|
 Accuracy
Within the specified pipe Reynolds number range and a normalized
piping configuration, the Lo-Loss® flow meter provides flow
measurement uncertainties of:
± 1.00% for standard meters and
± 0.25% for flow calibrated meters.
Pressure Loss
The permanent pressure loss of the Lo-Loss® meter expressed
as a percentage of the differential produced is shown in Figure
1 and is the lowest of any differential-producing primary element.
Beta Ratio
Wyatt Engineering offers Lo-Loss® meters with a wider range
of diameter ratios (d/D) than any other manufacturer. By custom
designing a Lo-Loss® meter to your application’s flow conditions,
Wyatt can provide an accurate and reliable primary element
with the lowest permanent pressure loss.
Temperature Range
Cast iron Lo-Loss® meters can handle process temp-eratures
between -20 °F and +350 °F (-30 °C and +175 °C).
Pressure Range/End Connections
Flanged end connections, per ANSI B16.1 for 125 PSIG and 250
PSIG service, are available. Various other end connections are also
available, including: Mechanical joint flanges, per AWWA C110 and
C111, and plain-end designs.
Piping Requirements
Designed for full-pipe flow, Lo-Loss® flow meters can be
mounted horizontally, vertically, or on an angle. Refer to Wyatt
Engineering Technical Manual for the Lo-Loss® Meter for recommended
upstream piping.
Annual Pumping Cost Savings
Comparison of Differential Producers |
| |
 |
| Lo-Loss
® vs. Orifice Plate |
$1704 |
| |
|
| Lo-Loss
® vs. Flow Nozzle |
$1544 |
| |
|
|
| Lo-Loss
® vs. Short-Form Venturi |
$327 |
| |
|
| Lo-Loss
® vs. Long-Form Venturi |
$52 |
| |
|
|
| Figure 2 |
Energy Considerations
Figure 1 compares the permanent pressure loss of the insert
Lo-Loss® design with that of other primary flow elements. Figure
2 illustrates the substantial savings that are realized when a Lo-
Loss® meter is used in a typical application. The pressure
recovery of the Wyatt Lo-Loss® Meter means reduced pumping
costs. High beta ratio Lo-Loss® meters will recover up to 97.5%
of the differential pressure produced. This is two to four times
better than typical classical venturi devices, as well as most modified
venturi meters.
Using venturi tubes instead of orifice plates can yield significant
savings, and using the Lo-Loss® meter instead of venturi tubes
can realize further savings. For over 40 years, engineers have given
their clients the benefits of efficiency and accuracy by doing just
that.
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