API 5L PIPE SPECIFICATION-API PIPE SIZE CHARTS

TUSPIPE offers multiple grades of API 5L pipes, each meeting the mechanical properties required by the API 5L standard. This rigorous control over pipe performance ensures that every steel pipe you encounter is perfect.

API 5L

API 5L is a standard specification for line pipe that which American Petroleum Institute (API) develops and it provides the requirements for the manufacture of two product levels ( PSL1 그리고 PSL2) of seamless and welded steel pipe for the use of the global petroleum industry, especially in the transport of crude oil, natural gas, and water.

API 5L specification 46th Edition, initially published in 1965, outlines chemical, mechanical, and hydrostatic testing criteria. Manufacturers must meet API pipe standards requirements and undergo audits to obtain a license for API 5L compliance, allowing them to showcase the API monogram on their products. License renewal every three years ensures continued adherence to quality assurance programs.

Thankfully, TUSPIPE has an API standard certificate and our api 5l consistently follows this standard!

API 5L Pipe Grands-GRADE A,B

API 5L Pipe Steels

API 5L Pipe Standards-PSL 1,2

In the following, we will talk about the dimensions/mechanical properties/chemical composition/wall thickness of API 5L pipes and the pipe experimental data, etc. In order to make it easier for you to understand, we have divided the pipe data into two tables, PSL-1 and PSL-2. Hope it can help you!

Steel Grades of API 5L

API’s steel grades for line pipe standardize material chemistry and mechanical properties, ensuring adherence to set requirements. Common API 5L grade B, X42, X52, X60, and X65, with the number following ‘X’ denoting minimum yield strength in PSL. Typically used in oil and gas transport, line pipes find applications in water transport, construction, and various industries, emphasizing the importance of steel grades in selecting suitable materials.”

API 5L transporting categories A, B, or X fluids must be constructed from steel materials that have an area under the stress-strain curve that meets the requirements specified in the material standard. The API 5L specified minimum yield and tensile strengths “represent the point on the Stress

There are multiple grades of API 5L available, each with different yield strength and tensile strength ratings. The most common grades for API 5L line pipes are:

Dimensions and Size RANGE of API 5L(SCHEDULE CHART)

Before purchasing an API 5L , it is important to check the size and dimensions of the line pipe to ensure that it meets the required standards. The dimensions and masses of API 5L are specified in ISO 4200 and ASME B36.10M. These standards provide a guide for different size API 5L pipes and specify the wall thickness of each size. To check if a particular pipe meets the required standards, refer to these tables. Doing so will help to ensure that the pipe is the right size and has the correct wall thickness.

NPS		O. D.	W. T.
DN	인치	mm	SCH5S	SCH10S	SCH10	SCH20	SCH30	SCH40	SCH60	SCH80	SCH100	SCH120	SCH140	SCH160	Sth	XS	XXS
50	2″	60.3	1.65	2.77	-	-	-	3.91	-	5.54	-	-	-	8.74	3.91	5.54	11.07
65	2 1/2″	73	2.11	3.05	-	-	-	5.16	-	7.01	-	-	-	9.53	5.16	7.01	14.02
80	3″	88.9	2.11	3.05	-	-	-	5.49	-	7.62	-	-	-	11.13	5.49	7.52	15.24
90	3 1/2″	101.6	2.11	3.05	-	-	-	5.74	-	8.08	-	-	-	-	5.74	8.08	-
100	4″	114.3	2.11	3.05	-	-	-	6.02	-	8.58	-	11.13	-	13.49	6.02	8.56	17.12
125	5″	141.3	2.77	3.4	-	-	-	6.55	-	9.53	-	12.7	-	15.88	6.55	9.53	18.05
150	6″	168.3	2.77	3.4	-	-	-	7.11	-	10.97	-	14.27	-	18.26	7.11	10.97	21.95
200	8″	219.1	2.77	3.76	-	6.35	7.04	8.18	10.31	12.7	15.09	18.26	20.62	23.01	8.18	12.7	22.23
250	10″	273.1	3.4	4.19	-	6.35	7.8	9.27	12.7	15.09	18.26	21.44	25.4	28.58	9.27	12.7	25.4
300	12″	323.9	3.96	4.57	-	6.35	8.38	10.31	14.27	17.48	21.44	25.4	28.58	33.32	9.53	12.7	25.4
350	14″	355.5	3.96	4.78	6.35	7.92	9.53	11.13	15.09	19.05	23.83	27.79	31.75	35.71	9.53	12.7	-
400	16″	406.4	4.19	4.78	6.35	7.92	9.53	12.7	16.66	21.44	26.19	30.96	36.53	40.49	9.53	12.7	-
450	18″	457.2	4.19	4.78	6.35	7.92	11.13	14.27	19.05	23.83	39.36	34.93	39.67	45.24	-	-	-
500	20″	508	4.78	5.54	6.35	9.53	12.7	15.09	20.62	26.19	32.54	38.1	44.45	50.01	-	-	-
550	22″	558.8	4.78	5.54	6.35	9.53	12.7	-	22.23	28.58	34.93	41.28	47.63	53.98	-	-	-
600	24″	609.6	5.54	6.35	6.35	9.53	14.27	17.48	24.61	30.96	38.89	46.02	52.37	59.54	-	-	-

Chemical composition of API 5L

The chemical composition of API 5L pipe contains the content of each element as well as carbon equiva, in addition, TUSPIPE also categorizes the chemical composition into API 5L seamless pipe and welded pipe two kinds of process demonstration, I hope it can help you!

