Description

Flow measurement of dissipated gaseous oxygen (GOX) or nitrogen (GAN)

Requirements

  • Low pressure loss

Description

Flow measurement of cooling water

Requirements

  • Accurate flow measurement in big line size

Description

Pressure measurement of the supplied air by means of pressure transmitter

Requirements

  • Intake air pressure measurement for compressor protection

Description

Integrated control valve with flow, pressure and temperature measurement of cooling water

Requirements

  • Local independent flow control

Description

Measurement of chlorine in the cooling water flow from cryogenic distillation

Requirements

  • Robust measuring probe

Description

Pressure measurement following air compression

Requirements

  • Process control
  • Monitoring of compressor

Description

Flow measurement in the pre-cooler

Requirements

  • Direct output of nominal flow and energy transferred

Description

Flow measurement of the compressed air

Requirements

  • Determination of Free Air Delivery (FAD)

Description

Variable area flow measurement in the compressed air in the purge panel

Requirements

  • Sturdy design made of stainless steel
  • Compact mechanical indicator incl. needle valve

Description

Differential pressure measurement of nitrogen at inlet/outlet of pre-cooler

Requirements

  • Monitoring of pre-cooler condition

Description

Differential pressure monitoring of filter

Requirements

  • Filter monitoring

Description

Nitrogen flow measurement

Requirements

  • Flow control
  • Both, density and volume flow of nitrogen

Description

(Differential) pressure measurement of cryogenic counterflow distillation

Requirements

  • Process monitoring

Description

Head pressure measurement of air separation unit

Requirements

  • Control of air separation process

Description

Flow measurement of cryogenic, liquid nitrogen, in distillation

Requirements

  • Weld-in version
  • Potted junction box IP68

Description

Pressure measurement in liquid nitrogen/oxygen tanks

Requirements

  • Pressure supervision storage tanks

Description

Combined level measurement (magnetic, radar) in liquid nitrogen/oxygen

Requirements

  • Combined FMCW RADAR and displacer level transmitter
  • Thermal insulation for high/low temperatures

Description

Variable area flow measurement on purge panels

Requirements

  • Pre-assembled and tailor-made
  • Including piping and acceptacne tests

Description

Flow measurement of distributed liquid nitrogen, oxygen, argon

Requirements

  • Approvals for oxygen
  • Installation even in filling end-position

Overview

Air separation unit in the industrial gases process

Precision instrumentation for accurate monitoring of cryogenic processes

Gases such as oxygen and nitrogen are also used in high volumes in liquefied form in industry, medicine and the food sector. The most widely used industrial process for liquefying gas goes back to the established Linde process. In the first stage, air is liquefied in the cryogenic air separation unit. To this end, ambient air is drawn in through a filter, compressed and traces of carbon dioxide, hydrocarbons and water vapour are separated in absorbers. The heat produced is then dissipated through pre-cooling with water. In the downstream expansion in the low temperature part of the plant (cold box), the end temperature of the air falls below the ambient temperature. Already expanded gas flows result in further cooling of the compressed air to liquid form in a heat exchange process. Because of the various pressurisation levels and the extremely low temperatures, the different boiling points of the individual air components oxygen (-183 °C), nitrogen (-196 °C) and argon can be approached, and thus separation is possible in a multistage process of the following distillation column (rectification) by means of counterflow distillation. Depending on the type of air separation unit, the end products are transported to the customer in product tanks as liquefied gases or by pipeline as gases.

Safe and reliable operation of an air separation unit requires monitoring ­ and measuring equipment for process parameters that can withstand extremely low temperatures. Specially equipped measuring devices can even withstand the condensation of water from moist air. In addition, highest purity is important for the end products. KROHNE has a wide range of sophisticated measuring equipment – for example for level, flow and (differential) pressure measurement - especially for cryogenic media. These devices maintain their metrological availability, even with a gas content of the liquefied gases of up to 100%. And thanks to our innovative ultrasonic flowmeters with integrated temperature and pressure sensors, the measured volume flow – whether gaseous or liquid – can always be converted to standard conditions. We also have a range of variable area flowmeters for the reliable measurement of all air products, for example in analysis. These can even fulfil the maximum requirements ex-works, for example by X-ray weld inspection or helium leak testing.

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