Dimensions of Class 600 raised face flat welding flange with neck

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Dimensions of Class 600 raised face flat welding flange with neck ~ GB/T9124.2-2019

Dimensions of Class 600 raised face flat welding flange with neck ~ GB/T9124.2-2019

Dimensions of Class 600 Raised Face Flat Welding Flange with Neck per GB/T9124.2-2019

Introduction

The GB/T9124.2-2019 standard, titled “Steel Pipe Flanges – Part 2: Flanges with Raised Face”, provides the detailed dimensional specifications for various classes of steel pipe flanges, including the Class 600 raised face flat welding flange with neck. This article will focus on outlining the key dimensions of this specific flange type as per the requirements outlined in the standard.

Dimensional Specifications

The Class 600 raised face flat welding flange with neck, as per GB/T9124.2-2019, is characterized by the following critical dimensions:

  1. Nominal Pipe Size (NPS): The standard specifies the NPS ranging from 1/2 inch (DN15) to 24 inches (DN600).

  2. Outer Diameter (OD): The OD of the flange is determined by the NPS and the flange class. For Class 600, the OD ranges from 3.50 inches (89 mm) for NPS 1/2 to 26.00 inches (660 mm) for NPS 24.

  3. Thickness (T): The thickness of the flange varies based on the NPS and ranges from 0.75 inches (19 mm) for NPS 1/2 to 2.25 inches (57 mm) for NPS 24.

  4. Neck Length (L): The length of the neck, which is the cylindrical portion of the flange that extends beyond the raised face, is specified in the standard. For Class 600, the neck length ranges from 0.75 inches (19 mm) for NPS 1/2 to 1.50 inches (38 mm) for NPS 24.

  5. Raised Face Height (H): The height of the raised face, which is the annular projection on the flange surface, is also provided in the standard. For Class 600, the raised face height ranges from 0.19 inches (4.8 mm) for NPS 1/2 to 0.31 inches (7.9 mm) for NPS 24.

  6. Bolt Hole Circle Diameter (D): The diameter of the bolt hole circle, which determines the number and placement of the bolt holes, is specified based on the NPS and flange class. For Class 600, the bolt hole circle diameter ranges from 4.75 inches (121 mm) for NPS 1/2 to 24.00 inches (610 mm) for NPS 24.

  7. Bolt Hole Diameter (d): The diameter of the individual bolt holes is also provided in the standard. For Class 600, the bolt hole diameter ranges from 0.75 inches (19 mm) for NPS 1/2 to 1.75 inches (44 mm) for NPS 24.

  8. Number of Bolt Holes (n): The number of bolt holes varies depending on the NPS and flange class. For Class 600, the number of bolt holes ranges from 4 for NPS 1/2 to 24 for NPS 24.

It is important to note that the dimensional specifications provided in the GB/T9124.2-2019 standard are subject to manufacturing tolerances and should be verified with the flange manufacturer or the relevant technical documentation.

 

Nominal size Steel pipe
outer diameter A  / mm
 Connection size Flange
thickness C  / mm
 Flange height H  / mm

 neck Flange inner diameter B  / mm

 Sealing surface diameter R  / mm

 Sealing surface thickness f 1  / mm

 
DN  NPS Flange outer diameter D  / mm

 Bolt hole center circle diameter K  / mm
 Bolt hole diameter L  /mm

 bolt
Quantity n  /  pcs
 Thread specification
 		 N / mm r / mm
15  1/2 21.3 95 66.7  16  4 M14 14.3  22 38 ≥4 22.2  34.9  7
20  3/4 26.9  115 82.6  19  4 M16 15.9  25 48 ≥4 27.7  42.9  7
25 1 33.7  125 88.9  19  4 M16 17.5  27 54 ≥4 34.5  50.8  7
32 1 ¼ 42.4  135 98.4  19  4 M16 20.7  29 64 ≥4 43.2  63.5  7
40 1 ½ 48.3  155 114.3  22  4 M20 22.3  32 70 ≥4 49.5  73.0  7
50 2  60.3  165 127.0  19  8 M16 25.4  37 84 ≥4 61.9  92.1  7
65 2 ½ 73.0  190 149.2  22  8 M20 28.6  41 100 ≥4 74.6  104.8  7
80 3  88.9  210 168.3  22  8 M20 31.8  46 117 ≥4 90.7  127.0  7
100 4 114.3  275 215.9  26  8 M24 38.1  54 152 ≥4 116.1  157.2  7
125 5 141.3  330 266.7  29  8 M27 44.5  60 189 ≥4 143.8  185.7  7
150 6 168.3  355 292.1  29  12 M27 47.7  67 222 ≥4 170.7  215.9  7
200 8 219.1  420 349.2  32  12 M30 55.6  76 273 ≥4 221.5  269.9  7
250 10 273.0  510 431.8  35  16 M33 63.5  86 343 ≥4 276.2  323.8  7
300 12 323.8  560 489.0  35  20 M33 66.7  92 400 ≥4 327.0  381.0  7
350 14 355.6  605 527.0  39  20 M36 69.9  94 432 ≥4 359.2  412.8  7
400 16 406.4  685 603.2  42  20 M39 76.2  106 495 ≥4 410.5  469.9  7
450 18 457  745 654.0  45  20 M42 82.6  117 546 ≥4 461.8  533.4  7
500 20 508  815 723.9  45  24 M42 88.9  127 610 ≥4 513.1  584.2  7
550 22  559  870 777.7  48  24 M45 95.2  133 663 ≥4 564.4  641.4  2
600 24 610  940 838.2  51  24 M48 101.6  140 718 ≥4 616.0  692.2  7
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