Differential Pressure Instruments For Flow

SKI offers DP flow measurement of gases, liquids and steam based on the international standard ISO 5167.

Ski Orifice Plates With Integral Taps Cmc
Ski Orifice Plates With Annular Chambers Cmc
Ski Classical Venturi Tubes Cmc
Ski Orifice Plates Cmc

Differential Pressure Instruments For Flow (According to ISO 5167)

ISO 5167-compliant differential pressure instruments are used in the majority of industrial sectors. The variety of throttling devices and materials available allows for the measurement of a wide range of fluids at varying flow rates, temperatures, and pressures.

Because of their standardisation, the expected measurement results are manufacturer-independent.

The ISO 5167 standard provides detailed descriptions of the design features, constraints, and error limits of the various differential pressure flow elements. The application area includes technical gases, compressed air, fresh and combustion air, steam/heat quantities, heat transfer fluids and water.

The following is a general description of the various elements SKI offers.

Ski Differential Pressure Instruments For Flow Cmc

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Differential Pressure Instruments

Ski Orifice Plates With Integral Taps Cmc

Orifice Plates With Integral Taps

  • Cost effective, single body.
  • Two pressure tapping points.
  • Easy installation.
  • Good accuracy, reasonable inlet/outlet runs.
Ski Orifice Plates With Annular Chambers Cmc

Orifice Plates With Annular Chambers

  • Clamped between annular chamber rings.
  • Pressed between standard pipe flanges.
  • Pressure measured upstream and downstream.
  • Accuracy comparable to standard orifice.
Ski Meter Runs Cmc

Meter Runs

  • Differential pressure element with inlet/outlet pipe sections.
  • Used for small pipelines.
  • Pipe tolerances impact measurement accuracy.
  • Typically uses annular chamber orifice plate.
Ski Orifice Plates Cmc

Orifice Plates

  • Orifice plate with welded-on handle.
  • No pressure taps.
  • Mounted between flanges.
  • Flanges contain ½” NPT pressure taps.
Ski Nozzles Cmc

Nozzles

  • Two categories: ISA 1932 nozzles and long radius nozzles.
  • ISA 1932: high accuracy, low pressure loss, used in power plants, multiple tap designs.
  • Long radius: similar applications, excellent abrasion resistance, poorer linearity.
  • Same design options as ISA 1932 nozzles.
Ski Venturi Nozzles Cmc

Venturi Nozzles

  • Suitable for gases, steam, liquids.
  • Good accuracy, low pressure loss.
  • Excellent wear resistance, reduced linearity.
  • Tap designs: corner, annular, flange ring, socket ring.
Ski Classical Venturi Tubes Cmc

Classical Venturi Tubes

  • Differential pressure elements.
  • Very low permanent pressure losses.
  • Used in short straight pipe runs.
  • Good measuring accuracy.
  • Tap designs: corner, annular chamber.
Ski Cone Flow Meters Cmc

Cone Flow Meters

  • Pipe section with a welded cone.
  • Cone size increases with flow direction.
  • Used in short pipe run applications.
  • Most inaccurate in ISO 5167 ( ±5%\pm 5\% error).
  • Good accuracy when laboratory calibrated.

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DPI

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