Heat exchanger tube sheet issues

Calculated in accordance with GB151-1999.

Enter design parameters and other details on SW6 for calculation.

The thickness of the tube sheet is generally the thickness of the heat exchange tubes plus a corrosion allowance

I’m sorry; I typed it wrong. The thickness of the heat exchanger tube sheet must not be less than the diameter of the heat exchange tubes. (The common diameters for heat exchange tubes are usually 19 mm, 25 mm, and 38 mm.) The diameter of the heat exchange tube plus the corrosion allowance is determined through calculation

The extended part also serves as a flange fixed tube plate design calculation condition diagram. Design pressure ps 0.88 MPa. Design temperature Ts 190. Average metal temperature ts 180. Assembly temperature to 15. Shell material name 16MnR (hot rolled). Allowable stress at design temperature t 170 Mpa. Elastic modulus at average metal temperature Es 1.976e+05 Mpa. Thermal expansion coefficient at average metal temperature as 1.21e-05. mm/mm Shell side cylinder inner diameter Di 400 mm Shell side cylinder nominal thickness ds 6 mm Shell side cylinder effective thickness dse 5 mm Elastic modulus at design temperature of cylinder shell flange Ef' 1.846e+05 MPa Shell side cylinder inner diameter cross-sectional area A=0.25 p Di2 1.257e+05 mm2 Shell side cylinder metal cross-sectional area As=pds ( Di+ds ) 6362 mm2 Pipe design pressure pt -0.1 MPa Box design temperature Tt 150 Round material name 16MnR (hot rolled) Elastic modulus at the design temperature of the cylinder Eh 2.06e+05 MPa Nominal thickness of the pipe box cylinder (the pipe box is a high-neck flange, take the average of the large and small ends of the flange neck) dh 6 mm Effective thickness of the pipe box cylinder dhe 5 mm Elastic modulus at the design temperature of the pipe box flange Et" 1.87e+05 MPa Material name 00Cr19Ni10 Average pipe replacement temperature tt 135 Allowable stress of pipe material at design temperature tt 111.6 MPa Yield stress of pipe material at design temperature sst 123.8 MPa Elastic modulus of pipe material at thermal design temperature Ett 1.846e+05 MPa Elastic modulus of pipe material at average metal temperature Et 1.882e+05 MPa Thermal expansion coefficient of pipe material at average metal temperature at 1.699e-05 mm/mm Pipe outer diameter d 25 mm Pipe wall thickness dt 2.5 mm Note: Number of tubes n 105 Center distance of heat exchange tube S 33 mm Replacement of another tube Metal cross-sectional area 176.7 mm2 Heat exchange tube length L 2548 mm Effective length of tube (spacing between two tube plates) L1 2494 mm Tube bundle module Kt = Et na/LDi 3500 MPa Tube gyration radius 8.004 mm Equivalent length of heat pipe instability under pressure lcr 1224 mm Coefficient Cr = 171.6 Ratio lcr /i 152.9 Pipe stable allowable compressive stress ( ) MPa Pipe stable allowable compressive stress ( ) 34.31 MPa Material name 00Cr19Ni10 Design temperature tp 190 Pipe allowable stress at design temperature 82.2 MPa Elastic modulus at design temperature Ep 1.846e+05 MPa Tubesheet corrosion allowance C2 2 mm Tubesheet input thickness dn 27 mm Tubesheet calculated thickness