Rmclach
Mechanical
- Feb 6, 2015
- 8
A pressure vessel is designed, manufactured and certified in accordance with ASME Section VIII, Division 1. This pressure vessel contains a forged proprietary bolting pad that is welded into the pressure boundary of the vessel. The proprietary bolting pad has a gage bolted to it that is designed by the gage manufacturer and listed with UL.
Per U-1(e)(3), “Pressure retaining covers for vessel openings, such as manhole or handhole covers, and bolted covers with their attaching bolting and nuts” are included within the scope of the design.
Per U-1(e)(4), “the first sealing surface for proprietary fittings or components for which rules are not provided by this Division, such as gages, instruments, and nonmetallic components.” are included within the scope of the design.
Per UG-12(a), “Bolts and studs may be used for the attachment of removable parts. Specifications, supplementary rules, and maximum allowable stress values for acceptable bolting materials are given in the tables referenced in UG-23.”
Per UG-120(e), Pressure retaining covers and their attaching bolting and nuts shall be listed in the Remarks section of the Manufacturer’s Data Report or on an attached Form U-4 when required. The minimum information shall include the material specification, material grade, size, and thread designation.
The scope of the Code on this vessel ends at the first sealing surface for proprietary fittings or components as stated in U-1(e)(4). As this is the case does the bolting specification need to be ASME or is this outside the scope of Section VIII, Division 1? Why?
Thanks,
Ryan
Per U-1(e)(3), “Pressure retaining covers for vessel openings, such as manhole or handhole covers, and bolted covers with their attaching bolting and nuts” are included within the scope of the design.
Per U-1(e)(4), “the first sealing surface for proprietary fittings or components for which rules are not provided by this Division, such as gages, instruments, and nonmetallic components.” are included within the scope of the design.
Per UG-12(a), “Bolts and studs may be used for the attachment of removable parts. Specifications, supplementary rules, and maximum allowable stress values for acceptable bolting materials are given in the tables referenced in UG-23.”
Per UG-120(e), Pressure retaining covers and their attaching bolting and nuts shall be listed in the Remarks section of the Manufacturer’s Data Report or on an attached Form U-4 when required. The minimum information shall include the material specification, material grade, size, and thread designation.
The scope of the Code on this vessel ends at the first sealing surface for proprietary fittings or components as stated in U-1(e)(4). As this is the case does the bolting specification need to be ASME or is this outside the scope of Section VIII, Division 1? Why?
Thanks,
Ryan