- API 5L PSL 1 Chemical Component

강철 등급	Mass fraction, % based on heat and product analyses a,g
	C	Mn	P	S	V	Nb	Ti
	최대	최대	최대	최대	최대	최대	최대
심리스 파이프
A	0.22	0.9	0.03	0.03	-	-	-
B	0.28	1.2	0.03	0.03	c,d	c,d	d
X42	0.28	1.3	0.03	0.03	d	d	d
X46	0.28	1.4	0.03	0.03	d	d	d
X52	0.28	1.4	0.03	0.03	d	d	d
X56	0.28	1.4	0.03	0.03	d	d	d
X60	0.28 e	1.40 e	0.03	0.03	f	f	f
X65	0.28 e	1.40 e	0.03	0.3	f	f	f
X70	0.28 e	1.40 e	0.03	0.03	f	f	f
용접 파이프
A	0.22	0.9	0.03	0.03	-	-	-
B	0.26	1.2	0.03	0.03	c,d	c,d	d
X42	0.26	1.3	0.03	0.03	d	d	d
X46	0.26	1.4	0.03	0.03	d	d	d
X52	0.26	1.4	0.03	0.3	d	d	d
X56	0.26	1.4	0.3	0.03	d	d	d
X60	0.26 e	1.40 e	0.03	0.03	f	f	f
X65	0.26 e	1.45 e	0.03	0.03	f	f	f
X70	0.26e	1.65 e	0.03	0.03	f	f	f
a. Cu ≤ = 0.50% Ni; ≤ 0.50%; Cr ≤ 0.50%; 및 Mo ≤ 0.15%, b. 탄소의 경우 지정된 최대 농도보다 0.01% 감소할 때마다 Mn의 경우 지정된 최대 농도보다 0.05% 증가가 허용되며, L245 또는 B 등급 이상이지만 L360 또는 X52 이하인 경우 최대 1.65%까지, L360 또는 X52 초과이지만 L485 또는 X70 미만인 경우 최대 1.75%까지, L485 또는 X70 등급인 경우 최대 2.00%까지 허용됩니다, c. 달리 합의되지 않는 한 NB + V ≤ 0.06%, d. Nb + V + TI ≤ 0.15%, e. 달리 동의하지 않는 한.., f. 달리 합의되지 않는 한, NB + V = Ti ≤ 0.15%, g. 고의적인 B 추가는 허용되지 않으며 잔류 B ≤ 0.001%입니다.

