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Coriolis Flow Meter Symbol: Standard Process Engineering Schematic Legends
Quick Answer: A Coriolis flow meter is usually drawn on a P&ID as a circle on the process line with CM, CFM, FT, or FIT tag letters inside or next to the circle. Some legend sheets draw two small loops inside the circle to suggest the Coriolis measuring tubes. Always confirm the symbol against the project legend before you specify or purchase because ISA 5.1, ISO 14617, and plant standards are not identical.
Why the Symbol Changes From One P&ID Legend to Another
Process engineers do not work from a single global symbol set. A water treatment plant in Vietnam may use a simple circle with FT inside the circle. A chemical project in Saudi Arabia may use a circle with CMF and a tag number below. The legend sheet on the drawing set is the only reliable reference. We have seen many RFQs where the buyer sent only the tag number and line size. That works for a preliminary quote, but the symbol alone does not confirm the meter type unless the legend is clear.
When you search for Coriolis flow meter symbol standard process engineering schematic legends, you are usually looking at a specific drawing convention. The most common approach follows ISA 5.1 with a circle and instrument function letters. The flow element is often FE or FT. The transmitter is typically FT or FIT. For a Coriolis mass meter, the circle often contains CM, CMF, or CML. If the mass flow transmitter has a separate housing, the symbol may be split into two bubbles connected by a signal line on the P&ID. Because the legend sheet defines the exact meaning of a circle, we always ask for a small section of the P&ID when a customer is unsure.
Common P&ID Representations for Coriolis Flow Meters
In practice, there is no single mandatory icon for a Coriolis meter. Many legends use a circle with CM inside. Other drawings add two parallel loops across the pipe to represent the vibrating measuring tubes. A third style draws a circular flow element next to a square transmitter bubble with a dotted signal line between them. Here is the thing: what matters for procurement is not the drawing shape. The tag letters, the process range, the line size, and the output signal matter much more. Most engineers skip this part and later find that the installed meter does not match the control system.
Tag Letters You Should Read With the Symbol
On a P&ID, the circle is less important than the tag letters. A Coriolis meter used for mass flow and density may be tagged as FIT, FIQ, or FQ depending on the function. A mass flow control loop may show FCV. A Coriolis flow meter for custody transfer may carry a fiscal tag with a separate flow computer. If the symbol shows FT with a range of 0 to 5000 kg/h, a bidder needs that exact range. We ask customers before quoting a Coriolis meter for fluid, flow range, pressure, temperature, density, viscosity, line size, and hazardous area.
How the Symbol Connects to a Real Silver Instruments Meter
When a process designer places a Coriolis symbol on the P&ID, the next step is a specification. Silver Automation Instruments supplies Coriolis mass flow meters that match common tag requirements. Line sizes run from DN15 to DN300. Mass flow accuracy can reach ±0.1 percent of rate under normal process conditions. Density measurement is standard on most models. Output options include 4-20 mA HART, RS485 Mod
Where P&ID Symbols Cause Ordering Mistakes
We have seen an order mistake at a dairy plant in Australia where the legend marked a Coriolis flow meter as FQ, but the buyer quoted a standard electromagnetic meter because he only read the line size and ignored the mass flow requirement. Another project in Mexico used two loops inside the circle and the supplier did not recognize it. The replacement meter could not measure density. That changed the batching accuracy for a food additive process. A lubricant blending site in Nigeria had a similar issue when the legend sheet was not updated after a revamp.
A marine fuel transfer skid in Singapore avoided the problem because the EPC sent the legend sheet with the quote request. Do not skip the legend sheet. The symbol is there to protect the process design.
What to Send Us for a P&ID Based Quote
Send us your pressure in bar, temperature in °C, pipe size DN, and flow range kg/h. Add fluid name, density if known, viscosity in cP, and the hazardous area zone. If you have a P&ID snippet, attach it. We can read the symbol and tag letters and return a quote with a matching Coriolis mass flow meter from Silver Instruments.
FAQ: Coriolis Flow Meter Symbol and Schematic Legends
What does a Coriolis flow meter symbol look like on a P&ID?
The symbol is usually a circle on the pipe with CM, CFM, FT, or FIT letters. Some drawings add two loops inside the circle. The legend sheet defines the exact style for that project.
Is there an international standard for the Coriolis flow meter symbol?
ISA 5.1 and ISO 14617 provide general function symbols, but they do not always show a unique Coriolis tube shape. Many engineering contractors add their own variation. Always match the project legend sheet and the tag number.
Can I order a Coriolis meter from the P&ID tag alone?
You can get a preliminary quote from the tag and line size, but you need the process data. The tag tells function and location. It does not tell viscosity, pressure, temperature, or flow range. Send us the tag plus the process values mentioned above.
Why do some legends show two circles for one Coriolis meter?
Some drawings separate the flow element from the transmitter. One circle is the sensor body. The other bubble is the transmitter with 4-20 mA HART output. The dotted signal line connects them. This is common when the sensor is in a high temperature or high vibration area.
Does Silver Instruments provide drawings or symbols for P&ID use?
Yes. Silver Instruments can provide dimensional drawings and wiring notes for our Coriolis flow meters. Many EPC contractors use these drawings to finalize their P&ID legend and layout. Send the tag number, line size, and fluid details.
Contact Silver Automation Instruments
For a Coriolis flow meter quote, send flow range, pressure, temperature, pipe size, and fluid. We respond to industrial users, EPC contractors, and distributors in Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
Tel: +86-25-68650347
WhatsApp: +86-25-52155837
WeChat: +86 15365082610
Website: flow-meter.com.au
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