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API 5L Seamless&Welded Line Pipe

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Standards scope

ANSI / API 5L specifies the manufacture of two product levels (PSL1 and PSL2) of seamless and welded steel pipe for the use of a pipeline in the transportation of petroleum and natural gas. 

Note:Pipe manufactured to ASTM106 Grade A or B are not interchange with API 5L. Requirements to API 5L X grades are more stringent; rolled grades are not acceptable and rework is not allowed. Moreover, particular attention is given to toughness and toughness tests for sour services and higher pressure & temperature classes.


The Types API 5L Seamless and Welded pipe

Seamless Type: Including hot rolled seamless for pipe diameter above 3 inch, cold rolled seamless below 3 inch.

ERW Welded Type: Electric Resistance Welded, for pipe diameter below 24 inch.

LSAW Type: Longitudinal Sub-merged Arc Welding, for pipe OD 20 inch to 48 inch. LSAW also called JCOE, it means pipe manufacturing shapes from J shape, C shape, O shape, and then cold expanding.

SSAW/HSAW Type:  Spiral Sub-merged Arc Welding or Helical SAW, for pipe OD up to 100 inch


Process

Ingots, blooms, billets, coils or plates used for the manufacture of pipe shall be made via basic oxygen, electric furnace or open hearth in combination with a ladle refining process. for PSL2, the steel shall be killed and melted according to a fine grain practice. Coil or plate used for PSL2 pipe shall not contain any repair welds.


The main advantages of API 5L pipe

(1)Resistance to cracking forces that may propagate in long pipelines

(2)Sour service suitability

(3)Rather inexpensive and long service life (at least grades B, X42)


API 5L PIPE SCHEDULE CHART

NPS
(in)

Outside Diameter
(in)

API 5l Pipe Schedule

SCH 10

SCH 20

SCH 30

SCH STD

SCH 40

SCH 60

SCH XS

SCH 80

SCH 100

SCH 120

SCH 140

SCH 160

SCH XXS

Wall Thickness (in)

1/8

0.405




0.068

0.068


0.095

0.095






1/4

0.540




0.088

0.088


0.119

0.119






3/8

0.675




0.091

0.091


0.126

0.126






1/2

0.840




0.109

0.109


0.147

0.147




0.187

0.294

3/4

1.050




0.113

0.113


0.154

0.154




0.219

0.308

1

1.315




0.133

0.133


0.179

0.179




0.250

0.358

1 1/4

1.660




0.140

0.140


0.191

0.191




0.250

0.382

1 1/2

1.900




0.145

0.145


0.200

0.200




0.281

0.400

2

2.375




0.154

0.154


0.218

0.218




0.344

0.436

2 1/2

2.875




0.203

0.203


0.276

0.276




0.375

0.552

3

3.500




0.216

0.216


0.300

0.300




0.438

0.600

3 1/2

4.000




0.226

0.226


0.318

0.318






4

4.500




0.237

0.237


0.337

0.337


0.438


0.531

0.674

5

5.563




0.258

0.258


0.375

0.375


0.500


0.625

0.750

6

6.625




0.280

0.280


0.432

0.432


0.562


0.719

0.864

8

8.625


0.250

0.277

0.322

0.322

0.406

0.500

0.500

0.594

0.719

0.812

0.906

0.875

10

10.750


0.250

0.307

0.365

0.365

0.500

0.500

0.594

0.719

0.844

1.000

1.125

1.000

12

12.750


0.250

0.330

0.375

0.406

0.562

0.500

0.688

0.844

1.000

1.125

1.312

1.000

14

14.000

0.250

0.312

0.375

0.375

0.438

0.594

0.500

0.750

0.938

1.094

1.250

1.406


16

16.000

0.250

0.312

0.375

0.375

0.500

0.656

0.500

0.844

1.031

1.219

1.438

1.594


18

18.000

0.250

0.312

0.438

0.375

0.562

0.750

0.500

0.938

1.156

1.375

1.562

1.781


20

20.000

0.250

0.375

0.500

0.375

0.594

0.812

0.500

1.031

1.281

1.500

1.750

1.969


22

22.000

0.250

0.375

0.500

0.375


0.875

0.500

1.125

1.375

1.625

1.875

2.125


24

24.000

0.250

0.375

0.562

0.375

0.688

0.969

0.500

1.219

1.531

1.812

2.062

2.344


30

30.000

0.312

0.500

0.625

0.375



0.500







32

32.000

0.312

0.500

0.625

0.375

0.688









34

34.000

0.312

0.500

0.625

0.375

0.688









36

36.000

0.312

0.500

0.625

0.375

0.750









42

42.000


0.500

0.625

0.375

0.750










API 5l Pipe Coating Standard:

(1)ANSI/AWWA C104/A21.4 American National Standard for Cement-Mortar Lining for Ductile-Iron Pipe and Fittings for Water

(2)ISO 21809 Petroleum and natural gas industries — External coatings for buried or submerged pipelines used in pipeline transportation systems

(3)DIN 30670 Polyethylen coatings of steel pipes and fittings

Difference between API 5L PSL-1 and PSL-2 pipe( Main differ in chemical composition and test requirements)

