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Flow Meter Size Chart Template: Flange-to-Flange Dimensions for Standard Piping Network Planning
Quick Answer: A flow meter size chart template should include pipe size, flange standard, pressure rating, and flange-to-flange length for each meter type. Standard face-to-face dimensions follow ISO, ASME, DIN, and JIS patterns. Use this chart before pipe fabrication to avoid spool rework and installation shutdowns.
Why Flange-to-Flange Dimensions Matter in Piping Layout
For any inline flow meter, the flange-to-flange dimension is the distance between the two mating flange faces. If the dimension is wrong, the pipe crew has to cut the line, add a spool, or force the pipe into alignment. Forced alignment puts stress on the meter body and can damage the liner or sensor.
We have seen this on customer sites many times. A water treatment plant in Malaysia ordered a DN100 electromagnetic flow meter but the existing pipe gap was sized for a wafer style unit. The flanged meter was longer, and the crew had to modify the pipe rack on site. That added two days of downtime.
In practice, standard piping network planning starts with a meter schedule. The schedule lists line number, fluid, pipe size, pressure rating, flange standard, and lay length. Lay length is another term for flange-to-flange dimension. Most engineers skip the dimension during first layout, then deal with fit-up problems later.
Standard Face-to-Face Lengths by Flow Meter Type
Different flow meter types have different face-to-face lengths. Electromagnetic flow meters usually follow ISO 13359 or the manufacturer standard. Coriolis mass flow meters are shorter but heavier because of the vibrating tubes. Vortex flow meters follow the flange body pattern and stay compact. Oval gear flow meters are the most compact in DN15 to DN50 lines. Thermal mass flow meters often use insertion probes, so inline flange-to-flange length does not apply in those cases.
Here is a sample set of common flange-to-flange values for planning. Actual dimensions depend on pressure rating and flange standard.
| Nominal size | Electromagnetic flanged | Coriolis inline | Vortex flanged | Oval gear |
|---|---|---|---|---|
| DN15 | 150 mm to 200 mm | 200 mm to 300 mm | 150 mm to 200 mm | 100 mm to 150 mm |
| DN25 | 150 mm to 200 mm | 250 mm to 350 mm | 150 mm to 200 mm | 150 mm to 180 mm |
| DN50 | 200 mm | 300 mm to 400 mm | 200 mm | 180 mm to 200 mm |
| DN80 | 200 mm to 250 mm | 350 mm to 450 mm | 200 mm to 250 mm | 200 mm to 250 mm |
| DN100 | 250 mm | 400 mm to 500 mm | 250 mm to 300 mm | 250 mm to 300 mm |
| DN150 | 300 mm | 500 mm to 600 mm | 300 mm to 350 mm | 300 mm to 350 mm |
Values above are sample planning data. A PN16 meter can be 10 mm to 20 mm longer than a PN10 meter in some sizes. A JIS 10K flanged meter can have a different face-to-face length than an ASME 150 flanged meter. Always request the dimensioned outline drawing before final pipe spool fabrication.
Flow Meter Size Chart Template for Piping Network Planning
Use this template to build your own meter schedule. Populate one row for each flow meter during P&ID development.
| Line tag | Pipe size | Flange standard | Rating | Meter type | Flange-to-flange length | Notes |
|---|---|---|---|---|---|---|
| 12-PW-001 | DN80 | ASME B16.5 | 150 lb | Electromagnetic | 250 mm | Wastewater line |
| 12-CW-002 | DN50 | DIN PN16 | PN16 | Oval gear | 200 mm | Diesel batch line |
| 12-GS-003 | DN150 | ASME B16.5 | 300 lb | Vortex | 350 mm | Steam line |
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If your site uses a mix of DIN, ASME, and JIS flanges, keep the standard in the schedule. The same nominal size does not mean the same bolt circle or the same face-to-face length. A DN50 PN16 meter may not fit a DN50 ASME 150 pipe gap without an adapter flange.
How Flange Rating Changes the Dimension
Flange rating affects the flange thickness and the raised face height. A PN16 meter can be 10 mm to 20 mm longer than a PN10 meter in some sizes. A 300 lb flanged meter is heavier than a 150 lb meter with the same nominal size. The face-to-face length may stay similar, but the bolting and gasket space changes. So the pipe rack position may need adjustment even if the meter length is the same.
Installation Example from a Desalination Plant
Last year a customer in Vietnam asked us for a seawater flow meter for a desalination plant. The pipe was DN150, pressure 10 bar, temperature 25 °C. The existing pipe gap was 300 mm. We recommended a flanged electromagnetic flow meter with a flange-to-flange length of 300 mm and 4-20 mA HART output. The meter fit without cutting or spool work. That saved about one day of shutdown time.
For seawater lines, a rubber-lined electromagnetic flow meter from Silver Instruments works well. The flange-to-flange dimension should match the pipe gap before you order. Send us the pipe class and the exact gap, and we will check the drawing before production.
Get the Right Size Chart for Your Piping Network
Send us your pipe size (DN), pressure (bar), temperature (°C), flow range, and flange standard. Silver Automation Instruments will send you a flange-to-flange drawing and a quote for the correct meter type. Call +86-25-68650347 or WhatsApp +86-25-52155837. Use WeChat +86 15365082610 if that is easier.
FAQ
What is flange-to-flange length on a flow meter?
It is the distance between the two raised faces of the mating flanges on the meter body. This dimension controls the pipe gap needed for installation.
Which standard should I use for flange-to-flange dimensions?
Use the same standard as your pipe class. Common options are ASME B16.5, DIN EN 1092-1, JIS B2220, and ISO 13359 for electromagnetic flow meters.
Do insertion flow meters need a flange-to-flange dimension?
Most insertion thermal mass flow meters do not. They mount through a ball valve or a weld boss. Inline flow meters need the dimension.
Can Silver Instruments supply a custom face-to-face length?
Yes in many cases. For small and medium sizes we can adjust the end connections or use extension bodies. Send us the required length and the pipe pressure.
How do I get a size chart for my pipe class?
Send us your line list or pipe class document. We will mark each meter with the correct flange-to-flange length and model recommendation.
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