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Online Course - TEMA Shell & Tube Heat Exchangers 2.1
WEBVTT Kind: captions Language: en
00:00:00.500 welcome back to the shell and tube heat 00:00:02.78000:00:02.790 exchangers part 2 you online course you 00:00:06.41000:00:06.420 are watching the introductory video of 00:00:08.27000:00:08.280 module 1 getting started this video is a 00:00:12.49900:00:12.509 quick overview of the different contents 00:00:14.41900:00:14.429 you have to get acquainted with prior 00:00:16.40000:00:16.410 any development the contents that will 00:00:20.81000:00:20.820 be covered in this module have been 00:00:22.58000:00:22.590 outlined to acquire a solid background 00:00:25.04000:00:25.050 of general vocabulary and terminology 00:00:29.91900:00:29.929 contents in this module are arrangement 00:00:33.97900:00:33.989 of shell and tube heat exchangers design 00:00:36.86000:00:36.870 codes as me8 division 1 code design 00:00:42.17000:00:42.180 conditions material selection mechanical 00:00:46.49000:00:46.500 properties of steel and a low oil stress 00:00:52.38900:00:52.399 in a shell and tube heat exchanger 2 00:00:55.40000:00:55.410 fluids circulating at different 00:00:57.04900:00:57.059 temperature conditions exchange heat 00:00:59.38900:00:59.399 through the walls of the tubes without 00:01:01.52000:01:01.530 direct contact between the fluids the 00:01:07.60900:01:07.619 fluid flowing inside the heat transfer 00:01:10.16000:01:10.170 tubes that belongs to the tube bundle 00:01:12.53000:01:12.540 defines the tube side of a shell and 00:01:14.99000:01:15.000 tube heat exchanger on the contrary the 00:01:19.46000:01:19.470 fluid flowing inside the shell of the 00:01:21.17000:01:21.180 exchanger defines the shell side of a 00:01:23.87000:01:23.880 shell and tube heat exchanger depending 00:01:28.01000:01:28.020 on the many different configurations 00:01:29.96000:01:29.970 available shell and tube heat exchangers 00:01:32.45000:01:32.460 are formed by different elements the 00:01:35.74900:01:35.759 picture shows the main parts of a 00:01:37.96900:01:37.979 floating to sheet type shell and tube 00:01:40.31000:01:40.320 heat exchanger widely used in 00:01:42.64900:01:42.659 petrochemical refineries 00:01:45.95000:01:45.960 the main reason that led to the 00:01:47.72000:01:47.730 development of these design codes was 00:01:50.06000:01:50.070 essentially to relate shell and tube 00:01:51.74000:01:51.750 heat exchangers manufacturers in order 00:01:53.96000:01:53.970 to unify the design criteria and produce 00:01:56.72000:01:56.730 better final quality equipment in other 00:01:59.24000:01:59.250 words safer exchangers it can be said 00:02:04.76000:02:04.770 that there are two groups of design 00:02:06.23000:02:06.240 codes mechanical design codes and 00:02:09.28000:02:09.290 pressure design codes since a heat 00:02:13.28000:02:13.290 exchanger is also a pressure vessel each 00:02:16.58000:02:16.590 mechanical design codes relates with a 00:02:18.83000:02:18.840 pressure vessel code the pressure 00:02:21.41000:02:21.420 vessels codes to be used is defining the 00:02:24.17000:02:24.180 scope of each mechanical design code the 00:02:28.52000:02:28.530 most widely used codes for the 00:02:30.32000:02:30.330 mechanical design are the tama code 00:02:32.77000:02:32.780 largely used in metro Chemical 00:02:35.06000:02:35.070 refineries and applications in general 00:02:36.92000:02:36.930 and the hei standard mainly used for 00:02:42.56000:02:42.570 power plants both codes prescribe the 00:02:46.25000:02:46.260 use of the asthma section eight code for 00:02:48.94900:02:48.959 the design pressure in this course we 00:02:54.86000:02:54.870 will focus on asthma code section eight 00:02:57.38000:02:57.390 division one the organization of the 00:03:00.47000:03:00.480 code follow this structure shown in the 00:03:03.14000:03:03.150 next slide it has three main subsections 00:03:07.44900:03:07.459 subsection a general requirements where 00:03:12.97900:03:12.989 the most used parts within this section 00:03:15.02000:03:15.030 is part ug general requirements for all 00:03:18.86000:03:18.870 construction methods and all materials 00:03:21.97000:03:21.980 then we have subsection B fabrication 00:03:25.67000:03:25.680 requirements in this case the most used 00:03:29.18000:03:29.190 part within this section is part u-w 00:03:32.94900:03:32.959 requirement for pressure vessels 00:03:35.00000:03:35.010 manufactured by welding 00:03:37.99000:03:38.000 then there is subsection C material 00:03:41.51000:03:41.520 requirement were the most use part 00:03:44.69000:03:44.700 within this section is part UCS 00:03:48.10000:03:48.11000:03:50.03000:03:50.040 constructor out of carbon steel and low 00:03:52.82000:03:52.830 alloy steel and finally we have the 00:03:57.19900:03:57.209 offenses mandatory and non-mandatory