- API 5L PSL 2 Chemical Component

강철 등급	질량 분율, 열 및 제품 분석에 기반한 %																		탄소 이퀄라이저
	C		Si		Mn		P		S		V		Nb		Ti		기타		CE IIW	CE Pcm
	최대		최대		최대		최대		최대		최대		최대		최대		기타		최대	최대
Seamless Pipe
BR	0.24		0.4		1.2		0.025		0.015		c		c		0.04		e,l		0.043	0.25
X42R	0.24		0.4		1.2		0.025		0.015		0.06		0.05		0.04		e,l		0.043	0.25
BN	0.24		0.4		1.2		0.025		0.015		c		c		0.04		e,l		0.043	0.25
X42N	0.24		0.4		1.2		0.025		0.015		0.06		0.05		0.04		e,l		0.043	0.25
X46N	0.24		0.4		1.4		0.025		0.015		0.07		0.05		0.04		d,e,l		0.043	0.25
X52N	0.24		0.45		1.4		0.025		0.015		0.1		0.05		0.04		d,e,l		0.043	0.25
X56N	0.24		0.45		1.4		0.025		0.015		0.10f		0.05		0.04		d,e,l		0.043	0.25
X60N	0.24f		0.45f		1.40f		0.025		0.015		0.10f		0.05f		0.04f		g,h,l		As agreed
BQ	0.18		0.45		1.4		0.025		0.015		0.05		0.05		0.04		e,l		0.043	0.25
X42Q	0.18		0.45		1.4		0.025		0.015		0.05		0.05		0.04		e,l		0.043	0.25
X46Q	0.18		0.45		1.4		0.025		0.015		0.05		0.05		0.04		e,l		0.043	0.25
X52Q	0.18		0.45		1.5		0.025		0.015		0.05		0.05		0.04		e,l		0.043	0.25
X56Q	0.18		0.45f		1.5		0.025		0.015		0.07		0.05		0.04		e,l		0.043	0.25
X60Q	0.18f		0.45f		1.70f		0.025		0.015		g		g		g		h,l		0.043	0.25
X65Q	0.18f		0.45f		1.70f		0.025		0.015		g		g		g		h,l		0.043	0.25
X70Q	0.18f		0.45f		1.80f		0.025		0.015		g		g		g		h,l		0.043	0.25
X80Q	0.18f		0.45f		1.90f		0.025		0.015		g		g		g		i,j		As agreed
X90Q	0.16f		0.45f		1.9		0.02		0.01		g		g		g		j,k		As agreed
X100Q	0.16f		0.45f		1.9		0.02		0.01		g		g		g		j,k		As agreed
용접 파이프
BM		0.22		0.45		1.2		0.025		0.015		0.05		0.05		0.04		e,l	0.043	0.25
X42M		0.22		0.45		1.3		0.025		0.015		0.05		0.05		0.04		e,l	0.043	0.25
X46M		0.22		0.45		1.3		0.025		0.015		0.05		0.05		0.04		e,l	0.043	0.25
X52M		0.22		0.45		1.4		0.025		0.015		d		d		d		e,l	0.043	0.25
X56M		0.22		0.45f		1.4		0.025		0.015		d		d		d		e,l	0.043	0.25
X60M		0.12f		0.45f		1.60f		0.025		0.015		g		g		g		h,l	0.043	0.25
X65M		0.12f		0.45f		1.60f		0.025		0.015		g		g		g		h,l	0.043	0.25
X70M		0.12f		0.45f		1.70f		0.025		0.015		g		g		g		h,l	0.043	0.25
X80M		0.12f		0.45f		1.85f		0.025		0.015		g		g		g		i,j	.043f	0.25
X90M		0.1		0.55f		2.10f		0.02		0.01		g		g		g		i,j	-	0.25
X100M		0.1		0.55f		2.10f		0.02		0.01		g		g		g		i,j	-	0.25
a. SMLS t>0.787”, CE limits shall be as agreed. The CEIIW limits applied fi C > 0.12% and the CEPcm limits apply if C ≤ 0.12%, b. For each reduction of 0.01% below the specified maximum for C, an increase of 0.05% above the specified maximum for Mn is permissible, up to a maximum of 1.65% for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1.75% for grades > L360 or X52, but < L485 or X70; up to a maximum of 2.00% for grades ≥ L485 or X70, but ≤ L555 or X80; and up to a maximum of 2.20% for grades > L555 or X80., c. 달리 합의되지 않는 한 Nb = V ≤ 0.06%, d. Nb = V = Ti ≤ 0.15%, e. 달리 합의되지 않는 한, Cu ≤ 0.50%; Ni ≤ 0.30% Cr ≤ 0.30% 및 Mo ≤ 0.15%, f. 달리 동의하지 않는 한, g. 달리 합의되지 않는 한, Nb + V + Ti ≤ 0.15%, h. 달리 합의되지 않는 한, Cu ≤ 0.50% Ni ≤ 0.50% Cr ≤ 0.50% 및 MO ≤ 0.50%, i. 달리 합의되지 않는 한, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.50% 및 MO ≤ 0.50%, j. B ≤ 0.004%, k. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.55% and MO ≤ 0.80%, l. 각주 j가 표시된 등급을 제외한 모든 PSL 2 배관 등급의 경우 다음 사항이 적용됩니다. 달리 합의되지 않는 한 의도적인 B의 추가는 허용되지 않으며 잔류 B ≤ 0.001%.

Mechanical Properties of API 5L standards

-PSL-1 Mechanical Properties

파이프 등급	Pipe body of seamless and welded pipes			Weld seam of EW, SAW and COW pip
파이프 등급	Yield strength R10,5MPa(psi) minimum	인장 강도 RmMPa(psi) minimum	신장 Af% minimum	Tensile strength RmMPa(psi) minimum
L175 or A25	175 (25 400)	310 (45 000)	c	310 (45 000)
L175P or A25P	175 (25 400)	310 (45 000)	c	310 (45 000)
L210 or A	210 (30 500)	335 (48 600)	c	335 (48 600)
L245R or BR L245 or B	245 (35 500)	415 (60 200)	c	415 (60 200)
L290R or X42R L290 or X42	290 (42 100)	415 (60 200)	c	415 (60 200)
L320 or X46	320 (46 400)	435 (63 100)	c	435 (63 100)
L360 or X52	360 (52 200)	460 (66 700)	c	460 (66 700)
L390 or X56	390 (56 600)	490 (71 100)	c	490 (71 100)
L415 or X60	415 (60 200)	520 (75 400)	c	520 (75 400)
L450 or X65	450 (65 300)	535 (77 600)	c	535 (77 600)
L485 or X70	485 (70 300)	570 (82 700)	c	570 (82 700)

