What is the pressure rating for Grade B pipe

What is the pressure rating for API 5L Grade B pipe?

API 5L Grade B pipe is a common pipe for oil and gas pipeline transmission. This is also known as L245 pipe (see ISO 3183). Named for its minimum yield strength of 245 MPa (35,500 psi).

‌API 5L Gr.B seamless steel pipes‌ are manufactured from ‌high-quality carbon steel or low-alloy steel billets‌ through hot-rolling or cold-drawing processes. Key specifications include:

‌Chemical Composition‌:

Carbon (C) ≤0.28%

Manganese (Mn) ≤1.20%

‌Mechanical Properties‌:

Yield strength ≥241 MPa

Tensile strength: 413-517 MPa

‌Welding Control‌:

Carbon equivalent (Ceq) typically ≤0.43% ensures weldability

API 5L Grade B Pipe Schedule Chart

NB	DN	OD (mm)	Pipe Schedule
NB	DN	OD (mm)	SCH 5	SCH 10	SCH 20	SCH 30	SCH 40	SCH 60	SCH 80	SCH 100	SCH 120	SCH 160
3/4"	20	26.67	1.65	2.11	x	2.41	2.87	x	3.91	x	4.32	5.56
1"	25	33.40	1.65	2.77	x	2.90	3.38	x	4.55	x	5.08	6.35
1.1/2"	40	48.26	1.65	2.77	x	3.18	3.68	x	5.08	x	5.72	7.14
2"	50	60.32	1.65	2.77	x	x	3.91	x	5.54	x	6.35	8.74
2.1/2"	65	73.02	2.11	3.05	x	x	5.16	x	7.01	x	7.62	9.53
3"	80	88.9	2.11	3.05	x	x	5.49	x	7.62	x	8.89	11.13
4"	100	114.3	2.11	3.05	x	x	6.02	x	8.56	x	11.10	13.49
5"	125	141.3	5.77	3.4	x	x	6.55	x	9.53	x	12.70	15.88
6"	150	168.27	2.77	3.4	x	x	7.11	x	10.97	x	14.27	18.26
8"	200	219.07	2.77	3.76	6.35	7.04	8.18	12.7	12.70	15.06	18.24	23.01
10"	250	273.05	3.4	4.19	6.35	7.8	9.27	12.7	15.06	18.24	21.41	28.58
12"	300	323.85	4.19	4.57	6.35	8.38	10.31	12.7	17.45	21.41	25.40	33.32

test and inspection

Dimensional deviations

surface quality

chemical composition analysis

mechanical property testing

non-destructive testing

inspection

API 5L GRB Gas and oil line pipe factory

API 5L GRB Pipeline Factory

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