GB / T 19672-2005 modify the use of ISO14313: 1999 "oil and gas industry pipeline transportation system pipe valves" / API 6D: 2002 "Pipeline Valves" and enacted. Standard specifies the connection flange connections and welding gate valve, ball valve, check valve, and plug valves of the terminology, structure type and parameters, ordering requirements, technical requirements, materials, inspection rules, test methods, marking and so on. Apply to nominal pressure PN16 ~ PN420, nominal size DN15 ~ DN1200 natural gas and oil pipelines used for gate valve, ball valve, check valve, and plug valves.
GB / T 19672 and ISO 14313/API 6D The main difference between the following points:
(1) standards prepared in a format according to GB / T 1.1-2000 requirements, and ISO / API standards for different.
(2) international standard terminology and definitions used part of it.
(3) The increase in nominal pressure PN16, PN25, PN40.
(4) The modified order required content.
(5) an increase greater than the length of the size of the structure of DN1000 ball.
(6) an increase of the shell valve connecting bolts thread requirements.
(7) according to the provisions of our regulatory requirements and inspection requirements for welding.
(8) provides for the valve inspection rules.
GB / T 19672 main content description:
(1) Terminology
On the full bore valve, reduced bore valves, necking valves, one-way valve, two-way valves, locking device to explain. In order to accurately use the standard the requirements.
(2) structure
Shows the long-distance pipeline used for gate valve, ball valve, plug valve, check valve structure and connection of the typical form.
(3) Pressure - temperature rating
Valves used in shell material in line with the provisions of GB 9131, GB 9131 standards for application of pressure - temperature of the base.
(4) the length of the structure
Abroad, the length of the pipeline structure of the valve structure with access to API 6D length requirements, standards according to the length of the structure of API 6D, in order to swap the valve. Right end for welding to connect the other end of the structure of the valve flange connection length are required.
(5) The diameter of the said
Reference to API 6D representation of the path of the valve nominal size and the actual channel diameter provides representation. To facilitate the distinction: full bore valve, reduced bore valves, necking valves, clearly demonstrated the valve nominal size (the same as with the pipe) and the actual channel diameter.
(6) the minimum diameter and channel shape
For long-distance pipeline to clear the clean-up requirements, refer to API 6D valves are listed in the smallest channel, and channel cross-sectional shapes regulated.
(7) Structural requirements
Affect the performance of long-distance pipeline valves and operational use of the structure makes provision for the requirements. Provides for the operation of pipeline valve torque and performance requirements.
(8) Materials
Lists the commonly used varieties of valve shell materials, anti-corrosion treatment measures sulfur requirements, hardness requirements. Valve welding and repair welding requirements.
(9) Test
API 6D valves with reference to the various types of test content, test requirements and test methods for holding pressure time was provided.
The standard valve by the National Standardization Technical Committee (SAC/TC188) focal point. August 1, 2005 start.