- API 5L PSL-2 기계적 특성

Pipe grade	Pipe body of seamless and welded pipes						Weld seam of HFW, SAW and COW pipes
	Yield strength Rto,5b MPa (psi)		인장 강도 Rm MPa (psi)		Ratioa,b,c Rto,5/Rm	신장 Af %	인장 강도 Rm MPa (psi)
	minimum	maximum	minimum	maximum	maximum	minimum	minimum
L245R or BR L245N or BN L245Q or BQ L245M 또는 BM	245 (35 500)	450 e (65 300) e	415 (60 200)	760 (110 200)	0,93	f	415 (60 200)
L290R or X42R L290N or X42N L290Q or X42Q L290M 또는 X42M	290 (42 100)	495 (71 800)	415 (60 200)	760 (110 200)	0,93	f	415 (60 200)
L320N or X46N L320Q or X46Q L320M 또는 X46M	320 (46 400)	525 (76 100)	435 (63 100)	760 (110 200)	0,93	f	435 (63 100)
L360N or X52N L360Q or X52Q L360M 또는 X52M	360 (52 200)	530 (76 900)	460 (66 700)	760 (110 200)	0,93	f	460 (66 700)
L390N or X56N L390Q or X56Q L390M 또는 X56M	390 (56 600)	545 (79 000)	490 (71 100)	760 (110 200)	0,93	f	490 (71 100)
L415N or X60N L415Q or X60Q L415M 또는 X60M	415 (60 200)	565 (81 900)	520 (75 400)	760 (110 200)	0,93	f	520 (75 400)
L450Q or X65Q L450M 또는 X65M	450 (65 300)	600 (87 000)	535 (77 600)	760 (110 200)	0,93	f	535 (77 600)
L485Q or X70Q L485M 또는 X70M	485 (70 300)	635 (92 100)	570 (82 700)	760 (110 200)	0,93	f	570 (82 700)
L555Q or X80Q L555M 또는 X80M	555 (80 500)	705 (102 300)	625 (90 600)	825 (119 700)	0,93	f	625 (90 600)
L625M 또는 X90M	625 (90 600)	775 (112 400)	695 (100 800)	915 (132 700)	0,95	f	695 (100 800)
L690M 또는 X100M	690 (100 100)	840 (121 800)	760 (110 200)	990 (143 600)	0,97 g	f	760 (110 200)
L830M 또는 X120M	830 (120 400)	1 050 (152 300)	915 (132 700)	1 145 (166 100)	0,99 g	f	915 (132 700)

api 5l specification:Production Tolerances

This section demonstrates the tolerances of the API 5L piping specification, to which TUSPIPE adheres to produce piping! Here you can see the API 5L specification OD tolerances / API 5L wall thickness tolerances and length tolerances.
In addition, you can also see the frequency and standard of testing of API 5L pipes, TUSPIPE has its own inspection and testing laboratory and supports third-party inspections, as we believe that quality makes all the difference.
We hope that this information will help you to make a better choice of piping

- API 5L Outside Diameter and Out of Roundness Tolerance

Specified Outside Diameter D (in)	Diameter Tolerance, inches d				Out-of-Roundness Tolerance in
	Pipe except the end a		Pipe end a,b,c		Pipe except the End a	Pipe End a,b,c
	SMLS 파이프	용접 파이프	SMLS 파이프	용접 파이프	Pipe except the End a	Pipe End a,b,c
< 2.375	-0.031 to + 0.016		– 0.031 to + 0.016		0.048	0.036
≥2.375 to 6.625	+/- 0.0075D		– 0.016 to + 0.063		0.020D for	0.015D for
					n/t≤75	n/t≤75
					By agreement for	By agreement for
					n/t≤75	n/t≤75
>6.625 to 24.000	+/- 0.0075D	+/- 0.0075D, but max of 0.125	+/- 0.005D, but max of 0.063		0.020D	0.015D
>24 to 56	+/- 0.01D	+/- 0.005D but max of 0.160	+/- 0.079	+/- 0.063	0.015D for but max of 0.060	0.01D for but max of 0.500
					For	For
					n/t≤75	n/t≤75
					By agreement	By agreement
					for	for
					n/t≤75	n/t≤75
>56	As agreed
a. The API 5L pipe end includes a length of 4 in ate each of the pipe extremities
b. For SMLS pipe the tolerance apply for t≤0.984in and the tolerances for the thicker pipe shall be as agreed
c. For expanded pipe with D≥8.625in and for non-expanded pipe, the diameter tolerance and the out-of-roundness tolerance may be determined using the calculated inside diameter or measured inside diameter rather than the specified OD.
d. For determining compliance to diameter tolerance, the pipe diameter is defined as the circumference of the pipe in any circumferential plane divide by Pi.

- API 5L Wall Thickness Tolerances

벽 두께 t mm (in)	Tolerances a mm (in)
Seamless pipe b
≤ 4,0 ( 0.157)	+ 0,6 (0.024) – 0,5 (0.020)
> 4,0 ( 0.157) to <25,0 (0.984)	+ 0,150 – 0,125
≥ 25,0 (0.984)	+3,7 (0.146) or + 0,1 t, whichever is the greater – 3,0 (0.120) or – 0,1 t, whichever is the greater
Welded pipe c, d
≤ 5,0 (0.197)	± 0,5 (0.020)
> 5,0 (0.197) to <15,0 (0.591)	± 0,1 t
≥ 15,0 (0.591)	±1,5 (0.060)

a If the purchase order specifief a minus tolerance for wall thickness smaller than the applicable value given in this table, the plus tolerance for wall thickness shall be increased by an amount sufficient to maintain the applicable tolerance range.

b For API 5L pipe with D ≥ 355,6 mm (14.000 in) and t ≥ 25,0 mm (0.984 in) the wall-thickness tolerance locally may exceed the plus tolerance for wall thickness by an additional 0,05 t, provided that the plus tolerance for mass (see 9.14) is not exceeded.

c The plus tolerance for wall thickness does not apply to the weld area.

d See 9.13.2 for additional restrictions.

