Daniel Orifice Flange Unions

About the Daniel Orifice Flange Unions

Quality Beyond Compare

Daniel Orifice Flange Unions come with carbon steel or stainless steel assembly and incorporate exceptional performance and durability. Each Daniel OFU meets or exceeds AGA 3/API 14.3 standards due to expert manufacturing. They are available in line sizes 2-inch to 8-inch and ANSI 600 to 2500.

Specifications of the Daniel Orifice Flange Unions

Mechanical Ratings	Standard: 2-in to 8-in, ANSI 600-2500 Consult factory for other options
Flange Face And End Connections	Standard: Raised face weldnek and ring-joint weldnek
Assembly	Carbon Steel: furnished complete with studs (ASTM A-193 GR B7), nuts (ASTM A-194 GR 2H), (2) 0.0625-in non-asbestos gaskets and (2) jackscrews Stainless Steel: furnished complete with zinc plated studs (ASTM A-193 GR B7), nuts (ASTM A-194 GR 2H), (2) 0.0625-in non-asbestos gaskets and (2) jackscrews
Differential Pressure Taps	Location and number of tap holes Standard: 2 tap holes with orientation on top and bottom 180 deg apart, in accordance with API 14.3 (AGA3) or ISO 5167 Consult factory for other tap location and number of tap options Process connection Standard: .50-in NPT standard Consult factory for other options Types of tap connections Standard: Threaded Optional: Socket weld Consult factory for other options Line bore tolerances Standard size: Sch 40 and 80 Consult factory for other options
Temperature Range	Standard: -20°F to +250°F (-29°C to +121°C) Standard (low temperature): -100°F to +250°F (-73°C to +121°C) Consult factory for other options
Material Specifications	Standard: A105 Carbon Steel and A350 LF-2 (low temperature applications) Consult factory for other options
Flow Measurement Code	API 14.3 ISO-5167
Design Code	ASME B16.36
Gaskets	Standard gaskets for RF flanges are 0.625-in thick. (0.125-in thick gaskets are available as an option.) Grafoil gasket Spiral wound gasket without inner ring Garlock gylon Spiral wound gasket with inner ring RTJ Flanges use Daniel model 560 or 590 style plate holders. The plate holder is designed with an equivalent ring gasket to match the R-number based on size and pressure class.

Features of the Daniel Orifice Flange Unions

Bore Tolerances satisfy the latest recommendations of API-14.3.

Pressure Tap Hole Location is closely regulated. Tap hole centers are 0.938-in from bearing faces of raised face flanges, locating their centerline 1-in from the face of the orifice plate when 0.063-in gasket thickness is incorporated.

1. For 3-in and smaller flanges, tap location tolerance is ± 0.016-in.

2. For 4-in and larger flanges, tap location tolerance is ± 0.031-in.

Pressure Tap Holes – Tap hole edges on the flange bore surface are carefully examined to ensure they are free from burrs. All roughness is removed. Sizes are shown in the following tables.

Flange Tap Connections – Standard connections are .50-in NPT and other sizes and types are available on request.

Gaskets – Two 0.063-in thick(1) precision die-cut gaskets are supplied with all raised face orifice flanges. Non-asbestos gaskets are standard.

Dowel pins: Alignment dowel pins of the knock-out type are supplied as standard on all 2-in to 8-in raised face orifice flanges. The pins facilitate the correct alignment of the flange bores as well as ensure the orifice plate bore is centred to the flange bores within the tolerances of API-14.3.

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