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Pipe Spools

Pipe Spool Dimensions
NPS 4 ASME B16.5/B16.9

OTHER DIMENSIONS
1/2
3/4
1
2
3
4
6
8
10
12
14
16
18
20
24

Flange Class 150

77.0   152.0  
spool NPS 4 150
232.0


Flange Class 300

86.0   152.0  
spool NPS 4 300
241.0


Flange Class 600

108.0   152.0  
spool NPS 4 600
263.0

RELATED ARTICLE

What are Welding Procedures?

Flange Class 900

120.0   152.0  
spool NPS 4 900
275.0


Flange Class 1500

130.0   152.0  
spool NPS 4 1500
285.0


Flange Class 2500

196.0   152.0  
spool NPS 4 2500
351.0


Wn flanges and Elbow LR 90 deg.

Notes..
  • Each image shows two Weld Neck flanges and a 90⁃degree Long Radius Elbow.

  • Dimensions are in millimeters unless otherwise indicated.

  • The standard gap (opening) between the ends of butt welds is typically 1.5 mm to 3.0 mm, depending on the wall thickness of the material and the welding procedure specification (WPS).

  • The dimensions calculated on this page are based on a 3 mm gap.

  • Dimensions are given in millimeters and are rounded up or down; for example, 168.3 mm is rounded to 168.0, 88.9 to 89.0, and so on.

  • Detailed dimensions can be found under “Flange and Fitting Dimensions.”

  • TYP stands for “Typical” and indicates that a dimension applies to all identical, recurring locations in the drawing.


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