Draft Details

1.1 General

This Standard covers steel valves primarily intended for use in oil or gas pipeline systems. The Scope as presented within the valve reference standard(s) takes precedence without restriction insofar as there is no conflict with the governing installation code and this Standard as agreed to with the purchaser. The valve reference standards, which have been adopted in their entirety, are as per the following except as noted within this Standard. This Standard provides modification or additional content as deemed applicable by the user:

a) API 6D;

b) API 599;

c) API 600;

d) API 602;

e) API 608; and

f) API 609.

Note: Items a) to f) all default to ASME B16.34 for pressure/temperature ratings, materials, and other basic elements of valve design and construction.

1.2 Size, nominal pressure class, and category

1.2.1 Size

This Standard covers valves in the sizes specified in the scope of the valve reference standards. (See Clause 5.3 and informative Table A.1)

1.2.2 Nominal pressure class

This Standard covers valves in the scope of the valve reference standards. (See Clause 5.2 and informative Table B.1).

1.2.3 Category

This Standard covers valves in the following categories:

a) Category I: valves without requirements for proven notch-toughness properties (for design temperatures at or above –29 °C); and

b) Category II: valves with requirements for proven notch-toughness properties (for design temperatures at or above –45 °C).

Note: This Standard is not applicable for temperatures below –45 °C.

1.3 Terminology

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.