Oil Industry Flowmeters
Low Viscosity Fluid Meters - Wide Rangeability
Pelton Wheel Flowmeters - available for high pressures
Meters illustrated are Lloyd's Register certified to ASME B31.3
? Design Pressure 1034 barg / 50°C
Lower pressure rating types are also available |
Long Service History
Litre Meter Ltd was incorporated in 1975 to manufacture Pelton Wheel Flowmeters patented by its founder. Original meters are still in service illustrating their inherent reliability and long life. The principles of operation of the LM and MM Series for flowrates 0.004 to 22,000 l/min are illustrated elsewhere.
Performance and Design
The Pelton Wheel Flowmeter is ideal for low-viscosity fluids such as wash water, methanol, biocide solutions etc. The meter offers very wide rangeability and also the ability to measure low flows. Body designs are adaptable and are produced for specified flowrate ranges and maximum service pressure requirements. Designs are available from 10 to 2068 bar+ in screwed, hub connection or wafer styles for flange fitting as appropriate. For maximum security, welds are avoided in our meter designs.
Pelton Wheel Turbine Ring Assembly |
A single turbine ring size is common to all Litre Meter Pelton Wheel flowmeters. It is removable via the top cap of the meter while the meter body can remain undisturbed in the line.
The turbine rotor is based on a highly efficient 'Pelton Wheel' design. The flow into the Pelton wheel is directed 'offset' to one side of the wheel. The flow travels with the rotation of the wheel through 180° imparting maximum drive. This principle also applies to the orifice/bypass MM Series. In addition, features such as low friction bearings and a 'no-drag' rotor motion sensing system result in a meter offering a wide dynamic flow range with linear output.
Our BASEEFA certified EEx ia IIc T5, Intrinsically Safe sensor can be used to meet exceptionally high pressures. Lloyd's Register have accredited a special version where the Maximum Allowable Working Pressure is 2020 bar (29,290 psi) and certified for -20 to +50°C service. The sensor design testing was to ASME VIII Division 1: 1998 Subsection UG-101(m) at 10,345 barg (150,000 psi).
The flowmeter includes a BASEEFA certified EEx ia IIc T5 pre-amplifier electronics in a IP68 rated naval brass or 316 stainless enclosure. A high resolution, current sinking, pulse output is provided, which is ideal for long cable runs.
Viscosity Effects
Viscosity affects all turbine type meters where any non-linearity characteristic present is magnified and lowest flowrate measurement capability is lost due to viscous drag upon the rotor blades. For these reasons turbine-type meters are not generally selected for chemical injection service as these fluids such as scale inhibitor, corrosion inhibitor etc are mostly viscous. For such applications our alternative positive displacement meters should be used to achieve high accuracy measurement.
Our Products
VFF Rotary Piston
LMX Pelton Wheel
Sierra Mass Gas Flowmeter
Helical Screw