Home tab: Details > ASME Appendix 9 Jacket
Adds ASME Appendix 9. Type 1 cylindrical jackets to the shell on the selected cylinder element, according to ASME Code, Section VIII, Division 1, Appendix 9.
This command is only available when Cylinder is selected as the Element Type, and ASME Section VIII-Division 1 was selected as the design code for File > New (on page 62).
A Type 1 jacket is specified as either a jacket or a vapor belt. Vapor belts cover perforated areas of some vessels but are more typically found on shell and tube heat exchangers. Jackets can have separate design conditions from the parent cylindrical element. Vapor belts have the same design conditions as the parent cylindrical element. The software calculates the required thickness and MAWP for the jacket and closure bars. The MAWP of vapor belts can influence nozzle design as well as the overall MAWP of the vessel. The software calculates the stiffened length of the inner vessel to account for the closure bars.
Both jackets and vapor belts can have nozzles attached. If a nozzle has an internal projection that cuts into the parent shell, the nozzle reinforcement calculations are for the parent shell. If the nozzle does not have an internal projection, the calculation is for the jacket. According to Appendix 9, nozzle calculations are not required for both the jacket and inner vessel.
The internal pressure in a vapor belt adds to the vacuum (external) pressure in the inner shell.
This extra pressure is reflected in the external pressure report generated during analysis.
Appendix 9 jackets are joined by inter-connecting pipework, affecting static pressure head considerations.
Enter the specific gravity of the fluid in the jacket or vapor belt. The software uses this value to calculate the weight of the fluid in the annular area.
Delete - Deletes all jacket data.
From Node - Displays the From Node for the selected element. The From Node is the software-generated node number describing the starting location of the element. The value cannot be modified.
Jacket Length L - Enter the length of the jacket along the cylinder element.
Dist. from 'From' Node to Jacket Bottom - Enter the distance from the From node to the bottom of the jacket.
Jacket Description -Enter a description for the jacket.
Is this a Vapor / Distribution Belt (cut outs in shell)? - Select if the jacket is a vapor belt or distribution belt.
PV Elite User's Guide 173 Select Jacket Figure (Fig. 9-2) - Displays the Type 1 jacket configuration. Other jacket
configurations in ASME Section VIII, Division 1, Appendix 9, Fig 9-2 are not supported.
Jacket Longitudinal Efficiency - Enter the welded joint efficiency, as defined in ASME Section VIII, Division 1, Table UW-12. For the weld on a Type 1 jacket (welded from both sides or with a removable backing strip), use the following efficiencies:
Full radiography: 1.00
Spot x-ray: 0.85
No radiography: 0.70
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.
Design Temperature, Internal - Enter the design temperature for internal pressure. Available when Is this a Vapor / Distribution Belt (cut outs in shell)? is not selected.
Design Temperature, External - Enter the design temperature for external pressure. Available when Is this a Vapor / Distribution Belt (cut outs in shell)? is not selected.
Jacket Pressure, Internal - Enter the design pressure for internal pressure analysis. Available when Is this a Vapor / Distribution Belt (cut outs in shell)? is not selected.
Jacket Pressure, External - Enter the design pressure for external pressure analysis. Available when Is this a Vapor / Distribution Belt (cut outs in shell)? is not selected.
Jacket Thickness - Enter the jacket thickness.
Jacket Corrosion Allowance - Enter the thickness of the corrosion allowance for the jacket.
Jacket Length for External Pressure - Enter the length of the jacket to use for external pressure calculations.
Jacket Inside Diameter - Enter the inside diameter of the jacket.
Specific Gravity of Contents - Enter the specific gravity of any fluid contained within the jacket.
This value is usually 1.0.
174 PV Elite User's Guide Half Apex Angle - When Type (b-2), Type (c), or Type (k) is selected for Select Closure Type (fig. 9-5), enter the half apex angle θmax (or theta max). For example:
For more information, see ASME Section VIII, Division 1, paragraph UG-33, Figure UG-33.1 for half apex angles on typical geometries.
For most internal pressure calculations, the half apex angle should not be greater than 30º, though the software calculates results for up to 60º. For external pressure calculations, the angle must not be greater than 60º.
Select Closure Type (Fig. 9-5) - Select one of the following closure types, according to Fig. 9-5 of Appendix 9:
Type (a)9
Type (b-1)
PV Elite User's Guide 175 Type (b-2)
Type (b-3)
Type (c)
176 PV Elite User's Guide Type (d-1)
Type (d-2)
Type (e-1)
PV Elite User's Guide 177 Type (e-2)
Type (f-1)
Type (f-2)
178 PV Elite User's Guide Type (f-3)
Type (g-1)
Type (g-2)
Type (g-3)
PV Elite User's Guide 179 Type (g-4)
Type (g-5)
Type (g-6)
Type (h, i-1(a))
180 PV Elite User's Guide Type (h, i-1(b))
Type (h, i-2)
Type (k)
Closure 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.
Closure Thickness - Thickness of the plate used for the closure.
Total Corrosion Allowance - Enter the thickness of the corrosion allowance for the closure.
PV Elite User's Guide 181