line pipe

Seamless Pipe for Transferring Oil and Gas

Seamless Line Pipe

Standard: API Spec 5L GB/T9711 ASTM A53 ASTM A106

Uses: It is used for conveying gas,water,and petroleum of both the oil and natural gas industries & sour environment.

Seamless pipe, available with the ends plain, beveled, grooved, expanded, flanged, or threaded; principally used to convey gas, oil or water.

Line Pipe Grade:

Standard	Grade	Remarks
API5L PSL1	B、X42、X46、X52、X56、X60、X65、X70
API5L PSL2	BN、X42N、X46N、X52N、X56N、X60N、X65Q、X70Q、X80Q
API5L PSL2(Annex H)	BNS、BQS、X42NS、X42QS、X46NS、X46QS、X52NS、X52QS、X56QS、X60QS、X65QS、X70QS	PIPE FOR SOUR SERVICE
API5L PSL2(Annex J)	BNO、BQO、X42NO、X42QO、X46NO、X46QO、X52NO、X52QO、X56QO、X60QO、X65QO、X70QO、X80QO	OFFSHORE LINE PIPE
GB9711	L245N、L290N、L320N、L360N、L390N、L415N、L450Q、L485Q、L555Q
ASTM A53	Grade A、Grade B、
ASTM A106	Grade A、Grade B、Grade C

API 5L X Grades:

Grade	Chemical Composition								Yield Strength	Tensile Strength	Yield to Tensile	Elongation
	C	Si	Mn	P	S	V	Nb	Ti	min. (KSI)	min. (KSI)	Ratio (max)	%
API 5L X52	0.16	0.45	1.65	0.020	0.010	0.07	0.05	0.04	52	66	0.93	21
API 5L X56	0.16	0.45	1.65	0.020	0.010	0.07	0.05	0.04	56	71	0.93	19
API 5L X60	0.16	0.45	1.65	0.020	0.010	0.08	0.05	0.04	60	75	0.93	19
API 5L X65	0.16	0.45	1.65	0.020	0.010	0.09	0.05	0.06	65	77	0.93	18
API 5L X70	0.17	0.45	1.75	0.020	0.010	0.10	0.05	0.06	70	82	0.93	17

Line Pipe Size:

Nominal Pipe Size		Outside Diameter	Nominal Wall Thickness
Nominal Pipe Size		Outside Diameter	Nominal Wall Thickness
DN	INCH	ASME	SCH 10	SCH 20	SCH 30	STD	SCH 40	SCH 60	XS	SCH 80	SCH 100	SCH 120	SCH 140	SCH1 60	XXS
15	1/2"	21.3	2.11		2.41	2.77	2.77		3.73	3.73				4.78	7.47
20	3/4"	26.7	2.11		2.41	2.87	2.87		3.91	3.91				5.56	7.82
25	1"	33.4	2.77		2.9	3.38	3.38		4.55	4.55				6.35	9.09
32	1.1/4"	42.2	2.77		2.97	3.56	3.56		4.85	4.85				6.35	9.7
40	1.1/2"	48.3	2.77		3.18	3.68	3.68		5.08	5.08				7.14	10.15
50	2"	60.3	2.77		3.18	3.91	3.91		5.54	5.54				8.74	11.07
65	2.1/2"	73	3.05		4.78	5.16	5.16		7.01	7.01				9.53	14.02
80	3"	88.9	3.05		4.78	5.49	5.49		7.62	7.62				11.13	15.25
90	3.1/2"	101.6	3.05		4.78	5.74	5.74		8.08	8.08
100	4"	114.3	3.05		4.78	6.02	6.02		8.56	8.56		11.13		13.49	17.12
125	5"	141.3	3.4			6.55	6.55		9.53	9.53		12.7		15.88	19.05
150	6"	168.3	3.4			7.11	7.11		10.97	10.97		14.27		18.26	21.95
200	8"	219.1	3.76	6.35	7.04	8.18	8.18	10.31	12.7	12.7	15.09	18.26	20.62	23.01	22.23
250	10"	273	4.19	6.35	7.8	9.27	9.27	12.7	12.7	15.09	18.26	21.44	25.4	28.58	25.4
300	12"	323.8	4.57	6.35	8.38	9.53	10.31	14.27	12.7	17.48	21.44	25.4	28.58	33.32	25.4
350	14"	355.6	6.35	7.92	9.53	9.53	11.13	15.09	12.7	19.05	23.83	27.79	31.75	35.71
400	16"	406.4	6.35	7.92	9.53	9.53	12.7	16.66	12.7	21.44	26.19	30.96	36.53	40.19
450	18"	457.2	6.35	7.92	11.13	9.53	14.27	19.05	12.7	23.83	39.36	34.93	39.67	45.24
500	20"	508	6.35	9.53	12.7	9.53	15.09	20.62	12.7	26.19	32.54	38.1	44.45	50.01
550	22"	558.8	6.35	9.53	12.7	9.53		22.23	12.7	28.58	34.93	41.28	47.63	53.98
600	24"	609.6	6.35	9.53	14.27	9.53	17.48	24.61	12.7	30.96	38.89	46.02	52.37	59.54
650	26"	660.4	7.92	12.7		9.53			12.7
700	28"	711.2	7.92	12.7	15.88	9.53			12.7
750	30"	762	7.92	12.7	15.88	9.53			12.7
800	32"	812.8	7.92	12.7	15.88	9.53	17.48		12.7
850	34"	863.6	7.92	12.7	15.88	9.53	17.48		12.7
900	36"	914.4	7.92	12.7	15.88	9.53	19.05		12.7
950	38"	965.2				9.53			12.7
1000	40"	1016				9.53			12.7
1050	42"	1066.8				9.53			12.7

What Is Line Pipe?

Line pipe is manufactured from high-strength carbon steel, and is made to strict engineering and metallurgical specifications developed by the American Petroleum Institute (API).

One particular standard, API Specification 5L, defines requirements for pipe made to transport natural gas, oil and water. This specification includes standards for the dimensional, physical, mechanical, and chemical properties of the carbon steel. Several pipe mills around the world manufacture API 5L line pipe for the natural gas industry.

The Classification of Line Pipe

Pipe mills produce two types of line pipe: seamless and welded. Seamless pipe is formed from a cylindrical bar of steel that is heated to a very high temperature and then is pierced with a probe to create the hole through the cylinder. Rollers size the cylinder to produce the proper diameter and wall thickness. This technique is used to make small diameter pipe, from 0.5 inches to 24 inches in diameter.
Most pipe produced for interstate natural gas pipelines is the welded variety, because interstate systems require larger diameter pipe. Pipe mills manufacture line pipe by forming a steel plate or coil into a cylindrical shape, and closing the seam using a welding process. The mill evaluates the quality of the weld seam using ultrasonic and/or radiological inspection methods and pressure tests each joint of pipe to levels significantly higher than the eventual operating pressure of the pipeline.
The pipe is further tested to ensure that it meets all requirements of steel chemistry, strength and toughness, and dimensional characteristics. Mills that produce line pipe to API specifications meet the most stringent criteria for steel making and pipe production technologies to ensure safe, reliable pipeline service. The gas pipeline industry maintains the manufacturing and test records of the pipe for the life of the pipeline.

Pipeline Size and Design

The size of interstate pipelines varies, but in most cases a mainline, the principal pipeline that delivers natural gas, ranges from 16 to 48 inches in diameter. Other smaller pipelines called laterals deliver gas to the mainline or take gas from the mainline and range from six to 16 inches in diameter. The volume of gas to be delivered and the pressure at which the pipeline will be operated determines the pipeline’s ultimate diameter. In order to meet customer delivery requirements most interstate gas pipelines operate at a pressure of at least 600 pounds per square inch, but typically at about 1,000 psi.

The thickness of the pipeline is determined by the maximum operating pressure, and is based on published industry standards and federal regulations.

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