Our case studies


Nominal volume flow measurements in offshore operations on production platforms

  • Volume flow, temperature and pressure measurements with a measuring device
  • Simple installation with 2-wire connection technology
  • Problem-free replacement for previously deployed measuring devices

Flow measurements for sample dosing in process analyzers for the petrochemical industry

  • Dosing highly viscous products with no electrical conductivity
  • Flow monitoring to detect leaks and blockages
  • Precision dosing of sample flow using an integrated needle valve


List of projects
Enbridge Gas Distribution Inc
Energy – Gas distribution
Natural gas compressor station
Lambton County, Ontario, Canada
OPTISONIC 6300 Clamp-On


Enbridge Gas Distribution is Canada’s largest natural gas distribution utility, providing service to approx. 1.8 million residential, commercial, and industrial customers in Ontario.

Natural gas compressor station with glycol dehydrator:

Natural gas is moved through a pipeline under pressure, to keep the natural gas moving at the desired rate. The pressurization is done at compressor stations that are located along a natural gas pipeline. The processes that take place at the compressor stations are gas compression (which causes the gas to heat up), gas cooling (which causes the water contained to become instable and liable to condense in the pipeline) and gas dehydration (to remove the water before it enters the ensuing pipeline).

For the main dehydration of the natural gas, a liquid separator is used, consisting of scrubbers and filters to capture liquids or other undesirable particles from the natural gas. The remaining water is removed from the natural gas stream by counter-current contact with a recirculation system that is filled with glycol. Through this contact, the natural gas gives up its water vapour to the glycol. The glycol in turn is circulated in a closed system, where the water is boiled off from the glycol. The regenerated glycol is then is used again.

Measurement requirements

Since glycol is expensive and has to be discarded as a special chemical, they need a means of measuring glycol accurately without direct contact.

KROHNE EMAS solution

  • KROHNE clamp-on ultrasonic flow meter: OPTISONIC 6300
  • Two OPTISONIC 6300 are installed on 2-inch steel pipes measuring the flow rate of glycol running through. The flow rate of glycol is matched with the flow rate of the natural gas. By doing this a reasonable estimate can be made of the amount of water left in the gas stream leaving the dehydrator. The required accuracy is 1 to 3%.

Customer benefits

KROHNE EMAS’s Clamp on ultrasonic flow meter is seen as the ideal solution:

  • No need to shut down the process for the installation
  • No risk of glycol leaks (possibly toxic)
  • Cost effective
  • Glycol is non–conductive
  • Ensures flow rate is constant for pump protection
  • Customer has not yet commissioned the system