Thick Wall Expansion Joint - Shell Tube Info

Owned by Former user (Deleted)
Last updated: Oct 12, 2016 by Mike Clark
4 min read

Shell Information

Description: The label given for the component.

Thickness: This value is in the new condition. For the component to pass, this value must be at least the sum of the thickness necessary for pressure and temperature, corrosion allowances, and forming allowances or under-tolerances. If the thickness necessary for pressure and temperature is less than the thickness required by UG-16, the nominal thickness must be at least the sum of the UG-16 thickness and the tolerances, etc. In some cases, under-tolerance is not considered (e.g., for nozzle reinforcement, the under-tolerance of the nozzle neck is ignored). When “Solve for Thickness” is selected, the software will determine the smallest standard size that passes. The user is able to manually edit this value.

Corrosion Allowance: Corrosion allowance on the inside of the component (concave side).

Material: A brief description of the component material. When the material selection dialog is used, the default description is based on settings on the Materials-Misc. tab under Tools > Defaults. For example, if the settings are for Spec and Type/Grade and the material is SA-516 Grade 70, this field will show SA-516 Gr. 70. If the settings are instead just for Spec, the field will show SA-516. The field may be edited by the user to say anything without breaking the relationship to the material database; while this flexibility can be very helpful, the user must take care to enter correct information.

Condition: A brief description of the component material. Similar to the "Material" field, the description will default a certain way based on settings on the Materials-Misc. tab under Tools > Defaults when the material selection is used. This field may be edited by the user without breaking the relationship to the material database. As with the “Material” field, the user must take care to enter correct information.

(Tsm): The mean shell temperature along the shell length as expected during operation. It is generally not conservative to substitute the shell design temperature for Tsm.

Ambient Temp.: The ambient temperature.

Alpha s,m: The mean coefficient of thermal expansion of the shell material at the mean shell temperature along the shell length (Ts,m). The mean coefficient of thermal expansion based on the TE tables from Section II, Part D; column B is used in those tables. There are several materials that do not have clear matches in these tables. When a clear match cannot be found by the software’s assignment criteria, this value will be zero. Manually editing this field will sever the connection to the material in the database as indicated by the “Unlisted Material” caption.

Consider Effect of Different shell material/thickness adjacent to tubesheet: Select this box if the shell has a different thickness or material adjacent to the tubesheet; this is the same as using a shell band. Selecting this box will enable the Shell Band fields.

Shell Band Information

Material: A brief description of the component material. When the material selection dialog is used, the default description is based on settings on the Materials-Misc. tab under Tools > Defaults. For example, if the settings are for Spec and Type/Grade and the material is SA-516 Grade 70, this field will show SA-516 Gr. 70. If the settings are instead just for Spec, the field will show SA-516. The field may be edited by the user to say anything without breaking the relationship to the material database; while this flexibility can be very helpful, the user must take care to enter correct information.

Condition: A brief description of the component material. Similar to the "Material" field, the description will default a certain way based on settings on the Materials-Misc. tab under Tools > Defaults when the material selection is used. This field may be edited by the user without breaking the relationship to the material database. As with the “Material” field, the user must take care to enter correct information.

Alpha s,m,1: The mean coefficient of thermal expansion of the shell material at the mean shell temperature along the shell length (Ts,m). The mean coefficient of thermal expansion based on the TE tables from Section II, Part D; column B is used in those tables. There are several materials that do not have clear matches in these tables. When a clear match cannot be found by the software’s assignment criteria, this value will be zero. Manually editing this field will sever the connection to the material in the database as indicated by the “Unlisted Material” caption.

L1, L1': Length of shell thickness adjacent to the tubesheets.

Tube Information

Material: A brief description of the component material. When the material selection dialog is used, the default description is based on settings on the Materials-Misc. tab under Tools > Defaults. For example, if the settings are for Spec and Type/Grade and the material is SA-516 Grade 70, this field will show SA-516 Gr. 70. If the settings are instead just for Spec, the field will show SA-516. The field may be edited by the user to say anything without breaking the relationship to the material database; while this flexibility can be very helpful, the user must take care to enter correct information.

Condition: A brief description of the component material. Similar to the "Material" field, the description will default a certain way based on settings on the Materials-Misc. tab under Tools > Defaults when the material selection is used. This field may be edited by the user without breaking the relationship to the material database. As with the “Material” field, the user must take care to enter correct information.

Length: The total length of tubes. The user may substitute the length of tubes between tubesheets which is consistent with part UHX. Using the total length of tubes will result in higher differential movement.

Ttm: The mean tube temperature along the tube length as expected during operation; this considers the entire tube bundle. It is generally not conservative to substitute the tube design temperature for Ttm.

Alpha t,m: The mean coefficient of thermal expansion of the tube material at the mean temperature along the tube length (Tt,m). The mean coefficient of thermal expansion based on the TE tables from Section II, Part D; column B is used in those tables. There are several materials that do not have clear matches in these tables. When a clear match cannot be found by the software’s assignment criteria, this value will be zero. Manually editing this field will sever the connection to the material in the database as indicated by the “Unlisted Material” caption.