- API 5L Length Tolerances

According to the requirements outlined in API 5L, random lengths of line pipe shall be delivered within the tolerances given below, and approximate lengths must be delivered within ± 500 mm (20 in.). Additionally, if the supply of jointers is agreed upon, jointers comprising two pieces welded together to make a length shorter than 15.0 m (49.2 ft) may be furnished to a maximum of 5 % of the order item, or as agreed. Jointers comprising three pieces welded together to make a length 15.0 m (49.2 ft) or longer may also be furnished for the entire order item or any portion thereof, though this is limited to a maximum of 5 % of the order item as well. These requirements ensure that API 5L are of the correct length and can be properly joined together when necessary.

Random length designation	Minimum length	Minimum average length for each order item	Maximum length
m (ft)	m (ft)	m(ft)	m(ft)
Threaded-and-coupled pipe
6 (20)	4.88 (16.0)	5.33 (17.5)	6.86 (22.5)
9 (30)	4.11 (13.5)	8.00 (26.2)	10.29 (33.8)
12 (40)	6.71 (22.0)	10.67 (35.0)	13.72 (45.0)
Plain-end pipe
6 (20)	2.74 (9.0)	5.33 (17.5)	6.86 (22.5)
9 (30)	4.11 (13.5)	8.00 (26.2)	10.29 (33.8)
12 (40)	4.27 (14.0)	10.67 (35.0)	13.72 (45.0)
15 (50)	5.33 (17.5)	13.35 (43.8)	16.76 (55.0)
18 (60)	6.40 (21.0)	16.00 (52.5)	19.81 (65.0)
24 (80)	8.53 (28.0)	21.34 (70.0)	25.91 (85.0)

Inspection Frequency for API 5L

- Inspection Frequency for API 5L PSL 1

No	Type of Inspection	유형	Frequency of Inspection e
1	Heat analysis	All pipe	One analysis per heat of steel
2	제품 분석	SMLS,CW,LFW,HFW,LW.SAW,or COW	Two analyses per heat of steel (taken from separate product items)
3	Tensile testing of the pipe body of welded pipe with D ≤ 48.3 mm(1.900 in.),in Grade L175 or A25	CW, LFW,or HFW	Once per test unit e of not more than 25 tonnes(28 tons) of pipe
4	Tensile testing of the pipe body of welded pipe with D ≤ 48.3 mm(1.900 in.),in Grade L175P or A25P	CW	Once per test unit e of not more than 25 tonnes(28 tons) of pipe
5	Tensile testing of the pipe body of welded pipe with D ＞ 48.3 mm(1.900 in.),in Grade L175 or A25	CW,LFW,or HFW	Once per test unit of not more than 50 tonnes(55 tons) of pipe
6	Tensile testing of the pipe body of welded pipe with D ＞ 48.3 mm(1.900 in.),in Grade L175P or A25P	CW	Once per test unit of not more than 50 tonnes(55 tons)of pipe
7	Tensile testing of the pipe body of seamless pipe	SMLS	Once per test unit of pipe with the same cold-expansion ratio a
8	Tensile testing of the pipe body of welded pipe in grades higher than Grade L175 or A25	LFW,HFW,LW,SAW,or CoW	Once per test unit of pipe with the same cold-expansion ratio a
9	Tensile testing of the longitudinal or helical seam weld of welded pipe with D ≥ 219.1 mm (8.625 in.).	LFW,HFWLW,SAW,or Cow	Once per test unit of pipe with the same cold-expansion ratio a,b,c
10	Tensile testing of the coil/plate end weld of welded pipe with D ≥ 219.1 mm (8.625 in.).	SAWH or COWH	At least once per 50 coil/plate end welds from pipe with the same cold-expansion ratio a,c,d
11	Bend testing of the longitudinal seam weld of welded pipe with D ≤ 48.3 mm(1.900 in.),in Grade L175, L175P, A25,or A25P	CW,LFW,or HFW	Once per test unit of not more than 25 tonnes(28 tons) of pipe
12	Bend testing of the longitudinal seam weld of welded pipe with 48.3 mm(1.900 in.)<D ≤ 60.3 mm (2.375 in.).in Grade L175,L175P,A25,or A25P	CW,LFW,or HFW	Once per test unit of not more than 50 tonnes(55 tons) of pipe
13	Guided-bend testing of the longitudinal or helical seam weld of welded pipe	SAW or COW	Once per test unit of not more than 50 lengths of pipe of the same grade
14	Guided-bend testing of the coil/plate end weld of welded pipe	SAWH or COWH	At least once per 50 col/plate end welds from pipe with the same cold expansion ratio a,c,d
15	Guided-bend testing of the longitudinal seam weld of welded pipe with D ≥ 323.9 mm (12.750 in.)	LW	Once per test unit of not more than 50 lengths of pipe of the same grade
16	Flattening test of welded pipe	CW,LFW,HFW,or LW	As shown in Figure 6
17	Hardness testing of hard spots in cold-formed welded pipe	LFW,HFW,LW,SAW,or COW	Any hard spot exceeding 50 mm (2.0 in.) in any direction
18	수압 테스트	SMLS,CW,LFW,HFW,LWSAW,or COW	Each pipe
19	Macrographic testing of the longitudinal or helical seam weld of welded pipe	SAW or COW	At least once per operating shift plus whenever any change of pipe size occurs during the operating shift; or if 10.2.5.2 applies, at the beginning of the production of each combination of specified outside diameter and specified wall thickness
20	Metallographic testing of the longitudinal seam weld of welded pipe	LFW or HFW excluding full-body normalized pipe	At least once per operating shift plus whenever changes of grade, specified outside diameter or specified wall thickness are made:plus whenever excursions from operating heat treatment conditions are encountered
21	Visual inspection	SMLS,CW,LFW,HFW,LW,SAW,or COW	Each pipe, except as allowed by 10.2.7.2
22	Pipe diameter and out-of-roundness	SMLS,CW,LFW,HFW,LW,SAW,or COW	At least once per 4 h per operating shift plus whenever any change of pipe size occurs during the operating shift
23	Wall thickness measurement	All pipe	Each pipe (see 10.2.8.5)
24	Other dimenslonal testing	SMLS,CW,LFW,HFW,LW,SAW,or COW	Random testing,with the details left tothe discretion of the manufacturer
25	Weighing of pipe with D <141.3 mm (5.563 in.)	SMLS,CW,LFW,HFW,LW,SAW,or COW	Each pipe or each convenient group of pipe, with the choice being at the discretion of the manufacturer
26	Weighing of pipe with D ≥141.3 mm (5.563 in.)	SMLS,CW,LFW,HFW,LW,SAW,or COW	Each pipe
27	길이	SMLS,CW,LFW,HFW,LW,SAW,or COW	Each length of pipe shall be measured, except that pipe made in lengths that are uniform within 30 mm (0.1 ft) need not be individually measured, provided the accuracy of the length is verified at least once per 4 h per operating shift
28	Nondestructive inspection	SMLS,CW,LFW,HFW,LW,SAW,or COW	In accordance with Annex E

