ASTM A135

ASTM A135

This specification applies to two classes of electric-resistance-welded steel pipe used to transport gas, vapor, water, or other liquids. The steel must be produced using either the basic oxygen or electric-furnace procedures. Steel can be cast as ingots or as strands. The pipe should be made from flat-rolled steel in individual or continuous lengths by electric resistance or electric-induction welding, with no extraneous material added. After welding, the weld seam of electric-resistance welded pipe to Grade B pipe should be heat treated or processed in such a way that no untempered martensite remains. The steel’s tensile and chemical properties are specified. Steel pipe specimens are subjected to flattening and hydrostatic tests. As an alternative to the hydrostatic test, a nondestructive electric test, either electromagnetic (eddy current) or ultrasonic, may be selected.

PRODUCT FEATURES

Scope of ASTM A135 Standard

This specification covers two grades of electric-resistance-welded steel pipe in nominal sizes NPS 2 to NPS 30 [DN 50 to DN 750] inclusive, with nominal (average) wall thickness up to 0.500 in. [12.70 mm], and in nominal sizes NPS 3/4 to NPS 5 [DN 20 to DN 125] inclusive, with a nominal (average) wall thickness of 0.083 in. [2.11 mm] to 0.134 in. [3.40 mm]. A pipe of different dimensions may be supplied as long as it meets all of the other criteria of this standard. The pipe is designed to transport gas, vapor, water, or other liquids; only Grade A is suitable for flanging and bending. Because the usefulness of a pipe for diverse applications is influenced by its dimensions, qualities, and service circumstances, the purpose for which the pipe is intended should be specified in the order. At the manufacturer’s discretion, the pipe can be supplied non-expanded or cold expanded. When a pipe is cold expanded, the amount of expansion must not exceed 1.5 percent of the pipe’s outer diameter.

Appearance and End Preparation of ASTM A135 Pipes

ASTM A135 ERW steel pipes must be fairly straight and defect-free. Surface flaws of more than 12.5 percent of the nominal wall thickness must be avoided. The pipes might have a plain end, a beveled end, or a threaded end. ERW pipes supplied to SCH 10, in particular, must have a plain end only. All cutting burrs, both inside and outside, must be removed. Each length of threaded pipe must have one coupling for connecting purposes.

Steel Grades of ASTM A135 Sprinkler Pipes

Dimensions and Sizes of ASTM A135 Sprinkler Pipes

N.D.

O.D.

SCH 10

SCH 30/40

WALL THICKNESS

NOMINAL WEIGHT

WALL THICKNESS

NOMINAL WEIGHT

(mm)

(inch)

(mm)

(inch)

(mm)

(inch)

(kg/mtrs)

(lbs/ft)

(mm)

(inch)

(kg/mtrs)

(lbs/ft)

15

1/2

21.30

0.84

—-

—-

—-

—-

2.77

0.109

1.27

0.85

20

3/4

26.70

1.05

2.11

0.083

1.28

0.96

2.87

0.113

1.69

1.13

25

1

33.40

1.32

2.77

0.109

2.09

1.41

3.38

0.133

2.50

1.68

32

1-1/4

42.20

1.66

2.77

0.109

2.69

1.81

3.56

0.14

3.39

2.27

40

1-1/2

48.30

1.90

2.77

0.109

3.11

2.09

3.68

0.145

4.05

2.72

50

2

60.30

2.38

2.77

0.109

3.93

2.64

3.91

0.154

5.45

3.66

65

2-1/2

73.00

2.88

3.05

0.12

5.26

3.53

5.16

0.203

8.64

5.80

80

3

88.90

3.50

3.05

0.12

6.46

4.34

5.49

0.216

11.29

7.58

90

3-1/2

101.60

4.00

3.05

0.12

7.41

4.98

5.74

0.226

13.58

9.12

100

4

114.30

4.50

3.05

0.12

8.37

5.62

6.02

0.237

16.09

10.80

125

5

141.30

5.56

3.4

0.134

11.58

7.78

6.55

0.258

21.79

14.63

150

6

168.30

6.63

3.4

0.134

13.85

9.30

7.11

0.28

28.29

18.99

200

8

219.10

8.63

4.78

0.188

25.26

16.96

7.04

0.277

36.82

24.72

250

10

273.10

10.75

4.78

0.188

31.62

21.23

7.08

0.307

51.05

34.27

Chemical Composition of ASTM A135 Pipe

Steel Grades

Carbon max

Manganese

Phosphorous

Sulfur

Gr. A

0.25

0.95

0.035

0.035

Gr. B

0.30

1.20

0.035

0.035

Mechanical Properties of ASTM A135 Pipes

ASTM A135

Grade A

Grade B

Tensile Strength,
min, ksi [MPa]

48
[330]

60
[415]

Yield Strength,
min, ksi [MPa]

30
[205]

35
[240]

Elongation,
min, %

35

30

Test & Inspection During ASTM A135 Sprinkler Pipe Production

The following tests will be performed during ASTM A135 sprinkler pipe production:

  • Chemical Analysis – 2 pieces/lot of 500 or 2 pieces/heat, according to the chemical analysis. The failure of either pipe necessitates testing of an additional two pieces from the same batch.)
  • Tensile Test – This test is used to determine the mechanical characteristics of the pipe and is done on the pipe. Whenever welding is used to construct a pipe, the weld strength must not be less than the pipe body strength.
  • Bending Test – A bending test is done on pipe dimensions NPS 2 and smaller in order to measure the ductility of the pipe. Depending on the scenario, the bend test might be performed at 90 degrees or 180 degrees.
  • Flattening Test – Pipe diameters larger than NPS 2 are flattening tested to determine ductility. As specified by ASTM A53, a pipe sample is cut and flattened between two flat surfaces using a diamond blade.
  • This is a test that is carried out on each length of the pipe to detect whether or not there is a leak in the system. It is necessary to sustain the pressure for at least 5 seconds.
    • Weld Seam Ultrasonic or Electromagnetic Test– This non-destructive test is done throughout the whole length of the weld to ensure that the weld is structurally sound and free of defects.
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