Clamp - Bolting

Owned by Former user (Deleted)
Dec 11, 2015
3 min read

Clamp Lug

The values in this section are best defined in the figure provided.

Bolting Material

Number of Bolts: The actual number of bolts, not the number of bolt holes.

Nominal Diameter: The nominal diameter of the bolt. This field will be completed automatically if the Bolt Search is used to select the bolts.

Root Area: The bolt root area based on the smallest diameter on the bolt. This field will automatically be completed if the Bolt Search is used to select the bolts.

Bolt Size / Threads Per Inch: These fields are completed automatically when a bolt size is selected from the Bolt Search.

Bolt Radius: The radial distance from the connection centerline to the center of the bolts.

Moment Arm: The radial distance from the effective clamp-hub reaction circle to the circle on which the load HG acts. If Full Face is selected under "Gasket Type," this value is zero.

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.

Hot Stress: The material allowable stress at the temperature listed for the external pressure condition. When a 3.5:1 safety factor is specified in the vessel screen, this value comes from Section II, Part D (Table 1A for Ferrous Materials, Table 1B for Non-Ferrous Materials, and Table 3 for Bolting). If a 4:1 safety factor is specified, this value is calculated based on the ultimate strength from Table U in Section II, Part D; furthermore, the value is limited to the values listed in the allowable stress tables for yield and creep governed cases. In cases where the temperature listed for the internal pressure condition exceeds the highest temperature entry for this material’s stress line, the value will be zero. Manually editing this field will inform the software that the user is defining the material differently than what is stored in the database and the connection to the material in the database will be severed. This is indicated by the “Unlisted Material” caption.

Cold Stress: The material allowable stress at 70 °F (20 °C). When a 3.5:1 safety factor is specified in the vessel screen, this value comes from Section II, Part D (Table 1A for Ferrous Materials, Table 1B for Non-Ferrous Materials, and Table 3 for Bolting). If a 4:1 safety factor is specified, this value is calculated based on the ultimate strength from Table U in Section II, Part D; furthermore, the value is limited to the values listed in the allowable stress tables for yield and creep governed cases. Manually editing this field will sever the connection to the material in the database as indicated by the “Unlisted Material” caption.