An overview of china‘s specification for Casing and Tubing  API

China Specification for Casing and tubing api: An Overview of China’s Specification for Casing and Tubing API China has become a major player in the global Oil and gas industry, and as such, it has developed its own set of specifications for casing and tubing API. These specifications are designed to ensure the quality and safety of the equipment used in the extraction and transportation of oil and gas. In this article, we will provide an overview of China’s specification for casing and tubing API, highlighting its key features and importance in the industry.

api 5ct L80 casing tubing grade Color codes
Grade	Grade type	Number and Color of Bands for Product a with Length ³ 1.8 m	Color(s) for couplings
			Entire Coupling	Band(s) b, c
1	2	3	4	5
H40	—	None or black band at the manufacturer’s option	None	Same as for Pipe
J55 Tubing	—	One bright green	Bright green	None
J55 Casing	—	One bright green	Bright green	One white
K55	—	Two bright green	Bright green	None
N80	1	One red	Red	None
N80	Q	One red, one bright green	Red	Green
R95	—	One brown	Brown	None
L80	1	One red, one brown	Red	One brown
L80	9Cr	One red, one brown, two yellow	None	Two yellow
L80	13Cr	One red, one brown, one yellow	None	One yellow
C90	1	One purple	Purple	None
T95	1	One silver	Silver	None
C110	—	One white, two brown	White	Two brown
P110	—	One white	White	None
Q125	1	One orange	Orange	None
a In the case of coupling material, unless otherwise specified in the purchase agreement, the manufacturer’s internal requirements shall govern.
b Special clearance couplings shall also have a black band.
c Seal-ring couplings shall also have a blue band.

China’s specification for casing and tubing API is based on the American petroleum Institute (API) standards, which are widely recognized and used in the global oil and gas industry. however, China has made some modifications and additions to these standards to suit its specific needs and requirements. These modifications are aimed at improving the performance and reliability of casing and tubing used in China’s oil and gas fields. J55 Tubing One of the key features of China’s specification for casing and tubing API is the requirement for higher strength and toughness. China’s oil and gas fields are often characterized by harsh operating conditions, such as high pressure and temperature, corrosive environments, and abrasive fluids. Therefore, the casing and tubing used in these fields need to be able to withstand these conditions without failure. China’s specification addresses this by setting higher minimum yield strength and minimum tensile strength requirements for casing and tubing. Another important aspect of China’s specification for casing and tubing API is the requirement for improved corrosion resistance