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Flow Meter Dimensions Template: Flange-to-Flange Length Charts for Piping Design Planning
Quick Answer: Flange-to-flange length is the face-to-face dimension of an inline flow meter body. Use this template to compare typical lengths from DN15 to DN300 for electromagnetic, Coriolis, vortex, oval gear, and thermal mass flow meters. Send your pipe size (DN), flange rating (PN or Class), pressure (bar), temperature (°C), flow range (kg/h or m3/h), and viscosity (cP) to Silver Instruments for a dimensioned drawing.
Most engineers skip this part during early piping design. Then a flow meter arrives on site and the pipe gap is short by 40 mm. That creates a rework order, a delayed startup, and extra welding. We have seen this on customer sites in Vietnam, Indonesia, Mexico, and Saudi Arabia many times.
This article gives you a practical flange-to-flange length chart template. It covers standard face-to-face dimensions for common inline flow meters from DN15 to DN300. Use it before you order or cut pipe.
What Flange-to-Flange Length Means
Flange-to-flange length is the distance between the two raised faces of a flow meter body. Some suppliers call it face-to-face length or lay length. It does not include mating flanges, bolts, or gaskets. It only covers the meter body from one flange face to the other flange face.
In a piping plan, this dimension decides how much straight pipe you remove. It also decides whether the meter fits inside a skid, a pump station, or a batch line.
Why Piping Designers Need a Dimensions Template Early
Piping designers usually lock pipe routing before the instrument list is complete. Here is the thing. Flow meter dimensions vary by type, brand, and pressure rating. A DN50 electromagnetic flow meter from one supplier can be 200 mm long. A DN50 Coriolis mass flow meter can be 410 mm long. That 210 mm difference is enough to break a skid layout.
A simple dimensions template solves this. It lists the flow meter type, DN size, flange rating, pressure class, and flange-to-flange length. You can mark the reserved space on a P&ID or 3D model before finalizing pipe supports.
Typical Flange-to-Flange Length Chart by Meter Type
Use the following ranges as planning values. Confirm the exact drawing before you weld pipe supports.
Electromagnetic flow meter DN15 to DN50: 200 mm. Electromagnetic flow meter DN80 to DN100: 250 mm. Electromagnetic flow meter DN150: 300 mm. Electromagnetic flow meter DN200: 350 mm. Electromagnetic flow meter DN250: 450 mm. Electromagnetic flow meter DN300: 500 mm.
Coriolis mass flow meter DN15: 250 to 310 mm. DN25: 310 to 360 mm. DN40: 350 to 420 mm. DN50: 410 to 480 mm. DN80: 520 to 600 mm. DN100: 610 to 700 mm.
Vortex flow meter DN15 to DN50: 200 mm. DN80 to DN100: 250 mm. DN150: 300 mm. DN200: 350 mm. DN250: 400 mm. DN300: 450 mm.
Oval gear flow meter DN15: 150 to 170 mm. DN25: 170 to 190 mm. DN40: 190 to 220 mm. DN50: 220 to 260 mm. DN80: 260 to 320 mm. DN100: 320 to 400 mm.
Thermal mass flow meter inline DN15 to DN50: 180 to 240 mm. Insertion thermal mass meters do not use flange-to-flange length because they mount on a probe.
These numbers are approximate. Flange rating PN16, PN40, ASME 150 lb, 300 lb, and JIS 10K can change the body length. Always request an outline drawing.
Coriolis Flow Meter Dimensions for Tight Batch Lines
Coriolis meters give high accuracy for mass flow, density, and temperature. They also need more space than many engineers expect. A DN25 Coriolis meter with 150 lb flanges is often 310 mm long. A DN50 model can reach 480 mm. If you replace an old turbine meter, check the gap first.
A paint manufacturer in Vietnam contacted us last year. They had a DN40 resin line with ASME 150 lb flanges. The old oval gear meter was 210 mm. The new Coriolis meter standard length was 410 mm. We supplied a compact Silver Instruments SIL-CMF series mass flow meter with a 350 mm flange-to-flange length. That saved the pipe fitters from rebuilding two elbows.
Electromagnetic Flow Meter Dimensions for Water and Wastewater
Electromagnetic flow meters
For seawater desalination service, specify rubber lining and 316L electrodes. Silver Instruments supplies the SIL-MAG series for reverse osmosis feed lines, brine discharge, and chemical dosing. The SIL-MAG output includes 4-20 mA HART. Send your conductivity (µS/cm), pipe size (DN), and pressure (bar) to get a dimensioned PDF drawing.
Vortex and Oval Gear Flow Meter Dimensions for Utility Skids
Vortex flow meters work well for saturated steam, compressed air, and cooling water. They have repeatable face-to-face lengths. A DN80 vortex meter is usually 250 mm long. A DN100 vortex meter is also 250 mm in many designs. This makes piping layout simpler when you standardize on one brand.
Oval gear flow meters are even shorter. They fit diesel, fuel oil, and lubricant lines from DN15 to DN100. A DN25 oval gear meter is about 170 mm long. Use this type when the line has low flow and high viscosity up to 2000 cP.
How to Use the Dimensions Template Before Ordering
Record the pipe size and flange rating first. Then list the fluid, flow range, pressure, temperature, and viscosity. Compare the available straight section between the two pipe ends. Mark the flange-to-flange length from the vendor drawing. Add space for bolts and gaskets. Add the required upstream and downstream straight run after the meter.
Most engineers skip this part on paper. Then the site team finds that the meter body fits but the straight run does not. For a vortex meter, you often need 15D upstream and 5D downstream. For an electromagnetic meter, 5D upstream and 2D downstream is enough in most cases. For a Coriolis meter, the manufacturer may state no special straight run, but you still need room for zero verification and wiring.
FAQ: Five Questions Engineers Ask About Flow Meter Dimensions
What is flange-to-flange length?
It is the face-to-face distance across the flow meter body from one flange face to the other. It does not include the mating flanges or gaskets.
Does flange rating change the length?
Yes. PN16, PN40, ASME 150 lb, and 300 lb flanges can change the body thickness and overall length. Some manufacturers keep a common body length across ratings. Always confirm the outline drawing.
Which flow meter type has the shortest inline length?
Oval gear meters are usually the shortest. A DN25 oval gear meter can be 170 mm long. Thermal mass and electromagnetic meters also come in compact lengths.
Can you build a custom short-length flow meter for a skid?
In many cases yes. Silver Instruments can advise on compact flange-to-flange options for Coriolis, electromagnetic, and vortex meters. We need the pipe gap, flange rating, and process data before confirming.
How do I get a dimensioned drawing before purchase?
Send your pipe size (DN), flange rating (PN or Class), pressure (bar), temperature (°C), and flow range. We will return a PDF outline drawing with the exact flange-to-flange length and installation notes.
Contact Silver Instruments for a Dimensioned Flow Meter Drawing
Silver Automation Instruments supplies Coriolis mass flow meters, electromagnetic flow meters, ultrasonic flow meters, vortex flow meters, oval gear flow meters, thermal mass flow meters, pressure transmitters, and paperless recorders to industrial end users and distributors in oil and gas, water and wastewater, chemical, food and beverage, and marine industries across Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
Call us at +86-25-68650347 or WhatsApp +86-25-52155837. WeChat: +86 15365082610. Website: flow-meter.com.au or silverautomation.com.
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We will recommend a flow meter model and provide the flange-to-flange length chart for your piping design planning.
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