API 5l Pipe Coating Type

API 5l Pipe Coating Layer

API 5l Pipe Coating thickness

Three layers polyethylene

Inside layer: epoxy (Green)

2.0 -4.5mm

Mid layer: adhensive (White)

Outsidelayer:polyethylene (Black)

Two layers polyethylene

Inside layer: adhensive

2.0 -4.5mm

Outside layer: polythene

Epoxy

Epoxy

200-400um

Two layers epoxy

Inside layer: expoxy (Green)

400-800um

Outside layer:intensity epoxy (sage green)

Three layers polyethylene

Inside layer: expoxy (Green)

2.5 -3mm



Difference between API 5L PSL-1 and PSL-2 pipe( Main differ in chemical composition and test requirements)

PSL

Delivery Condition

Pipe grade

PSL1

As-rolled, normalized, normalizing formed

A


As-rolled, normalizing rolled, thermomechanical rolled, thermo-mechanical formed, normalizing formed, normalized, normalized and tempered or if agreed Q&T SMLS only

B


As-rolled, normalizing rolled, thermomechanical rolled, thermo-mechanical formed, normalizing formed, normalized, normalized and tempered

X42, X46, X52, X56, X60, X65, X70

PSL 2

As-rolled

BR, X42R


Normalizing rolled, normalizing formed, normalized or normalized and tempered

BN, X42N, X46N, X52N, X56N, X60N


Quenched and tempered

BQ, X42Q, X46Q, X56Q, X60Q, X65Q, X70Q, X80Q, X90Q, X100Q


Thermomechanical rolled or thermomechanical formed

BM, X42M, X46M, X56M, X60M, X65M, X70M, X80M


Thermomechanical rolled

X90M, X100M, X120M


The suffice (R, N, Q or M) for PSL2 grades, belongs to the steel grade



Steel Grade&Chemical Composition for PSL 1 pipe 

Steel Grade

Mass fraction, % based on heat and product analyses a,g

C

Mn

P

S

V

Nb

Ti

max b

max b

max

max

max

max

max

Seamless Pipe

A

0.22

0.9

0.3

0.3

B

0.28

1.2

0.3

0.3

c,d

c,d

d

X42

0.28

1.3

0.3

0.3

d

d

d

X46

0.28

1.4

0.3

0.3

d

d

d

X52

0.28

1.4

0.3

0.3

d

d

d

X56

0.28

1.4

0.3

0.3

d

d

d

X60

0.28 e

1.40 e

0.3

0.3

f

f

f

X65

0.28 e

1.40 e

0.3

0.3

f

f

f

X70

0.28 e

1.40 e

0.3

0.3

f

f

f

Welded Pipe

A

0.22

0.9

0.3

0.3

B

0.26

1.2

0.3

0.3

c,d

c,d

d

X42

0.26

1.3

0.3

0.3

d

d

d

X46

0.26

1.4

0.3

0.3

d

d

d

X52

0.26

1.4

0.3

0.3

d

d

d

X56

0.26

1.4

0.3

0.3

d

d

d

X60

0.26 e

1.40 e

0.3

0.3

f

f

f

X65

0.26 e

1.45 e

0.3

0.3

f

f

f

X70

0.26e

1.65 e

0.3

0.3

f

f

f

a. Cu ≤ = 0.50% Ni; ≤ 0.50%; Cr ≤ 0.50%; and Mo ≤ 0.15%,
b. For each reduction of 0.01% below the specified max. concentration for carbon, and increase of 0.05% above the specified max. concentration for Mn is permissible, up to a max. of 1.65% for grades ≥ B, but ≤ = X52; up to a max. of 1.75% for grades > X52, but < X70; and up to a maximum of 2.00% for X70.,
c. Unless otherwise agreed NB + V ≤ 0.06%,
d. Nb + V + TI ≤ 0.15%,
e. Unless otherwise agreed.,
f. Unless otherwise agreed, NB + V = Ti ≤ 0.15%,
g. No deliberate addition of B is permitted and the residual B ≤ 0.001%


Steel Grade&Chemical Composition for PSL 2 pipe 

Steel Grade

Mass fraction, % based on heat and product analyses

Carbon Equiv a

C

Si

Mn

P

S

V

Nb

Ti

Other

CE IIW

CE Pcm

max b

max

max b

max

max

max

max

max

max

max

Seamless and Welded 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

Welded Pipe

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 max. concentration for carbon, and increase of 0.05% above the specified max. concentration for Mn is permissible, up to a max. of 1.65% for grades ≥ B, but ≤ = X52; up to a max. of 1.75% for grades > X52, but < X70; and up to a maximum of 2.00% for X70.,
c. Unless otherwise agreed Nb = V ≤ 0.06%,
d. Nb = V = Ti ≤ 0.15%,
e. Unless otherwise agreed, Cu ≤ 0.50%; Ni ≤ 0.30% Cr ≤ 0.30% and Mo ≤ 0.15%,
f. Unless otherwise agreed,
g. Unless otherwise agreed, Nb + V + Ti ≤ 0.15%,
h. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 0.50% Cr ≤ 0.50% and MO ≤ 0.50%,
i. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.50% and 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. For all PSL 2 pipe grades except those grades with footnotes j noted, the following applies. Unless otherwise agreed no intentional addition of B is permitted and residual B ≤ 0.001% .



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