API RP 934-E

Description

This recommended practice (RP) includes materials and fabrication requirements for new 1¼Cr-½Mo and 1Cr ½Mo steel pressure vessels including heat exchanger shells and channels for elevated temperature service. It applies to vessels that are designed, fabricated, and documented in accordance with ASME Code Section VIII, Division 1 or Division 2 (hereafter referred to as “Code”). This document may also be used as a resource when planning to modify existing pressure vessels. The interior surfaces of these pressure vessels and heat exchangers (i.e. the surfaces exposed to the process) may or may not have an austenitic stainless steel (SS), ferritic SS, or nickel alloy weld overlay or cladding to provide additional corrosion resistance. Some 1¼Cr-½Mo and 1Cr-½Mo components with thicknesses greater than 4 in. (100 mm) have been shown to have difficulty meeting the Code toughness requirements. This RP is primarily intended for wall thicknesses less than 4 in. (100 mm), and a preferred op