LITTLE P.ENG. FOR ENGINEERING CONSULTANCY SERVICES

The design minimum temperature is required to determine the impact test requirements of ASME B31.3. As the temperature is decreased, the notch toughness of the material drops. Thus, impact tests are required under conditions of sufficiently low temperature and high stress to ensure that the material has adequate toughness to avoid a brittle fracture. In establishing the minimum temperature, one must consider the lowest component temperature that can be expected in service. T

In lines for high-temperature fluid solids (e.g., in fluid catalytic cracking units), it is sometimes necessary to calculate the metal temperature with an internal, insulating refractory lining. In this case, the metal temperature may be significantly less than the fluid temperature. The refractory lining resists erosion while at the same time permitting use of carbon steel with a fluid that would otherwise be prohibitively hot for its use. Note that the metal temperature is

Chapter IV of the Code, Standards for Piping Components, tabulates the listed standards. Listed piping components are those that are in accordance with the standards listed in Table 326.1. Metallic pipe and tube listed in Appendix A are also considered to be listed components; they are included by note 5 in the table. Components that do not comply with those standards are considered to be unlisted components. Note that listed components for Chapter VII (nonmetallic) are liste

The ASME B31.3 Code has certain organizational features that, when understood, make it easier to follow. The Code consists of nine chapters. The first six chapters are what is called the base Code. It provides the basic piping Code requirements for Normal and Category D fluid service metallic piping. Chapter VII contains rules for nonmetallic piping and additional requirements for metallic piping lined with nonmetals. Chapter VIII contains rules for piping in Category M Fluid

The B31.3 Section Committee responds to all questions on the Code via an inquiry process. Instructions for writing a request for an interpretation are provided in ASME B31.3, Appendix Z. The Committee will provide a strict interpretation of the existing rules. However, as a matter of policy, the Committee will not approve, certify, rate, or endorse anything, nor will it act as a consultant on specific engineering problems or the general understanding or application of Code ru