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Schedule 10S Pipe Pressure Rating Explained

Date:2026-04-13View:18Tags:schedule 10s pipe, stainless steel pipe, pipe pressure rating
Stainless steel is widely used in modern chemical, food processing, and water treatment systems due to its excellent corrosion resistance. Schedule 10S is a thin-walled steel pipe, and its pressure rating is one of the most important factors when selecting it. This article will provide a comprehensive analysis of the rated pressure of Schedule 10S pipes to help you understand Schedule 10S.


Schedule 10S steel pipe


What is Schedule 10S Pipe?

Schedule 10S is a standardized pipe wall thickness series clearly defined by ASME B36.19 (Stainless Steel Pipe Standard). The "S" stands for Stainless, and Schedule 10S is a thin-walled pipe. Its design significantly reduces the amount of stainless steel used while providing excellent corrosion resistance.

Key Factors Determining the Rated Pressure of Schedule 10S

Schedule 10S is primarily determined by the following four factors:

1. Material Grade
Schedule 10S uses the most common austenitic stainless steels, such as ASTM A312 TP304/304L and TP316/316L. 316L, containing molybdenum, exhibits stronger corrosion resistance than 304L, and their allowable stress at specific high temperatures also differs slightly.

2. Wall Thickness and Outer Diameter
According to Barlow's formula, under the same material conditions, the thinner the pipe wall and the larger the outer diameter, the lower the maximum internal working pressure it can withstand. Schedule 10S, as a thin-walled pipe, has a lower pressure-bearing capacity.

3. Operating Temperature
The physical properties of stainless steel at high and ultra-low temperatures are particularly crucial. At room temperature (100°F / 38°C), Sch 10S pipes achieve maximum pressure resistance; however, when the temperature rises to 400°F (204°C) and above, the tensile strength of the metal decreases, and the rated pressure of the pipe must be derated accordingly.

4. Pipe Manufacturing Process (Seamless vs. Welded)

Seamless pipes generally have a higher pressure resistance than welded pipes. For welded SCH 10S pipes, a weld coefficient must be included in the calculations.


Schedule 10S Pipe Pressure Rating Reference Table (PSI)


SS 304 SCH 10s pipe pressure rating

Temperature (°C):

50

100

150

200

250

300

325

350

375

400

425

450

475

500

525

550

575

600

625

650

675

700

725

Design Strength (MPa):

138

138

138

130

122

115

113

111

110

107

105

103

101

100

97

90

78

64

51

41

33

27

21

Size

Sch No

WT (mm)

Allowable Working Pressure (MPa)

