Short Description

Model No.: Alloy-31-Orifice-Flange-Welding-Neck-Raised-Face-6"-SCH10S-Class300

China Flange Manufacturer www.steeljrv.com offers ASME B16.36 Alloy 31 Orifice Flange Welding Neck Raised Face, 6″, SCH10S, Class300.

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Key Specifications / Features

Type: Alloy 31 Orifice Flange
Material: Alloy 31 (Alloy 1.4562 / UNS N08031)
Size: 6″ (DN150)
WT: Sch10s
Standard: ASME B16.36

China Orifice Flange Manufacturer Yaang offers Alloy 31 Orifice Flange Welding Neck Raised Face, 6″, SCH10S, Class300.

Alloy 31 is a nickel, chromium and molybdenum stainless steel with nitrogen and cupper additions. It combines moderate tensile strength and high ductility with excellent corrosion resistance in sulfuric acid, reducing and oxidizing media and has strong resistance to corrosion and erosion corrosion in phosphoric environment.

Typically the alloy has PREN of ≥ 48, which ensure that the resistance to pitting corrosion is high.

Chemical Composition – Alloy 31 (Alloy 1.4562 / UNS N08031)

Alloy 31, N08031, 1.4562,
Chemical composition(%) Carbon, max 0.015
Manganese, max 2.0
Phosphorus, max 0.020
Sulfur, max 0.010
Silicon, max 0.3
Nickel 30.0~32.0
Chromium 26.0~28.0
Molybdenum 6.0~7.0
Copper 1.0~1.4
Nitrogen 0.15~0.25
Iron balance
Tensile strength(MPa, min) 650
0.2% Yield strength(MPa, min) 276
Elongation(%, min) 40

What Is An Orifice Flange?

An Orifice Flange is used in combination with orifice meters to measure the flow rate of oil, gas and other liquids conveyed by the pipeline. Orifice flanges are manufactured to ASME B16.36 in multiple sizes and, material grades. 

An orifice flange is used to measure the flow of the fluid conveyed by the pipeline via a flow nozzle positioned on the flange itself. Pairs of pressure tappings are machined onto the orifice flange, making separate tappings on the pipe wall unnecessary.

The traditional orifice flange assembly consists of a pair of flanges, orifice plate, bolts, nuts, gaskets, jacking screws and plugs. Jacking screws ensure the easy removal of the primary flow element.

Orifice flanges are available in all ASTM forged grades (ASTM A105, ASTM A350, ASTM A694, ASTM 182 respectively for carbon, alloy and, stainless steel flanges), dimensions (combinations of nominal sizes and pressure ratings) and, in socket weld, threaded or weld neck shape (WN is the most used).

The range of orifice flanges covers all standard sizes and ranges, and all common flange materials. Flanges are available in Welding Neck, Slip On, and Threaded form, and are typically supplied with two 1/2″ NPT tappings in each flange.

ASME B16.36 covers Dimensions and dimensional tolerances from orifice flanges (similar to those covered in ASME B16.5) that have orifice pressure differential connections. Coverage is limited to the following flanges:

  • WELDING NECK CLASSES 300, 400, 600, 900, 1500, 2500
  • SLIP ON CLASS 300
  • THREADED CLASS 300

ORIFICE FLANGE DIMENSIONS (WELD NECK, CLASS 300 RF)

2018762018493601672 - ASME B16.36 Alloy 31 Orifice Flange Welding Neck Raised Face 6" SCH10S Class300

NPS A R O T H X Tg
1 33.4 50.8 125 36.6 81 54 6.4
48.3 73 155 36.6 84 70 6.4
2 60.3 92.1 165 36.6 84 84 6.4
73 104.8 190 36.6 87 100 6.4
3 88.9 127 210 36.6 87 117 9.5
4 114.3 157.2 255 36.6 90 146 12.7
6 168.3 215.9 320 36.6 98 206 12.7
8 219.1 269.9 380 39.7 110 260 12.7
10 273 323.8 445 46.1 116 321 12.7
12 323.8 381 520 49.3 129 375 12.7
14 355.6 412.8 585 52.4 141 425 12.7
16 406.4 469.9 650 55.6 144 483 12.7
18 457 533.4 710 58.8 157 533 12.7
20 508 584.2 775 62 160 587 12.7
24 610 692.2 915 68.3 167 702 12.7

2018762020283878665 - ASME B16.36 Alloy 31 Orifice Flange Welding Neck Raised Face 6" SCH10S Class300

NPS Bolt Diameter # Bolts Bolt holes diameter Bolts Diameter  Bolts lenght mm.
1 88.9 4 11/16  5/8 125
114.3 4 13/16  3/4 135
2 127 8 11/16  5/8 125
149.2 8 13/16  3/4 135
3 168.3 8 13/16  3/4 135
4 200 8 13/16  3/4 135
6 269.9 12 7/8  3/4 135
8 330.2 12 1  7/8 145
10 387.4 16 1 1/8 1 165
12 450.8 16 1 1/8 180
14 514.4 20 1 1/8 185
16 571.5 20 1 3/8 195
18 628.6 24 1 3/8 205
20 685.8 24 1 3/8 215
24 812.8 24 1 3/8 240

COMMENTS: Height of Raised Face (RF) in CLASS 300 is 2 mm

2018762016146801577 - ASME B16.36 Alloy 31 Orifice Flange Welding Neck Raised Face 6" SCH10S Class300


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