d 21.1 mm Partition plate groove area (including tie rod and false tube area area) Ad 0 mm2 Plate tubesheet strength weakening coefficient h 0.4 Tubesheet stiffness weakening coefficient m 0.4 Pipe strengthening coefficient K = 4.867 Tubesheet and pipe connection type Welded tubesheet and pipe expansion joint (welding) height l 3.5 mm Allowable pull-off stress for expansion joints MPa Allowable pull-off stress for welding 55.8 MPa Pipe material name 00Cr19Ni10 Pipe box flange thickness 30 mm Flange outer diameter 515 mm Basic box flange moment 3.282e+06 N×mm Flange force under pipe side pressure operating conditions 8.23e+04 N×mm Flange width 57.5 mm Legal ratio 0.0125 Ratio 0.075 Coefficient (according to dh/Di, df”/Di, see Figure 25) 0.00 Blue coefficient w” (according to dh/Di, df”/Di, see Figure 26) 0.0008272 Rotational stiffness 27.42 MPa Material name 00Cr19Ni10 Shell flange thickness 27 mm Flange outer diameter 515 mm Body flange width 57.5 mm Ratio 0.0125 Legal ratio value 0.0675 Coefficient, according to dh/Di, df”/Di, check Figure 25 0.00 Blue coefficient, according to dh/Di, df”/Di, check Figure 26 0.0007537 Rotational stiffness 21.92 MPa Ratio of flange outer diameter to inner diameter 1.288 Shell flange stress coefficient Y (press K, check Table 9-5) 7.826 Dimensionless parameter of rotational stiffness 0.004919 Overall axial stiffness of expansion joint 0 N/mm First bending moment coefficient of tube plate (click to see Figure 27) 0.3169 System coefficient 13.23 Coefficient (click to see Figure 29) 2.94 Ratio of stiffness of heat exchange tube bundle and shell without expansion joint 2.778 The ratio of the stiffness of the heat exchange tube bundle to the shell with expansion joint. The second bending moment coefficient of the tube sheet (press K, Q or check Figure 28 (a) or (b)) 2.604 coefficient (replace Q when with expansion joint) 0.005693 Calculation coefficient (press K, Q or Qex check Figure 30) 0.007995 Flange moment reduction coefficient 0.3809 Tube sheet edge moment change coefficient 0.8471 Calculated blue moment change coefficient 0.6773 Area after tube plate opening Al = A - 0.25 npd 2 7.412e+04 mm2 Plate parameter tube plate layout area (triangular pipe layout) (square pipe layout) 9.903e+04 mm2 Number of equivalent diameter of tube plate layout area 355.1 mm Coefficient 0.5898 System coefficient 0.2503 Numerical coefficient 4.243 Calculation coefficient (replaces Q when equipped with expansion joints) 6.227 Calculate the ratio of the equivalent diameter of the tube plate layout area to the inner diameter of the shell 0.8877 The dimensionless width of the non-pipe arrangement area around the tube plate k = K (1-rt) 0.5466 Only the dangerous combined working condition under the action of shell side pressure Ps (Pt = 0) does not include the temperature difference stress meter The difference g between the thermal expansion deformation of the heat exchange tube and the shell side cylinder = at(tt-to)-as(ts-to) 0.0 4.245e-05 Equivalent pressure combination 0.88 0.88 MPa Effective pressure combination 3.734 5.734 MPa Basic flange moment coefficient 0.02965 0.01931 Tube plate edge moment coefficient 