DN

NPS

mm

10

⅜

17.15

10S

1.65

25.4

25.4

25.4

23.9

22.4

21.1

20.8

20.4

20.2

19.7

19.3

18.9

18.6

18.4

17.8

16.5

14.3

11.8

9.4

7.5

6.1

5

3.9

15

½

21.34

10S

2.11

26.1

26.1

26.1

24.6

23.1

21.8

21.4

21

20.8

20.3

19.9

19.5

19.1

18.9

18.4

17

14.8

12.1

9.7

7.8

6.3

5.1

4

20

¾

26.67

10S

2.11

20.5

20.5

20.5

19.3

18.1

17.1

16.8

16.5

16.4

15.9

15.6

15.3

15

14.9

14.4

13.4

11.6

9.5

7.6

6.1

4.9

4

3.1

25

1

33.4

10S

2.77

21.6

21.6

21.6

20.3

19.1

18

17.7

17.4

17.2

16.7

16.4

16.1

15.8

15.6

15.2

14.1

12.2

10

8

6.4

5.2

4.2

3.3

32

1¼

42.16

10S

2.77

16.8

16.8

16.8

15.9

14.9

14

13.8

13.5

13.4

13.1

12.8

12.6

12.3

12.2

11.8

11

9.5

7.8

6.2

5

4

3.3

2.6

40

1½

48.26

10S

2.77

14.6

14.6

14.6

13.7

12.9

12.2

12

11.7

11.6

11.3

11.1

10.9

10.7

10.6

10.3

9.5

8.2

6.8

5.4

4.3

3.5

2.9

2.2

50

2

60.33

10S

2.77

11.6

11.6

11.6

10.9

10.2

9.6

9.5

9.3

9.2

9

8.8

8.6

8.5

8.4

8.1

7.5

6.5

5.4

4.3

3.4

2.8

2.3

1.8

65

2½

73.03

10S

3.05

10.5

10.5

10.5

9.9

9.3

8.7

8.6

8.4

8.3

8.1

8

7.8

7.7

7.6

7.4

6.8

5.9

4.9

3.9

3.1

2.5

2

1.6

80

3

88.9

10S

3.05

8.5

8.5

8.5

8

7.6

7.1

7

6.9

6.8

6.6

6.5

6.4

6.3

6.2

6

5.6

4.8

4

3.2

2.5

2

1.7

1.3

90

3½

101.6

10S

3.05

7.4

7.4

7.4

7

6.6

6.2

6.1

6

5.9

5.8

5.7

5.6

5.4

5.4

5.2

4.9

4.2

3.5

2.8

2.2

1.8

1.5

1.1

100

4

114.3

10S

3.05

6.6

6.6

6.6

6.2

5.8

5.5

5.4

5.3

5.3

5.1

5

4.9

4.8

4.8

4.6

4.3

3.7

3.1

2.4

2

1.6

1.3

1

125

5

141.3

10S

3.4

5.9

5.9

5.9

5.6

5.2

4.9

4.9

4.8

4.7

4.6

4.5

4.4

4.3

4.3

4.2

3.9

3.4

2.8

2.2

1.8

1.4

1.2

0.9

150

6

168.28

10S

3.4

5

5

5

4.7

4.4

4.1

4.1

4

4

3.9

3.8

3.7

3.6

3.6

3.5

3.2

2.8

2.3

1.8

1.5

1.2

1

0.8

200

8

219.08

10S

3.76

4.2

4.2

4.2

4

3.7

3.5

3.4

3.4

3.4

3.3

3.2

3.1

3.1

3

3

2.7

2.4

2

1.6

1.3

1

0.8

0.6

250

10

273.05

10S

4.19

3.8

3.8

3.8

3.5

3.3

3.1

3.1

3

3

2.9

2.9

2.8

2.7

2.7

2.6

2.4

2.1

1.7

1.4

1.1

0.9

0.7

0.6

300

12

323.85

10S

4.57

3.5

3.5

3.5

3.3

3.1

2.9

2.8

2.8

2.8

2.7

2.6

2.6

2.5

2.5

2.4

2.3

2

1.6

1.3

1

0.8

0.7

0.5

350

14

355.6

10S

4.78

3.3

3.3

3.3

3.1

2.9

2.7

2.7

2.6

2.6

2.5

2.5

2.5

2.4

2.4

2.3

2.1

1.9

1.5

1.2

1

0.8

0.6

0.5

400

16

406.4

10S

4.78

2.9

2.9

2.9

2.7

2.5

2.4

2.4

2.3

2.3

2.2

2.2

2.1

2.1

2.1

2

1.9

1.6

1.3

1.1

0.9

0.7

0.6

0.4

450

18

457.2

10S

4.78

2.5

2.5

2.5

2.4

2.3

2.1

2.1

2

2

2

1.9

1.9

1.9

1.8

1.8

1.7

1.4

1.2

0.9

0.8

0.6

0.5

0.4

500

20

508

10S

5.54

2.7

2.7

2.7

2.5

2.4

2.2

2.2

2.1

2.1

2.1

2

2

1.9

1.9

1.9

1.7

1.5

1.2

1

0.8

0.6

0.5

0.4

550

22

558.8

10S

5.54

2.4

2.4

2.4

2.3

2.1

2

2

1.9

1.9

1.9

1.8

1.8

1.8

1.8

1.7

1.6

1.4

1.1

0.9

0.7

0.6

0.5

0.4

600

24

609.6

10S

6.35

2.5

2.5

2.5

2.4

2.2

2.1

2.1

2

2

2

1.9

1.9

1.9

1.8

1.8

1.7

1.4

1.2

0.9

0.8

0.6

0.5

0.4



SS 316 SCH 10s pipe

Temperature (°C):

50

100

150

200

250

300

325

350

375

400

425

450

475

500

525

550

575

600

625

650

675

700

Design Strength (MPa):

138

138

138

133

125

119

117

114

112

111

110

108

107

106

106

103

95

81

65

50

39

30

Size

Sch No

WT
(mm)

Allowable Working Pressure (MPa)

