Hoffer Engineering Guide for Liquids
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Hoffer Engineering Guide for Liquids Accurate, Versatile, Economical...

Illustration 1 ● Turbine Flowmeter Cutaway Hoffer inline turbine flowmeters are velocity measuring devices, which is Pickup Coil to say they measure the average velocity of a fluid flowing through Riser the body of the meter. See Illustration 1 for details on the Flow construction of the Hoffer inline Straightener Flowmeter turbine flowmeter. Mounted within Housing the body of a Hoffer liquid turbine flowmeter is a vaned rotor. The rotor is centered on a shaft and allowed to rotate by means of bearings. The shaft is supported in Deflector Cones the housing by tube bundles that also provide...

MCP not recommended in 4” and larger sizes NOTE: Performance enhancement techniques are routinely applied to produce larger linear and usable flow ranges. Consult with the applications group at Hoffer with your requirements. for-trade, a flow straightening tube bundle in the upstream section is normally required to eliminate any rotation of the flow stream about its axis of flow. Hoffer offers a complete line of installation kits and flanged flow straightening sections that provide the required straight runs of piping in and out of the flowmeters as an option and meet API and AGA design...

Figure 3 ● Pressure Drop Characteristics for HO Series on Liquid Service P(e) = equilibrium vapor pressure of the liquid at the operating temperature in PSIA Pressure Drop: See Figure 3 for pressure drop across the meters and the side-bar note for calculating pressure drop at viscosities other than 1 cstk. Materials of Construction: The materials of construction selection for a turbine meter usually are based upon chemical compatibility between the flowing liquid and wetted components of the meter. In the case of Hoffer turbine flowmeters, the wetted components include the meter body and...

Table 4 ● Bearing Selection Hybrid Ceramic Ball Bearing Hard Carbon Composite Sleeve Tungsten Carbide Sleeve Use in “3A” Sanitary Series? Use in Dirty/Abrasive Service? Temperature Range: Requires Lubricating Liquid? General Corrosion Resistance: Extended Flow Range Service? Fair-Lubricity Dependent Fair-Lubricity Dependent Note: Temperature range of meter will also be limited by coil temperature range. See Table 8 on page 6. Bearing Selection: A specific bearing type is selected first on chemical compatibility with the flowing liquid. Other considerations include lubricity of the liquid,...

Table 7 ● Flanged Series Maximum Allowable Working Pressure Ratings Meter Size Flange Size Maximum ANSI Class Flange (See Note 2) Max. Allowable Working Pressure (See Note 2) Note 1: Flange size must match meter size. Note 2: Maximum allowable flange class & pressure rating are specific to the flange material selected. Consult factory for details. The most popular threaded type end connections for Hoffer inline turbine flowmeters are the male NPT type and the male 37° flared MS type. Hoffer can readily supply other thread forms including BSP, JIS, SAE and metric to name a few. The most...

Figure 4 ● Viscosity Effects on 1" Flow- Viscosity Recommendation Nominal Meter Size 1/4" - 12" Max. Recommended Viscosity 300 Cstks. * * Subject to operating pressure and pressure drop across the meter. use of a flow computer with a quadrature discriminator circuit it is then possible to determine direction of flow. A dual coil arrangement may also be specified for applications requiring pulse security; a technique common to certain custody transfer and legal-for-trade flow measurement applications. A third coil may also be added for use as a spare coil or for ease of connection to a flow...

Corporate History Hoffer Flow Controls brings over 30 years of experience designing and manufacturing quality turbine flowmeters and related process measurement and control instrumentation. Our initial experience was in the field of cryogenic flow measurement. Today our reputation in this field is synonymous with quality. Tens of thousands of Hoffer turbine flowmeters are on the job today throughout the world in applications ranging from oil well fracturing to food processing. Providing turbine flowmeters of varying configurations is our specialty. Our broad line of state-of the art...