ISO 5167-2 primary element

Standard Orifice Plates — ISO 5167 DP Flow Meter

Name: Standard Orifice Plates
Brand: Shizhong
SKU: standard-orifice-plates

A standardized differential-pressure primary element for liquids, gases and steam, manufactured with controlled dimensions for repeatable installation.

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Integrated Standard Orifice Flow Meter

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Wide-range measurement built around your process

Per ISO 5167-2:2022, standard orifice plate assemblies provide a robust, well-understood measurement path for process control and eligible custody-transfer applications. Within the ISO scope, Shizhong uses geometrical verification; complete-system flow calibration is provided when the customer requires it. Integrated concealed-orifice assemblies below DN50 are outside ISO 5167-2 and require individual flow calibration.

Key design features

Standardized calculation basis with geometrical verification inside the ISO 5167-2 scope

Multiple pressure-tap arrangements: corner (including annular chamber), flange, and D-D/2

Complete-system flow calibration when requested by the customer

Integrated concealed-orifice assemblies below DN50 require individual flow calibration

DN650+ designs matched to pipe outside-diameter Series A or B

Replaceable primary element with project-specific materials and ratings

Technical specifications

Standard Orifice Plates technical specifications
Nominal size (DN)	DN50–DN2000 subject to project-specific design; DN650+ matched to pipe outside-diameter Series A or B
Beta ratio (β)	0.10–0.75 (per ISO 5167-2:2022; practical range 0.20–0.75)
Reynolds number range	Per ISO 5167-2:2022 limits; verify at minimum flow
Pressure tapping	Corner, flange, or D and D/2 taps
Accuracy	±0.5%–1.0% of rate (β and Reynolds dependent)
Turndown ratio	10:1 typical (single transmitter); up to 30:1 with dual-range
Material options	304SS, 316L SS, Carbon steel, Hastelloy C-276, Monel
Temperature range	-196°C to +600°C; material, pressure class, seals and instrumentation selected for the project
Pressure rating	PN2.5–PN420 / ASME Class 150–2500 subject to project-specific design
Permanent pressure loss	40%–90% of measured ΔP (high)
Straight-run requirement	5D–80D upstream (ISO 5167 Table 1, fitting dependent)
Discharge coefficient	0.58–0.65 (Reader-Harris/Gallagher formula)
Standards / metrology basis	ISO 5167-2:2022 within scope; geometrical verification, or complete-system flow calibration on customer request

Typical applications

Oil and gas metering

Steam and feedwater

Chemical process lines

Custody-transfer projects

Final specifications are confirmed against process data, piping, material, pressure class, applicable code and metrology requirements.

Related products

Adaptive Wide-Range DP FlowmeterMeasure stable low demand and peak flow with one integrated DP platform. The approved public baseline is 100:1, with ±1% in the normal operating band and ±3.75% at switching points and the two range ends.Flow NozzlesISO 5167-3 ISA 1932 and long-radius flow nozzles engineered for steam, feedwater, gas and demanding high-pressure service.

Related technical resources

Orifice vs Venturi vs Balanced Flow MeterFull engineering comparison table with selection guidance

Need full specifications?

Request a detailed datasheet with dimensional drawings, material certificates and ordering information for Standard Orifice Plates.

Production and documentation schedules are confirmed in the quotation after technical review and drawing approval.

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