Rosemount 3051SFP Integral Orifice Flow Meter

Rosemount 3051SFP integral orifice flow meter for 1/2 to 1-1/2 in. lines

The Rosemount 3051SFP is a factory-assembled flow meter for small pipes: a precision honed pipe section with a self-centering orifice plate, a manifold and a Rosemount 3051S transmitter. In lines of 1/2, 1 and 1-1/2 in. (15, 25 and 40 mm), an ordinary orifice plate is easily misaligned, and the error grows as the bore gets smaller. The 3051SFP removes that installation error by building the plate into the meter run, and it reports compensated mass flow directly when a flow calculation measurement type is chosen.

Seven Star LLC supplies Rosemount instruments in Oman and the GCC as an independent supplier in Muscat. Small-bore meters have more ordering options than most buyers expect, particularly bore size, so the sections below explain each step.

How a 3051SFP model code is read

The manufacturer shows 3051SFP 1 F 010 W3 S 0150 D3 1 J A 1A 3 M5 as a typical code. Reading it from left to right:

In the manufacturer table, Ultra for Flow is only available with DP ranges 2 and 3 and silicone fill. The sample code shows range 1 as a decoding exercise, so always confirm a real configuration with the sizing tool.

3051SFP technical specifications

Bore size and accuracy on the 3051SFP

The bore code is four digits and is the diameter in thousandths of an inch. For a 1/2 in. pipe the stocked bores run from 0.066 to 0.340 in., with 0.010, 0.014, 0.020 and 0.034 in. as non-starred options. A 1 in. pipe takes 0.150 to 0.800 in. and a 1-1/2 in. pipe takes 0.295 to 1.184 in. The sizing tool chooses the bore from your flow, pressure and temperature.

The accuracy bands above show why the choice matters: the best figure comes from bores between 0.500 and 1.000 in., while very small bores carry the largest uncertainty. The 1/2 in. quadrant-edge plates cover the smallest bores. A 3051SFP is most useful when the line is small and a decent percentage-of-reading accuracy is needed without long straight pipe.

3051SFP selection and ordering checklist

• Line size, schedule and pipe end style: threaded, socket weld, beveled or flanged with class and face.
• Fluid, operating pressure, temperature and flow range so the bore is sized correctly.
• Plate material for corrosion and NACE needs, and whether an RTD thermowell is wanted.
• Direct or remote mount, and a 3-valve or 5-valve manifold in SST or Alloy C-276.
• Measurement type, DP range, static pressure range, output and housing.
• High-temperature bolting (option G) if process temperature goes above standard limits.
• Hydrostatic test, material traceability, PMI and inspection certificates for project documents.

Installing and maintaining the 3051SFP

The 3051SFP arrives fully assembled, configured and leak tested, so site work is the pipe connection and the electrical hookup. Weld-neck or threaded ends tie into the line like a short spool. Support the transmitter weight, keeping the assembly within the structural weight limit, and use a bracket for remote mount. After a repair, replace the gaskets and O-rings of the primary element whenever it is disassembled.

Check manifold valves, impulse connections and zero during shutdowns. Because the plate is built into the body, ask us about spare gasket and O-ring sets when you order. Keep the factory configuration data sheet and the sizing report with the plant files.

3051SFP and the Rosemount 1195 integral orifice element

The Rosemount 1195 is the same integral orifice primary element sold without the full flow meter, and it can be ordered assembled to a transmitter. The 3051SFP adds the 3051S transmitter with MultiVariable flow calculation as a single unit. For larger lines, the 3051SFC compact orifice and the 3051SFA Annubar are the other 3051SF choices.

3051SFP applications in Oman and the GCC

Small lines carry chemical injection, fuel gas to burners, steam to tracing, sample conditioning loops and utility air in refineries, gas plants and power stations. Dosing lines in desalination plants also fall in the 1/2 to 1-1/2 in. range. Direct flow measurement in these lines can save the cost of orifice flanges, a separate flow computer and long pipe runs.

For outdoor installations in Gulf summer sun, choose a stainless steel Plantweb housing, shade the unit when possible, and use remote mount where the line is hot enough to push the transmitter toward its limits.

Information to send with a 3051SFP RFQ

• Fluid, flow range, pressure and temperature, and line size with pipe schedule.
• Pipe end connection type, flange standard, class and facing.
• Plate material, bore size if already sized, or the process data for sizing.
• Transmitter ranges, output, housing, display and hazardous-area approval.
• Test 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 includes the 3051SFP ordering tables, bore list and temperature limits.

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