What’s going on with the suggestions regarding the sw6 design tube sheet?
Thread Content
Triangular tube layout: Number of tubes, n = 418. Material of the tube sheet: 20MnMo. Elastic modulus, Ep = 178000 MPa. Center distance between heat exchange tubes, S = 25 mm. Area of the partition grooves in the tube sheet (including tie rods and dummy tubes), Ad = 70.7 mm*mm. Corrosion allowance for the tube sheet, c2p = 2 mm. Depth of the partition grooves on the shell side of the tube sheet, Hs = 43 mm. Depth of the partition grooves on the tube side of the tube sheet, Hh = 440 mm. Input thickness of the tube sheet, δp = 30 mm. Stiffness reduction factor, η = 0.4. Strength reduction factor, μ = 0.4. Material of the tubes: S30408. Outer diameter of the tubes, d = 19 mm. Wall thickness of the tubes, δt = 2 mm. Nominal length of the tubes, L = 3000 mm. Equivalent length for tube instability, lcr = 0 mm. Average temperature of the tubes, θt = 250 °C. Allowable stress at the design temperature, tt = 94 MPa. Yield stress at the design temperature, σst = 123 MPa. Elastic modulus at the design temperature, Ett = 172000 MPa. Elastic modulus at the average temperature, Et = 179000 MPa. Coefficient of thermal expansion at the average temperature, αt = 1.742e-05 per °C. Difference in thickness between the tube sheet and the tube sheet flange, dt = 0 mm. Minimum ratio of the thickness of the tube sheet to that of the tube box flange, xt = 0.6 mm. Outer diameter of the flange, Do = 745 mm. Some of the input parameters should not be less than or equal to zero; please check the input data
According to national standard 151, what does the buckling equivalent length refer to?
"Depth of the tube sheet shell-side partition groove Hs = 43 mm; depth of the tube sheet tube-side partition groove Hh = 440 mm; input thickness of the tube sheet δp = 30 mm. The depth of the partition groove exceeds the thickness of the tube sheet
The depth input for the partition groove is clearly incorrect. Are you sure you understand?
For the partition grooves in the tube side and shell side, or when the groove depth in the structure is not that great, you should check the detailed drawings of the tube sheet, or select the appropriate tube sheet structure according to page 221 of GB/T151； And no value has been entered for your equivalent length under compressive instability – what’s going on? GB./T151 specifies the corresponding algorithm; moreover, what’s with such a small area for your partition slots? How many tubes and how many shell passes does this have? Could you send the condition data table?
What does the depth of the partition groove refer to?
Let’s see what the problems are; could you leave your WeChat or QQ number? There have been a lot of problems lately