Line pipe grade comparison

Line pipe grade comparison table L245 L290 L450

Steel grade comparison table

Part I of the petroleum and natural gas industries-steel tubes technical delivery conditions: grade a steel pipe (GB/T9711.1) under the steel grade with ANSI/API Spec 5L[1] specified in steel grade comparison chart:

Grade(GB/T9711.1)	L175 (Ⅰ、Ⅱ)	L210	L245	L290	L320	L360	L390	L415	L450	L485	L555
Grade(ANSI/API Spec 5L[1])	A25 (Ⅰ、Ⅱ)	A	B	X42	X46	X52	X56	X60	X65	X70	X80
Total elongation under stress Rt0.5（min）Mpa	175	210	245	290	320	360	390	415	450	485	555
Tensile strength (min)Mpa	315	335	415	415	435	460	490	520	535	570	625

Tubes dimensions weight

• Non-threaded steel pipe weight formula
• M = 0.024 661 5（D-T）T
• Type: m-Threadless steel tube weight per unit length kg/m;
• D-diameter mm
• T-pipe wall thickness mm
• Coefficient of density is used in 7.85kg/dm3

Weight per unit length table (kg/m)

Wall thickness (mm)		5	6	7	8
Wall thickness tolerance	+15	5.75	6.9	8.05	9.2
	-12.5	4.375	5.25	6.125	7
Outer diameter (mm)	219	26.39	31.52	36.60	41.63
	273	33.05	39.51	45.92	52.28
	325	39.46	47.20	54.90	62.54
	426	51.91	62.15	72.33	82.47

Determining the wall thickness of

• Gas transmission pipeline based on the following formula:
• Type: d-pipe wall thickness (mm)
• P-design pressure (MPA)
• D-pipe outer diameter (mm)
• SS-minimum yield strength of the steel tube (MPA)
• F-strength design factors
• J-weld coefficient is 1.0
• T-temperature reduction factor, for 1.0
• Non-threaded steel pipe weight formula

Wall thickness calculation sheet (mm)

Category	Pipe outer diameter (mm)	Design pressure (MPa)	Code for design of urban lit		Design code for pipelines
			Pipe grade		Pipe grade
			X42	X52	X42	X52
Three kinds of areas	325	2.5	3.50	2.82
		3.0	4.20	3.81	3.36	2.71
		4.0	5.60	4.51
	426	2.5	4.59	3.70
		3.0	5.51	4.44	4.41	3.55
		4.0	7.34	5.92
	508	2.5	5.47	4.41
		3.0	6.57	5.29	5.26	4.23
		4.0	8.76	7.06	7.01	5.65
Four categories of area	325	2.5	4.67	3.76	3.50	2.82
		3.0	5.60	4.51	4.20	3.39
		4.0	7.47	6.02	5.60	4.51
	426	2.5	6.12	4.93	4.59	3.70
		3.0	7.34	5.92	5.51	4.44
		4.0	9.79	7.89	7.34	5.92
	508	2.5	7.30	5.88	5.47	4.41
		3.0	8.76	7.06	6.57	5.29
		4.0	11.68	9.41	8.76	7.06

• Note: 1, the design of city gas specifications: three kinds of strength coefficient of 0.4, four categories of area was 0.3;
• Note: 2, pipeline engineering design specifications: three kinds of strength coefficient of 0.5, four areas as 0.4.

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