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Welding And Casting Comments
Aug 17, 2018


ANSI B16.25

Nominal Pipe Size

3~

4~

5~

6~

8~

10~

12~

14~

16~

A-inches

3.59

4.62

5.69

6.78

8.78

10.94

12.97

14.25

16.25

Nominal Pipe Size

18~

20~

24~

26~

28~

30~

32~

34~

36~

A-inches

18.28

20.31

24.38

26.38

28.38

30.38

32.50

34.50

36.50

Class 150 and 300 valves 12-inch and smaller are regularly machined as shown in two upper illustrations. Unless other wise specified, ends are bored to match schedule 40 pipe in valves 10-inch and smaller and standard wall pipe(0.37~thick) in 12-inch valves.

Orders for Class 150 and 300 butt-welding valves 14-inch and larger. And for Class 400 and higher valves in all sizes, Must specify the inside diameter of the pipe with which the valves will be used, and the type of backing ring required. Other types of weld end preparation can be furnished when specified.

Note:

A=Outside Diameter(Cast Steel Valves) B=Nominal Inside Diameter of pipe

C=B+0.25t-0.041~ t=Nominal Pipe Wall Thickness

C=B+0.25t-0.041~ 0.09=3/32~0.75=3/4~ 0.12=1/8~0.88=7/8

0.03=1/32~0.16=5/32~0.06=1/16~0.38=3/8

 ANSI CLASS 150/300Lb

Note:

1.NPS 24~and smaller by ANSI B16.5,NPS 26 and larger by MSS SP-44.

2.Class 150 and Class 300 flange lowest thickness included 0.06 inch convexity.


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