0.03447 0.02413 Tube plate edge shear coefficient 0.4562 0.3193 Total bending moment coefficient of tube plate 1.033 0.8704 The coefficient is only used when 0.2548 0.2146 coefficient, when m0, check the solid line in Figure 31(a) according to K and m 0.4177 0.1183 Coefficient G1 &gt; 0 , = , < 0 , = 0.4177 0.2146 管板径向应力系数 带膨胀节,Q为Qex = 0.0266 0.01238 管板布管区周边 处径向应力系数 = 0.04055 0.03095 管板布管区周边 处剪切应力系数 = 0.06367 0.05769 壳体法兰力矩系数 0.007438 0.003499 计算值 许用值 计算值 许用值 管板径向应力 52.63 1.5 = 123.3 37.62 3 = 246.6 MPa 管板布管区周边处径向应力 42.21 1.5 = 123.3 43.76 3 = 246.6 MPa 管板布管区周边剪切应力 5.9 0.5 = 41.1 8.208 1.5 = 123.3 MPa 壳体法兰应力 22.1 1.5 = 123.3 15.96 3 = 246.6 MPa 换热管轴向应力 -0.8473 = 111.6 = 34.31 -4.707 3 = 334.8 = 34.31 MPa 壳程圆筒轴向应力 11.08 = 144.5 15.42 = 433.5 MPa 换热管与管板连接拉脱应力 q = 0.5447 = 55.8 3.026 3焊接 胀接 167.4 MPa 仅有管程压力Pt作用下的危险组合工况 (Ps = 0) 不计温差应力 计温差应力 换热管与壳程圆筒热膨胀变形差 = (t -t )- (t -t ) 0.0 4.245e-05 当量压力组合 0.125 0.125 MPa 有效压力组合 0.6227 2.623 MPa 操作情况下法兰力矩系数 0.004458 0.001058 管板边缘力矩系数 0.004458 0.001058 管板边缘剪力系数 0.05899 0.01401 管板总弯矩系数 0.4443 0.3484 系数 仅用于 > 0.1095 0.0859 coefficient at 0, when m0, press K and m to check the solid line in Figure 31(a) 0.1493 0.1747 coefficient &gt; 0, = , < 0 , = 0.1462 0.1747 管板径向应力系数 带膨胀节Q为Q = 0.006768 0.007745 管板布管区周边 处径向应力系数 = 0.01268 0.009522 管板布管区周边 处剪切应力系数 = 0.04631 0.04434 壳体法兰力矩系数 -0.003995 -0.00529 计算值 许用值 计算值 许用值 管板径向应力 2.233 1.5 123.3 10.76 3 246.6 MPa 管板布管区周边处径向应力 0.4006 1.5 123.3 -1.48 3 246.6 MPa 管板布管区周边剪切应力 0.7155 0.5 41.1 2.886 1.5 123.3 MPa 壳体法兰应力 -1.979 1.5 123.3 -11.04 3 246.6 MPa 换热管轴向应力 -0.7081 111.6 34.31 -4.816 3 334.8 34.31 MPa 壳程圆筒轴 向 应 力 -0.6315 144.5 3.444 433.5 MPa 换热管与管板连接拉脱应力 q = 0.4552 55.8 3.096 3焊接 胀接 167.4 MPa 当Ps和Pt异号时，考虑壳程 和管程压力 同时作用下的危险组合工况 不计温差应力 计温差应力 换热管与壳体热膨胀变形差 = (t -t )- (t -t ) 0.0 4.245e-05 当量压力组合 1.005 1.005 MPa 有效压力组合 4.357 6.356 MPa 基本法兰力矩系数 0.0006372 0.0004367 操作情况下法兰力矩系数 0.00546 0.005259 管板边缘力矩系数 = Max 0.0006372 0.0004367 管板边缘剪力系数 0.008432 0.005779 管板总弯矩系数 0.336 0.33 系数 仅用于 时 0.08283 0.08136 系数 ,当m0时,按 K 和 m 查图31(a)实线 0.1782 0.18 系数G1 > 0, =max(G1e,G1I), &lt; 0, = 0.1778 0.1791 The radial stress coefficient of the tube sheet with expansion joint Q is Q = 0.007838 0.007878 The radial stress coefficient at the periphery of the tube sheet and pipe layout area = 0.009131 0.008945 The shear stress coefficient at the periphery of the tube sheet and pipe layout area = 0.04409 0.04398 Shell flange moment coefficient -0.003613 -0.00369 Calculated value Allowable value Calculated value Allowable value Tube sheet radial stress 18.1 1.5 123.3 26.54 3 246.6 MPa Radial stress around the tube sheet layout area -3.11 1.5 123.3 -4.991 3 246.6 MPa Shear stress around the tube sheet layout area 4.767 0.5 41.1 6.937 1.5 123.3 MPa Shell flange stress -12.52 1.5 123.3 -18.66 3 246.6 MPa Heat exchange tube axial stress -4.861 111.6 34.31 -8.969 3 334.8 34.31 MPa Shell side cylinder axial stress 6.977 144.5 11.05 433.5 MPa Pull-off stress of connection between heat exchange tube and tube sheet q = 3.125 55.8 5.766 3 Welded expansion joint 167.4 MPa Calculation result Nominal thickness of tube sheet 27 mm Tube sheet verification passed

Thank you all for your advice; I understand now