Orifice Assemblies

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Series : AO

Typical assemblies


Orifice Plate with weld neck flange union

The weld neck flange is normally referred to as " high Hub" flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange. The pressure tappings are provided through the flangewhich arte at a distance of 1" from the face of the plate (shown in the drawing attached). Weld neck flanges are prefered where radiography on welding is involved.

 

Orifice Plate with slip on flange union

The slip on flange has a low hub because the pipe slips into the flange prior to welding. It is welded both from inside and out to provide sufficient strength and prevent leakage. The slip on flanges are bored slightly larger than the OD of the matching pipe.

 

Orifice Plate with male-female carrier ring and flanged union

The construction is similar to the above except male-female carrier ring is provided to facilitate pressure tapping through it (corner tapping). This construction is generally used for lower line sizes (normally less than 2"). Carrier rings are also available for bigger sizes on request. Carrier ring machined from single block is also offered in place of male-female carrier. For better accuracy, honed meter run assemblies are recommended which employ upstream and downstream straight lengths. The end connection in such case can be plain (suitable for welding) or flanged.

  • Features
  • Datasheet
  • Informations

Spécifications

Design
Conforms to ISA RP 3.2 , DIN 1952 , BS 1042, ISO-5167

Types
Square edge concentric, Quadrant edged, Conical entrance, Eccentric, Segmental

Plate material
SS304 , SS316 , SS316L as standard. Hastelloy-C , Monel , PP , PVC , PTFE coated , etc. can be given on request.

Orifice Bore
In accordance with ISO-5167, BS-1042, ASME MFC 3M, R.W.Miller, L.K.Spink, AGA-3

Tab Plate
In the same material as plate & is welded to orifice plate. Tab plate integral to the Orifice plate (i.e. without welding) can also be offered as a special case.

Vent / Drain
Vent or Drain holes are provided as per customer's requirement. The diameter of the vent or drain holes are as per ISA RP 3.2

Flange Union Weld neck, Slip on, Threaded, Socket welded with RF or RTJ facing Orifice flanges are in accordance with ANSI B16.36 with minimum flange rating of 300# for sizes up to 8" or male - female flanges in accordance with ANSI B16.5

Pressure Tappings
Corner tappings are recommended for sizes upto 1 ½"; Flange taps from 2" to 16" ; D - D/2 taps for higher sizes

Gasket

CAF as per IS: 2712 Gr 0/1 , SS spiral wound + CAF , SS spiral wound + Grafoil, SS spiral wound + PTFE are normally supplied as per process requirement. Other materials available on request. For RTJ flanges , the plate is fixed on the plate holder. The plate holder is in Soft Iron material & acts as a gasket.

 

Studs / Nuts ASTM A193 Gr.B7/A-194 Gr.2H as standard, Other material on request.

Jack Screw ASTM A193 Gr.B7/A-194 Gr.2H as standard, Other material on request.

Download the datasheet répéteur RS422/485 (PDF Orifice Plates)

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