DN

NPS

mm

10

⅜

17.15

10S

1.65

25.4

25.4

25.4

24.5

23

21.9

21.5

21

20.6

20.4

20.2

19.9

19.7

19.5

19.5

18.9

17.5

14.9

11.9

9.2

7.2

5.5

15

½

21.34

10S

2.11

26.1

26.1

26.1

25.2

23.7

22.5

22.2

21.6

21.2

21

20.8

20.5

20.3

20.1

20.1

19.5

18

15.3

12.3

9.5

7.4

5.7

20

¾

26.67

10S

2.11

20.5

20.5

20.5

19.8

18.6

17.7

17.4

17

16.7

16.5

16.4

16.1

15.9

15.8

15.8

15.3

14.1

12

9.7

7.4

5.8

4.5

25

1

33.4

10S

2.77

21.6

21.6

21.6

20.8

19.6

18.6

18.3

17.8

17.5

17.4

17.2

16.9

16.7

16.6

16.6

16.1

14.9

12.7

10.2

7.8

6.1

4.7

32

1¼

42.16

10S

2.77

16.8

16.8

16.8

16.2

15.2

14.5

14.3

13.9

13.7

13.5

13.4

13.2

13.1

12.9

12.9

12.6

11.6

9.9

7.9

6.1

4.8

3.7

40

1½

48.26

10S

2.77

14.6

14.6

14.6

14.1

13.2

12.6

12.4

12.1

11.8

11.7

11.6

11.4

11.3

11.2

11.2

10.9

10

8.6

6.9

5.3

4.1

3.2

50

2

60.33

10S

2.77

11.6

11.6

11.6

11.1

10.5

10

9.8

9.5

9.4

9.3

9.2

9

9

8.9

8.9

8.6

8

6.8

5.4

4.2

3.3

2.5

65

2½

73.03

10S

3.05

10.5

10.5

10.5

10.1

9.5

9

8.9

8.6

8.5

8.4

8.3

8.2

8.1

8

8

7.8

7.2

6.1

4.9

3.8

3

2.3

80

3

88.9

10S

3.05

8.5

8.5

8.5

8.2

7.7

7.4

7.2

7.1

6.9

6.9

6.8

6.7

6.6

6.6

6.6

6.4

5.9

5

4

3.1

2.4

1.9

90

3½

101.6

10S

3.05

7.4

7.4

7.4

7.2

6.7

6.4

6.3

6.2

6

6

5.9

5.8

5.8

5.7

5.7

5.6

5.1

4.4

3.5

2.7

2.1

1.6

100

4

114.3

10S

3.05

6.6

6.6

6.6

6.4

6

5.7

5.6

5.5

5.4

5.3

5.3

5.2

5.1

5.1

5.1

4.9

4.5

3.9

3.1

2.4

1.9

1.4

125

5

141.3

10S

3.4

5.9

5.9

5.9

5.7

5.4

5.1

5

4.9

4.8

4.8

4.7

4.6

4.6

4.6

4.6

4.4

4.1

3.5

2.8

2.2

1.7

1.3

150

6

168.28

10S

3.4

5

5

5

4.8

4.5

4.3

4.2

4.1

4

4

4

3.9

3.9

3.8

3.8

3.7

3.4

2.9

2.3

1.8

1.4

1.1

200

8

219.08

10S

3.76

4.2

4.2

4.2

4.1

3.8

3.6

3.6

3.5

3.4

3.4

3.4

3.3

3.3

3.2

3.2

3.1

2.9

2.5

2

1.5

1.2

0.9

250

10

273.05

10S

4.19

3.8

3.8

3.8

3.6

3.4

3.2

3.2

3.1

3

3

3

2.9

2.9

2.9

2.9

2.8

2.6

2.2

1.8

1.4

1.1

0.8

300

12

323.85

10S

4.57

3.5

3.5

3.5

3.3

3.1

3

2.9

2.9

2.8

2.8

2.8

2.7

2.7

2.7

2.7

2.6

2.4

2

1.6

1.3

1

0.8

350

14

355.6

10S

4.78

3.3

3.3

3.3

3.2

3

2.8

2.8

2.7

2.7

2.6

2.6

2.6

2.5

2.5

2.5

2.5

2.3

1.9

1.5

1.2

0.9

0.7

400

16

406.4

10S

4.78

2.9

2.9

2.9

2.8

2.6

2.5

2.4

2.4

2.3

2.3

2.3

2.2

2.2

2.2

2.2

2.1

2

1.7

1.4

1

0.8

0.6

450

18

457.2

10S

4.78

2.5

2.5

2.5

2.5

2.3

2.2

2.2

2.1

2.1

2

2

2

2

2

2

1.9

1.8

1.5

1.2

0.9

0.7

0.6

500

20

508

10S

5.54

2.7

2.7

2.7

2.6

2.4

2.3

2.3

2.2

2.2

2.1

2.1

2.1

2.1

2

2

2

1.8

1.6

1.3

1

0.8

0.6

550

22

558.8

10S

5.54

2.4

2.4

2.4

2.3

2.2

2.1

2

2

2

1.9

1.9

1.9

1.9

1.9

1.9

1.8

1.7

1.4

1.1

0.9

0.7

0.5

600

24

609.6

10S

6.35

2.5

2.5

2.5

2.4

2.3

2.2

2.2

2.1

2.1

2

2

2

2

2

2

1.9

1.7

1.5

1.2

0.9

0.7

0.6



Frequently Asked Questions (FAQ) about Schedule 10S Pressure

Q: Can Schedule 10S pipes be threaded?

A: No. Sch 10S is designed as a thin-walled pipe. Threading its ends removes too much metal, leaving insufficient wall thickness to withstand the minimum system pressure, making it highly susceptible to breakage and leakage at the joints. Butt welds or flange connections must be used.

Q: What is the difference between Sch 10S and Sch 10?

A: Sch 10 (without the "S") primarily follows ASME B36.10 standards and usually refers to carbon steel pipes. Sch 10S, with the "S," strictly follows ASME B36.19 standards and specifically refers to stainless steel pipes. Although some dimensions may have the same wall thickness, the physical properties of the materials determine their pressure resistance and application scenarios are completely different.

Q: Which welding process is best for welding Sch 10S pipes?

A: Due to the thinner wall thickness, TIG (Tungsten Inert Gas Welding/GTAW) is generally recommended. It provides precise heat input control, effectively prevents burn-through, and ensures the smoothness and corrosion resistance of the stainless steel weld.


Read more: What pressure is schedule 40 pipe

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