the 00:04:02.66000:04:02.670 adequate definition of the design 00:04:04.72900:04:04.739 condition is a stepping stone of any 00:04:07.16000:04:07.170 satisfactory design in some cases the 00:04:10.33900:04:10.349 real difficulty of the calculation 00:04:11.96000:04:11.970 process lies with definition of the 00:04:14.15000:04:14.160 design conditions pressure and 00:04:17.53900:04:17.549 temperature are just two of the many 00:04:19.96900:04:19.979 design constraints that should be taken 00:04:22.15900:04:22.169 into account some of them are 00:04:25.24000:04:25.250 temperature as in ambient temperature 00:04:28.37000:04:28.380 MDM t design temperature pressure 00:04:32.37900:04:32.389 operating design mouth test pressure 00:04:35.89000:04:35.900 loading dead loads live loads cyclic 00:04:39.59000:04:39.600 loading corrosion allowance or liquid 00:04:42.77000:04:42.780 level wind and seismic conditions esteem 00:04:48.59000:04:48.600 out hydrostatic task requirements 00:04:52.65900:04:52.669 transportation and lifting conditions 00:04:55.81000:04:55.820 material selection and pressure vessel 00:04:58.40000:04:58.410 design depend on these design conditions 00:05:01.96000:05:01.970 the Asthma code does not recommend or 00:05:04.87900:05:04.889 suggest any material for any particular 00:05:07.19000:05:07.200 application the code merely states what 00:05:11.09000:05:11.100 materials are allowed and the 00:05:12.59000:05:12.600 requirements they have to comply with in 00:05:16.76000:05:16.770 order to select an adequate material for 00:05:19.40000:05:19.410 a concrete application the following 00:05:21.71000:05:21.720 properties shall be evaluated allowable 00:05:25.21900:05:25.229 stress corrosion resistance temperature 00:05:29.87000:05:29.880 resistance and toughness or resilience 00:05:34.85000:05:34.860 first of all the main mechanical 00:05:37.30900:05:37.319 properties of steel must be known the 00:05:41.30000:05:41.310 basic mechanical properties of steel can 00:05:43.85000:05:43.860 be obtained through a typical stress 00:05:45.64900:05:45.659 strain test the diagram shows point a is 00:05:50.02900:05:50.039 known as yield point if the tension load 00:05:53.36000:05:53.370 is released at any point below point a 00:05:55.74900:05:55.759 the material returns to its initial 00:05:58.21900:05:58.229 state without any permanent deformation 00:06:01.36000:06:01.370 when this point is exceeded the material 00:06:04.67000:06:04.680 is no longer elastic releasing the load 00:06:07.55000:06:07.560 on this range lifts the specimen with 00:06:10.49000:06:10.500 the permanent or plastic deformation 00:06:13.74900:06:13.759 point B is known as tensile stress and 00:06:17.17900:06:17.189 Point C is known as rupture point 00:06:22.80900:06:22.819 interestingly enough none of the 00:06:25.55000:06:25.560 aforementioned points is used for the 00:06:27.43900:06:27.449 design of pressure vessels so what is 00:06:30.74000:06:30.750 the allowable stress to be considered in 00:06:32.74900:06:32.759 our designs pressure vessels among other 00:06:36.61900:06:36.629 mechanical equipment must not work 00:06:38.77900:06:38.789 within the plastic deformation zone 00:06:40.45900:06:40.469 under any circumstances after point a 00:06:44.42000:06:44.430 the material has lost its initial 00:06:46.93900:06:46.949 mechanical properties permanently 00:06:49.18000:06:49.190 therefore the allowable stress is always 00:06:52.04000:06:52.050 a percentage below the yield point this 00:06:56.14900:06:56.159 percentage is a safety factor and it 00:06:58.70000:06:58.710 defines the allowable stress the 00:07:01.73000:07:01.740 allowable stress is established by the 00:07:03.80000:07:03.810 design code for each case and it is 00:07:06.95000:07:06.960 selected for a given material and the 00:07:09.01900:07:09.029 design temperature unloyal stresses for 00:07:13.39900:07:13.409 all accepted materials to be used in the 00:07:15.95000:07:15.960 design of pressure vessels according to 00:07:17.86900:07:17.879 section a division-one are found in 00:07:21.01900:07:21.029 table 1 a of section 2 Part D of the 00:07:25.36900:07:25.379 boiler and pressure vessel code this 00:07:29.02900:07:29.039 video is just a quick overview of the 00:07:31.27900:07:31.289 different contents you have to get 00:07:32.62900:07:32.639 acquainted with you should check and 00:07:35.32900:07:35.339 understand the different contents 00:07:36.74000:07:36.750 mentioned in this video in the study 00:07:38.77900:07:38.789 notes prior any development remember 00:07:42.14000:07:42.150 that all concepts dealt with are 00:07:44.32900:07:44.339 complimentary and that assignments are 00:07:46.57900:07:46.589 linked 00:07:47.91000:07:47.920 keep up with the woodwork and come back 00:07:49.92000:07:49.930 for more thank you I have a great day
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