ASME B16.36 ASTM B564 UNS N08020 Alloy 20 orifice flange orifice plate
1. Alloy 20 orifice flanges brief introduction
Orifice Flanges are used with orifice meters for the purpose of measuring the flow rate of either liquids or gases in the respective pipeline. Pairs of pressure "Tappings", mostly on 2 sides, directly opposite each other, are machined into the orifice flange. This makes separate orifice carriers or tappings in the pipe wall unnecessary.
Orifice Flanges generally come with either Raised Faces or RTJ (Ring Type Joint) facings. They are, for all intensive purposes, the same as weld neck and slip on flanges with extra machining.
The image on the right shows a set Orifice Flanges, where a Orifice Plate is mounted and a jack screw is machined. This jack screw is used to facilitate separating the flanges for inspection or replacement of the Orifice Plate and gaskets.
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.
2. Alloy 20 orifice flange dimensioin
| RANGE | 1" TO 24” |
| CLASS | 300# FOR WN, SO and threaded flange 600#, 900#, 1500#, 2500# FOR WN FLANGE |
| FORMS | Weld Neck Flanges, Slip On Flanges, threaded flange |
| STANDARD | ANSI 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: |
| Grade | Hastelloy: HastelloyB3/B2/X/C/C22/C276/G-30
Inconel: inconel600/625/718/725,
Incoloy: incoloy800/800h/825/925,
Monel: monel400/k500/404,
Nickel: nickel200/201,
Nitronic: Nitronic50/60,
Alloy: Alloy20/28/330/31/33/75, 4J36/1J50/1J79/4J29/4J42,/3J53
Nimonic: nimonic80/80a/90/75, ETC. |
| Price Term | EXW/FOB/CFR/CIF/FCA |
| Package | Wooden case /Wooden crate |
| Delivery time | 40 Days |
3. Alloy 20 orifice flange ASTM Specifications
INCOLOY® alloy 20, Carpenter® 20 alloy, 20CB-3®
INCOLOY® is a registered trademark of the Special Metals Corporation group of companies.
Carpenter® and 20CB-3® are registered trademarks of Carpenter.
Alloy 20 is a nickel-iron-chromium based, austenitic alloy with excellent corrosion resistance in chemical environments containing sulfuric acid and many other aggressive media. This alloy is stabilized with niobium to resist intergranular corrosion. Alloy 20 may provide potential cost savings when carefully compared to higher nickel-based alloys, while out performing standard stainless steels.
Industries and Applications
Alloy 20 is used in a variety of industries, including chemical processing, petrochemical and refining, marine, pharmaceutical and food processing. End use applications include storage tanks, mixing tanks, agitators, pump and valve parts, food processing equipment, fasteners and fittings. Applications are limited to a maximum temperature of 1000°F per ASME. It is also important to determine if the necessary corrosion resistance can be achieved within the given environment.
Chemical Composition (%):
| Iron | Nickel | Chromium | Copper | Molybdenum | Manganese | Niobium* + Tantalum |
| Remainder | 32.00 to 38.00 | 19.00 to 21.00 | 3.00 to 4.00 | 2.00 to 3.00 | 2.00 max | (8 x C) to 1.00 |
| Silicon | Carbon | Phosphorus | Sulfur | | | |
| 1.00 max | 0.07 max | 0.045 max | 0.035 max | | | |
*Niobium (Nb) formerly classified as Columbium (Cb).
Applicable Specifications*
| Form | ASTM | ASME |
| Bar | B473 | SB473 |
| Sheet & Plate | B463 | SB463 |
| Seamless Pipe & Tube | B729 | SB729 |
| Welded Pipe | B464, B4741 | SB464, SB474 |
| Welded Tube | B468 | SB468 |
4. Alloy 20 orifice flange are matched with gasket, fasteners, orifice plate
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ASME B16.36 ASTM B564 UNS N08020 Alloy 20 Orifice Flange Orifice Plate Images
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