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Axial Flow Meter: Sourcing Inline High-Velocity Turbine Spool Pieces
Quick Answer: For inline high velocity turbine measurement, specify the spool piece bore, end connection, pressure rating, and flow range before requesting price. Silver Automation Instruments supplies axial flow meter spool pieces in DN15 to DN300 with pulse or 4-20 mA HART output and optional ATEX Zone 1 certification. Send your pipe size in DN, flow range in m3/h, pressure in bar, and temperature in °C to get a quote within 24 hours.
What an Axial Flow Meter Spool Piece Actually Is
An axial flow meter spool piece is a short pipe section with a turbine rotor mounted inline. The rotor spins as fluid passes along the pipe axis. A magnetic pickup or RF sensor counts each blade pass. The meter converts that frequency into flow rate and total volume. Inline means the body matches the pipe diameter and sits between two flanges. High velocity means the design is built for clean fluids moving faster than typical process lines, often above 5 m/s.
Most engineers skip the term spool piece and just say turbine meter. But the spool piece matters. It sets the straight run requirements and keeps the rotor centered. For high velocity applications, a loose rotor or a badly aligned spool piece leads to bearing wear and signal drop.
Where These Meters Fit
We see these meters in fuel transfer skids, hydraulic test benches, water injection lines, and terminal loading. A gas distributor in Nigeria ordered a DN80 axial turbine spool piece for LPG transfer at 18 bar. A pump test facility in Vietnam used a DN50 inline turbine meter to measure water flow at 45 m3/h. Both needed a meter body that could handle sustained velocity without a separate flow conditioner.
In Australia and New Zealand, mining service companies use axial turbine spool pieces on diesel and process water lines. Because the meter is inline, the whole flow passes through the rotor. That gives better repeatability than clamp on or insertion meters when flow is steady and clean.
Sizing Data That Determines Price
Price depends on bore size, end connection, wetted material, and certification. DN15 to DN50 meters cost less. DN80 to DN150 cost more because the body, flanges, and rotor are larger. DN200 to DN300 are built to order. ANSI 150, ANSI 300, PN16, PN40, tri clamp, or threaded ends change machining cost. 304 stainless steel is standard. 316 stainless steel, duplex, or PTFE lined bodies raise the price. ATEX Zone 1 or IECEx adds documentation and testing cost, usually 15 to 25 percent.
Flow range is not just a number. For a DN50 inline turbine meter, a typical range might be 2 to 40 m3/h for water. For light oil at 10 cP, the minimum flow goes up. Tell us the normal flow, maximum flow, and minimum flow. Do not send only the pipe size. Pipe size alone is not enough to select the rotor and pickup.
Output Signals and Integration
Most axial flow meter spool pieces from Silver Automation Instruments ship with a pulse output. The pulse frequency is proportional to flow. You can connect the pulse output directly to a PLC counter or batch controller. For 4-20 mA output, we add a converter or preamplifier. HART is available on the converter version. Modbus RTU is possible through an external display or flow computer.
In practice, we recommend pulse output for totalizing and 4-20 mA HART for rate monitoring and diagnostics. If your site already has a flow computer with turbine input, pulse is simpler and cheaper. If you need remote reading, choose the converter with HART.
Installation Notes
Inline high velocity turbine meters need straight pipe. For a standard axial turbine, allow 10D upstream and 5D downstream. If you have a control valve, elbow, or pump
The meter must be full of liquid. No air pockets. A chemical plant in Malaysia had an axial turbine meter on a solvent line. Air entrainment after a filter caused intermittent signal loss. The fix was a simple air release valve, not a new meter.
Standards and Certification
We offer wafer, flanged, and threaded spool pieces. Flanged meters are common for high velocity hydrocarbon and water lines. Standard pressure ratings are PN16, PN40, ANSI 150, and ANSI 300. Standard temperature range is -20 to 120 °C. If you need ATEX Zone 1 for a fuel terminal in the Middle East, state it in the inquiry. Certification adds lead time and documentation.
Price and Lead Time
For a standard inline axial turbine spool piece in 304 stainless steel with pulse output, prices start around 480 USD for small sizes. A DN80 flanged meter with 4-20 mA HART may land between 900 and 1400 USD. Lead time is usually 7 to 15 days for standard models and 20 to 35 days for custom materials or hazardous area certification.
We do not publish a fixed price list because the configuration changes cost too much. A paint manufacturer in Southeast Asia asked for a DN25 axial turbine meter for solvent at 0.8 cP. The standard rotor worked. The same size for a 50 cP resin line needed a different bearing. Send your fluid name, viscosity in cP, flow range in m3/h, and connection type to get an exact quote.
Sourcing From Silver Automation Instruments
Silver Automation Instruments is based in Nanjing, China, and supplies flow meters and process instruments to end users and distributors in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. We also supply electromagnetic flow meters, oval gear flow meters, Coriolis mass flow meters, ultrasonic flow meters, and vortex flow meters. You can source multiple instrument types from one supplier without mixing brands and documentation.
For quotes, send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. You can reach us by phone at +86-135-1213-1526, by WhatsApp at 86-135-12131526, or by WeChat at +86 13512131526. Visit flow-meter.com.au for product details. We respond within 24 hours on working days.
FAQ
What is the difference between an axial turbine flow meter and an insertion turbine meter?
An axial turbine meter has a rotor mounted inline so the full pipe flow passes through the meter. An insertion turbine meter only samples a point in the pipe. The inline spool piece gives better repeatability for clean, high velocity flows.
Can an axial flow meter spool piece handle water with small particles?
Not well. Abrasive particles wear the rotor bearing and change the meter factor. Use a strainer or choose an electromagnetic flow meter for dirty water.
What is the maximum viscosity for an inline turbine meter?
Most standard axial turbine meters work up to 20 cP. Above that, the flow range narrows. For heavy oils, an oval gear flow meter or Coriolis mass flow meter is a better fit.
Do you supply ATEX certified axial flow meter spool pieces?
Yes. We supply ATEX Zone 1 and Zone 2 versions with the correct documentation. Specify the gas group and temperature class in your request.
What information do you need for a quote?
Send the fluid name, viscosity in cP, normal and maximum flow rate in m3/h, pressure in bar, temperature in °C, pipe size in DN, end connection standard, and hazardous area requirement.
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