Rosemount 3051SFC Compact Orifice Flow Meter

Rosemount 3051SFC compact orifice flow meter between existing flanges

The Rosemount 3051SFC is a compact differential pressure flow meter: a 316 stainless steel orifice plate or conditioning orifice plate, a manifold head and a Rosemount 3051S transmitter delivered as one fully configured, leak-tested unit. It fits between two raised-face flanges, so it can often replace an old orifice run without cutting pipe. Line sizes run from 1/2 in. (15 mm) to 12 in. (300 mm), and the meter reports compensated mass flow directly when a measurement type with flow calculation is selected.

Seven Star LLC supplies Rosemount flow instrumentation in Oman and the GCC as an independent supplier in Muscat. This page explains the 3051SFC code structure, its performance by plate type, and what to prepare for a quotation.

Reading a 3051SFC model code

The manufacturer gives a typical code, 3051SFC 1 C S 060 N 065 T 3 2 J A 1A 3. Reading it in order against the ordering tables gives the following.

3051SFC technical specifications

Ultra for Flow performance (code 3) is only available with DP ranges 2 and 3 and silicone fill fluid. Range 1 meters carry an extra uncertainty of up to 0.9 %, so confirm the range with the sizing tool.

Why the 3051SFC conditioning orifice shortens the piping

A conventional orifice plate needs long, undisturbed pipe on both sides. The conditioning plate shapes the velocity profile before the measurement, which is why the manufacturer states two diameters upstream and two downstream for most disturbances, and a discharge coefficient uncertainty as low as 0.5 percent. The plain orifice version follows the usual flow-through-a-single-bore principle for cases where piping is already long and clean.

Both versions measure the pressure drop across the plate with the 3051S module. Measurement types 1 to 4 carry the flow calculation inside the transmitter, so there is no separate flow computer on the loop. Types 5 to 7 give process variables only, and type D gives differential pressure.

3051SFC selection and ordering checklist

• Fluid and phase: liquid, gas or steam, with density, viscosity and operating conditions.
• Flow range and the beta ratio chosen from the sizing tool, so the plate is made for your minimum and maximum flows.
• Line size and flange standard; 10 in. and 12 in. meters require an alignment ring (ANSI Class 150, 300, 600, DIN PN16, 40, 100 or JIS).
• Plate type: conditioning orifice or orifice plate; conditioning orifice flow calibration of 3 or 10 points is optional.
• Temperature element: integral RTD, remote thermowell or none; needed for measurement types 1, 3, 5 and 7.
• Direct or remote transmitter mounting, DP range, static pressure range and output protocol.
• Housing, approvals, NACE compliance, hydrostatic test and inspection certificates.

Installing the 3051SFC between flanges

The meter is clamped between two raised-face flanges with customer-supplied studs, nuts and gaskets. The manufacturer recommends Durlon 8500 fibre gaskets and advises replacing gaskets and O-rings whenever the primary element is taken apart. Studs and nuts are available as spare parts. Ensure the plate is concentric with the pipe, which the alignment ring helps with on large sizes.

For vibration, the manufacturer notes performance of better than ±0.1 percent of URL when tested per IEC 60770-1, but the weight and length limits of the transmitter assembly must be respected. A 3-valve manifold supports zero checks in service, and a graphite valve packing option exists for high-temperature use up to 850 °F.

Related 3051SF meters and the Rosemount 405 element

The Rosemount 405 is the stand-alone compact primary element described in the same product data sheet. In the 3051SF family the neighbours are the 3051SFA for large lines, where an Annubar averaging pitot is more economical, and the 3051SFP for lines of 1/2, 1 and 1-1/2 in. with a precision honed pipe section. The 3051SFC fills the middle range of line sizes in a flanged installation.

3051SFC applications in Oman and the GCC

Typical duties are fuel gas and instrument air headers, boiler feedwater and steam lines in power plants, chemical dosing and cooling water in desalination, and process gas or condensate in oil and gas facilities. The compact form is attractive on busy pipe racks where long upstream runs are impossible. Heat in the Gulf summer is handled by checking process temperature against the 450 °F direct-mount limit and using remote mount if the transmitter would see high radiant heat.

Information to send with a 3051SFC RFQ

• Sizing sheet or line data: fluid, pressure, temperature, flow range and pipe schedule.
• Plate type, beta ratio and measurement type.
• Flange standard and class, and alignment ring needs for 10 and 12 in.
• Transmitter connection, ranges, output, housing and approvals.
• Calibration or certificates required, quantity and delivery site.

Documents and quotation

The manufacturer product data sheet for the Rosemount DP flow meters and primary elements is attached on this page. It covers the 3051SFC ordering tables, accuracy by plate type and temperature limits.

To request a quotation, send the model code or the process data. Seven Star LLC will review the configuration and reply with availability for Oman and the GCC.