scope:

Geometric Scope of the Pressure Vessel

(a) The geometric scope of this Section shall, as a minimum, include the pressure-containing parts of pressure vessels up to and including the following:

(1) the first threaded joint for threaded connections.

(2) the face of the first flange for flanged connections.

(3) the first sealing surface for proprietary connections or fittings for which rules are not provided for in this Section.

(4) the welding end connection for the first circumferential joint forwelded connections to attached piping, valves, and instruments, etc.

(5) the welding pad for attachment of any external nonpressure attachments such as shipping frames, and handling points, etc. Parts welded to these pads need not comply with TG-110.1(b).

(6) pressure-retaining permanent covers and closures, including seals, bolting, and other mechanical retainers at openings.

(b) Where nonpressure parts are directly welded to the pressure-retaining surface of a pressure vessel, this scope shall include the material, design, fabrication, and testing requirements established for nonpressure attachments by the applicable paragraphs of this Section.

(c) Items in addition to the pressure vessel transform the vessel into a tank. These items are addressed in the applicable Modal Appendix.

Physical Scope of the Pressure Vessel

(a) Internal pressure shall be in the range from 0 to 207 bar (full vacuum to 3,000 psig).

(b) The temperature range shall be from −269°C to 343°C (−452°F to 650°F).

(c) Thickness of shells and heads shall not exceed 38 mm (1½ in.).