 00:02:22.590 breaker and the condensate side and then
00:02:26.330 00:02:26.340 on this side is typically our water
00:02:29.260 00:02:29.270 process water or building water and here
00:02:32.930 00:02:32.940 you can see our water would come in on
00:02:36.230 00:02:36.240 this cutaway on the bottom and it would
00:02:39.050 00:02:39.060 leave out the top so this would be what
00:02:41.420 00:02:41.430 we would call counter flow and you'd see
00:02:43.370 00:02:43.380 the water come in on the bottom of the
00:02:44.870 00:02:44.880 tubes come up and go out the top of the
00:02:47.840 00:02:47.850 tubes and out to our process and then
00:02:51.020 00:02:51.030 you can also see here the gaskets and
00:02:53.900 00:02:53.910 the tube sheet and then in this
00:02:57.560 00:02:57.570 particular case this is a single tube
00:03:00.170 00:03:00.180 sheet now in many states we have what we
00:03:04.250 00:03:04.260 call double wall tubes where there's
00:03:07.310 00:03:07.320 actually these tubes are a tube in a
00:03:10.040 00:03:10.050 tube and when that's the case we
00:03:12.920 00:03:12.930 actually have to tube sheets stack
00:03:15.470 00:03:15.480 together and now in when we have those
00:03:18.770 00:03:18.780 two tube sheets we actually have a
00:03:20.390 00:03:20.400 little keyhole that is our we point so
00:03:24.140 00:03:24.150 if something's ever were to happen to
00:03:25.850 00:03:25.860 these tubes we now can be notified that
00:03:27.949 00:03:27.959 they're weeping right here or leaking so
00:03:31.970 00:03:31.980 now that's steamed to water on this side
00:03:35.300 00:03:35.310 and condensate leaving we can also run
00:03:38.510 00:03:38.520 water to water so we can keep water on
00:03:41.240 00:03:41.250 this side and then we can also take
00:03:43.820 00:03:43.830 water on this side so there are a few
00:03:46.220 00:03:46.230 different ways we can run this and
00:03:47.870 00:03:47.880 that's the standard shell and tube heat
00:03:50.390 00:03:50.400 exchanger design

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