Compact Orifice Steam

The Compact Orifice flow meter for steam is a standardised product based on well proven and widely accepted technology. The Compact Orifice Steam meter is a flow orifice assembly designed to slip between DIN and ANSI flanges, and is designed for compact mounted d/p cells. With an installation length of 32mm it can be installed in existing systems simply and easily, and incorporates the d/p flow principle. d/p metering enables easy re-calibration routines for process operators, negating the need for expensive flow metering spares and external flow recalibration services.

Benefits

• Sizes ranging from DN 40 (1½") up to DN 400 (16").
• No moving parts.
• Not sensitive to vibrations.
• Compact design.
• Easy to install.
• High accuracy.

Typical Applications

The Compact Orifice Steam flow meters measure the flow of saturated and superheated steam within the process industries, including chemical, petro-chemical, pharmaceutical and the power industry. The Compact Orifice Steam is based on the principle of measuring velocity in the pipe line, therefore the flow measurement is volumetric. The Compact Orifice Steam flow meters are backed by international standards covering flow calculation, manufacturing tolerances, accuracy and installation requirements. This type of fundamental technology is accepted world wide and supported by millions of successful installations.

The Compact Orifice Steam flow meter features are:

• Standardised product based on well proven technology.
• Compact design.
• Simple construction.
• Standardised construction means low inventory.
• No moving parts.
• Not sensitive to vibrations.
• The electronics delivers output signal linear to flow.
• Digital indicator for local flow reading.
• High accuracy.
• Wide rangeability.
• Easy to install.
• Easy to re-calibrate.

Accessories

Remote electronic indicator with LCD is available for local flow indication and if required check/change of flow rate (differential pressure).

Principle of Measurement

The Compact Orifice Steam is a velocity flow meter.
A restriction in a pipe line changes the value of respective momentum energies, in terms of static and dynamic pressure.
Based on the laws of energy balance developed by Bernoulli, the sum of the energies remain constant.
Increasing the velocity in the pipe line, decreases the pressure in the restriction.
The pressure differential between the inlet pressure and the pressure in the restriction is measured and expressed as flow velocity.
When the physical values of the fluid are known and the inner pipe diameter is established the electronics calculates the flow rate. The flow rate is expressed in an analogue signal 4 - 20 mA signal or via digital communication.

Installation Orientation

Technical Data

• Sizes : DN 40 - DN 400, 11⁄2" - 16", larger sizes on request
• Pressure rating : up to PN 40, 300 lbs, higher pressure ratings on request
• Temperature : Process : up to 400°C,
• Mounting style : Between flanges according to DIN or ANSI standards
• Flange facing : flat face (standard), raised face, DIN 2512 N, DIN 2513 R
• Overall length : 32 mm
• Material : Stainless steel AISI 316, others on request
• Design and calculation standards : ISO 5167, ASME MFC-3M.
• Vent or drain hole : On request
• β (d/D) : 0,5 and 0,6; other β on request.
• Accuracy : +/- 1.2 %
• Rangeability : 8:1
• Repeatability : better than 0,1 %
• Pressure loss : typical 150 mbar for liquid flow, and 50 mbar for gas flow (values are given at full flow)
• Reynolds No : Re > 5000
• Allowable differential pressure : max 2,5 bar
• Output signal : analogue 4 - 20 mA or Digital communication via protocol, HART, PROFIBUS, Fieldbus Foundation or others.
  Local indicator (option): LCD showing flowing units or %
• Power supply : 14 - 36 Vdc, typical 24 Vdc.
• Max load (24 Vdc) : 700 Ohm
• Enclosure : IP 67
  Ex protection : intrinsically safe EEx ia IIC T6,Explosion proof EEx d IIC T6
  Temperature : Ambient : -40 - +80°C

Sizes

DIN Flanges

 ANSI flanges

Overall Dimensions

Installation Requirements

The Compact Orifice Steam flow meter can be mounted in a horizontal or vertical pipe. The condensing pot arrangement shall be mounted horizontally with the outlet pointing downwards. To insure high accuracy of measurement, long straight pipe runs up-stream from the flow meter is necessary. The required straight pipe run depends on the disturbance upstream. To maintain the 1.2% accuracy the minimum straight pipe run upstream shall be 14 x inner pipe diameter and 6 x downstream If an additional inaccuracy of 1⁄2 % is acceptable the required straight pipe runs are reduced to half of the above values. If mass flow is required for saturated steam, ask for a multi variable transmitter. If mass flow is required for superheated steam, ask for mass flow and multivariable transmitter.

Works with:-

Differential pressure transmitters:-IDP10; IDP15; IDP25; IDP31; IDP50
And all our Absolute Pressure and Gauge Pressure transmitters, Temperature sensors and mass flow computers.
MultiVariable Transmitters :- IMV25, IMV30

Supplied by DP-Flow