ISO 5167-2 primary element
Standard Orifice Plates — ISO 5167 DP Flow Meter
A standardized differential-pressure primary element for liquids, gases and steam, manufactured with controlled dimensions for repeatable installation.
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
Related Solutions
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.
ENGINEERING ANSWER UNITS
Application boundaries, selection and troubleshooting
These product-specific answers retain the source evidence, calibration limits and conditions where a different measurement route is preferable. Values that cannot be confirmed from the approved source remain subject to project review or pending field test; no unverified value is supplied here.
Dataset v1.5.0; last reviewed 2026-08-24. Evidence IDs are retained in the translation dataset.
How does a standard orifice-plate flowmeter differ from other meters, and when can it replace them?
Replacement: Where the standardized route applies, a domestic standard orifice assembly can replace an imported assembly such as an Emerson/Rosemount 405 or 1595. An integrated multivariable package can also replace a split imported primary-element and transmitter arrangement. Use it when: The fluid is clean, single-phase natural gas, steam or water; sufficient straight pipe is available; and the project needs standards-based design verification or controlled procurement cost. Do not force the substitution when: The fluid is dirty, solids-bearing or highly viscous at low Reynolds number; straight pipe is inadequate; permanent pressure loss is critical; or the required turndown exceeds orifice capability. Emerson and Rosemount are trademarks of their respective owners; this comparison uses public information available as of 2026-08, is not affiliated with those owners, and is not intended to disparage them.
COMPARISON REPLACEMENT · HIGH source confidence
When is a standard orifice plate recommended, and when should another measurement route be compared?
Recommended application: Use a standard orifice plate for a clean, single-phase fluid with the straight runs required by the standard when the project needs a mature standardized geometry and a traceable calculation route for the discharge coefficient. Within its applicable envelope, the geometry, tapping and installation can be designed to the standard without making individual flow calibration a prerequisite. Prefer another route when: The fluid is dirty, solids-bearing or highly viscous at low Reynolds number; straight pipe is limited; permanent pressure loss is critical; or the required turndown exceeds orifice capability. Compare wedge, V-cone, Venturi or wide-range routes. Standards basis: GB/T 2624.2-2006 and ISO 5167-2:2022.
RECOMMENDATION COMPARISON · HIGH source confidence
What should be checked when a standard orifice flowmeter reads high or low, fluctuates, or produces no signal?
Symptom: The indicated flow is low, high, unstable or absent. Possible causes: A blocked or leaking high- or low-pressure impulse line, reversed plate orientation, a worn sharp edge, a gasket protruding into the bore, or a fault in the three-valve manifold or power supply. Action: Check the power supply and manifold first, then clear blockages, find leaks, and vent gas or drain liquid as appropriate. After isolating and depressurizing the line, verify plate orientation, sharp-edge condition, bore and gasket; replace parts if necessary, then re-zero the system.
TROUBLESHOOTING · HIGH source confidence
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