a The cold-expansion ratio (if applicable) is designated by the manufacturer and is derived using the designated before-expansion outside diameter or circumference and the after-expansion outside diameter or circumference; an increase or decrease in the cold-expansion ratio of more than 0.002 requires the creation of a new test unit.

b For double-seam pipe, both longitudinal weld seams in the pipe selected to represent the test unit shall be tested.

c Pipe produced by each welding machine shall be tested at least once per week.

d Applies only to finished helical seam pipe containing coil/plate end welds.

e “Test unit””is as defined in 3.1.60.

- Inspection Frequency for API 5L PSL 2

No	Type of Inspection	파이프 유형	Frequency of Inspection e
1	Hea analysis	All pipe	One analysis per heat of steel
2	제품 분석	SMLS , HFW , SAW , orCOW	Two analyses per heat of steel ( taken from separate product items )
3	Tensile testing of the pipe body D ≤141.3 mm (5.563 in .)	SMLS , HFW , SAW , or COW	Once per test unit of not more than 400 pipes with the same cold – expansion ratio a
4	Tensile testing of the pipe body D >141.3mm(5.563in.) and ≤323.9 body mm (12.750 in .)	SMLS , HFW , SAW , or COW	Once per test unit of not more than 200 pipes with the same cold – expansion ratio a
5	Tensile testing of the pipe D >323.9 mm (12.750 in .)	SMLS,HFW , SAW , or COW	Once per test unit of not more than 100 pipes with the same cold – expansion ratio a
6	Tensile testing of the longitudinal or helical seam weld of welded pipe with D ≥219.1 mm (8.625 in .) and ≤323.9 mm (12.750 in .)	HFW , SAW , or COW	Once per test unit of not more than 200 pipes with the same cold – expansion ratio a . b , c
7	Tensile testing of the longitudinal or helical seam weld of welded pipe with D >323.9 mm (12.750 in .)	HFW , SAW , or COW	Once per test unit of not more than 100 pipes with the same cold – expansion ratio a , b . c
8	Tensile testing of the coil / plate end weld of welded pipe with D ≥219.1 mm (8.625 in .)	SAWH or COWH	At least once per 50 coil / plate end welds from pipe with the same cold – expansion ratio a , b , d
9	CVN impact testing of the pipe body of pipe with specified outside diameter and specified wall thickness as given in Table 22	SMLS , HFW , SAW , or COW	Once per test unit of pipe with the same cold – expansion ratio a
10	If agreed , CVN impact testing of the longitudinal seam weld of welded pipe specified wall thickness as given in with specified outside diameter and Table 22	HFW	Once per test unit of pipe with the same cold – expansion ratio a , b
11	CVN impact testing of the longitudinal or helical seam weld of welded pipe specified wall thickness as given in with specified outside diameter and Table 22	SAW or COW	Once per test unit of pipe with the same cold – expansion ratio a . b . c
12	CVN impact testing of the coil / plate end weld of welded pipe with specified outside diameter and specified wall thickness as given in Table 22	SAWH or COWH	At least once per 50 coil / plate end welds from pipe with the same cold – expansion ratio a , b , d
13	If agreed , DWT testing of the pipe body of welded pipe with D ≥508 mm (20.000 in .)	HFW , SAW , or COW	Once per test unit of pipe with the same cold – expansion ratio a
14	Guided – bend testing of the longitudinal or helical seam weld of welded pipe	SAW or COW	Once per test unit of not more than 50 lengths of pipe with the same cold – expansion ratio
15	Guided – bend testing of the coil / plate end weld of welded pipe	SAWH or COWH	At least once per 50 coil / plate end welds from pipe with the same cold – expansion ratio a , b . d
16	Flattening test of welded pipe	HFW	As shown in Figure 6
17	Hardness testing of hard spots in cold -formed welded pipe	HFW , SAW , or COw	Any hard spot exceeding 50 mm (2.0 in .) in any direction
18	수압 테스트	SMLS , HFW , SAW , or COW	Each pipe
19	Macrographic testing of the longitudinal or helical seam weld of welded pipe	SAW or COW	At least once per operating shift plus whenever any change of pipe size occurs during the operating shift ; or , if 10.2.5.3 or 10.2.5.4 applies , at the beginning of the production of each combination of specified outside diameter and specified wall thickness
