ASTM Specification for SS Tubing & Piping

Specification

Allowable Outside Diameter Variations in mm

Allowable Wall thickness Variations

Exact Length Tolerances in mm

Testing

ASTMA – 312 Seamless & Welded Pipe

3.175 – 38.1 incl.

0.4

0.79

Minimum Wall 

6.4

0

Tension Test

38.1 – 101.6 incl.

0.79

0.79

12.5% under 

6.4

0

Flattering Test

101.6 – 203.2 incl.

1.59

0.79

nominal wall specified

6.4

0

100% Hydrostatic Test 
Refer to ASTMA-530

ASTMA – 213 Seamless Boiler Superheater and Heat Exchanger Tubes

Nominal Diameter

Over

Under

%Over

%Under

Over

Under 

 

Under 25.4

0.1016

0.1016

20

0

3.175

0

Tension Test

25.4 – 38.1 incl.

0.1524

0.1524

20

0

3.175

0

Flattering Test

38.1 – 5.8 excl.

0.2032

0.2032

22

0

3.176

0

Flare Test

50.8 – 63.5 excl.

0.254

0.254

22

0

4.76

0

Hardness Test

63.5 – 76.2 excl.

0.3048

0.3048

22

0

4.76

0

100% Hydrostatic Test

76.2 – 101.6 incl. 

0.381

0.381

22

0

4.76

0

Refer to ASTMA – 50

 

ASTMA A – 249 Welder Boiler Superheater Heat Exchanger and Condenser Tubes

Under 25.4

0.1016

0.1016

10

-10

3.175

0

Tension Test

25.4 – 38.1 incl.

0.1524

0.1524

10

-10

3.175

0

Flattering Test

38.1 – 50.8 excl.

0.2032

0.2032

10

-10

3.175

0

Flare Test

50.8 – 63.5 excl.

0.254

0.254

10

-10

4.76

0

* Reserve Bend Test

63.5 – 76.2 excl.

0.3048

0.3048

10

-10

4.76

0

Hardness Test

76.2 – 101.6 excl.

0.381

0.381

10

-10

4.76

0

100% Hydrostatic Test

 

Reverse Flattering Test Refer to ASTMA A-450 wherever applicable

ASTMA – 269Seamless & WeldedTubing for GeneralService

UPTO 12.7

0.13

0.13

15

-15

3.2

0

Flare Test

12.7 – 38.1 excl.

0.13

0.13

10

-10

3.2

0

Flange Test (Welded Only)

38.1 – 88.9 excl.

0.25

0.25

10

-10

4.8

0

Harness Test

88.1 – 139.7 excl.

0.38

0.38

10

-10

4.8

0

Reverse Flattering Test 

139.7 – 203.2 excl.

0.76

0.76

10

-10

4.8

0

(Welded Only)

        

100% Hydrastatic Test Refer to ASTMA – 269

 

 

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