Faure Herman TZN Calibrated Nozzle 301227 – For TZN25-2 Turbine Flowmeter

Overview

The Faure Herman TZN Calibrated Nozzle 301227 is a precision inlet flow-conditioning component for the Heliflu-TZN helical turbine flowmeter, engineered to deliver evenly conditioned flow into the meter’s measurement chamber for accurate, repeatable custody-transfer-grade measurement. It is used by oil and gas metering engineers across Oman and the GCC on liquid hydrocarbon custody transfer, allocation, and process metering skids where the Heliflu-TZN turbine meter is installed.

Turbine flowmeters are sensitive to inlet flow profile disturbances, and a calibrated nozzle upstream of the turbine rotor straightens and conditions the flow before it reaches the measurement element, which is essential to achieving the Heliflu-TZN’s rated custody-transfer accuracy rather than the degraded performance a disturbed flow profile would otherwise produce.

Operating Principle

The Heliflu-TZN turbine flowmeter measures flow by counting the rotations of a helical rotor turning in proportion to fluid velocity through the meter body. Flow conditioning components such as the calibrated nozzle ensure the velocity profile presented to the rotor is symmetric and fully developed, directly supporting the meter’s rated linearity of ±0.15% for custody-transfer applications (±0.10% for premium/master metering) and repeatability better than 0.04% (0.02% for premium applications).

Engineering Design of the Faure Herman TZN Nozzle

The TZN-series meter family this nozzle serves is built for a flow range of 0.12 to 9,300 m³/h (0.75 to 58,500 bbl/h), with internal wetted components in 316L stainless steel (titanium optional) and rotors in titanium or aluminum running on tungsten carbide or graphite bearings, materials selected for corrosion resistance and dimensional stability in hydrocarbon service. The broader TZN meter system is rated for process temperatures from −50°C to +180°C (ATEX/IECEx) or −50°C to +150°C (UL/cUL), across meter sizes ½” to 20″ and flange ratings from ANSI 150 to ANSI 2500, giving the flow-conditioning nozzle a correspondingly wide range of pressure and temperature service.

Key Features

• Precision inlet flow conditioning for Heliflu-TZN turbine meters
• Supports custody-transfer linearity of ±0.15% and repeatability <0.04%
• 316L stainless steel internals (titanium optional)
• Compatible with TZN meter flow range 0.12-9,300 m³/h (0.75-58,500 bbl/h)
• Process temperature range −50°C to +180°C (ATEX/IECEx rated)
• Supports ANSI 150-2500 flange rating meters, ½”-20″ sizes

Industrial Applications

Across Muscat, Sohar, and Salalah, the TZN calibrated nozzle is used in liquid hydrocarbon custody-transfer and fiscal metering skids at export terminals, refineries, and gas-processing facilities, where accurate volumetric measurement directly affects commercial settlement between parties. Its role in conditioning flow ahead of the turbine rotor makes it an essential replacement or spare component for any Heliflu-TZN metering installation, since a worn or missing flow conditioner degrades the meter’s certified accuracy.

The nozzle and its parent meter system are also used in allocation and process metering applications across the region’s oil and gas sector, wherever a Heliflu-TZN turbine meter is already installed and periodic maintenance or component replacement is required.

Technical Specifications

Request a Quote for Faure Herman TZN Calibrated Nozzle 301227 – For TZN25-2 Turbine Flowmeter

Seven Star LLC supplies the Faure Herman TZN calibrated nozzle and complete Heliflu-TZN turbine flowmeter systems as an experienced supply partner to oil and gas metering operators across Oman and the GCC. Contact our engineering team for a formal quotation and technical support for your custody-transfer metering skid.

How to Identify the Correct TZN Nozzle Spare

Before ordering a replacement nozzle, confirm the meter it is going into. The Heliflu-TZN family covers several line sizes, and internal flow-conditioning parts are matched to a specific meter body, so the key reference is the meter model and serial number on the Faure Herman nameplate rather than the nozzle alone. When you request part 301227, include:

• The complete meter model code (for example TZN25-2) and serial number from the body nameplate
• Any part number stamped or etched on the existing nozzle
• The meter calibration certificate or K-factor sheet, if available
• Product metered, typical flow range and operating temperature

Matching these details against the manufacturer’s records avoids fitting a component intended for a different meter size or revision.

Installation and Re-Commissioning

Replacing an internal nozzle changes the flow path the rotor sees, so the meter should be treated as a repaired instrument, not simply reassembled. Recommended practice is:

• Isolate, depressurize and drain the meter run, and follow site permit-to-work procedures for hydrocarbon service
• Inspect the rotor, bearings and internal bore for erosion, deposits or damage while the meter is open
• Fit the nozzle in the correct orientation and replace any seals or gaskets disturbed during disassembly
• Check the upstream straight run and flow conditioner are clean and unchanged
• Re-prove the meter against the site prover or a master meter and update the K-factor in the flow computer

For custody-transfer meters, the re-proving and documentation should satisfy the requirements of the metering contract and any witnessing party before the meter returns to fiscal service.

Maintenance and Troubleshooting

A worn, fouled or damaged nozzle usually shows up in proving data before anything else. Signs worth investigating include a K-factor that drifts steadily between proves, poor repeatability across consecutive prove runs, or a meter factor that shifts with flow rate more than it did when new. Wax, scale or debris carried from upstream strainers can also build up on conditioning surfaces. Trending meter factors over time, keeping strainers maintained and inspecting internals during planned shutdowns are the most effective ways to catch these problems early.

Applications in Oman and the GCC

Helical turbine meters of this type are common on crude oil export and allocation skids, refined product loading, pipeline transfer and terminal metering systems throughout Oman, the UAE, Saudi Arabia and Kuwait. Keeping a genuine nozzle on hand as a critical spare shortens downtime when a meter fails its prove or is opened during a turnaround.

Sourcing Through Seven Star LLC

Send the meter nameplate details and part number to Seven Star LLC for a quotation on genuine Faure Herman spares. We can include available documentation with the supply and coordinate delivery to sites across Oman and the GCC.

Browse the full Faure Herman range or see more Flowmeters products supplied by Seven Star LLC in Oman and the GCC.