• Design to BS EN ISO 5167
  
• Range of Carrier Types
  - Single Ring, Corner Tappings
  - Double Ring, Flange Tappings
  - Double Ring, Corner Tappings
  - Double Ring, Annular Chambers
  
• Wide range of materials
  
• Proven technology
  
• Suitable for 1” lines and above
  
• Orifice sizing on request

General Description
The orifice plate is the most common differential pressure flow primary element. It is based on proven technology, has no moving parts and is suitable for high temperature and pressure applications. Orifice plates are recommended for clean liquids, gases and low velocity steam flows.

Flow measurement using orifice plates requires the accurate location of upstream and downstream pressure tappings. Various types of orifice carrier assemblies are available to suit a wide range of applications.

Orifice flange assemblies in accordance with ANSI B16.36 are also available.

Pressure Connections
The style of the pressure tappings may be as follows:-
(a) Flange Tappings - located 25.4 mm upstream and 25.4 mm downstream from the corresponding
face of the orifice plate.
(b) Corner Tappings - single tappings located flush with the upstream and downstream faces of the
orifice plates.
(c) Annular Chambers - slots located flush with the upstream and downstream faces of the orifice
plate.

Flange tappings are recommended for general applications. Corner tappings or annular chambers are
particularly recommended for use in small lines (less than 50 mm diameter) and when the orifice plate is either of quarter circle, conical entrance or eccentric in design.

Double Ring Orifice Carriers
Double ring orifice carrier are designed to be mounted between standard pipe flanges. Versions are available to suit all common flange standards, including ANSI B16.5.

Double ring orifice carriers may be provided with flange tappings, single corner tappings or annular chambers. Double ring orifice carriers use a standard tab handled plate, which allows for easy replacement of the plate if it is damaged, or changes in process data necessitate a change of orifice bore.

Standard material of construction is 316L Stainless Steel, but a wide range of alternative common and exotic materials are available. Gaskets are provided - 1.5 mm thick non asbestos type, unless requested otherwise.

Annular Chamber Orifice Carriers
Annular chamber type orifice carriers are a special form of corner tappings. The annular slots break through to the pipe over the entire perimeter.

Versions to suit other flange sizes and ratings are available on request.

Single Ring Orifice Carriers
The single ring orifice carrier is a simple, compact orifice carrier, which may be machined in one piece, or be provided with a screwed-on plate. This carrier occupies the minimum of space between the pipeline flanges.

Standard material of construction is 316L Stainless Steel. Due to its small thickness, the single ring orifice carrier is often a cost effective solution, and may be manufactured in a wide range of exotic materials including Hastelloy®, Monel®, Duplex Stainless Steel, Inconel® and Incoloy®

British Rototherm Company Limited,
Kenfig Industrial Estate, Margam,
Port Talbot   SA13 2PW
United Kingdom

Telephone: +44 (0) 1656 740 551
Facsimile: +44 (0) 1656 745 915
E-mail: rototherm@rototherm.co.uk

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