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Steam Flow Meters for Saturated & Superheated Steam

Steam is the most expensive utility in most plants and the least measured. A steam flow meter tells you what each header, process line or building is actually consuming, so you can allocate cost, find leaks and failed traps, and verify boiler plant efficiency.

We supply VorTek Instruments vortex and multivariable steam meters for saturated and superheated service. Multivariable models measure velocity, temperature and pressure in a single insertion point and compute true mass flow — which is the number you need. A velocity-only meter will misreport as steam pressure varies, and steam pressure always varies.

Choosing a steam meter

  • Saturated or superheated? Saturated steam density can be derived from pressure alone. Superheated steam needs both pressure and temperature, which means a multivariable meter.
  • Mass flow or volumetric? For cost allocation and energy balance you need mass flow (lb/hr). Volumetric flow at varying pressure is not a usable billing basis.
  • Line size and flow turndown — vortex meters have a minimum velocity below which they stop registering. Oversized lines with low flow are the most common cause of a steam meter reading zero.
  • Insertion or inline? Insertion meters install through a hot tap and suit large lines. Inline meters are more accurate on smaller lines.

See meter selection help for steam metering, or send us your line size, operating pressure, temperature and expected flow range and we will size it.

Steam metering across the wider utility picture

Steam rarely stands alone. Plants that meter steam usually also need compressed air flow metering, BTU metering on the hydronic side and electric submetering on the boiler and pump loads. All of it lands in one dashboard rather than four — see Managed Intelligence.

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Steam Flow Meters for Saturated & Superheated Steam — FAQ

Common questions about this category.

How does a steam flow meter work?
Most industrial steam meters are vortex meters. A bluff body in the flow stream sheds vortices at a frequency proportional to flow velocity. Multivariable models add integrated pressure and temperature sensors, then compute steam density from those readings and output true mass flow in pounds per hour rather than velocity alone.
Why does steam metering require mass flow rather than volumetric flow?
Steam density changes significantly with pressure and temperature. The same volumetric flow rate can represent very different quantities of energy depending on operating conditions. Mass flow accounts for density, so it remains a valid basis for cost allocation and energy balance as conditions change.
What is the difference between metering saturated and superheated steam?
Saturated steam has a fixed pressure-temperature relationship, so density can be derived from pressure alone. Superheated steam does not, so density requires independent pressure and temperature measurement, which means a multivariable meter.
Can a steam meter be installed without shutting down the line?
Insertion-type meters can be installed through a hot tap on a live line by a qualified contractor. Inline meters require the line to be depressurized and broken.
Why is my steam meter reading zero at low flow?
Vortex meters have a minimum velocity below which vortex shedding does not occur and the meter cannot register flow. This is almost always caused by a line sized for peak or future load running at a fraction of that flow. The fix is a correctly sized meter, sometimes installed in a reduced-bore section.
What steam metering do energy codes require?
IECC 2024 C405.13.7 extends submetering requirements to non-electrical end uses, which can include steam depending on the building and jurisdiction. Our guide to non-electrical submetering requirements covers what the section asks for.

Related guidance

Selection guides, code-compliance reading, and field results for this product line.

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