Orifice flanges and Orifice Plates

An Orifice flange is designed to measure flow. They sit either side of an orifice plate which is a controlled restriction. The Orifice plate fits in the line between two flanges and is bolted in place. Fluid dynamics then enables the designer to monitor the flow by monitoring the pressure before and after the orifice.

An Orifice flange (assembly) consists of two ported flanges, plugs, a jacking bolt, and may or may not be supplied with bolts.

Orifice Flange Stamping

Typically an orifice flange will have stamped on it size, rating, standard, material, heat number, Balcombe Stamp, and production traceability code.

Many clients ask to have their own part identification and process traceability stamped on the Orifice Flange.

Orifice Plates

The Orifice Flanges surround an Orifice Plate. This Orifice plate provides a known aperture that can be used with other process factors to calculate flow information.

Orifice Plates Stamping

Typically an orifice plate will have stamped on it size, rating, standard, material, heat number, Balcombe Stamp, and production traceability code.

Many clients ask to have their own part identification and process traceability stamped on the Orifice Plate.

Orifice Flange Standards

Balcombe Engineering manufactures and stocks Orifice Flanges in Australia for a variety of industries. The most commonly used standards is ASME B16.36 which covers Orifice Flanges for pipes up to nominal bore of 600mm depending on the pressure class. This standard refers repeatedly to B16.5 and uses the B16.5 hole and sealing face diameter. Mostly B16.5 weldnecks cannot be converted to Orifice flanges.

Other standards exist and Balcombe Engineering are able to rapidly manufacture Orifice Flanges to comply with these standards or company specific drawings.

Orifice Flange/Plate Sealing Finishes

Typically, Orifice Flanges and plates are produced as a flat face, raised face or ring joint sealing surface depending on the application requirement. The finishes are identical to the finish under ASME B16.5. The spiral sealing face is a specified finish typically Ra 3.2µm-6.3µm.

Orifice Flange Material

As an Australian manufacturer Balcombe Engineering are able to manufacture Orifice Flanges in a material with the testing as required by the client specification. Typically, Orifice Flanges will be manufactured from carbon or stainless steels. Typical carbon steel materials are forgings like A105, A350 LF2, A350 LF3. In corrosion resistant materials A182 F316L, F304L, UNS31803 are common. Less common but easily supplied is Duplex F51 and Incoloy 625.

Additionally specialist finishes are available such as galvanising, PTFE coatings and linings and various epoxy finishes

Corrosion Protection and Packaging

An Orifice Flange will always have 2 sealing faces and two weld preparations so requires significant face protection.

Whether you want the Orifice Flanges protected for 2 weeks or 2 years Balcombe Engineering have packing system that ensures that Orifice Flanges arrive at the installation in good condition.

Even more robust corrosion protection can be supplied upon request.

Special Orifice Flanges

Sometimes a specific engineering requirement may dictate the need for special material and construction required to produce the Orifice Flanges. Typical changes are the number and type of ports. The ports may be screwed, socket welded or have flanged extensions welded to them.

Balcombe Engineering are a manufacturer with full ISO 9001 certification and are able to produce to your requirements including detailed testing and documentation. All material is traced through the system and ITP”s and MDR”s are available on request. Your Orifice Flanges can be packaged according to your engineering or project specification and all this can be done with remarkably short delivery times.

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