• Wide range of materials, including
  - ASTM A105N Carbon Steel
  - ASTM A350 LF2 Carbon Steel
  - ASTM A182 F316L Stainless Steel
  
• Ratings from 300 lb to 2500 lb
  
• Sizes from 1” Nominal Bore
  
• Corner Tapping Versions Available

General Description
Orifice flanges are intended for use instead of standard pipe flanges when an orifice plate or flow nozzle must be installed. Pairs of pressure tappings are machined into the orifice flange, making separate orifice carriers or tappings in the pipe wall unnecessary.

The range of orifice flanges covers all standard sizes and ranges, and all common flange materials. Flanges are available in socket weld or weld neck form, and are typically supplied with two ½” NPT tappings in each flange. Jacking screws to ensure ease of removal of the primary flow element are provided.

Orifice plates and flow nozzles can also be supplied. See individual Product Data Sheets for more information.

Orifice flanges may also be supplied complete with bolting and gasket kits.

Materials
We can supply orifice flanges in a wide range of standard and special materials, including:

• ASTM A105 Carbon Steel
  
• ASTM A350 LF2 Low Temp Carbon Steel
  
• ASTM A182 F316 Stainless Steel
  
• ASTM A182 F304 Stainless Steel
  
• ASTM A182 F11 1¼% Cr ½% Mo
  
• ASTM A182 F22 2¼% Cr 1% Mo

Pressure Tappings
As standard, two ½” NPT tappings are provided in each flange, one with a plug. Other thread sizes are available on request. Socket weld connections may be specified, and butt weld pipe nipples are also available. Tappings are generally ‘flange’ type, but corner tappings are optional.

Gaskets
A range of suitable gaskets for use with orifice flanges is also available.
Typical specifications include:

• - 1.5 mm thick IBC ring type, non asbestos
• - 3.2 mm thick sprial wound type, carbon steel outer, stainless steel inner, 316L windings with graphite filler

Studbolts and Nuts
Suitable bolting may be supplied on request. Standard materials include:
- ASTM A193 B7 and ASTM A194 Gr 2H
- ASTM A320 L7 and ASTM A194 Gr 4 or 7
- ASTM A320 B8 and ASTM A194 Gr 8
Bolting conforming to NACE is also available.

Weldneck Orifice Flange Assemblies
Weldneck orifice flanges are butt-welded into the pipline. The inside diameter (or the schedule) of the pipe should be specified when ordering.

Weldneck orifice flanges are available in classes 300, 600, 900, 1500 and 2500. Raised face (RF) and ring type joint (RTJ) versions can be supplied.

Slip-On Orifice Flange Assemblies
Slip-on orifice flanges are designed to slip over the pipeline before welding. Slip-on orifice flanges are available in class 300, with a raised face (RF).

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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British Rototherm Company Limited is Registered in Wales: 2570730