Litre Meter Press Release

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LF05 VFF(3).jpgLitre Meter has shipped 11 low flow flowmeters to Single Buoy Moorings (SBM) for use in chemical injection on a floating production storage and offloading (FPSO) vessel. The ship is contracted to Petrobras for use on the Baleia Azul field located off the coast of Brazil in the Campos Basin.

The customised LF05 VFF meters were designed to measure the flow of scale inhibitor.

Each meter is calibrated for low flow at 20l/h with a viscosity of 27 centipoise. Each meter is pressure rated to 414 bar and fitted with 1/2-inch US standard national pipe thread taper (NPT) threaded connections.

The meters are constructed of 316 stainless steel with titanium rotors. The low flow capability of the meters has been improved by coating the pressure balance chambers and titanium rotors with physical vapour deposition (PVD) designed to lower the friction properties of the meters to extend their ability to measure low flows. The additional hardness provided by the PVD coating also improves wear resistance.

All the LF05 meters were supplied with separate, panel-mounted displays showing flow rate and total with HART or Fieldbus protocols on a three-wire system mounted in an ATEX Exd stainless steel housing.

The formation of inorganic salts such as calcium carbonate, calcium sulphate or iron oxide during oil and gas production, known as ‘scale’, is a major flow assurance problem. Scale forms and deposits under supersaturated conditions, wherever the mixing of formation water from the bottom hole and injected seawater takes place. The deposited scale sticks to surfaces of the producing well tubing and on parts of water handling equipment, where it builds up in time and leads to problems in reservoirs, pumps, valves and topside facilities.

Scaling also takes place in heat transfer equipment such as boilers and heat exchangers, affecting performance during the heat exchange and lowering flow rates. A rapid increase of the mineral deposits leads to inevitable damage of the equipment parts. As a consequence, suspension of oil operations is necessary for the recovery or replacement of damaged parts. In the oil field these interruptions are accompanied by extremely high costs.

Corrosion and the loss of metal can occur anywhere in the production system from the bottom hole to surface lines and equipment. Chemicals are injected into the system to prevent these problems – and the Litre Meter LF05 flowmeters are used to precisely measure the amount of chemical being added. This ensures that the correct amount of chemical is used, reducing waste and the cost of removal.

Litre Meter CEO Charles Wemyss said: “Subsea repairs and the associated loss of production are high cost, so protecting deepwater well bores from hydrate formation, plugging and organic fouling is a major flow assurance concern in offshore operations.

“Scale and corrosion prevention strategies provide protection during normal operation, start-up and shutdown.

“Litre Meter’s VFF flowmeter is ideally suited for use in the oil and gas industry and in particular for low flow / high pressure applications.

“Years of experience in chemical injection applications onshore and offshore have confirmed the instrument’s capability to reliably measure fluids under extreme conditions of both temperature and pressure.”