Home tab: Details > Halfpipe Jacket
Adds half-pipe jackets to the shell on the selected cylinder element, according to ASME Code, Section VIII, Division 1, Appendix EE.
Half pipe jackets are commonly made by rolling and forming flat bar in a specific radius and helical curvature that matches that of the parent shell course. These jackets are used to heat or cool the contents inside of the vessel. For vessels that are under cyclic service, it is advised that the jacket be attached by both a fillet and full penetration groove weld.
PV Elite performs required thickness and maximum allowable working pressure (Mawp) calculations for cylindrical shells with half-pipe jackets attached. The analysis is based on the ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, Paragraph EE-1, Appendix EE. The analysis is only valid for the cylindrical geometries shown in Figure EE-4.
Additionally, only nominal pipe sizes from 2 to 4 can be used. Although there are no charts for sizes 2.5 and 3.5, the software accepts these sizes and performs iterations between the given charts. If the half-pipe is a nonstandard pipe size, or has a formed radius, the actual radius is used in the calculations.
The software takes full account of corrosion allowance. Actual thickness values and corrosion allowances are entered, and the software adjusts thicknesses and diameters when making calculations for the corroded condition.
Delete - Deletes all jacket data.
Quick Results - Click to see a quick report of half pipe jacket analysis results.
Common Detail Parameters (on page 65)
126 PV Elite User's Guide Length Along Shell of Jacket Section - Enter the distance that the jacket extends along the length of the shell section. This value cannot be greater than the specified length of the shell course.
Pitch Spacing - Enter the distance between centers of adjacent half-pipes.
Shell Corrosion Allowance in Jacket - Enter the internal corrosion allowance of the half-pipe jacket.
Start Angle - Enter the start angle.
Jacket Design Temperature - Enter the design temperature of the jacket.
Jacket Design Pressure - Enter the design pressure of the fluid inside the jacket.
Jacket Material - Enter the name of the material. The software contains a database with most of the materials in ASME Code, Section II, Part D, Table 1A, 1B, and 3. Matl... allows a material to be selected directly from the Material Database Dialog Box (on page 433). To modify the material properties of the selected element, click to open the Material Properties Dialog Box (on page 474). Doing so only changes the properties of this element for this analysis. It does not modify the database.
Pipe - Click to open the Seamless Pipe Selection dialog box and select values from the piping database for Jacket Corrosion Allowance and Minimum Jacket Thickness.
Jacket Corrosion Allowance - Displays the corrosion allowance for the pipe that you selected in Pipe. You can also manually enter a value.
Minimum Jacket Thickness - Displays the thickness for the pipe that you selected in Pipe. You can also manually enter a value.
Inside Radius of Formed Jacket - Enter a value for a jacket formed from bar or plate. This value is only used if Formed Radius Type is selected for Nominal Pipe Size.
Nominal Pipe Size - Select the nominal pipe size of the jacket. Select 2 inch, 3 inch, or 4 inch to use sizes recognized by Appendix EE. Select 2.5 inch or 3.5 inch to interpolate from
Appendix EE graphs. Select Formed Radius Type for a non-standard jacket, and also enter a value for Inside Radius of Formed Jacket.
Contents Specific Gravity - Enter the specific gravity of any fluid contained within the jacket.
Enter the density or specific gravity of the liquid. Typical specific gravities and densities are shown below. The densities should be converted if you use another units system.
Name Specific Gravity Density (lb/ft3)
Ethane 0.3564 22.23
Propane 0.5077 31.66
N-butane 0.5844 36.44
Iso-butane 0.5631 35.11
PV Elite User's Guide 127
N-Pentane 0.6310 39.35
Iso-Pentane 0.6247 38.96
N-hexane 0.6640 41.41
2-methypentane 0.6579 41.03
3-methylpentane 0.6689 41.71
2,2-dimethylbutane 0.6540 40.78
2,3-dimethylbutane 0.6664 41.56
N-heptane 0.6882 42.92
2-methylheptane 0.6830 42.59
3-methylheptane 0.6917 43.13
2,2-dimethylpentane 0.6782 42.29 2,4-dimethylpentane 0.6773 42.24 1,1-dimethylcyclopentane 0.7592 47.34
N-octane 0.7068 44.08
Cyclopentane 0.7504 46.79
Methylcyclopentane 0.7536 46.99
Cyclohexane 0.7834 48.85
Methylcyclohexane 0.7740 48.27
Benzene 0.8844 55.15
Toluene 0.8718 54.37
Alcohol 0.7900 49.26
Ammonia 0.8900 55.50
Benzine 0.6900 43.03
Gasoline 0.7000 43.65
Kerosene 0.8000 49.89
Mineral Oil 0.9200 57.37
Petroleum Oil 0.8200 51.14
Water 1.0 62.4
128 PV Elite User's Guide
Tubesheet
Home tab: Details > Tubesheet
Adds a heat exchange tubesheet to the element. To build and analyze shell and tube heat exchangers with PV Elite, you must understand the modeling techniques involved:
First, define and design the pressure envelope or exterior components of the exchanger first, including all covers, flanges and cylinders. Verify that the design pressures and temperatures are correctly specified.
Tubesheets are frequently paired to cylinders or flanges. Click on the front end flange element just to the left of the tubesheet for proper definition, then click Tubesheet Analysis to define the assembly. Enter data on each tab of the Heat Exchanger Tubesheet Input dialog box. The software dynamically adds or removes tabs depending on the type of exchanger selected. For example, an exchanger with a floating head requires more input and displays more tabs than a U-tube type exchanger.
Tubesheets that are either completely integral or integral on the channel side are attached to the channel cylinder. These tubesheets must have a value for Distance from "From"
Node to define the length of that cylinder because they start at the end of the channel cylinder.
Verify that the 3D graphic looks like the needed geometry. Use the transparency feature to see inside of the exchanger. The software does not draw all tubes to improve performance.
Examples are located in the PV Elite installation folder.
Delete - Deletes all tubesheet data.
HTRI In - Select to open an .dbo HTRI output file.