20	Metallographic testing ( or optional hardness test in lieu of metallography )of the longitudinal seam weld of welded pipe	HFW excluding full – body normal	At least once per operating shift plus whenever changes of grade , specified outside diameter or specified wall thickness are made ; plus whenever excursions from operating heat treatment conditions are encountered
21	Visual inspection	SMLS,HFW,SAW,OR COW	Each pipe , except as allowed by 10.2.7.2
22	Pipe diameter and out – of – roundness	SMLS,HFW,SAW,OR COW	At least once per 4 h per operating shift plus whenever any change of pipe size occurs during the operating shift
23	Wall thickness measurement	All pipe	Each pipe ( see 10.2.8.5)
24	Other dimensional testing	SMLS,HFW,SAW,OR COW	Random testing , with the details left to the discretion of the manufacturer
25	Weighing of pipe withD <141.3 mm (5.563 in .)	SMLS,HFW,SAW,OR COW	Each pipe or each convenient group of pipe , with the choice being at the discretion of the manufacturer
26	Weighing of pipe with D 2141.3 mm (5.563 in .)	SMLS,HFW,SAW,OR COW	Each pipe
27	길이	SMLS,HFW,SAW,OR COW	Each length of pipe shall be measured , except that pipe made in lengths that are uniform within 30 mm (0.1 ft ) need not b individually measured , provided the accuracy of the length is verified at least once per 4 h per operating shift
28	Nondestructive inspection	SMLS,HFW,SAW,OR COW	In accordance with Annex E
a. The cold – expansion ratio ( if applicable ) is designated by the manufacturer and is derived using the designated before – expansion outside diameter or circumference and the after – expansion outside diameter or circumference ; an increase or decrease in the cold – expansion ratio of more than 0.002 requires the creation of a new test unit . b. Pipe produced by each welding machine shall be tested at least once per week . c. For double – seampipe , both longitudinal weld seams in the pipe selected to represent the test unit shall be tested . d. Applies only to finished helical seam pipe containing coil / plate end welds . e. ” Test unit ” is as defined in 3.1.60.

Test and inspection of API 5L

- 수압 테스트

A hydrostatic test is a type of pressure test that is commonly used during the production of line pipes. The test is used to check for leaks in the weld seam or pipe body. To conduct the test, water is pumped into the pipe until it reaches a predetermined pressure. The pipe is then monitored for any leaks. If a leak is detected, the pipe will need to be repaired or replaced. The hydrostatic test is an important quality control measure that helps to ensure the safety and integrity of pipes.

- Bending Test

A bending test is a type of quality control test that is performed during steel pipe production. The purpose of the test is to check for cracks in the welds, as well as to assess the strength of the steel. To perform the test, a sample piece of pipe is bent into a U-shape. The steel is then examined for cracks or other signs of weakness. If any are found, the entire batch of steel pipes will be scrapped and a new batch will be made. However, if the bending test proves successful, the steel pipes will be approved for use.

- 평탄화 테스트

A flattening test is a steel line pipe production test that assesses a steel tube’s resistance to deformation and cracking under stress. It is an important quality control measure that helps ensure the steel used in line pipe products is of the highest possible quality. The test involves applying pressure to a steel tube until it deforms or cracks. The flattening test will reveal the pipe’s resistance to longitudinal and circumferential cracking. The results of the test help determine the steel’s strength and ductility, two important properties for steel used in line pipe applications. Flattening tests are just one of many quality control measures that are used during steel line pipe production, but they play an important role in ensuring the safety and integrity of the final product.

- CVN 영향 테스트

The CVN impact test is a temperature test that is conducted during pipe production in order to ensure the mechanical properties of the pipe. The test is conducted on three different positions on the pipe: the body, the welding seam, and the heat-affected zone. The results of the test are used to determine the Charpy V-notch impact strength of the pipe. The CVN impact test is an important quality control measure for pipe production, and it is required by the American Petroleum Institute (API) in order to meet its standards.

