Scope and Definitions
ASME B31.3-2008
300 GENERAL STATEMENTS
- (a) Identification. This Process Piping Code is a
Section of the American Society of Mechanical Engineers
Code for Pressure Piping, ASME B31, an American
National Standard. It is published as a separate document
for convenience of Code users.
(1) Owner. The owner of a piping installation shall
have overall responsibility for compliance with this
Code, and for establishing the requirements for design,
construction, examination, inspection, and testing
which will govern the entire fluid handling or process
installation of which the piping is a part. The owner is
also responsible for designating piping in certain fluid
services and for determining if a specific Quality System
is to be employed. [See paras. 300(d)(4), (d)(5), (e), and
Appendix Q.]
(2) Designer. The designer is responsible to the
owner for assurance that the engineering design of piping
complies with the requirements of this Code and
with any additional requirements established by the owner.
(3) Manufacturer, Fabricator, and Erector. The manufacturer,
fabricator, and erector of piping are responsible
for providing materials, components, and workmanship
in compliance with the requirements of this Code and
of the engineering design.
(4) Owner’s Inspector. The owner’s Inspector (see
para. 340) is responsible to the owner for ensuring that
the requirements of this Code for inspection, examination,
and testing are met. If a Quality System is specified
by the owner to be employed, the owner’s Inspector is
responsible for verifying that it is implemented.
(c) Intent of the Code
(1) It is the intent of this Code to set forth engineering
requirements deemed necessary for safe design
and construction of piping installations.
(2) This Code is not intended to apply to the operation,
examination, inspection, testing, maintenance, or
repair of piping that has been placed in service. The
provisions of this Code may optionally be applied for
those purposes, although other considerations may also
be necessary.
(3) Engineering requirements of this Code, while
considered necessary and adequate for safe design, generally
employ a simplified approach to the subject. A
designer capable of applying a more rigorous analysis
shall have the latitude to do so; however, the approach
must be documented in the engineering design and its
validity accepted by the owner. The approach used shall
provide details of design, construction, examination,
inspection, and testing for the design conditions of para.
301, with calculations consistent with the design criteria
of this Code.
(4) Piping elements should, insofar as practicable,
conform to the specifications and standards listed in
this Code. Piping elements neither specifically approved
nor specifically prohibited by this Code may be used
provided they are qualified for use as set forth in applicable
Chapters of this Code.
(5) The engineering design shall specify any
unusual requirements for a particular service. Where
service requirements necessitate measures beyond those
required by this Code, such measures shall be specified
by the engineering design. Where so specified, the Code
requires that they be accomplished.
(6) Compatibility of materials with the service and
hazards from instability of contained fluids are not
within the scope of this Code. See para. F323.
(d) Determining Code Requirements
(1) Code requirements for design and construction
include fluid service requirements, which affect selection
and application of materials, components, and joints.
Fluid service requirements include prohibitions, limitations,
and conditions, such as temperature limits or a
requirement for safeguarding (see para. 300.2 and
Appendix G). Code requirements for a piping system
are the most restrictive of those which apply to any of
its elements.
(2) For metallic piping not in Category M or high
pressure fluid service, Code requirements are found in
Chapters I through VI (the base Code), and fluid service
requirements are found in
(a) Chapter III for materials
(b) Chapter II, Part 3, for components
(c) Chapter II, Part 4, for joints
(3) For nonmetallic piping and piping lined with
nonmetals, all requirements are found in Chapter VII.
(Paragraph designations begin with “A.”)
(4) For piping in a fluid service designated by the
owner as CategoryM(see para. 300.2 and Appendix M),
all requirements are found in Chapter VIII. (Paragraph
designations begin with “M.”)
(5) For piping in a fluid service designated by the
owner as Category D (see para. 300.2 and Appendix M),
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