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Rosemount™ 3818 Eight - Path Liquid Ultrasonic Flow Meter for LNG
Rosemount 3818 Liquid Ultrasonic Flow Meter
Dynamically measure LNG with greater accuracy and stability than static measurement methods with the fully-redundant, dual four-path Rosemount 3818 Liquid Ultrasonic Flow Meter.
The unique multi-plane, interlocked British Gas meter design ensures increased flow capacity and virtually no incremental pressure drop with factory-proven linearity within ±0.15% and a meter factor uncertainty of ±0.027% to ensure the highest measurement integrity. The meter is equipped with powerful Rosemount 3810 Series Electronics that generate a wealth of real-time predictive diagnostics to help operators rapidly identify process upsets to minimize measurement uncertainty.
Rosemount™ 3818 Eight - Path Liquid Ultrasonic Flow Meter for LNG

Specs

Line Sizes
DN200 to DN900 (8-in to 36-in)
Fluid Type
Liquified natural gas (LNG)
Linearity
±0.15% of measured value over a 1.2 to 12.2 m/s (4 to 40 ft/s) range or ±0.20% of measured value over a 0.6 to 12.2 m/s (2 to 40 ft/s) range (optional)
Uncertainty of Meter Factor
<±0.027% (API MPMS, Chapter 5, Section 8, Table B-1)
Velocity
0.6 to 12.2 m/s (2 to 40 ft/s) with an extended range of 0.3 to 14.6 m/s (1 to 48 ft/s)
Temperature Range
Transducers: -196°C to +60°C (-385°F to +140°F)
Electronics (ambient): -40°C to +60°C (-40°F to +140°F)
Pressure Range
0 to 250 Bar (0 to 3,600 psig)
Specific Gravity Range
0.35 and higher (nominal 0.45)
Materials
Carbon steel and stainless steel
Calibration
Conducted in Emerson’s ISO 17025 certified flow calibration laboratory

Features

  • Maximize measurement integrity with factory-proven linearity within ±0.15% and less than ±0.027% meter factor uncertainty
  • Avoid measurement issues with built-in diagnostics that track LNG quality, process conditions and flow integrity
  • Expedite tanker loading and offloading at high-volume LNG transfer operations with larger line size meters
  • Minimize maintenance time, cost and the risk of LNG flashing with a full-bore body that has no moving parts
  • Reduce compression costs and increase operational efficiencies by virtually eliminating pressure drop
  • Rely on calibration via static zero flow and full dynamic testing conducted in our ISO 17025-certified facility
  • Increase I/O with new Type 4 CPU Module with up to six frequency or digital outputs