- DWTT

The DWTT test, or drop-weight tear tests, are specified in the API 5L production specification. In this test, a large weight is dropped onto a pre-weakened point on a sample of pipe. The resulting fracture is examined to ensure that it meets the requirements for ductile fracture behavior. This test is important because it helps to ensure that pipes will be able to withstand the stress of being transported and installed without breaking. As a result, the DWTT test is an essential part of the quality control process for large diameter line pipes.

Why choose tuspipe API 5L

TUSPIPE stands tall as an indispensable ally for the oil and gas industry. Our pipes serve as the very lifelines that efficiently channel vital resources. Understanding the criticality of high-performing pipes in this sector, we engineer our products to withstand the rigorous demands and aggressive environments typical of oil and gas applications. Our pipes are compliant with stringent API 5L specifications, ensuring unmatched strength and durability. Our heat treatment and inspection capabilities further fortify welds and eradicate leaks. Moreover, TUSPIPE’s anti-corrosion services, such as FBE, 3LPE, and 3LPP coatings, guarantee long-lasting resilience against corrosion – a non-negotiable necessity for oil and gas pipelines.

How to Select an API 5L Certified Line Pipe Supplier in China?

When selecting an API 5L certified supplier in China, it is important to be aware of the fake certificates that some companies use. These fake certificates are often created using photoshop and can be very difficult to identify. However, they can often trick buyers into thinking they are getting a high-quality product when in reality the product is of low quality and may even be dangerous. This damages the projects that use these pipes because they are not up to code and they can cause safety issues. If something goes wrong, the company that chose the line pipe supplier with a fake certificate can be sued and lose a lot of money in compensation payments. Don’t let this happen to your company! As such, it is always best to select a reputable and trustworthy supplier who can provide you quality pipes with a genuine API 5L certificate. This will help to ensure the safety of your business and avoid any potential legal problems. Next, I’ll show you how to spot fake certificates.

1. API 컴포지트 목록 확인

The Composite List is a directory of all the companies that are certified by the American Petroleum Institute (API). This list can be used to check if a line pipe manufacturer is authorized to use the API logo on its products. To search the Composite List,

1) 다음 페이지로 이동합니다. API 공식 웹사이트 를 클릭하고 “API 복합 목록” 탭을 클릭합니다;

2) 위의 스크린샷이 표시되면 회사 이름 또는 인증 번호를 입력한 후 “검색'을 클릭합니다;

3) 마지막으로 인증 유형 및 인증 상태에 대한 회사 세부 정보를 확인할 수 있습니다.

인증 유형이 찾고 있는 것과 같고 인증서 상태도 “활성”으로 표시되면 이 단계에서는 안전합니다. 회사 세부 정보를 확인하여 올바른 사람과 거래하고 있는지 확인하고 싶을 수도 있는데, 빨간색으로 표시된 회사 이름을 클릭하면 됩니다.

2. 비라이선스 사용자/등록자 목록 확인

또한 미국석유협회(API)는 과거에 API가 적발한 모든 사기 업체 목록을 공개했으며, 이러한 업체는 여전히 시장에 존재하고 있습니다. API 비인가자/등록자 목록은 위조 인증서를 보유한 자격이 없는 공급업체를 찾는 데 유용한 리소스입니다. 목록을 확인하는 방법은 다음과 같습니다:

1) Go to the API official website and find the “Non-Licensee/Registrant List” tab;

2) 아래로 스크롤하여 가짜 라이선스로 사용자를 속일 수 있는 사기꾼 회사를 모두 찾아보세요.

You can use this information to help you narrow down your search for a qualified line pipe supplier. If you are looking for a specific company, you can type the company name in the “Search” box.

3. 공급업체에서 MTC 확인

위 단계에서 특이한 사항이 발견되지 않았다고 해서 해당 공급업체가 적격하다는 의미는 아닙니다. 다음 단계에서 공급업체의 MTC를 확인하는 것이 좋습니다. MTC는 “복제'가 쉽다는 것을 알고 있지만 여전히 약점을 발견할 수 있습니다.

1) 회사명 - 위 사진에서 보시는 것처럼 저희 회사명과 매우 유사하지만 전혀 다른 이름입니다. 실제 인증서에서 “Co.”는 “회사”로 표기되지 않으며 “Ltd”는 “유한회사”로 표기되지 않습니다.

2) The CNAS certification – CNAS is an organization that evaluates whether a lab can be accredited to National Accredited Testing Laboratory in China. It has bilateral or multi-lateral accreditation cooperation agreements with relevant accreditation organizations around the world. So we can check this certificate also to eliminate our doubts. First, go to the CNAS official website; Second, click on “Find an Accredited Body”; Then, choose “Testing & Calibration Laboratories”, and type in the registration number or the company name; Finally, you can check if the registration number and company name are matched to the MTC you have;

3) The API certification number – Usually, a line pipe mill that is holding the API certification would show the certification numbers on the MTC. While there is none of it on the sample MTC above.